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Epson -- FX-850 -

1. 4 5 4 2 1 Upper Case Removal eene 4 7 4 2 2 Control Panel Removal wii 4 8 4 2 3 Push Tractor Unit 4 8 4 2 4 Circuit Board Removal 4 4444 4 9 4 2 4 4 PEGX Board Removal 4 9 4 2 4 2 Board Removal 4 11 4 2 5 Printer Mechanism Disassembly 4 12 4 2 5 1 Printer Mechanism Removal 4 13 4 2 5 2 Printhead Removal 4 14 0 4 2 5 3 FPC Flexible Printed Cable Removal 4 15 4 2 5 4 Carriage Motor Removal 4 16 lt x 4 2 5 5 Timing Belt Belt Driven Pulley Removal 4 18 T 4 2 5 6 Position Sensor 4 19 4 2 5 7 Paper Feed Motor Transmssion Gears Removal esses ll 20 4 2 5 8 Friction Tractor Sensor Removal 4 21 4 2 5 9 Plunger Removal 4 22 4 2 5 10 Platen Unit 4 23 4 2 5 11 Paper Release Lever 4 24 4 2 5 12 Main and Base Frame 4 25 4 2 5 13 Ribbon Driver Unit Removal 4 28 4 2 5 14 Carriage Removal
2. 2 49 Table 2 11 2 2 phase Excitation 2 55 2 iii REV A REV A Table 2 12 Paper Feed Motor Speed 2 55 i Table 2 13 Paper Feed Direction and Operation mn 2 55 Table 2 14 Acceleration Deceleration Mode 2 56 Table 2 15 Relationship Between GA Ports and Plunger Voltage seem 259 gro ty REV A 2 1 GENERAL This chapter describes the operation of each component Section 2 2 and the subsequent sections give more detailed descriptions of each component 2 1 1 Cable Connections The printer components are connected to and controlled by the PEGX board Figure 2 1 shows the interconnection of the components Model 3B10 3B60 Poper Print Plunger Home PE feed Corrioge Release heod position motor motor switch 12pin 2pin 5 PEGX board pt Mos l entes Panel PEGFLU board 120V 220 240V AC120V AC220V AC240V Host computer Figure 2 1 Cable Connections 2 1 REV A Each component is connected to one of the connectors on the PEGX board which are listed in Table 2 1 Table 2 1 describes the connectors Circuit Board PEGX board Connector Number CN 1 CN2 CN3 CN4 CNS CN6 CN7 CN8 CN9 CN 10 CN 11
3. 1 2 Table 1 3 Line Feed 5 1 4 Table 1 4 Cut Sheet Paper Specified 14 Table 1 5 Fanfold Paper Specified Conditions 1 5 Table 1 6 Roll Paper 1 5 Table 1 7 Envelope Specifications 1 5 Table 1 8 Label Specification 1 6 Table 1 9 Lever Adjustment sse 1 8 Table 1 10 Ribbon Cartridge 1 8 Table 1 11 Dimensions and 1 9 Table 1 12 Electrical Specifications 1 9 Table 1 13 Environmental Conditions seen 1 9 Table 1 14 Pint 5 ce Hat e hA VI 140 Table 1 15 Print Columns 0 4 ded Table 1 16 Character Size and Pitch 1 11 Table 1 17 Connector Pin Assignments and Signal Functions ocr 1 14 Table 1 18 Printer Select Deselect Control 1 16 TU Table1 19 DIP Switch1 05 147 Table 1 20 International Character 1 18
4. 2 23 2 3 2 8 12V DC Supply Circuit 2 25 2 3 2 9 Vx Voltage Supply Circuit 2 26 2 3 8 Main IC Function oo meme 2 27 2 3 3 1 CPU Functions oie 2 27 2 3 3 2 E05A15HA Gate Array Functions 2 29 2 3 3 3 E05A16GA Gate Array Functions 2 31 2 3 4 Main Circuit Operation 0 2 00 2 2 2 33 2 3 4 1 Reset Circuit 0 2 33 2 3 4 2 Interface Control Circuit 2 34 2 3 4 3 DIP Switch Circuit and Jumpers 2 37 2 3 4 4 Memory Back up Circuit 2 38 2 i REV A 2 3 4 5 Printer Error 2 39 f 2 3 5 Printer Mechanism 2 41 2 3 5 1 Carriage Control 2 41 2 3 5 2 Carriage Motor Software Control 2 49 2 3 5 3 Paper Feed Control Circuit nne 2 53 2 3 5 4 Plunger Drive 2 58 2 3 5 5 Printhead Control Circuit 2 60 LIST OF FIGURES Figure 2 1 Cable Connections oi 2 1 Figure 2 2 Print Mechanism Block Diagram 2 3 SE Figure 2 3 Printhead Mechanism oss 2 4 m Figure 2 4 Carriage Mechanism ees 2 5
5. 4 9 Figure 4 12 PEGX Board Removal 9710 Figure 4 13 PEBFIL II Board Removal me 4 11 Figure 4 14 Printer Mechanism s Component Relationship 4 12 Figure 4 15 Printer Mechanism Removal 4 13 Figure 4 16 Ground Plates Removal winced 4 14 Figure 4 17 Printhead Removal wun 4 14 Figure 4 18 Disconnecting FPC uci 4 15 Figure 4 19 FPPC Removal wn 4715 Figure 4 20 Carriage Motor 1 4 16 Figure 4 21 Carriage Motor Removal 2 4 16 Figure 4 22 Timing Belt Removal eee 4718 Figure 4 23 Timing Belt Insertion ees 2718 Figure 4 24 Home Position Sensor Removal 4 19 Figure 4 25 Paper Feed Motor Removal 4444 4 20 Figure 4 26 Transmission Gears 4 20 Figure 4 27 Friction Tractor Sensor 4 21 Figure 4 28 Plunger 122222 4 22 Figure 4 29 Plunger Positioning semen 4 22 Figure 4 30 Platen Cover 4 23 Figure 4 31 Platen Removal mmm 4 23 Figure 4 32 Paper Release Lever Removal
6. 4 24 Figure 4 33 Wire Clamp 5 0 6 4 4 4 25 ce qute REV A Figure 4 34 Cable Positions on the Base Frame eee 4 25 Figure 4 35 Side Frame Screws 4 26 Figure 4 36 Printer Mechanism Separation 4 26 Figure 4 37 Main Frame Unit eene 4 27 Figure 4 38 Base Frame Unit oes 4 27 Figure 4 39 Ribbon Driver Unit Removal enn 8 et enenenes 4 28 Figure 4 40 Carriage 1 2 2 4 29 Figure 4 41 Carriage Guide Shafts and Removal 4 30 Figure 4 42 LS and Parallel Adjustment Bush Removal 4 30 Figure 4 43 Positional Relationship Between Paper Guide Plate and Paper Guide Plate 5 4 31 Figure 4 44 Paper Guide Plate and Paper Feed Roller Unit Relationshlp iini tiet cric elit 4 31 Figure 4 45 Paper Feed Roller Unit Removal 4 32 Figure 4 46 Paper End Sensor Removal 4 32 Figure 4 47 Paper Holding Roller Shaft Removal 4 33 Figure 4 48 Paper Holding Roller Lever R 4 33 Figure 4 49 Paper Holding Roller Lever L 4 34 Figure 4 50 Tractor
7. 6 6 ac Lid lt I REV A 6 1 PREVENTIVE MAINTENANCE Proper maintenance is essential to maintain optimal printer performance for the longest possible period and to minimize malfunction frequency Preventive maintenance includes regular cleaning of the case exterior using alcohol and occasional vacuuming of the mechanism interior to remove dust and paper particles Following cleaning refer to Section 6 2 to verify that the unit is adequately lubricated Before returning the serviced printer to the consumer inspect the springs paper feed rollers and the basic operation of the unit WARNING Disconnect the printer from the power supply before performing maintenance Do not use thinner trichloroethylene or ketone based solvents on the plastic components of the printer 6 2 LUBRICATION AND ADHESIVE APPLICATION EPSON recommends that the points illustrated in Figure 6 2 be lubricated according to the schedule listed in Table 6 2 with EPSON O 2 and G 27 which have been extensively tested and found to comply with the need of this printer Refer to Table 6 1 for details of O 2 and G 27 Be sure that the parts to be lubricated are clean before applying lubricant and avoid excessive application which may damage related parts Adhesive application is necessary at the point indicated in Table 6 3 when the part is disassembled or replaced EPSON recommends Neji lock 42 G adhesive be applie
8. A 8 Figure 8 EO5A16GA Pin Diagram A 13 Figure 9 GA E05A16GA Internal Block A 14 Figure A 10 HM27256G 25 Pin Diagram 19 Figure 1 1 HM27256G 25EP ROM Block 19 Figure 1 2 HM264ALSP 12 Pin Diagram 21 Figure 1 3 HM6264ALSP 12 Block Diagram A 21 Figure A 14 NJM2355 Internal Circuit A 23 Figure 1 5 STK6722H Pin Diagram A 24 gt lt Figure 1 6 STK6722H Internal Circuit A 24 z Figure 1 7 PGPNL Board Circuit Diagram A 26 Figure 18 PEGX Board Circuit Diagram A 27 Figure 19 PEGX Board Component Layout A 29 lt Figure 20 FX 850 Exploded Diagram 1 A 30 Figure A 21 FX 850 Exploded Diagram 2 A 31 Figure A 22 FX 850 Exploded Diagram 3 A 32 Figure A 23 FX 1050 Exploded Diagram 1 A 34 1 REV A Figure Fi
9. nme 5 1 Figure 5 2 System Overview oo 5 2 Figure 5 3 Initial Screen 1 1 3 5 3 Figure 5 4 Menu Screen Mode Screen 5 4 Figure 5 5 Manual Mode Menu Screen 5 4 Figure 5 6 Question Screen Example 5 5 Figure 5 7 RAM and CPU Check wince 5 7 LIST FO TABLES Table 5 1 Troubleshooting Tools wi 5 1 Table 5 2 Off Line Diagnostics een 5 8 Table 5 3 Unit Parts Eisen re rer veio aec s 5 9 Table 5 4 Symptom and Reference Pages 5 10 Table 5 5 Power Supply Circuit Parts List 5 17 Table 5 6 Power Supply Circuit Unit Repair 5 18 Table 5 7 Control Circuit Parts List 5 20 Table 5 8 Electric Device List 5 20 REV A 5 1 GENERAL Because various types of trouble can occur troubleshooting is not easy to perform Here a simple procedure is provided to perform troubleshooting as shown in Figure 5 1 START Refer to section 5 2 Refer to section 5 3 Fault check using the diagnostic tool Unit Replacement Refer to section 5 3 1 Printer Mechanism Power supply circuit p
10. 6 7 8 9 and CN10 from the PEG xX board Refer to Figure 4 1 O Step 4 For the FX 850 remove the three screws or for the FX 1 050 remove the four screws CPS O 8 X 6 which attach the ground plates to base frame Step 5 For the FX 850 remove the four screws or for the 105 remove the five screws CBB 0 4 X 25 securing the printer mechanism to the lower case CPS O 3X 6 LET PID CBB P 4X 25 Figure 4 15 Printer Mechanism Removal 4 13 REV A Step 6 Remove the printer mechanism from the lower case E CPS O 3 x 6 Base Frame Ground Plate Figure 4 16 Ground Plates Removal 4 2 5 2 Printhead Removal Step 1 Remove the printer cover Step 2 Remove the ribbon cartridge Step 3 Move the head lock levers to the outside Step 4 Shift the printhead slightly toward the platen side 1 pull it upward 2 slide it to the right and 3 remove from the carriage gU 4 d Figure 4 17 Printhead Removal 4 14 REV A Step 5 Disconnect the flexible printed cable FPC from the connector at the printhead Printhead FPc Connector Figure 4 18 Disconnecting FPC 4 2 5 3 FPC Flexible Printed Cable Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the printhead Refer to Section 4 2 5 2 Step 3 Remove the FPC at the bottom of the base frame Step 4 Press the two tabs for the head cable guide at the bottom of the
11. CT 983 rN sz 2233 3323i5ii cs a ie AL 2 cue woaw EOSAIGGA 8 eC TD 20 pn Figure A 19 PEGX Board Component Layout c32 4b A 29 D E CS N sc 3 81 t 2 3 vL ds 118 9 REV A REV A ERN 320 without 122 Figure A 20 FX 850 Exploded Diagram 1 A 30 REV A 583 Us 561 6 sza gt Ds e Figure A 21 FX 850 Exploded Diagram 2 A 3 1 REV A Figure A 22 FX 850 Exploded Diagram 3 A 32 REV A Table A 26 FX 850 Parts Name Reference Description LOWER CASE PRINTER COVER A PRINTER COVER B SHEET GUIDE COVER SHEET GUIDE ASSEMBLY BASE PLATE UPPER CASE SIDE COVER LOGO PLATE GROUND PIATE PLATEN KNOB SHIELD PLATE RUBBER FOOT C B B SCREW M3X8 C B B SCREW M3x 10 C B B SCREW M4 X 12 C B B SCREW M4 X 12 C B B P SCREW 4 X 25 C P S 0 SCREW M3X6 C B SCREW M4X8 5 0 SCREW M4X8 C B P SCREW M3 X 8 PEGX BOARD UNIT HEAT SINKER M38 1 010 HEAT SINKER M395 050 INSULATOR M38 1 020 TRANSISTOR HOLDER M903 1080 5 SCREW M3x 12 C C S SCREW M3x 16 C C S SCREW M3x 10 PEBFIL II BOARD UNIT 120V FUSE 125V 2A PEBFIL II BOARD UNIT 220V 240V FUSE 250V 1 25A PEBFIL II BOARD UNIT 100V FUSE 125V 2A POWER TRANSFORMER 120V POWER TRANSFORMER 220V POWER TRANSFORMER 240V POWER CABLE 220V POWER CABL
12. Figure 4 6 Printer Disassembly Procedures 4 5 REV A Screws washers nuts etc are abbreviated using the conventions below Abbreviation CBB CTBB CBS CTBS CBS 0 0 CBNS CTBS CPS 0 CTPS 0 CPS P CTPS CTB 0 HNO RE PW LS Table 4 4 Abbreviations List of Small Parts Part Name Cross Bind head B tight Cross Bind head S tight Cross Bind head S tight with Outside toothed washer Cross Bind Notch head S tight Cross Pan head S tight with Outside toothed washer Cross Pan head S tight with Plain washer Cross Truss head B tight with Outside toothed washer Hexagon Nut with Outside toothed lock washer Retaining E ring Plain Washer Leaf Spring E Table 4 5 illustrates the relationship between a screw s physical characteristics and its abbreviated part name Table 4 5 Form and Abbreviated Part Name of Screws washer Head assembled Cross recessed head 1 Bind 222300 ee gt 2 Tap tight Stight SLotted head with Notch 2 Outside toothed Co lock washer e 2 Pan Btight 3 Tapping 3 Spring washer uD O U T REV A 4 2 1 Upper Case Removal To check the interior of this printer first remove the upper case using the steps listed in the paragraphs below DANGER Prior to beginning the following procedures be sure
13. START s connector CN11 between the control pane Ond the PEGX boord No connected correctly Reinsert connector 1 1 correctly s the fault corrected Is the self test executed normally Reploce the PEGX board Replace the control panel Is the foult corrected Is the foult corrected Replace the PEG boord the PEGX boord No REV A 6 The printing is incorrect in the ON LINE mode f NOTE It is assumed that the host computer operates normally START Perform test printing No Refer 1o other troubleshooting items Serial RS 232C 15 printing normal Yes Do the transmission conditions match Which No Interface 15 being used Confirm the transmission conditions of the printer ond the host computer Porallel Match the transmission condition Replace the connection cable from the host computer Is the No foult corrected Y Replace the PEGX board Replace the PEGX board REV A 5 4 UNIT REPAIR Unit repair is comprised of three parts 1 repair of the power supply circuit 2 repair of the control circuit 3 repair of the printer mechanism This section describes 1 power supply circuit unit repair If 2 control circuit or 3 printer mechanism need repair use the diagnostic tool introduced in Section 5 2 5 4 1 Power Supply Circuit This s
14. 29 4 2 5 15 Paper Guide Plate Removal 4 31 4 2 5 16 Paper Feed Roller Unit 4 32 4 2 5 17 Paper End Sensor Removal 4 32 4 2 5 18 Paper Holding Roller Set and Paper Holding Levers Land 4 33 4 2 5 19 Push Tractor Unit 4 35 4 2 5 20 Paper Tension Unit 4 36 4 3 ADJUSTMENT ish in erg e RE CU 4 37 4 3 1 Platen Gap Adjustment ries 4 37 REV A 4 3 2 Paper Feed Motor Gear Backlash Adjustment 4 40 4 3 3 Bi Directional Print Alignment Adjustment 4 41 LIST OF FIGURES Figure 4 1 Parts of the FX 850 1050 4 2 Figure 4 2 Ribbon Cartridge and Platen Knob Removal 4 3 Figure 4 3 Transport Locking Brackets Installation 4 3 Figure 4 4 Locking Tabs Installation oi 4 4 Figure 4 5 PrintheadProtector 44 Figure 4 6 Printer Disassemlby 4 5 Figure 4 7 Upper Case Removal senes Ae Figure 4 8 Control Panel Removal eed 4 8 Figure 4 9 Push Tractor Unit Removal eee eme 4 8 Figure 4 10 Connectors Removal eee 4 9 Figure 4 11 Shield Plate Removal
15. MF1281 Default character ROM 1 1 OFF Shape of zero o Unslashed 1 2 OFF CG Table Italics 1 3 OFF Protocol mode ESC P 1 4 OFF Automatic tear off Valid 1 5 OFF Country U S A 1 6 1 7 ON 1 5 Fage Length 11 inch 2 1 OFF CSF Mode Invalid 2 2 OFF Skip Perforation None 2 2 OFF Auto LF Depend on I F 2 4 OFF Input Buffer Valid n 0 224 RATA Gee gt ABCD FGHIJKLMNOPORS TUVWXYZE _ abcdefghijklmnopqrstuvwx 01234567894 lt gt GABCDEFGHIJ KLMNOPQRSTU VWXYZ r abcdefghijklmmnopqrstuvwxy S amp 0123456789 2 0 227 GABC DEFGHIJKLMNOPGRSTUVMWXYZEN abcde fghijkImnoparstuvwxyZz 28 0123488789 lt lt ABCDEFGHIJKLMNOPORSTUVUXYZ N abcdefghijklmn Opqrstuvwxy zt 4 amp QX 7 0122456789 545 72 P ABCDE F GHIJELMNOPOQRSTUVWXYZE _ abcdetf ghiiklmnoparstuvwxyz 9 X amp QX 01224567 89 05 20 eap DEEFGHIJKL MN QPORSTUVUXYZCN abcdefghijkImnopqrstuvwxyzti R OX x 0123456789 5 7 GAEBCDEFGHIJKLMNOFORSTUVWXYZ N abcdefghijklmnoparstuvwxyz l OX4 7 01234567 lt gt 2 0 gt P ABCDEFGHIUKLMNOFORSTUVWXYZ _ abcdefghijklmnopaqrstuvwxy 2077 0 0125456789 GABCDEFGHIJKL MNOFGRSTUVWXYZ N abcdefghijklmnopar stuvwxyzi 0122456789 72 GABCDEF GHIJKLMNOFGRSTUVUXYZ N abcdefghijklmnoparstuvwxy 2007 Draft Mode I X amp 0 7 0123456788 76ABCDEFGHIJK LANOPQRSTUVWXYZ N1 _abcdefghijklmnopgrstuvwx k 0
16. 2 3 4 Main Circuit Operation All the printer operations are controlled by the PEGX board The printer control can be divided into two sections the main control for the host computer interface printer initialization memory control analog signal detection and reading the DIP switch settings and error detection and mechanism control for driving the printer mechanisms such as the carriage motor paper feed motor plunger and printhead This section describes the operation of the following Reset Circuit Interface Control Circuit Memory Back up Circuit Error Detection 2 3 4 1 Reset Circuit The printer is reset when any of the following occur printer power is turned on hardware initialization initialization signal INIT is received from the host computer hardware initialization Control code ESC is received from the host computer software initialization The reset operation performed for the ESC code is different from that for the other two cases Figure 2 27 shows the reset circuit GA EO5E 16GA 7A RSTIN2 R80 IK ST RAM 6A CS2 Figure 2 27 Reset Circuit Refer to Section 1 7 for information on hardware and software initialization REV A ty 2 3 4 2 Interface Control Circuit Parallel data communication between the printer and host computer is controlled by the gate array 7 16GA on the PEGX board Figure 2 28 shows the interface control circuit block
17. Figure 2 5 Ribbon Feed Mechanism ue 2 6 Figure 2 6 Push Tractor Feeding Method 2 8 Figure 2 7 Friction Feeding Method 2 9 Figure 2 8 Power Supply Block 2 10 Figure 2 9 Control Circuit Block Diagram 2 12 Figure 2 10 Memory Mapping ou cree 2 14 Figure 2 11 PEBFIL II Filter Circuit Board 2 16 Figure 2 12 Transformer Circuit 2 16 Figure 2 13 Rectifier and Smoothing Circuit 2 17 Figure 2 14 Step Down Circuit seme 2 18 Figure 2 15 Step Down Timings on eem 2 18 T Figure 2 16 NJ M2355 Internal Circuit e 2 19 Figure 2 17 Output Transistor Drive Waveform 2 20 Figure 2 18 5V Regulator Circuit 2 eee 2 21 Figure 2 19 Oscillator Waveform sessi 2 21 Figure 2 20 Constant Voltage Control 5V DC 2 22 Figure 2 21 1 Output 2 2 2 lt 2 22 Figure 2 22 24V Regulator Circuit 0 2 400004 2 2 2 23 Figure 2 23 Constant Voltage Control 24V 2 24 Figure 2 24 Over Current Protection OCP 2 24 Figure 2 25 12
18. After insertion apply adhesive at the engaged parts of the carriage and the belt Refer to Section 6 2 Lubrication and Adhesive Application Insert the belt until the undersurfaces of the belt mesh with the inserted parts of the carriage 3 Hang the timing belt tension spring on hooks for both base frame and carriage motor mounting plate 4 Tighten the screws on the carriage motor mounting plate PN 4 2 5 6 1 2 3 4 REV A Home Position Sensor Removal Remove the printer mechanism Refer to Section 4 2 5 1 Press the two tabs of the home position sensor on the bottom of the base frame Remove the home position sensor Disconnect the connector from the home position sensor Home Position Sensor Connector a Bottom View b Top View Figure 4 24 Home Position Sensor Removal 4 19 REV A 4 2 5 7 Paper Feed Motor Transmission Gears Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the two CPS O 3 X 6 screws Step 3 Remove the paper feed motor Carriage Motor CPS O 3X 6 Figure 4 25 Paper Feed Motor Removal Step 4 Remove the tractor transmission gear spring Step 5 Remove the paper feed transmission gear Step 6 Remove the PW 5 2 X 0 3 X 10 and tractor transmission gear Tractor Transmission Gear Pw 5 2 X 0 3 X 10 Dd Figure 4 26 Transmission Gears Removal ADJUSTM
19. Bi Directional Print Alignment Adjustment Sequence cent d 4 42 REV A Press LINE FEED switch ee 4 un 1 Figure B Bi Directional Printing Sample Execute the Speed Mode 5 print operation Print Alignment OK Adjust the bi direction print alignment by the following Press FORM FEED switch control panel operation CONDENSED right shift END LOAD EJECT left shift increase Press LINE FEED switch Figure 4 58 Bi Directional Print Alignment Adjustment Sequence cent d 4 43 REV A CHAPTER 5 TROUBLESHOOTING GENERAL DOR a 5 2 DIAGNOSTIC OOL itus 5 21 PDOS System Feature 5 2 5 22 System Overview cuente aia id bir 5 2 5 2 3 How to Select The Host Computer e 5 3 5 2 4 System Activation occ 973 5 2 5 Mode Selection een 54 5 2 6 PDOS for RAM and CPU Check eee 5 7 5 2 77 Programmer TIPS nice trie tee remi reet cer cb 5 8 5 3 UNIT REPLACEMENT _ nne 5 9 5 4 UNIT REPAIR usce tet A bett 9 17 5 4 1 Power Supply Circuit eme 9 17 5 4 2 Control Circuit 5 5 eerte er erc 5 20 5 4 3 Model 3B10 3B60 Printer 5 20 LIST OF FIGURES Figure 5 1 Troubleshooting Procedure
20. DC3 HIGH DC 1 HIGH During data entry LOW HIGH During data entry LOW HIGH During data entry LOW HIGH During data entry after entry Pulse output after entry Pulse output after entry Pulse output after entry mal Process NOTES 1 In the Table 1 18 it is assumed that no ERROR status exists other than that attributable to OFF LINE mode 2 Once the printer is deselected by the DC3 code the printer will not revert the selected state unless the DC 1 code is input again In the deselected state the printer ignores input data until the DC 1 code is received 3 The DC 1 and DC3 codes are enabled only when the SLCT IN signal Input Connector No 36 for the parallel interface unit is HIGH and printer power is initialized 4 If the SLCT IN signal is LOW when the printer is initialized DC 1 DC3 printer select deselect control is invalidated and these control codes are ignored 5 If the SLCT IN signal is HIGH and is not set to LOW by jumper 6 when printer initialized the printer starts from the selected DC 1 state 1 16 Enable Waits DC1 See Note 2 Enable Nor asi mal Process 7 REV A 1 4 DIP SWITCHES AND JUMPER SETTINGS This section describes the DIP switch selections and jumper setting for the FX 850 1 050 printer 1 4 4 DIP Switch Settings The DIP switches are located at the right side of the printer When the printer hardware is initialized the
21. EPSON AUSTRALIA PTY LTD Unit 3 17 Rodborough Road Frenchs Forest NSW 2086 Australia Phone 02 452 5222 Telex 75052 EPSON ELECTRONICS SINGAPORE PTE LTD No 1 Raffles Place 26 00 Oub Centre Singapore 0104 Phone 5330477 Telex 39536 EPSON ELECTRONICS TRADING LTD 25 F Harbour Centre 25 Harbour Road Wanchai Hong Kong Phone 5 8314600 Telex 65542 EPSON ELECTRONICS TRADING LTD TAIWAN BRANCH 10F No 287 Nanking E Road Sec 3 Taipei Taiwan R O C Phone 02 7160855 Telex 24444 EPSON ITALIA S p A Via Timavo 12 20124 Milano Italy Phone 02 6709136 Telex 315132 SEGII EPSON STI S A Paris 152 08036 Barcelona Spain Phone 410 3400 Telex 50129STTK SEIKO EPSON CORPORATION Hirooka Office 80 Harashinden Hirooka Shiojiri shi Nagano ken 399 07 Japan Phone 0263 52 2552 Telex 3342 214 5 5 1987 Dec
22. Electricity leaks when you put the PEGX board on the electric conductor materials The lithium battery on the PEGX board always supply DC voltage to the static RAM 4 2 4 4 PEGX Board Removal Step 1 Remove the upper case Refer to Section 4 2 1 Step 2 Remove the push tractor unit Refer to Section 4 2 3 Step 3 Disconnect connector CN3 which connects the power transformer Step 4 Disconnect connectors CN4 5 CN6 CN7 8 9 and CN 10 which connect the printer mechanism CN5 4 CN8 CN9 CN 10 Figure 4 10 Connectors Removal 4 9 REV A Step 5 Remove the shield plate at the back of the lower case Shield Plate Figure 4 11 Shield Plate Removal Step 6 Remove the two CBS 3 X 10 and 3 X 12 screws securing the PEGX board Step 7 Release four tabs securing the PEGX board Step 8 Remove the PEGX board PEGX Board Figure 4 12 PEGX Board Removal REV A 4 2 4 2 PEBFIL II Board Removal Step 1 Remove the upper case Refer to Section 4 2 1 Step 2 Disconnect connector CN 1 which connects the PEBFIL II board Step 3 Remove grounding screw CPS 0 3 X 6 which secures the PEBFIL II board Step 4 Remove grounding screw CB 0 4 X 8 which secures the A C ground wire CN 1 PEBFIL II Board CB O 4X 8 CPS O 3x 6 Figure 4 13 PEBFIL II Board Removal 4 11 REV A 4 2 5 Printer Mechanism Disassembly This section describes the procedures
23. REV A 0446 9 2 04846 9 gt 4240 8 5 Bo en mo 0 40 8 518 ee 0 43 PORTO PORT C PORT B PORT A PORT F ssa 13S34r3g0wia300Walv TOYLNOD W31SAS 7110OHLNOO 15 7OB81NO2 55 IIAV 33003930 H31H83ANOO ET RED 33HVA 15 mv 91 8 Ke 0 LNV 9 1SNI 102 298 5 msa POLI 002 924 10 999 Ke gt TVNH3INI ee E O ZINU 11 2d J h 4 gt 3148 982 recog YOY 3 174 3148 39 8 O LINI v 79 1 wvubOsd uo o MEE 27174 198 294 v C RN 1 5 OQ u 12d OQ x 1 24 4 7 34 EA Oz x tLe 250 Figure 2 7810 7811 Block Diagram A 3 REV A Table A 3 PD781 Mode Setting Mode 1 Mode O External memory 400 4 1 Note 16K bytes Addresses O to 3FFF 1 Note 1 Note 64K bytes Addresses O to OFFF NOTE Pull up is made Table 4 PD781 1 PF Operation NN ABS AB8 AB 15 AB 14 AB 13 AB 12 AB 11 AB 10 60K bytes max Table A 5 PD781 PF Operation 7 Pre Prs Pra rra Pra PFO Menon o o Pon ron ron men eis ass a88 ac oves mao o eon ron aerz ass 1 15 14 AB
24. REV A 2 3 3 Main IC Functions This section describes the functions of the main ICS in the PEGX board control circuit 2 8 8 4 CPU Functions The printer employs the PD78 10HG CPU The CPU processes data using 3 685 MHz clock which is 1 4 of the external clock 14 74 MHz The CPU is reset when the reset signal pin 28 LOW is input and executes the external program 4A PROM from address O The CPU controls all of the printer operations either directly or indirectly The external memory area is expanded to 64K bytes so that the CPU can control the internal RAM external ROM 4A program and character generator external SRAMS 5A and 6A and the E05A16G and E05A15A gate arrays 7A and NOTE Refer to Section 2 3 1 3 for memory mapping This CPU includes an 8 bit analog to digital converter timer event counter and serial interface These functions can be set in units of bits using the mode register for each port and are used with general 1 0 ports excluding the analog to digital converter Table 2 3 shows the port assignments Refer to the Appendix for details on the CPU Table 2 3 Pin Function of CPU PAO Not used 5 1 6 7 PA N AUTO FEED XT signal DIP switch 2 4 8 PA7 OO N O SLCT IN signal Jumper J 1 PBO DIP switch 1 1 to 1 8 PB7 17 PCO TXD data output 20 PC3 OO N ON LINE switch interrupt input 5 P S Parallel Serial data transfer selection signa
25. SIV 8V sng sseppy 29440 LL di V9 ave gn Xo0g ab Joulew sseppy Jpo eq ELI Ji 9H0184 de ss EI 89 40 0disng dd 1 V4 MY 0 1 991 603 20320 0 sng J 04jU0D 9Sbug 19110204 101295 0505 9304J04U 1010 10001480 Figure 2 9 Control Circuit Block Diagram 2 12 REV A The control circuit consists mainly of the following ICS pPD7810HG CPU 4B The 4 PD78 10HG CPU executes the program in the 27256 PROM 4A and controls all of the printer operations The CPU begins executing the program from address OOOOH upon receiving the reset signal The CPU also reads the DIP switch and jumper settings and detects the states of the analog circuits 27256 PROM 4 The 27256 PROM includes the control program firmware and character generators HM6264 SRAM X 2 5A 6A The HM6264 SRAMs are external memories for the CPU They are used as an input data buffer and line buffer for expanding data and as a working area for the program 8K x 2 16K bytes E05A16G gate array 7 The 16GA gate array controls handshaking for parallel data including the optional interface the control panel plunger speed of the carriage motor and reset signal The gate array also generates Italic and Super subscript charact
26. This EP ROM is a ultra violet erasable and electrically programmable ROM of 32 K bytes Features Capacity of 32768 words X 8 bits vop with TTL compatible i Power supply 5V DC ix Access time 250 ns as 28 pins DIP N4 Terminal Functions AO AI A Input address AO e Chip enable bet D 4 12 Output enable P DO D7 Input Output data GND 14 Figure A 10 HM27256G 25 Pin Diagram Dota Out put 0 eos GND o ee Figure A 1 1 HM27256G 25EP ROM Block Diagram Output Buffer Y Select Address Input A14 Memory Cell Mat rix 262144 bit REV A Table A L 7 HM27256 EP ROM Signal Status Mode CE OE 9 outputs Read L Vcc Vcc D out Output Disable L Vcc HighZ Standby H Vec Vcc High Z High Performance Program L Vpp Vcc D in Program Verify H Vpp Vpp D out Optional Verify L Vpp Vpp D out Program Inhibit H po qu sx Vpp Vcc HighZ Identifier L L VH Vcc Vcc Code NOTES 1 X Don t care 2 VH 12 0V 0 5V 3 Vcc 0 6 7V 4 Vpp 0 6 14V t 1 5 HM6264ALSP 12 CMOS ST RAM This is a 8K byte CMOS static RAM which has low power consumption and its input output level is compatible with the TTL ICs Features Capacity of 8192 words X 8 bits 1 0 with TTL compatible Power supply 5V DC CS access time 120ns 28 pins DIP Functions AO Al
27. When the user resume printing the paper is fed backward to the loading position REV A Table 1 20 International Character Set Country SW 1 8 Table m USA France Germany UK Denmark CG Table 2 Sweden Italy Spain ges NOTE When DIP SW 1 4 is on IBM mode the functions of DIP SW 1 6 through SW 1 8 change to IBM character generator selection Table 1 21 DIP Switch 2 Settings Description 2 4 Auto line feed On off aia 1 4 2 J umper Setting The jumper J 1 is located on the main board and it can fiy ie sL T signal to LOW level Table 1 22 J1 Setting ON Fix to LOW OFF Depend on the external signal NOTE If the jumper J 1 is connected the SLCT IN signal is fixed to LOW and DC 1 DC3 printer select control is ignored 1 18 REV A 1 5 SELF TEST OPERATION The FX 850 1050 printer has the following self test self printing function which checks the following Control Circuit Functions Printer Mechanism Functions Print Quality DIP Switch Settings Table 1 23 lists the self test operating instructions and Figure 1 8 shows the self test printing Draft NLQ Table 1 23 Self Test Operation Type face Start stop Turn the power ON while pressing the LINE FEED switch Paper out condition 9 Press the ON LINE switch and turn Turn the power ON while pressing the the power OFF FORM FEED switch
28. on the speed mode Table 2 14 shows the set times for constant paper feed motor speed Deceleration control The paper feed motor is decelerated in accordance with the deceleration time table The deceleration time varies depending on the speed mode The number of deceleration steps for each speed mode are the same as the acceleration steps at the corresponding speed mode When the paper feed motor decelerates and stops the drive voltage 36 V is turned on and off chopping so that the motor stops stably When the paper feed motor stops the motor drive control is performed during the drive voltage chopping operation so that any backlash in the gears of the paper feed mechanism can be taken up Paper feed control in the NLQ mode When the NLO Near Letter Quality printing operation shifts from the first pass to the second pass the phase excitation system for the paper feed motor changes from the 2 2 phase excitation system The paper feed motor is driven once using the 2 2 phase excitation system then once using the 1 2 phase excitation system Therefore when the NLO printing operation is on the second pass the paper feed motor is held by the 1 2 phase excitation system 2 56 REV A Paper Loading Ejecting Operation Flow Figure 2 46 shows the general operation chart of the paper loading ejecting sequence LOAD EJECT SW ON Paper Release Lever position Friction Tractor Paper End Y Peper loading
29. ond CN10O connecting the PEGX boord and the printer mechanism inserted No th carriage move to the home position Yes Yes Replace the PEGX board Replace the printer machanism Is the fault corrected 5 12 et f REV A 3 The carriage operates normally but the self test printing is incorrect START Set the head odjustment ever at the 2ncposition and perform eelf test Is printing executed PEGX boord ond the mechonism Inserted securely Is any dot missing Measure the printhead col resistance Figure 5 3 Page 5 12 Yes Replace the printhead Is the measurement normal No Repioce the printheod ls the fault corrected lace the mechonism 18 the fault corrected Reploce the printheod 5 13 REV A 4 The self test printing is normal but the paper is not fed properly START Is the poper se correctly Set the paper correctly Does the platen knob rotate snooty when turned Manually with OFF Replace the printer mechanism Does the paper feed motor eatup at power ON Yes Replace the PEGX board Is the fault corrected Reploce the printer mechanism Replace the PEGX board 5 14 REV A 5 The control panel does not operate correctly
30. operafitnm Paper back out operation Cutsheet ejecting operation Paper End CSF loading operation Cut Sheet Loadiing operatiiam Paper Bail close operation RETURN Figure 2 46 Paper Loading Ejecting Operation REV A 2 3 5 4 Plunger Drive Circuit The gate arrays 15GA 7A EO5A 16 3A control this circuit to drive the plunger to open and close the paper holding lever for paper auto loading ejection Figure 2 47 shows the drive mechanism Figure 2 48 shows the shows the plunger drive circuit and Figure 2 49 and Table 2 15 shows the on off timing of the transistors during the plunger drive and paper holding Paper Holding e ep Platen Plunger Figure 2 47 Plunger Mechanism vu 5V GA 5 15 Figure 2 48 Plunger Drive Circuit REV A 36L 015 9 016 OA v i 36 5 IS NL Plunger Distance from Point _ _ _ m t Figure 249 Relationship Between Transistors and Plunger Voltage Table 2 15 Relationship Between GA Ports and Plunger Voltage E05A15GA E05A16HA Supplied Power V plunger P5 LOW HIGH HIGH Plunger Specifications Voltage Driving 36 V Holding 5 v No operation O V Coil Resistance 22 5 at 20 C Current Driving 1 6A typical Holding 0 23A typical 2 59 2 3 5 5 Printhead Control Circ
31. problems Paper Release Lever Tractor Transmission Gear Paper Tension Roller Gear Tractor Gear Paper Tension Roller Transmission Gear P Feed Motor Pinion Gear Friction Tractor Sensor Paper Feed Transmission Gear i Side View ii Top View a Gear Arrangement Paper Tension Support Roller Paper End Sensor Paper Feed Roller Friction State b Platen Path Figure 2 7 Friction Feeding Method 2 9 REV A 2 3 CIRCUIT OPERATION g gt The main circuits of the printer are on the PEGX board the control panel the PEBFIL II board and the power transformer 2 3 1 General Information The PEGX board includes the various circuits that supply DC voltage control all of the printer operations and the control panel and process data from the host computer 2 3 1 1 Power Supply Section Figure 2 8 shows a block diagram of the power supply section Vu 36 VDC Full wave rectifier m 5 24 VDC gt 12 VDC Circuit etg Vx Voltage Figure 2 8 Power Supply Block Diagram REV A The power supply circuit is divided into the PEGX board PEBFIL II board and power supply transformer This circuit converts the AC voltage from the step down transformer into the DC voltage required to drive the printer mechanism and operate the control circuits The AC voltage from outside the printer is input to the step down transform
32. received after the dot wires of the printhead see Figure 2 3 have been fiven for the maximum allowable drive time to prevent the printhead from being damaged dot Protect lon CPU Circuit To Printheod Driver t 1 i t Figure 2 52 Half dot Protection Circuit Block Diagram 2 62 REV A Drive Transistor Short circuit Check During printing the CPU continuously checks the printhead drive transistors Q to Q9 for short circuits The short circuit check is performed between drive cycles any of the drive transistors are shorted a LOW signal is input to AN2 of the CPU Upon receiving this signal the CPU stops printing shuts off the 24 V drive voltage and rings the buzzer See Figure 2 50 Bi directional Printing Alignment For bi directional printing printing position alignment is performed The print timing pulse is delayed when the printhead moves from right to left to align the vertical printing positions printed when the printhead moves from left tot right with those printed right to left If a misalignment occurs it can be adjusted using the control panel Seee Section 4 3 3 2 63 REV A CHAPTER 3 OPTIONAL EQUIPMENTS Intentionally omitted at this time m e ru lt I REV A CHAPTER 4 DISASSEMBLY ASSEMBLY AND ADJUSTMENT 4 4 GENERAL REPAIR INFORMATION eene 4 1 4 2 DISASSEMBLY AND ASSEMBLY
33. 0035 Weight Kg 45 55 Quality Plain paper Not available Envelope Refer to Table 1 7 Table 1 7 Envelope Specifications FX 850 1 050 166 X 92 240 X 104 Weight Kg 39 78 12 24 Ib Quality Plain Bond Air mail Operating conditions Printing must be executed at normal room temperature Envelopes must be oriented with the long direction parallel to the carriage 1 5 REV A Label Refer to Table 1 8 f Table 1 8 Label Specifications FX 850 1 050 63 5 X 2 38 2 5 X 15 16 101 6 X 2 38 4 X 15 1 6 101 6 X 36 5 4 X 1 7 1 6 Thickness mm less than 0 19 0 0075 Printable Area Cut sheet paper See Figure 1 3 1 12 10 1 14 4 182 257 366 mm 0 12 3rnm Printable area 0 12 3mm or more or more 0 33 8 5mm r or more ABC xv2 i A t a Max 14 3 b 364 l e a f e a ABC XY24 0 87 22mm or more NOTES 1 Values in the parentheses apply to the FX 1050 2 Printing is possible for approximately 42 mm after the bottom edge of a page has been detected Thus the value 13 5 mm lowest print position is given for reference only Paper feed accuracy cannot be assured in the area approximately 22 mm 0 87 from the bottom edge of the page Figure 1 3 Cut Sheet Paper Printable Area 1 6 REV A Fanfold paper See Figure 1 4 4 0 6 254 406 mm Printable area _ 2 203 3 35
34. 2 Input address WE Write enable Output enable CST CS2 Chip select DO D7 Input Output data NC No connection Figure A 1 2 HM6264ALSP 12 Pin Diagram Memory Celi Array 512 X 16 x8 Column Decoder Address Buffer Taput Qutput Buffer 01 02 03 04 0506 Figure A 1 3 HM6264ALSP 12 Block Diagram REV A Table A 1 3 HM6264ALSP 12 Signal Status 1 0 Terminal High 2 Power down High Z Output disable Data out Read cycle Data in Write cycle 1 Data in Write cycle 2 E A 22 REV A A 1 6 NJ M2355 The NJ M2355 function is identical to the TL949 functions It is a pulse width modulation control circuit IC Figure A 1 4 shows the NJ 2355 internal circuit diagram IN FEED DEAD POWER BACK TIME Vcc 2 GND CONTROL uel Dri Lel isl ai Ei Vref IN FEED DERD SYSTEM cl BACK TIME GND CONTROL Figure A 14 NJM2355 Internal Circuit Diagram REV A A 1 7 STK6722H 4 Phases Stepper Motor Driver The STK6722His an uni polar constant current chopper driver for the four phases stepper motor Figure A 1 5 STK6722H Pin Diagram Figure A 1 6 STK6722H Internal Circuit Table 14 5 6722 Terminal Function Direction Function T 35V DC power CR motor phases A and B common Surge voltage of CR motor coils C
35. Al 4 5 OUT OUT OUT IN Not used IN Reset signal input Logic Ground Function Printhead driving signal Paper feed motor driving signal Not used 5V Plunger solenoid driving signal Write strobe signal Read strobe signal Printhead driving signal Head Data 9 Address bit Al 2 Al 5 input Address bit AO A2 output Address Latch Enable Address bit A3 A7 output Input Output data bus DO D7 5V NOTE Direction on the signal flow is as viewed from the gate array 2 30 REV A 2 3 3 3 E05A16GA Gate Array Functions E05A16GA gate array is selected by the CS signal 37 decoded by the higher address in the E05A 15HA from the E05A15HA gate array 3A and the internal function of this gate array is activated when the CPU reads or writes data at the memory mapped address lower address AO through A3 Table 2 5 shows the pin assignments for this gate array Refer to the Appendix for the detailed specifications on this gate array Table 2 5 Pin Function of GA EO5A16GA Pin No Signal Name Direction Function 1 D4 IN OUT Data bus bit 4 7 D 6 RTN wN Initialize signal IN IT input Low active signal 7 Vss R Logic ground 8 Power on reset signal 9 IN7 Parallel data D7 D2 IN2 17 Parallel data D 1 DO is 19 OUT Reset signal output which the RSTIN1or RSTIN2 signal is input 20 OUT BUSY signal 21 ACK OUT Acknowledge signal 22 PEs OUT
36. Assembly Left Removal 4 35 Figure 4 51 Tractor Assembly Phases 4 35 Figure 4 52 Paper Tension Roller Assembly Removal 4 36 Figure 4 53 Ribbon Mask Holder and Ribbon Mask Corifigurati n i e tem e en 4 37 Figure 4 54 Platen Gap 4 38 Figure 4 55 Eccentric of Carriage Guide Shaft 4 38 Figure 4 66 Platen eek RI rer x 4 38 Figure 4 57 Paper Feed Motor Pinion Gear Backlash i i cer reete EXERCI GO e OTRO OG TE E 4 40 Figure 4 58 Bi Directional Print Alignment Adjustment Sequence vicina 4 41 4 iii REV A Table Table Table Table Table 4 1 4 2 4 3 4 4 4 5 LIST OF TABLES Maintenance Tools seems 4 1 Measuring Instruments wid 1 Lubricants and 41 Abbreviations List of Small Parts 4 6 Form and Abbreviated Part Name of Screws 4 6 REV A 4 1 GENERAL REPAIR INFORMATION This chapter describes the disassembly procedures to be used for replacing any of the main components of the FX 850 1 050 Required and helpful tools measuring instruments and lubricants listed in Tables 4 1 through 4 3 Table 4 1 Maintenance Tools Description Necessary Part No Philips screw
37. Bit Image Mode Assignment ESC ESC k ESC L 5 1 ESC ESC 2 ESC Z 5 3 Printing Effects Cleared 1 21 REV A 1 8 BUZZER OPERATION AND ERROR CONDITIONS p gt This section describes the buzzer operation and error conditions of the printer 1 8 1 Buzzer Operation The buzzer beeps as follows When a BEL code is sent to the printer the buzzer sounds for 0 1 second When the following error has occured Carriage Beeps 6 times pausing briefly after 3rd beep Beeps 20 times pausing briefly after every 4 beeps Abnormal Beeps 5 times pausing every beep RAM Ertl Beeps 6 to 10 times pausing briefly after every 2 beeps The beeps warn which RAM is incorrect as follows 6times Internal RAM CPU 8times Lower Address RAM IC 10 times Upper Address RAM IC i Short circuited printhead e drive Beeps 10 times pausing after every beep Recognition of the control panel operation Beeps once in the following cases Self print mode Hexadecimal dump mode Print mode setting Proportional space alternation Beeps once when old proportional space is selected and twice new one is selected 1 8 2 Error Conditions The printer enters an error state and sets the ERROR signal LOW and BUSY signal HIGH to proh
38. DIP Switch Settings eene 1 17 14 2 Jumper Settings oouiiouidavetisatieiei re 1 18 1 5 SELF TEST OPERATION uci 1 19 1 6 HEXADECIMAL DUMP FUNCTION eme 1 20 1 7 PRINTERINITIALIZATION isses eee 1 21 1 7 1 Hardware Initialization eee 1 21 1 7 2 Software Initialization ood 1 8 BUZZER OPERATION AND ERROR CONDITIONS 1 22 18 1 Buzzer Operation ires 1er ce ere hene ee coi eei DO e a 1 22 1 8 2 Error Conditions 21020 1 22 1 9 PAPER HANDLING FUNCTIONS 644 1 23 1 9 1 Autoloading and Backout Function 1 23 1 9 2 Short Tear Off Function weed 223 1 9 3 Micro Adjustment Top of Form TOF Set Function 1 23 1 10 PAPER END DETECTION wcities 1 24 1 11 MAIN COMPONENTS 0 1 46 d 729 1 11 1 Printer Mechanism 0 1 26 1 11 2 PEGX Board Main Board 1 27 1 11 3 PEBFIL II Board Filter Board and Power ion 1 28 1 11 4 PGPNL Board Control 1 29 1 11 5 Housing vices 1 31 LIST FIGURES Figure 1 1 Exterior Views of the 850 1050 1 1 Figure 1 2 Printh
39. E05A16GA Initialized State 18 HM27256 EP ROM Signal Status A 20 HM6264ALSP 12 Signal Status A 22 STK6722H Terminal Functions wie A 25 Connector CN1 Pin Assignments ne A 28 Connector CN2 Pin Assignments ene A 28 Connector CN3 Pin Assignments enne A 28 Connector CN4 Pin Assignments 44 A 28 Connector CN5 Pin Assignments 4 A 28 Connector CN6 Pin Assignments ssc A 28 Connector CN7 Pin Assignments aru A 28 Connector CNB Pin Assignments uss A 28 Connector CN9 Pin Assignments acne A 28 Connector CN1 Pin Assignments A 28 Connector CN11 Pin Assignments A 28 FX 850 Parts Name Reference A 33 1 050 Parts Name Reference A 37 REV A A 1 IC DESCRIPTIONS This section describes the primary ICs used in the FX 850 1050 Table A 1 IC List PEGX Board IC Name wPD7810HG Description Part Number IC Location X4000780 10 4B E05A15HA 46 1800002 3A E05A16GA 46 1800003 7A STK6722H Hybrid IC X4406722 10 2A NJ M2355 Switching Regulator X440072350 1A Table A 2 Transistor List Transistor Name Description Part Number Location 25 3987 60 10V 2W 302398709 01 09 016 2SA1 450 80V 50
40. EJECT switch is pressed with a sheet loaded the sheet will be ejected Loading and ejecting continuous paper auto back out Pull the paper release lever forward load continuous paper onto the push tractor unit and press the LOAD EJECT switch so that the paper is automatically fed up to the TOF position When the LOAD EJECT switch is pressed with the paper loaded the paper is fed in the reverse direction ejected up to the tractor waiting position auto back out If the paper cannot be fed in the reverse direction at 1 6 inch line spacing the paper ejection process will be terminated 1 9 2 Short Tear Off Function For continuous paper when the paper release lever is moved to the tractor feeder side the paper will be automatically fed to the perforations tear off position when printing is completed no data is being received from the host computer and the print buffer is empty At this time the micro adjustment TOF set function becomes valid so that the tear off position can be adjusted accurately using the LF and FF switches The adjusted tear off position is stored in the memory and remains valid even after the printer power is turned off so that the paper will be automatically fed to that position when the tear off function is executed later After the paper is cut off the paper is automatically returned to the previous position by sending new print data or setting the printer OFF LINE 1 9 3 Micro Adjustment Top of Form Set Func
41. Remove the paper feed motor Refer to Section 4 3 5 7 Step 6 Cut wire clamps fix cables to the base frame FX 850 Wire Clamp Wire Clamp FX 1050 Figure 4 33 Wire Clamp Positions Step 7 Remove the home position sensor and plunger cables from the base frame Plunger Cable Base Frame Home Position Sensor Cable Figure 4 34 Cable Positions on the Base Frame 4 25 REV A Step 8 Remove two CPS 0 3 X 10 screws securing both side frames L and R to the base frame f U A Side Frame R CPS 0 3x 1 o SubPaper Release Lever CPS O 3x 1 Side Frame L to Figure 4 35 Side Frame Screws Removal Step 9 Remove the sub paper release lever from the side frame R See Figure 4 35 Step 10 Detach the hooks on the main unit from the base frame and pull the main unit up Hooks Base Frame Figure 4 36 Printer Mechanism Separation 4 26 REV A Plunger Paper End Sensor Carr age Timing Belt Figure 4 37 Main Frame Unit Paper Feed Roller Paper Guide Plate Ribbon Driver Home Position Senser FPC Figure 4 38 Base Frame Unit ASSEMBLY POINT When fitting the main frame to the base frame hook the eight tabs into the holes in the base frame and pull it forward ADJUSTMENTS REQUIRED The following adjustmentt is required to reassemble the printer mechanism 4 32 Paper Feed Nistor Baatilasth ANjiuswent 4 27 REV A 4 2 5 43 Ribbon Driver Unit Rem
42. Remove three paper feed springs for the FX 850 or four for FX 1 050 from the hook on the base frame Base Frame w Paper Feed Roller Unit Paper Feed Spring Figure 4 45 Paper Feed Roller Unit Removal 4 2 5 17 Paper End Sensor Removal Step 1 Remove the printer mechanism refer to Section 4 2 5 1 Step 2 Separate the main and base units Refer to Section 4 2 5 11 Step 3 Loosen the two bends securing the paper end sensor to the back of the paper guide Step 4 Remove the paper end sensor Adhesive Tape Paper End Sensor Figure 4 46 Paper End Sensor Removal 4 32 C REV A 4 2 5 18 Paper Holding Roller Set and Paper Holding Levers L and R Removal Step 1 Remove RE 3 at the outside of the paper holding lever R on the paper holding roller set Step 2 Remove the right and left end of the paper holding roller shaft from the paper holding levers Step 3 Remove the carriage motor Refer to Section 4 2 5 4 RE 3 Paper Holding Lever L Paper Holding Lever R EE Paper Holding Roller Shaft Carriage Motor Figure 4 47 Paper Holding Roller Shaft Removal Step 4 Remove RE 3 at the side frame R See Figure 4 48 Step 5 Detach the paper holding lever R spring from the paper holding lever R Step 6 Remove the paper holding lever R Paper Holding lever R Spring Paper Holding Lever R 3 Figure 4 48 Paper Holding Roller Lever R Removal REV A Step 7 Remov
43. Since it has two buffers for print data and automatically activates the half dot protection circuit it can protect the printhead from damage due to programming mistake or a malfunction Automatically switches the phases of the carriage motor and paper feed motor using the external clock signal BNKO 1 64 BNK 1 2 63 087 CS4 3 62 DB6 CS3 4 61 085 CS2 5 60 DB4 CS1 6 59 DB3 P4 7 58 DB2 P3 8 57 DB1 P2 9 56 DBO P1 10 55 Al Po 11 54 6 12 53 5 13 52 4 14 51 PFD 15 50 CTRG HD 1 16 49 ALE HO2 17 48 Vss HD3 18 47 RST HD4 19 46 CTRG HD5 20 45 A2 HD6 21 44 Al HD7 22 43 AO HD8 23 42 A 15 N C 24 41 A 14 Vss 25 40 A 13 PWD 26 39 A 12 CRA 27 38 HD9 CRB 28 37 14 29 36 13R 30 35 RD CTRGO 31 34 WR 32 33 P5 Figure A 6 GA E05A15HA Pin Diagram A 7 REV A PFD CRA CRD Paper Feed Stepper Motor Phase Switching Circuit Figure 7 GA 15 internal Block Diagram A 8 SRN o 3 N ND N 8 a C gt 34 AIR 4 5 oj Table 7 05 15 Port Functions Signal Direction Function BNKO OUT Bank Select signal BNK1 OUT cs4 OUT Chip Select signal CS1 P4 Input Port Po PFA f OUT Motor Control Port Paper Feed Motor PFD HD 1 f OUT Printhead Data Port HD8 PWD Print D
44. Table 1 21 Switch 2 Settings 2 2 44 1 18 Table 1 22 41 Setting acu cits edere actetuer eina 1 18 Table 1 23 Self Test Operation rnnt 1 19 Table 1 24 Hexadecimal Dump 1 20 liii REV A REV A 1 1 FEATURES The FX 850 and FX 1 050 are serial dot matrix 9 pin terminal printers that print at a maximum of 264 CPS Either model FX 850 with 80 columns or FX 1050 with 136 columns be selected according to your requirements The main features are as follows Max printing speed 264 CPS Draft and Elite 220 CPS Draft and Pica Advanced paper handling functions Auto tear off Auto loading Auto back out Micro adjustment SelecType function Any print mode can be selected directly from the front panel Once a mode is selected it is stored in the non volatile memory and is selected when the printer power is turned on Two NLQ fonts Roman and Saris serif are standard Printer driver EPSON ESC P 83 is standard This driver is compatible with the high class models such as FX 800 1000 86e and 286 Double height function Pitch control is possible in the mode Pica elite proportional modes Since the IBM emulation mode is standard these printers are IBM compatible The IBM characters are also standard 8K byte input data buffer Buffering can be disabled Push tractor unit Printing is possible on envelopes
45. Table 2 1 Board Connector Summary Description Standard 8 bit parallel interface connector Used for data transfer from the host computer Connector for the optional interface board Used for data transfer from the host computer When the optional interface board is mounted CN 1 is invalid Supplies two step down AC voltages from the power supply transformer to the DC regulator circuit on the PEGX board Drives the printhead needles Drives the plunger that opens and shuts the paper bail on the printer mechanism Transfers the state of the carriage home position sensor from the printer mechanism to the con trol circuit on the PEGX board Transfers the state of the paper end sensor from the printer mechanism to the control circuit on the PEGX board Drives the paper feed motor Drives the carriage motor Transfers the state of the release lever from the printer mechanism to the control circuit on the PEGX board Interface connector between the PEGX board and the control panel 2 2 Number of Pins 36 26 12 20 Reference Table Table A 1 5 Table A 1 6 Table A 1 7 Table A 1 8 Table A 1 9 Table A 20 Table A 2 1 Table A 22 Table A 23 Table A 24 Table A 25 f E REV A 2 2 PRINTER MECHANISM OPERATION The printer mechanism is a 9 pin serial dot matrix impact mechanism Figure 2 2 shows a drawing of the mechanism The name in the rectangles indicate relationship between eac
46. The carriage motor constant speed depends on the constant speed set time which varies with the carriage speed mode Printing is possible when the carriage moves at a constant speed Table 2 10 shows the set times for constant carriage speed Deceleration Control The carriage motor is decelerated in accordance with the deceleration time table The deceleration time varies depending on the speed mode The number of deceleration steps for each speed mode are the same as the acceleration steps at the corresponding speed mode Refer to Table 2 10 High Speed Skip High speed skip causes the carriage to skip over blank areas at the high speed of 3840 PPS If a blank area continues for nine characters normal characters or more after a print command CR or LF command is received the carriage is controlled to skip the area at the high speed of 3840 PPS As the carriage comes to the end of the blank area the carriage speed is lowered so that printing can be started at the speed corresponding to the specified printing mode Figure 2 40 shows the high speed skip operation Printable Area acceleration deceleration A Choracter DIV Stap position oS Carriage Movement Figure 2 40 High Speed Skip Operation 2 50 ane REV A Home Position Seek Operation The function which moves the carriage to the home position after CPU inputs RESET signal is called home position seek This is op
47. and labels in addition to fan fold paper cut sheets and roll paper User defined characters are supported in both the Draft and NLQ Saris serif modes Once a character is registered it is stored in the non volatile memory and need not be re registered The user defined character set can only be selected as a default character set using the DIP switches Compatible with EPSON optional interface board series 81 XX FX 850 Figure 1 1 Exterior Views of the FX 850 1050 REV A No 483 10 731 1 731 2 7339 7340 8750 8755 8758 81 Table 1 1 Optional Units Name Roll Paper Holder Pull Tractor Unit Pull Tractor Unit Cut Sheet Feeder single bin Cut Sheet Feeder single bin Ribbon Cartridge Ribbon Cartridge Ribbon Pack Optional Interface Board FX 850 Table 1 2 Optional Interface Boards No 8 143 New serial interface 8 148 Intelligent serial interface 88145 RS 232C current loop interface type II 8 149 Intelligent serial interface type II 8 149M Intelligent serial interface type III 816 1 IEEE 488 interface 8 165 Intelligent IEEE 488 interface 8172 32 K byte buffer parallel interface 81 72M 128K byte buffer parallel interface 1 2 FX 1 050 REV A 1 2 SPECIFICATIONS The FX 850 1 050 communicates With a wide variety of host computers This section describes the specifications for the printer 1 2 4 Hardware
48. applied to the negative terminal and the positive terminal will receive an equal voltage when based on Figure 2 24 a negative current of the following value flows Output Voltage Rg R3 24V 560 ohms 0 22 ohms R4 K ohms 5 55 A If the current exceeds this value over current protection is turned on to reduce the output voltage OUTPUT Voltage f Figure 2 24 Over Current Protection OCP Dead time control has no bearing in this case because pin 3 of IC 1 1 is grounded 2 24 REV A 2 3 2 8 12 VDC Supply Circuit The 12 VAC from the transformer is half wave recrified by diode D7 and is converted to 12 VDC As shown by Figure 2 25 the half wave rectified voltages pass through the capacitor smoothing circuit that the ripple is small and the average DC voltage rises when no load current flows and drops as load current increases CN1 O Figure 2 25 12 VDC Circuit 2 25 REV A 2 3 2 9 Vx Voltage Supply Circuit 4 When the 24V power supply line reaches 18 6 V 18 V 0 6 V transistors 023 turn on and Vx 5 V is output On the other hand if the 24V power supply line drops to 18 6 V or less Q30 and Q23 turn off and the Vx voltage is shut off Reset Circuit Power Supply When the power is switched on or off the circuit is reset so that it will not drive the printer until the power supply becomes stable 24 5V Figure 2 26 Vx Voltage Circuit tL i 2 26
49. carriage guide shaft B is rotated or removed Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the printhead Refer to Section 4 2 5 2 Step 3 Remove the ribbon mask Figure 4 53 Ribbon Mask Holder and Ribbon Mask Configuration Step 4 Reinstall the printhead on the carriage NOTE When reinstalling the printhead lock the head lock levers while pushing the printhead forward and downwoard Step 5 Move the carriage to center Step 6 Lighty loosen the HNO 4 nut securing the head adjustment lever See Figure 4 50 Step 7 Turn the larger countersink of carriage guide shaft B upward See Figure 4 55 Step 8 Insert the blade of a screw driver a diameter is approx 3 mm into the countersink of carriage guide shaft B See Figure 4 55 4 37 REV A Screw Driver Thickness Gauge lt Countersink gt Large Small gt de carriage Guide Shaft B Figure 4 54 Platen Gap Adjustment Step 9 Set the head adjustment lever at the 2nd position Step 10 Push the paper release lever all the way back Gap value 0 51 0 05 mm Step 11 Adjust the platen gap using a thickness gauge while rotating carriage guide shaft B in the direction of the arrow in Figure 4 55 WARNING At this time the paper release lever must be in the friction feed position Do not turn it forward Screwdriver 0 51 0 05 Platen carriage Guide Shaft B Printhead screw a a
50. diagram Figure 2 29 shows the parallel interface data transmission timing GA CPU 16 78 10HG 7A IN7 D7 INO DO DATA BUS STROBE HOST COMPUTER ACK m ERR PE AUTO FEED XT Figure 2 28 Interface Control Circuit Block Diagram REV A BUSY ACKNLG d DATA b p STROBE Figure 2 29 Data Transmission Timing Sequence Data transmitted from the host computer is latched into the gate array at the trailing edge of the STROBE signal The gate array IC7A then outputs the BUSY signal to the host computer 2 The CPU reads the data latched in the gate array and clears the BUSY signal However the CPU also outputs a software generated BUSY signal to the host computer via the gate array 7 so that the BUSY signal to the host computer remains HIGH 3 The CPU stores the data from the gate array 7 in the input buffer IC5A and informs the gate array of completion of data processing through the data bus The gate array outputs the ACK signal to the host computer to indicate that 1 byte of data has been processed The CPU then clears the BUSY signal 4 The printer is now ready to accept the next data byte 2 35 REV A Serial Interface Control Circuit f Serial data communication between the printer and host computer is controlled by the serial interface 5 board 8 143 Other buffered serial interface boards are
51. for disassembling the main components of the printer mechanism Figure 4 14 shows the relationship of the printer mechanism s major components for reference during assembly Refer to Figures A 20 through A 25 in the Appendix during assembly START Section 4 2 1 Upper Case Removal Section 4 2 3 Push Tractor Removal Printer mechonism Removal Section 4 2 5 2 Printhead Removal Section 4 2 5 10 Platen Unit Removal Section 4 2 5 9 Section 4 2 5 6 Section 4 205 3 section 4 2 5 8 Home Position Sensor Printheod FPC Friction Troctor Plunger Removal g Removal Removal Sensor Removal Section 4 2 5 7 Paper Feed Motor Removal Section 4 2 5 4 Carriage Motor Removal Section 4 2 5 5 Timming Belt Belt Driven Pulley Removal Section 4 2 5 11 1 Section 4 2 5 12 Paper Release Lever Main and Bose Frame Removal Removal Section 4 2 5 16 1 Paper Feed Roller Removal section 4 2 5 15 Paper Guide Plate Removal 1 Section 4 2 5 13 Section 4 2 5 17 gt Driver End Sensor Removal Section 4 2 5 14 Carriage Removal Figure 4 14 Printer Mechanism s Component Relationship 4 12 4 2 5 1 Printer Mechanism Removal Step 1 Remove the upper case Refer to Section 4 2 1 Step 2 Remove the push tractor unit Refer to Section 4 2 3 Step 3 Disconnect connectors CN4 CN5
52. left tractor belts are aligned in parallel Pin Tractor Belt Tractor Frame Marks Figure 4 51 Tractor Assembly Phases 4 35 REV A 4 2 5 20 Paper Tension Unit Disassembly This section describes the removal of the paper tension roller assembly Since disassembled parts can be reassembled by using these procedures in reverse order the assembly procedures have been omitted Step 1 Remove the RE 4 on the paper tension roller shaft at the inside of the paper tension frame R Step 2 Remove the RE 4 on the paper tension roller shaft at the outside of the paper tension frame L Step 3 Remove the CPS O 3 X 10 screw securing paper tension frame Lto paper tension base frame Step 4 Remove the HNO 4 nut Step 5 Disconnect the paper tension shaft holder from the paper tension frame R by sliding it toward the outside then remove it RE 4 RE 4 HNO 4 Shaft Holder Paper Tension Roller Shaft Paper Tension Frame L R Paper Tension Frame R Figure 4 52 Paper Tension Roller Assembly Removal m d Lum REV A 4 3 ADJUSTMENT This section describes the adjustment procedures required when reassembling this printer When disassembly or replacement is performed during maintenance or repaires of the parts described in this section the following adjustments should be performed to ensure proper operation 4 3 1 Platen Gap Adjustment Adjust the gap between the platen and the printhead when
53. motor is a 4 phase stepper motor The rotation of the motor position and speed is controlled by outputting the phase switching signal generated by the EO5A 15 gate array and switching the common voltage driving or holding Carriage motor drive circuit The carriage motor drive circuit drives the carriage motor using the carriage motor control signals The carriage motor is a 4 phase stepper motor The rotation of the motor position and speed is controlled by outputting the phase switching signal generated by the EO5A 15HA gate array and switching the common voltage driving or holding Printhead drive circuit The printhead drive circuit drives the printhead after expanding the printhead data Data from the host computer is processed and expanded so that it is converted to dot data for one vertical row Printing is executed by expanding the patterns for vertical rows as the carriage moves REV A 2 3 1 3 Memory Mapping f This printer is controlled by PEGX circuit board which equips pPD7810HG CPU with 64 K bytes of address space Figure 2 10 shows a memory map of this address space FFFF HEX G A E05A15HA FOOO HEX GA E05A16GA EOOO HEX 000 HEX ST RAM 6A 8KB Back up i HEX ST RAM 5A 8000 HEX Program and Character Generator 32 KB 0000 HEX Figure 2 10 Memory Mapping REV A 2 3 2 Power Supply Circuit This section describes the operation of power supply circuit The power supply circui
54. panel operation addcording to the alignment sequence flowchart shown in Figure 4 58 START thee pageer thi sirmess lever position to 2nd position the paper Set the ribbon cartridge Turn the power switch on while pressing the CONDENSED switch The buzzer beeps twice The printer enters the Bi D adjustment mode Press the control panel switch as following sequence 3 4 See Fiaure The pressing operation is required quickly It must be done within 4 seconds beeps every pressing if pressing operation is slow the printer becomes on line state during operation and disable the Bi D adjustment mode Execute the Speed Model print operation See Figure B Figure 4 58 Bi Directional Print Alignment Adjustment Sequence 4 41 Figure A Pressing Sequence REV A Print A dgnment Adjust the bi direction print alignment by the following control panel operation Pressed Switch Ad value CONDENSED right shift decrease LOAD EJECT left shift increase Press FORM FEED switch Press LINE FEED switch Execute the Speed Mode 3 print operation Adjust the bi direction print alignment by the following control panel operation Pressed Switch Even Line Adjust Value CONDENSED right shift decrease LOAD EJECT eit shi increase Press FORM FEED switch Figure 4 58
55. repair The user observes waveforms and voltages on the oscilloscope by following the instructions given on the CRT screen and inputs the results in YES NO format After the checks are finished the suspected part is displayed on the screen This mode determines the malfunctioning part at its conclusion TO CHECK THE REFERENCE VOLTAGE OF A D CONVERTER IS THE VOLTAGE LEVEL IC7B CPU PIN42 ABOUT 5V NON SYNC 2V DIV OR N 0 ESC DEL F 1 KEY Figure 5 6 Question Screen Example The 2nd line is the question The 3rd line describes the range of oscilloscope NON SYNC Internal Trigger Mode SYNC External Trigger Mode If the answer is Yes then press Y If the answer is No then press N To leave this part of the test press the ESC KEY To return to a previous part of the test press the BS or DEL KEY To return to the main menu press the F1 key and Enter key 5 5 REV A 4 Test Print Mode C This mode is selected by choosing No 4 on the menu screen This mode is useful for testing printer functions Unlike the built in printing test this mode can perform various test operations The main functions are as follows Checks the circuits including the parallel and serial interface circuits Selectable Interface Checks the Bi Directional printing position lag during actual printing Checks the paper feed unit backlash Checks the printed wires Pins Prints a bit image t
56. signal SLCTIN is selected by the host computer When jumper J 1 is connected the SLCTIN signal is internally fixed always selected J2 Switches the memory capacity 5 12K bits or 256K bits for the PROM 4 REV A 2 3 4 4 Memory Back up Circuit f gt The printer is equipped with SRAM IC6A that stores the printing mode character pitch and TOF top of form position set using the control panel The memory back up circuit is on the PEGX board so that the settings can be maintained even when the printer power is turned off A lithium battery is used to back up the memory Figure 2 32 shows the memory back up circuit 024 A1015 5V ST RAM HM6264 6A SS 25 208 Gel HZS3 ONBZ R77 150 R76 560 1 l 17335 Figure 2 32 Memory Back up Circuit R79 150 Qnm ie When the power is turned on under normal conditions 5V is applied to Vcc of the RAM and the CPU starts reading and writing When the power is turned off and the voltage on the 5V line decreases to about 3 0V transistors 024 and 025 are switched off and the voltage from the external lithium battery is applied to the Vcc terminal The data in the static RAM is therefore maintained Table 2 6 lists the static RAM conditions when the power is on or off Table 2 6 ST RAM Conditions 5V Line 2 38 REV A 2 3 4 5 Printer Error Detection The printer has a function that detects various errors and informs the
57. signals represent information of the 1st to 8th bits of parallel data respectively Each signal is at HIGH level when data is logical 1 and LOW when logical O This pulse indicates data has been received and the printer is ready to accept more data Pulse width is approximately 12 A HIGH signal indicates that the printer cannot receive data The signal becomes HIGH in the follow ing cases 1 During data entry 2 During printing operation 3 In off line status 4 During printer error status A HIGH signal indicates that the printer is out of paper Pulled up to 5V through 3 3 ohms resistor With this signal at LOW level the paper is automati cally fed one line after printing The signal level can be fixed to LOW with DIP SW 2 4 Not used Logic GND level Printer chassis GND In the printer the chassis GND and the logic GND are isolated from each other Not used TWISTED PAIR RETURN signal GND level When the level of this signal become LOW the printer controller is reset to its initial state and the print buffer is cleared This signal is normally at HIGH level and its pulse width must be more than 50 5 at the receiving terminal The level of this signal becomes LOW when the printer is in 1 Paper out status 2 Off line status 3 Error status 1 14 b me REV A Table 1 17 Connector Pin Assignments and Si
58. 0 61 64 6A 75 73 74 60 65 6E Micro adjustmen OOZA 74 OD OA 20 20 20 2 20 53 65 65 63 54 tcs X SelecT OO2B 79 70 65 20 66 75 6E 63 74 69 6F 6E 20 28 41 6E ype function An OO2C 7 20 70 7269 6E 74 20 6D 6F 64 65 20 63 61 6E print can 0020 20 62 65 20 72 65 6C 6 5 6 3 74 65 64 20 64 69 72 be selected dir 2 65 63 74 79 20 66 72 6F 20 74 68 65 20 66 fromthe OO2F 72 6E 74 OD OA 20 20 20 20 20 70 61 6E 43 6C rent panel 0030 29 2E 20 20 4F 6E 6 3 65 20 61 20 6r 64 65 20 Once e mode 0021 69 77 20 72 65 C 65 63 74 69 64 2C 20 89 74 20 is sel ected it 0052 69 72 20 77 74 6F 72 65 64 20 69 6E 20 74 48 65 is stored in the 0033 20 E 6F 2D 76 6F C 61 74 69 6 65 20 4D 65 non volatile me 0024 6D 6F 72 79 2C OD OA 20 20 20 20 20 41 6E 64 20 mory end 0025 69 73 20 73 65 65 63 74 65 64 20 77 68 65 6E is selected when 0058 20 74 68 65 20 70 72 69 74 65 72 20 70 6r 77 the printer 0037 65 72 20 69 73 20 74 75 72 6E 65 64 20 6E 2E er is turned on 0038 OA OA 20 20 20 2 20 54 77 6F 20 4E 4C 51 Two 0059 20 66 OF 6E 74 73 20 28 52 6F 4D 61 6E 20 61 fonts Romanen OOTA 64 20 52 61 6E 73 2D 77 65 72 69 66 29 20 61 72 d Sans seri f er 00751 6520 72 74 61 6E 64 61 72 64 2E OD OA OD OA 20 e standard Figure 1 9 Hexadecimal Dump Printing 1 20 REV A 1 7 PRINTER INITIALIZATION There are two initialization methods hardw
59. 0 mm 9 13 8 0 0 0 0 0 0 0 0 Printable 0 0 area 0 0 hac xval 0 0 36 0 0 more ERROREM 0 0 0 35 9mm o 0 or more 0 o 0 0 ije Printable 0 0 0 0 0 0 0 0 0 0 NOTE 1 Values in the parentheses apply to 1050 2 0 47 12 mm or more when the 101 to 242 mm 4 to 9 5 width paper is used 0 98 25 mm or more when the 254 mm 10 width paper is used Figure 1 4 Fanfold Paper Printable Area Envelopes Size No 6 166 X 92 mm No 10 240 X 104 mm Quality Bond paper xerographic copier paper airmail paper Thickness 0 16 0 52 mm 0 0063 0 01 97 NOTE Differences in thickness within printing area must be less than 0 25 mm 0 0098 Weight 121 241 Ib 45 91 g m NOTES 1 Envelope printing is only available at normal temperature 2 Keep the longer side of the envelope horizontally at setting 3 Set the left of No 6 envelope at the setting mark of the sheet guide Label Size 2 1 2 X 15 16 4 X 15 16 4 X 1 7 16 Thickness O 19 mm 0 0075 max NOTE Thickness excluding the base paper must be less than or equal to 0 12 mm 0 0075 1 7 REV A NOTES 1 Printing of labels is only available at normal temperature f 2 Labels must be fanfold 3 Labels with pressure sensitive paper must be jointed by pasting along the dots or lines and the total thickness must be less than or equal to 0 3 mm 1 1 8 to be pri
60. 0mA 600mW X300145009 010 12 25 3748 60 10 302374809 011 25 3746 60 5A 302374609 013 25 765 120 1 5W 301 076530 015 25 1318 100V 1 2W x301131809 017 250560 4 120 5A 1 5W 303056009 018 021 2SC18 15 60V 150mA 400mW 302181589 022 025 030 2SA10 15 50V 150mA 400mW x3 0 0101 509 1023 024 A 1 1 CPU KPD7810HG f The amp PD78 10 781 1 is an 8 bit CPU and includes two 8 bit timer counters an 8 bit A D converter 256 bytes of RAM and a serial interface A system can be easily constructed using this IC The main features of this IC are as follows 256 bytes built in RAM addresses FFOOH FFFFH 4096 bytes maks ROM addresses O FFOOH for the 7811 CPU Direct addressing of up to 64K bytes 8 bit A D converter 158 instructions 0 8 us instruction cycle 15 MHz 16 bit event counter Two 8 bit timer counters external and 8 internal interrupts 6 priority levels and 6 interrupt addresses General purpose serial interface asynchronous synchronous 1 0 modes line 781 1 40 bit 1 0 port 78 10 24 bit edge detection 4 inputs Zero corss detection Standby function Built in clock pulse circuit NMOS Figures A 1 and A 2 illustrate the 78 10 781 1 HG microprocessor and Tables A 3 through A 6 describe its functions 1 2 3 4 5 6 7 8 9 Figure A 1 KPD7810 7811 Pin Diagram
61. 1 When the voltage at pin 4 becomes higher than that at pin 5 over voltage AMP 1 outputs current modulated by pulse width modulation PWM to reduce the output voltage of the circuit PWM is described below OUTPUT V VREF Voltage Under Voltage Over Voltage Normal Voltage R20 14 3 3 1 OUT PUT Figure 2 20 Constant Voltage Figure 2 21 AMP 1 Output Control 5 VDC R 108 and C35 compensate for phase lag in the error amplifier to prevent abnormal oscillation 2 22 REV A 2 3 2 7 24 VDC Regulator Circuit Figure 2 22 shows the 24V regulator circuit The 24VDC regulator circuit has almost the same function and employs the same oscillation circuit as the 5V VDC regulator circuit Here the error amplifier AMP 2 is used for over current control and AMP 3 for constant voltage control The operation of the error amplifier AMP 3 is as follows EO5A 16GA 015 Figure 2 22 24 Regulator Circuit 2 23 REV A The negative terminal of AMP 3 receives Vrer 5V H Consequently the voltage applied to the positive terminal is adjusted to 5V Therefore based on Figure 2 23 the output voltage is set to the following value Nw R6 R2 29V ohms 9 1 ohms 2 4K ohms 2 4 23 96 OUTPUT VREF Voltage R6 R17 R1 3 3 3K PAR R2 2 4K EN UN Figure 2 23 Constant Voltage Control 24 VDC AMP 2 operates as follows for over current control 24 V is
62. 1 T3 the OP code fetch for these two signals is performed at T4 The WR signal is output from the middle of T 1 to the beginning of T3 The address and ALE timing is the same as that for memory read however following address output AD7 0 PD7 0 are not disabled and write data is output at AD7 O at the beginning of T 1and the end of T3 NOTE When PD7 0 are set to the multiplexed address data bus AD7 O to the address bus 7 0 the RD and WR signals in the machine cycle are HIGH when memory is not being accessed ALE 815 E O ADDRESS 07 gt Y ADDRESS int PD7 O ADDRESS lt lt B uma Figure A 3 OP Code Fetch Timing Ti T2 CLOCK ann 7 15 8 PF7 0 OX o PD7 0 X ADDRESS lt READ DATA RO Figure A 4 Memory Read Timing 11 2 CLOCK ALE 15 8 7 0 ADDRESS AD 0 J Ph 0 ADDRESS X WRITE DATA Y WR ar Figure A 5 Memory Write Timing A 6 any REV A A 1 2 Gate Array E05A15HA The E05A 15 is a custom gate array used for address latching address decoding and automatic phase switching between two channels and to control head data buffering The features of this gate array are as follows Latches the low order address for the gt 87 series using the ALE signal
63. 123456789 8ABCDEFGHIJKLMNOPQRSTUVWXYZTNI gt abcdefghijklmnoparstuvwxy amp 0123456789 z 7 ABCDEFGHIJKLMNOPQRSTIVWXY20 1_ _fahi ikimnopgrstuvwxyz SX amp 0123456789 lt gt ABCDEFGHIJKLMNOPQRSTUVWXYZ _abcdefghijklmnoparstuvwxyz amp 0123456789 lt gt ABCDEFGHIJKLMNOPQRSTUVWKY Z _abcdefghijkimnoparstuvwxy2 i amp 0123456789 lt gt 7 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghisklmnopgrstuvwxyz i amp 0123456789 lt gt ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijkimnopgrstuvwxyz 0123458789 gt 7 ABCDEFGHIJKLMNOPQRSTUVWXYZI _ abcdefghijklmnoparstuvwxyz 0123456789 lt gt ABCDEFGHIJKLMNOPQRSTUVWXYZ _abcdefghijkimnopgrstuvwxyz 0123456789 3 lt gt 7 ABCDEFGHIJK LMNOPQRSTUVWXYZ _abcdefghijklmnoparstuvwxyz i NLQ Roman Mode 8 7 amp K 012345678915 lt gt ABCDEF GHIJ KLMNOPGQRS TUVWXYZ _ abcdetfghijk lmnopaqr stuvwx 48 78 amp 04 9 0123456789 lt gt 2 0 ABCDEFGHIJKLMNOPORS TUVWXYZ N1 _ abcde fghijklmnoparstuvwxy 8 amp 4 0123456789 lt gt GSABCDEF GHIJKLMNOPORSTUVWXYZLN abcde fghiikimnopor stuvwxy 2 9 amp 0123 4567 B89 3 lt gt ABCDEFGHIJ KLMNOPOQRSTUVWXYZE _ abcdefghijkimnoparstuvwxy z 5 amp 012345 amp 789 lt gt 7 ABCDEFGHIJ KLMNOPGQRSTUVWXY ZE abcdefghijklmnopqrstuvwxyz
64. 13 12 11 10 9 64K bytes 4 T NUN REV A Table A 6 u PD781 0 781 1 Port Functions Pin Sginal Direction Descriptions 1 8 PAO 7 In Out Port A Eight bit I O with output latch I O possible by mode A MA register Output HIGH 9 16 PBO 7 In Out Port B Eight bit 1 O with output latch I O possible by mode B MB register Output HIGH 17 24 PCO 7 In Out Port C Eight bit O with output latch Port Control mode can be set by mode control C MCC register Output HIGH 25 NMI Non maskable interrupt of the edge trigger trailing edge 26 INT 1 Maskable interrupt input of the edge trigger leading edge Also used as the AC input zero cross detecting terminal 27 29 MODE 1 0 In Out 7811 O LOW and 1 HIGH 7810 modes set in accordance with external memory see Table A 2 28 RESET In LOW reset 30 31 X2 X1 Crytal connection for built in clock pulse When clock pulses are supplied externally input must be to X 1 32 Vss 2 Supply voltage Vss OV 33 AVss Analong Vss 34 41 ANO 7 Eight analog inputs of the A D converter AN7 4 can be used as the input terminals to the detect the leading edge and to set the test flag upon detection of the trailing edge 42 VAref o Reference voltage 43 AVcc Analog Vcc 44 RD Read strobe LOW at the read machine cycle and at reset HIGH at other times 45 WR Write strobe LOW during the write machine cycle and at reset HI
65. 2 shows a schematic drawing of the power transformer PRIMARY SECONDARY PRIMARY ONDAR 120 240 ORANGE red 27 6 VAC 27 6 VAC red BROWN red 220 vac 50 60 Hz 50 60 blue blue 8 3 VAC 8 3 WHITE BLUE blue Ov TF IZOV version 220 240 V Version Figure 2 12 Transformer Circuit 2 16 REV A 2 3 2 3 Rectifier and Smoothing Circuit The 26 VAC from the secondary coil of the transformer are full wave rectified by diode bridge DB 1 and converted to approximately 36 VDC by smoothing capacitor C 1 The 24 VDC and 5 VDC voltages are converted from this DC voltage which is used as the power supply voltage for the switching regulator IC at the next stage CN 10 1 AC 1 26 VAC CN 10 2 1 Figure 2 13 Rectifier and Smoothing Circuit REV A E 2 3 2 4 Chopper Type Switching Regulator Circuit chopper type switching regulator is employed in the power supply circuit Operation of the step down circuit is as follows ton AY 22 Figure 2 14 Step Down Circuit Figure 2 14 shows the chopper type step down switching regulator circuit When the transistor is ON voltage Vi is applied to coil L and capacitor C and load current IL flows At this time electromagnetic energy WL is accumulated in choke coil L When the transistor turns off WL is applied to the load via flywheel diode D so that output voltage Vo becomes the average value Vo vix
66. 350 351 352 400 401 402 403 450 500 501 502 503 504 505 507 508 509 510 512 513 514 514 516 517 518 519 520 521 522 LOWER CASE PRINTER COVER A PRINTER COVER B SHEET GUIDE COVER SHEET GUIDE ASSEMBLY BASE PLATE UPPER CASE SIDE COVER LOGO PLATE GROUND PLATE PLATEN KNOB SHIELD PLATE RUBBER FOOT C B B SCREW C B B SCREW C B B SCREW C B B SCREW C B B P SCREW C P S 0 SCREW 0 SCREW C B S O SCREW C B P SCREW PEGX BOARD UNIT HEAT SINKER HEAT SINKER INSULATOR TRANSISTOR HOLDER C C S SCREW C C S SCREW C C S SCREW PEBFIL II BOARD UNIT FUSE PEBFIL II BOARD UNIT FUSE PEBFIL II BOARD UNIT FUSE POWER TRANSFORMER POWER TRANSFORMER POWER TRANSFORMER POWER CABLE POWER CABLE POWER CABLE POWER CABLE PGPNL BOARD PRINTER MECHANISM M 3B 10 FRAME LEFT PAPER HOLDING LEVER LEFT FRAME RIGHT PAPER HOLDING LEVER RIGHT CARRIAGE MOTOR M3X8 M3 xX 10 12 12 4 25 M3 x6 M4 8 M4 8 M3 x8 M38 1 010 M395 050 M38 1 020 M903 1080 M3 X 12 M3 X 16 M3 x 10 120V 125V 2A 220V 240V 250V 1 25A 100V 125V 2A 120V 220V 240V 220V 240V 240V 240V CARRIAGE MOTOR MOUNTING PLATE C P S 0 SCREW BELT DRIVEN PULLEY ASSEMBLY RIBBON DRIVE ASSEMBLY FLUCTION TRACTOR SENSOR CARRIAGE UNIT PLUNGER ASSEMBLY PAPER GUIDE UNIT PAPER END SENSOR PAPER FEED ROLLER ASSEMBLY M3 X 6 PAPER HOLDING ROLLER A
67. 3B 10 3B60 printer mechanism PEGX board main board PGPNL board control panel PEBFIL II board filter board and power transformer Housing Figure 1 11 shows the FX 850 1 050 component locations Power Transformer PEBFIL II Board PEGX Board Paper Tension Unit Paper Feed Motor ET Dis c 24 B 2 1 Printhead __ e 5 e Carriage Motor NOTE In FX 850 the paper tension unit and push tractor unit are excluded Figure 1 11 Component Locations 1 25 REV A 1 11 1 Printer Mechanism d The Model 3B 10 FX 850 3B60 FX 1 050 are 9 pin dot matrix printer mechanisms and feature a wide range of usable paper light weight compact size and advanced paper handling function These mechanisms are based on printer mechanisms Model 53 10 5360 for the LO 850 1 050 The optional pull tractor unit or cut sheet feeder can be mounted to the mechanism Since the construction of these printer mechanisms are simplified maintenance is very easy Figure 1 12 Model 3B10 FX 850 Figure 1 13 Model 3B60 1050 1 26 REV A 1 11 2 PEGX Board Main Board The PEGX board is the main board and interfaces the printer to the host computer controls the printer mechanism and control panel and supplies DC voltage Since the complicated logic circuit section is implemented using gate arrays the PEGX board features very compact construction Driver circuits for
68. 5 the menu mode displays all test file names in the system from which a user can select the file to be executed If a file number is input the description of the test file is displayed on the screen and executed The results indicating the suspected parts are displayed In addition since this mode enables the user to input a signal from the control panel an access is provided that is not normally available Refer to the display messages for information on the control panel operation in the diagnostics mode To return the main menu press the return key 5 4 CST REV A 2 Auto File Mode 3 This mode is selected by choosing No 2 on the menu screen and is used to run all of the printer checks sequentially All of the files shown in Figures 5 5 are executed This mode is useful in the following cases When the cause of the problem can not be determined When a final check is performed When a check is performed by the user without electronic or mechanical background After the unit has been repaired This mode can be used to find a malfunctioning part without using specific instruments such as an oscilloscope Auto Mode with Oscilloscope This mode is selected by choosing No 3 on the menu screen and is used to identify malfunctions in conjunction with an oscilloscope This mode can be used when repair is undertaken by a user who is familiar with oscilloscope operation or when checking specific parts needing
69. 5A15HA Function for Paper Feed Motor 2 54 Figure 2 45 Phase Excitation 2 54 Figure 2 46 Paper Loading Ejecting Operation 2 57 Figure 2 47 Plunger Mechanism 4104 2 58 Figure 2 48 Plunger Drive Circuit 0 444 4 2 58 Figure 2 49 Relationship Between Transistors Plunger 2 59 Figure 2 50 Printhead Central Circuit Block Diagram 2 60 Figure 2 51 Print Drive Pulse Width seen 2 61 Figure 2 52 Half dot Protection Circuit seen 2 62 LIST OF TABLES Table 2 1 Board Connector Summary 2 2 Table 2 2 Power Supply Application 2 11 Table 2 3 Pin Function of CPU iiiaio tarirani 2 27 Table 2 4 Pin Function fo GA E05A15HA 2 29 Table 2 5 Pin Function of 0 16 2 31 Table 2 6 ST RAM Conditions 1 0 0 2 38 Table 2 7 2 2 phase Excitation asair 2 46 Table 2 8 1 2 phase 4 n n wn 2 46 Table 2 9 Carriage Speed Modes 2 49 Table 2 10 Acceleration Deceleration
70. AME AS THE RATED VOLTAGE LISTED ON THE SERIAL NUMBER RATING PLATE IF THE EPSON PROD UCT HAS A PRIMARY AC RATING DIFFERENT FROM THE AVAILABLE POWER SOURCE DO NOT CONNECT IT TO THE POWER SOURCE 3 ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND OR INDIVIDUAL CHIPS 4 IN ORDER TO PROTECT SENSITIVE P CHIPS AND CIRCUITRY USE STATIC DISCHARGE EQUIPMENT SUCH AS ANTI STATIC WRIST STRAPS WHEN ACCESS ING INTERNAL COMPONENTS 5 REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS RECOMMENDED BY THE MANUFACTURER INTRODUCTION OF SECOND SOURCE ICS OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY REV A TABLE OF CONTENTS CHAPTER 1 GENERAL DESCRIPTION CHAPTER 2 OPERATING PRINCIPLES CHAPTER 3 OPTIONAL EQUIPMENTS Intentionally omitted at this time CHAPTER 4A DISASSEMBLY ASSEMBLY AND ADJUSTMENT CHAPTER 5 TROUBLESHOOTING CHAPTER 6 MAINTENANCE APPENDIX vi 1 oa GENERAL DESCRIPTION lt 1 1 FEATURES ie a re Ph VNE een xt ERR OE 11 5 122 SPECIFICATIONS winnie 1 3 1 2 1 Hardware Specifications eee 13 1 2 1 Firmware Specifications ees 4 10 1 3 INTERFACE OVERVIEW winter 1 12 1 3 1 8 bit Parallel Interface Specifications 1 12 1 4 DIP SWITCHES AND JUMPER SETTING 1 17 1 4 1
71. Control System The carriage motor speed is controlled by the printer firmware Various types of characters NLQ Near Letter Quality Draft and condensed can be printed by controlling the print and paper feed mechanisms and the carriage motor speed The printer has the six speed modes shown in Table 2 9 Table 2 9 Carriage Speed Modes Description Draft ESC K ESC Y ESC 6 Draft half emphasis NLO ESC L ESC Z ESC 4 ESC 7 emphasis condensed NLQ Condensed Double height Note The carriage speeds and number of PPS pulse per second for the 1 2 phase excitation system are transformed into these for the 2 2 phase excitation system Speed Control Since a stepper motor is used as the carriage motor holding at any position and reversing the printing direction are possible The carriage motor control uses an open loop system and the carriage position is synchronized with the phase switching by the firmware Acceleration constant speed and deceleration control is performed as described below Acceleration control The carriage motor is accelerated in accordance with the acceleration time table The acceleration time varies depending on the speed mode Table 2 10 shows the differences between the speed modes Table 2 10 Acceleration Deceleration Control m Acceleration Speed Mode Carriage Speed Phase Excitation Deceleration Constant Speed pps ins step 3840 0 286 REV A Constant Speed Control
72. D ON REPLACE IC7A YES FINISH IC7C INITIALIZE PAPER OUT LED ON REPLACE YES FINISH INITIALIZE NO READY LED ON poss FINISH 4 INITIALIZE YES REPLACE IC4B ONLINE LED BLINKS REPLACE IC5A RAM ERROR NO 5 PAPER OUT LED BLINKS REPLACE IC6A RAM ERROR NO 5 READY LED BRINKS gt _ REPLACE IC4B RAM ERROR NO BUZZER 5 YES REPLACE IC7A READ DIP SWITCHES Perform Function IF DIP SW1 then stop 5 7 REV A If you want to test the printer without a host computer then set dip SW as follow f Table 5 2 Off Line Diagnostics DIP SW1 FUNCTION OOH RAM Check amp CPU check OIH Address Data line Hi Lo 02H Home position sensor check 03H Paper end sensor check 04H F T sensor check F T Friction Tractor 05H Control panel SW check 06H Head drive Transistors short circuit check 07H Head drive voltage 24 check 08H Motor drive voltage Vu check 09H Paper feed motor phases output OAH Carriage motor phases output _ OBH Plunger solenoid On Off OCH Plunger drive voltage change drive hold ODH Paper feed motor drive voltage change drive hold OEH Plunger enable line change disable enable OFH Interface control line Hi Lo 10H Carriage motor current change line Hi Lo 11H All selecType LED On OFF 5 2 7 Programmer Tips 1 If you are lost in
73. E 240V POWER CABLE 240V POWER CABLE 240V PGPNL BOARD PRINTER MECHANISM M 3B 10 FRAME LEFT PAPER HOLDING LEVER LEFT FRAME RIGHT PAPER HOLDING LEVER RIGHT CARRIAGE MOTOR CARRIAGE MOTOR MOUNTING PLATE C P S 0 SCREW M3x6 BELT DRIVEN PULLEY ASSEMBLY RIBBON DRIVE ASSEMBLY FLUCTION TRACTOR SENSOR CARRIAGE UNIT PLUNGER ASSEMBLY PAPER GUIDE UNIT PAPER END SENSOR PAPER FEED ROLLER ASSEMBLY PAPER HOLDING ROLLER ASSEMBLY TRACTOR FRAME TRACTOR SHAFT TRACTOR ASSEMBLY LEFT ASSEMBLY RIGHT A 33 Ref No 523 524 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 544 545 546 547 548 549 550 551 552 533 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 580 581 582 583 584 585 586 587 588 589 590 591 592 Description PAPER SUPPORT TRACTOR GEAR TRACTOR UNIT COVER SPROCKET GUIDE SHAFT PAPER TENSION UNIT PAPER TENSION FRAME RIGHT PAPER TENSION ROLLER SHAFT ASSEMBLY PAPER TENSION SUPPORT ROLLER SHAFT PAPER TENSION ROLLER TRANSMISSION GEAR PAPER TENSION SUPPORT ROLLER PAPER TENSION UNIT COVER PAPER TENSION LOCK LEVER PAPER TENSION FRAME LEFT PRINT WHEEL SHAFT HOLDER PAPER GUIDE LABEL BASE FRAME CARRIAGE GUIDE SHAFT B HEAD ADJUSTMENT LEVER CARRIAGE GUIDE SHAFT B HEAD ADJUSTMENT BUSH PARALLEL ADJUSTMENT BUSH HEAD CABLE HOLDER HOME POSITION S
74. ENSOR CABLE DAMPER DAMPER SPACER TRANSPORT LOCKING BRACKET HEAD CABLE GUIDE OIL PAD RIBBON MASK TIMING BELT TIMING BELT TENSION SPRING CARRIAGE MOTOR MOUNTING PLATE BUSH PLATEN COVER PAPER GUIDE PLATE PAPER FEED MOTOR PLATEN SHAFT HOLDER PLATEN PLATEN GEAR PAPER FEED REDUCTION GEAR TRACTOR REDUCTION GEAR TRACTOR REDUCTION GEAR SPRING PAPER RELEASE LEVER SUB PAPER RELEASE LEVER PAPER FEED SPRING PAPER HOLDING LEVER SPRING LEFT PAPER HOLDING LEVER SPRING RIGHT PAPER GUIDE PLATE SPRING 168 410 HOME POSITION SENSOR CARRIAGE SHAFT A PLAIN WASHER 8X0 5 X 15 LEAF SPRING 8 2 X0 2X 15 EAF SPRING 8 2x O 15 X 15 gt P S 0 SCREW M3X 10 gt P S 0 SCREW M3x8 gt P S P SCREW M3X 10 gt B N S SCREW M3xX6 NUT WITH OW M4 RETAINING RING TYPE E 2 3 RETAINING RING TYPE E 3 RETAINING RING TYPE E 4 RETAINING RING TYPE E 5 LAIN WASHER 5 XO 3X 10 EAF SPRING 6 XO 15 X 11 3PRING PIN 2x 14 BAND SKB 1M 1111 CLAMP REV A Figure A 23 FX 1050 Exploded Diagram 1 A 34 5 9 REV A Figure A 24 FX 1050 Exploded Diagram 2 A 35 REV A Figure A 25 FX 1050 Exploded Diagram 3 A 36 Table 27 FX 1050 Description 100 101 102 103 104 105 106 107 108 109 111 112 115 116 117 118 119 120 121 122 123 124 200 201 202 204 205 206 207 208 300 301 310 311 320 321
75. ENT REQUIRED When the paper feed motor is replaced or the fixing screws are loosened perform the following adjustment 4 3 2 Paper Feed Motor Gear Backlash Adjustment 4 20 REV A 4 2 5 8 Friction Tractor Sensor Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Position the paper release lever at its back setting Step 3 Remove the paper feed motor Refer to Section 4 2 5 7 Step 4 Remove the CPS P 3 X 10 screw securing the friction tractor sensor to the side frame R then remove the sensor f Paper Release Lever CPS P 3 x 10 Side Frame R Friction Tractor Sensor Figure 4 27 Friction Tractor Sensor Removal ASSEMBLY POINT Make sure of the sensor direction and set in place before mounting the friction tractor sensor on the side frame R 4 21 REV A 4 2 5 9 Plunger Removal Step 1 Remove the printer mechanism Step 2 Remove the RE 3 and disconnect loading lever of the plunger from the paper holding lever L Step 3 Remove two CPS 0 3 X 6 screws which secure the plunger to the side frame L then remove the plunger Paper Holding lever Plunger Loading Lever Figure 4 28 Plunger Removal ASSEMBLY POINTS 1 Mount plunger on side frame L by tightening the two CPS 0 3 X 6 screws lightly 2 Set loading lever onto paper holding lever L and put on RE 3 3 Hold the pulnger and cylinder as shown in Figure 4 29 and po
76. FX 850 1050 TECHNICAL MANUAL EPSON All rights reserved Reproduction of any part of this manual in any from whatsoever without SEIKO EPSON S express written permission is forbidden The contents of this manual are subject to change without notice All efforts have been made to ensure the accuracy of the contents of this manual However should any errors be detected SEIKO EPSON would greatly appreciate being informed of them The above notwithstanding SEIKOEPSON can assume no responsibility for any errors in this manual or the consequences thereof Copyright 1988 by SEIKO EPSON CORPORATION Naga no Japan REV A PREFACE This manual describes functions theory of electrical and mechanical operations maintenance and repair of the FX 850 and FX 1050 The instructions and procedures included herein are intended for the experienced repair technician and attention should be given to the precautions on the preceding page The chapters are organized as follows Chapter 1 Provides a general product overview lists specifications and illustrates the main components of the printer Chapter 2 Describes the theory of printer operation Chapter 3 Discusses the options Chapter 4 Includes a step by step guide for product disassembly assembly and adjustment Chapter 5 Provides Epson approved techniques for troubleshooting Chapter 6 Describes preventive maintenance techniques and lists lubricants an
77. GA Port Functions Pin No Signal Name Direction RSTIN 1 RSTIN IN7 2 Function Multiplex tri state data bus bit 4 7 The data is output when RD signal is low RXD signal input port Reset signal input No 1 RSTIN 1 signal is output to RSTOUT signal port Ground Reset signal input No 2 RSTIN 2 signal is output to RSTOUT signal port Parallel data input port The data from the host computer is latched when the strobe signal is input Strobe signal input port The parallel data from host computer is latched by STRB signal Parallel data input port The data from the host computer is latched when the strobe signal is input Busy signal output port Acknowledge signal output port 22 OUT Paper end signal output port OUT 23 24 OUT j 27 8 2 29 PD1 OUT 30 PDO 31 IN input Error signal output port output port RXDOUT OUT Serial data output port output port port 5 Input port out output port output port Input port Address input port low address bit O 2 A 15 REV A Table 9 GA E05A16GA Port Functions cent d Pin No Signal name Direction Function 57 Cs IN Chip select signal 58 RD IN Read strobe signal 59 WR IN Write strobe signal 55 DBO Multiplex tri state data bus bit 0 3 f f IN OUT The data is output when RD signal is low 63 DB3 64 VDD IN 5V NOTE1 Direction refe
78. GH at other times 46 ALE Address latch enable Latches the lower 8 address bits to access external memory 47 54 PFO 7 Port F 78 1 1 Port bit by bit I O possible by mode F register In extension mode gradual address output assignment is possible in accordance with the size of external memory See Table A 3 78 10 By setting modes O and 1 assignment to the address bus AB 15 8 can be made in accordance with the size of the external memory The remaining terminals can be used as ports See Table 4 55 62 PDO 7 Port D 781 1 Port bit by bit 1 0 possible In extension mode PD7 0 act as the multiplexed address data but AD7 0 78 10 Multiplexed address data bus to access external memory 63 VDD Supply voltage Voo sv 64 Vcc Supply voltage Vcc sv NOTE Direction refers to the direction of signal flow as viewed from the CPU REV A CPU Timing Refer to Figures A 3 through A 5 for CPU timing diagrams Three oscillations define one state The OP code fetch requires four states during TI to T3 program memory is read instructions are interpreted during T4 Address bus lines 15 8 output from T 1to T4 Address but lines 7 O PD7 O are used in the multiplex mode the address is latched during T1 at the ALE signal Since the memory addressed is enabled after disengaging the driver AD7 0 RD is output from T 1 T3 fetched at T3 and processed internally at T4 The ALE and RD signals are executed from T
79. L oe a eal ef iecit most e eR 2 1 2 1 1 Cable Connections iere 2 1 2 2 PRINTER MECHANISM OPERATION _ 2 3 22 4 Printhead 2 2 2 4 E 2 2 2 Carriage 0 4 2 1 124 2 5 B 2 2 3 Home Position 2 2201 1 0 1 2 5 o 2 2 4 Ribbon Feed Mechanism oui 2 6 2 2 5 Paper Feed Mechanism emn 2 7 2 2 5 1 Push Tractor Feeding 2 8 2 2 5 2 Friciton Feeding Method 2 9 2 3 CIRCUIT OPERATION eriiic ere e E ERR SG 2 10 2 3 1 General Information 2 eene 2 10 2 3 1 1 Power Supply Section 4 2 10 2 8 1 2 Control Circuit Section 3 2 12 2 3 1 3 Memory Mapping 2 14 2 3 2 Power Supply Circuit 444 4 2 15 2 3 2 1 Filter Circuit ences 2 16 2 3 2 2 Transformer ES A pea 2 16 2 3 2 3 Rectifier and Smoothing 2 17 2 3 2 4 Chopper Type Switching Regulator Circuit 6 04 444 2 18 2 3 2 5 Pulse Width Modulation Circuit 2 19 2 3 2 6 5V Regulator Circuit 2 21 2 3 2 7 24V Regulator Circuit
80. Paper End signal 25 PC2 OUT Buzzer control signal 2 Plunger solenoid ON OFF control signal 27 PCO OUT Carriage motor control signal 28 me eeu d RXD Signal output 2 Carriage motor Power down signal 30 PO 24V DC control signal 31 P0 N FONT switch control panel status monitor 32 VDD ON Power source 33 PA1 O N PITCH switch control panel status monitor 34 PA2 O N CONDENSED switch control panel status monitor 35 Vss Logic ground 2 31 REV A Table 2 5 Pin Function of GA E05A16GA cent d Pin No Signal Name 36 4 37 PC5 38 PC6 39 PC7 40 PBO 2 A N 79 A 79 n A 46 6 Direction OUT OUT OUT Function PAPER OUT LED ON OFF Control Signal READY LED OFF control signal ON LINE LED ON OFF control signal Not used DRAFT LED ON OFF control signal ROMAN LED ON OFF control signal SANS SERIF LED ON OFF control signal 10 CPI PICA LED ON OFF control signal 12 CPI ELITE LED ON OFF control signal PS PROPORTIONAL LED ON OFF control signal CONDENSED LED ON OFF control signal Not used Logic ground LINE FEED switch FORM FEED switch LOAD EJECT switch Not used Address bit AO A2 Chip Select signal input Read strobe signal Write strobe signal Input Output data bus DO D3 Power source NOTE Direction on the signal flow is as viewed from the gate array 2 32 am C
81. R motor phase drive CR motor phase A drive pulse CR motor phase B drive pulse CR motor phase B drive Reference voltage for CR motor phases 2 3 4 5 6 7 8 9 5V DC internal circuit power GND e Not connected CR motor phase C drive CR motor phase C drive pulse CR motor phase D drive pulse CR motor phase D drive CR motor phases C and D common Power down Fixed to low A 25 REV A A 2 EXPLODED DIAGRAMS AND SCHEMATICS Figure A 1 7 through A 27 are exploded and schematic diagrams BUZZER GNO ON LINE SW FORM FEED SW LINE FEED SW LOAD EJECT SW DRAFT SW PICA SW CONDENSED SW ON LINE LAMP READY LAMP PAPER OUT LAMP DRAFT LAMP ROMAN LAMP SANS SERIF LAMP PICA LAMP ELITE LAMP PS LAMP CONDENSED LAMP 5V PGPNL BOARD Conirol Panel Y461 501000 Figure A 1 7 PGPNL Board Circuit Diagram A 26 shes Hg 120 12 4 20 EO5A15AA 15HA 22 3333 on 3328 5 38 gt ER lt B ob 0 J2 2 oc PD 7BIOHG Q a C36 9 8 198 gto y 8 4F 122 gt vy 4b e 25 522444205 206 om GHI 25 REDOM A PEGX BOARD C34 3 200 UOU R75 R70 1 vs F 1 FE 95 gt n s o amp UE i 33 A 5 33 38 gt a NNN N E RN n RM 2 2 E
82. RING PAPER HOLDING LEVER SPRING LEFT PAPER HOLDING LEVER SPRING RIGHT PAPER GUIDE PLATE SPRING 168 410 HOME POSITION SENSOR CARRIAGE SHAFT A PLAIN WASHER 8 5 X 15 LEAF SPRING B 2 XO 2X 15 LEAF SPRING 8 2 15 X15 C P S 0 SCREW M3x 10 C P S 0 SCREW M3 X8 C P S P SCREW M3x 10 C B N S SCREW M3x6 HEXAGON NUT WITH OW M4 RETAINING RING TYPE E 2 3 RETAINING RING TYPE E 3 RETAINING RING TYPE E 4 RETAINING RING TYPE E 5 PLAIN WASHER 5 XO 3 x 10 EAF SPRING 6x0 15X 11 SPRING PIN 2x 14 WIRE BAND SKB 1M MINI CLAMP REV A Figure A 26 FX 850 Case Outline Drawing A 38 REV A A e E 150 176 Figure A 27 1 050 Case Outline Drawing A 39 EPSON SEIKO EPSON CORPORATION BUSINESS amp INDUSTRIAL INSTRUMENT DIVISION EPSON OVERSEAS MARKETING LOCATIONS EPSON AMERICA INC 2780 Lomita Blvd Torrance Calif 90505 U S A Phone 21 3 539 9 40 Telex 182412 EPSON DEUTSCHLAND GmbH Z lpicher Stra e 6 4000 D sseldorf 11 F R Germany Phone 02 11 56030 Telex 8584786 EPSON UK LTD Dorland House 388 High Road Wembley Middlesex HA9 6UH U K Phone 01 902 8892 Telex 8814169 EPSON FRANCE S A 114 Rue Marius Aufan 92300 Levallois Perret France Phone 1 47 573133 Telex 610657
83. Ribbon Cartridge and Platen Knob Removal 2 Slide the printhead to the middle of the printer Then using a cross head screwdriver reattach the two transport locking brackets Figure 4 3 Transport Locking Brackets Installation REV A Attach the left and right locking tabs e Figure 4 4 Locking Tabs Installation and insert the print head protector as shown below Slide the print head all the way to the left Figure 4 5 Printhead Protector Installation 4 4 REV A 4 2 DISASSEMBLY AND ASSEMBLY Components of the 8501 050 may be assembled simply by performing the disassembly operation in reverse sequence Assembly procedures therefore have been omitted The sequence of this disassembly in this section is grouped into three parts 1 removal of the upper case 2 removal of the circuit boards and 3 disassembly of the printer mechanism This sequence is shown in Figure 4 6 Section 4 2 2 Control Panel Removal START Remove power cord Interface cable and paper Remove paper tension unit Remove paper guide paper rest and printer cover Remove ribbon cartridge lon 4 2 5 2 Sectlon 4 2 1 Upper Case Removal Printhead Removal Section 4 2 3 Push Tractor unit Removal Section 4 2 4 1 PEGX Board Removal Section 4 2 4 2 PEBFIL J Board Removal Section 4 2 5 1 Printer Mechanism Removal
84. S and parallel adjustment bush has direction set as shown in Figure 4 42 Side Frame R 2 A 15 Carriage Guide Shaft 00 t Parallel Adjustment Bush u Carriage Guide Shaft B Parallel Adjustment Bush Figure 4 42 LS and Parallel Adjustment Bush Removal 3 Adjust the parallel adjustment bush where the printhead moves along the platen in parallel ADJUSTMENTS REQUIRED For assembly the following adjustments are required 4 3 1 Platen Gap Adjustment 4 3 2 Paper Feed Motor Backlash Adjustment REV A 4 2 5 15 Paper Guide Plate Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Separate the main and base units Refer to Section 4 2 5 1 I Step 3 For the FX 850 remove the two paper guide plate springs or for the FX 1 050 remove three paper guide plate springs with the mechanism status Paper Guide Plate AE Paper Guide Plate Spring Figure 4 43 Positional Relationship Between Paper Guide Plate and Paper Guide Plate Springs Step 4 Remove the paper guide plate ASSEMBLY POINT When setting the paper guide plate verify that its direction is correct aper Guide Plate Paper Feed Roller Unit Figure 4 44 Paper Guide Plate and Paper Feed Roller Unit Relationship 4 81 REV A 4 2 5 16 Paper Feed Roller Unit Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Separate the main and base units Refer to Section 4 2 5 11 Step 3
85. SSEMBLY TRACTOR FRAME TRACTOR SHAFT TRACTOR ASSEMBLY LEFT TRACTOR ASSEMBLY RIGHT 524 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 544 545 546 547 548 549 550 551 552 533 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 580 581 582 583 584 585 586 587 588 589 590 591 37 523 592 REV A Parts Name Reference Description PAPER SUPPORT TRACTOR GEAR TRACTOR UNIT COVER SPROCKET GUIDE SHAFT PAPER TENSION UNIT PAPER TENSION FRAME RIGHT PAPER TENSION ROLLER SHAFT ASSEMBLY PAPER TENSION SUPPORT ROLLER SHAFT PAPER TENSION ROLLER TRANSMISSION GEAR PAPER TENSION SUPPORT ROLLER PAPER TENSION UNIT COVER PAPER TENSION LOCK LEVER PAPER TENSION FRAME LEFT PRINT WHEEL SHAFT HOLDER PAPER GUIDE LABEL BASE FRAME CARRIAGE GUIDE SHAFT B HEAD ADJUSTMENT LEVER CARRIAGE GUIDE SHAFT B HEAD ADJUSTMENT BUSH PARALLEL ADJUSTMENT BUSH HEAD CABLE HOLDER HOME POSITION SENSOR CABLE DAMPER DAMPER SPACER TRANSPORT LOCKING BRACKET HEAD CABLE GUIDE OIL PAD RIBBON MASK TIMING BELT TIMING BELT TENSION SPRING CARRIAGE MOTOR MOUNTING PLATE BUSH PLATEN COVER PAPER GUIDE PLATE PAPER FEED MOTOR PLATEN SHAFT HOLDER PLATEN PLATEN GEAR PAPER FEED REDUCTION GEAR TRACTOR REDUCTION GEAR TRACTOR REDUCTION GEAR SPRING PAPER RELEASE LEVER SUB PAPER RELEASE LEVER PAPER FEED SP
86. Specifications Printing Method Serial impact dot matrix Pin Configuration See Figure 1 2 diameter 0 29 mm Wires 0222 2 172 3 Pi ze p 5l 7 Figure 1 2 Printhead Pin Configuration Feeding Method Friction feed Tractor feed push standard pull optional NOTES 1 When using friction feed Use the paper tension unit Do not use fanfold paper Do not perform reverse feed beyond than 1 6 inches after the paper end has been detected Do not use multi part single sheet forms 2 When using tractor feed Release the friction feed mechanism Multiple copies for printing must be finished by pasting them together at the line or dots Copy paper must be a carbonless multi part paper a When using push tractor feed Use the paper tension unit 1 3 REV A Do not perform reverse feeding for more than 1 6 inches Because accuracy of paper feed cannot be assured do not perform reverse feeding after the paper end has been detected b When using pull tractor feed Remove the paper tension unit and mount the pull tractor unit Use the paper path when a single sheet is inserted c When using push pull tractor feed Remove the paper tension unit and mount the pull tractor unit Do not loosen the paper between the platen and the pull sprocket Precisely the horizontal position of the pull sprocket and push tractor Do
87. Ton where T Ton Toff T is constant Therefore Vo can be held constant by controlling Ton Figure 2 15 shows the step down timings Voltage between the collector and the emitter of Tr Torr vl 0 em uo Mye Current at diode D when x E reverse recovered t Emitter current of Tr iid wi t a to 1 L Current at D M 0 Current at choke ve 0 L T OFF ILO le 2LtV1 Figure 2 15 Step Down Timings 2 18 REV A 2 3 2 5 Pulse Width Modulation PWM Circuit Figure 2 16 shows the internal circuit of the NJM2355 IC The PWM comparator operates as follows In circuit 1 the output from AMP 1 flows into the negative terminal of comparator 1 and the outputs from AMP 2 and AMP 3 in circuit 2 flow into the negative terminal of PWM comparator 2 without wired OR Dead time control voltage is also input to additional negative terminals of both PWM comparators 1 and 2 A sawtooth waveform from the oscillator is input to the positive terminals The sawtooth waveform from the oscillator causes the comparators to generate pulses as shown in Figure 2 17 Circuit 1 Low Voltage Stop Circuit 2 r Figure 2 16 NJM2355 Internal Circuit 2 19 REV A ft As shown in Figure 2 17 when the potential at the NJM2355 is lower than the preset voltage or current value it is controlled by the dead time control voltage When it exc
88. V DC 2 2 2222 2 2 22 4 2 25 Figure 2 26 Vx Voltage Circuit meme 2 26 Figure 2 27 Reset Circuits net etre mme eet e ri eESEE LEN M COLL ERE 2 33 Figure 2 28 Interface Control Circuit Block Diagram 2 34 2 ii Figure 2 29 Data Transmission Timing mme 2 35 Figure 2 30 Serial Data i onini id 2 36 Figure 2 31 DIP Switch 2 2 37 Figure 2 32 Memory Back up Circuit eee 2 38 Figure 2 33 Carriage Motor Control Block 2 41 Figure 2 34 GA E05A15HA Operation Diagram 2 42 Figure 2 35 GA E05A16GA Operation Diagram 2 43 Figure 2 36 Carriage Motor Drive Circuit Block Diagram 2 44 Figure 2 37 Carriage Motor Drive Sequence wi 2 45 Figure 2 38 Carriage Motor Drive Circuit Block Diagram 2 47 Figure 2 39 Carriage Motor Control Circuit 2 48 Figure 2 40 High Speed Skip 2 50 Figure 2 41 Home Position Seek Operation 2 51 Figure 2 42 Home Position Seek Phase 2 52 Figure 2 43 Paper Feed Motor Drive Circuit Block Diagram 2 53 Figure 2 44 GA E0
89. alf dot protection 1 Enable 2 Disable Read data from PO P4 Bit 7 5 Not used Bit P4 Bit P3 Bit P2 Bit P1 Bit PO Write data to P5 Write P5 data to the mode register bit 5 Clear 1st printhead data buffer Clear printhead data 9th bit gt Head Data bit 7 Clear 2nd printhead data buffer Set printhead data 1st 8th bit Head Data bits 7 O Read paper feed motor phases Bit 7 4 Not used Bit 3 Bit 2 Bit 1 Bit O Set paper feed motor phases A phase C phase B phase D phase Bit 7 7 Not used Bit 3 2 Bit 1 B phase BitO D phase 1 1 REV A Table A 8 GA E0515HA Control Functions cent d Adress READ WRITE 05H Control Functions Read carriage motor phases Bit 7 4 Not used Bit 3 Bit 2 Bit 1 Bit O A phase C phase B phase D phase Set carriage motor phases Bit 7 4 Not used Bit 3 Bit 2 Bit 1 B phase BitO D phase A 12 REV A A 1 3 Gate Array E05A16GA The E05A 16 is a custom gate array used to implement the following functions Super subscript generator converts the normal CG pattern image data received from an external device into super subscript character data Italic character generator converts the normal CG pattern image data received from an external device into italic character data 24 bit shift register 8 bit parallel interface Automatically
90. amp OX 0123450789 gt 2 0 ABCDEF GHIJKLMNOPQGRSTUVWXYZ V bcdefghti kImnopqrstuvwxyz amp Q0 7 0123456789 5 lt gt 78ABCDEFGHIJKLMNDPGRSTUVWXYZEN abcdefghiiklmnoparstuvwxyz 08 7 0123456789 42 6ABCDEF GHIJKLMNOPQGRSTUVWXYZ _ abcdefghijklmnoparstuvwxy z i amp 7 01234567891 lt gt SABCDEF GHIJKLMNOPORSTUVWXYZ N abcdefghijiklanopar stuvwxy z 7 0123456789 lt gt ABCDEF GHIJKLMNOPGRS TUVUXYZIN abcdef ghijklmnoparstuvwxy z CY i NLO Saris Serif Mode Figure 1 8 Self Test Printing 1 19 REV A 1 6 HEXADECIMAL DUMP FUNCTION The hexadecimal dump function causes the printer to print the received data in hexadecimal The printer prints 16 values in hexadecimal followed by the corresponding ASCII characters on one line If there is no corresponding printable character for a value i e a control code a period is printed Any remaining data less than 16 values can be printed by operating the ON LINE switch No panel settings can be made in the hexadecimal dump mode This function makes it easy for technician to identify the source of communications problems between the printer and computer Table 1 24 lists the self test operating instructions and Figure 1 9 shows the hexadecimal dump printing Table 1 24 Hexadecimal Dump Operation Function stop Hexadecimal dump mode Turn the power ON while Press the ON LINE switch to pressin
91. are initialization and software initialization 1 7 4 Hardware Initialization This type of initialization occurs when printer power is turned on or when the printer receives the INIT signal from the host computer via the 8 bit parallel interface When printer is initialized in this way it performs the following actions Initializes printer mechanism Sets the on line mode Sets the page length to 11 or 12 inches according to the DIP switch Clears the input data buffer and print buffer Read DIP switch and jumper settings Sets the print mode according to the DIP switch and the non volatile memory set by control panel Sets printer selections to their default values 1 7 2 Software Initialization This type of initialization occurs when the printer receives command ESC via software When the printer is initialized in this way it performs the following actions Clears the print buffer Sets printer selections to their default values NOTE The printer s default values are as follows Page Position Preset paper position becomes top of form position Left and Right Margin Released Line Spacing 1 6 inches Vertical Tab Position Cleared Horizontal Tab Position Every 8 characters relative VFU Channel Channel O Family Number of Type Style Roman Family Number O Downloaded Characters Deselected Software initialize Cleared Hardware initialize Justification Left justification Character Per Inch 10
92. arriage Mechanism The carriage is driven by the carriage motor via a timindlkeicarriagedxars beftsaadpegha Since a stepPer motor is used for the carriage motor position The carriage motor is controlled by a very simple open loop system Figure 2 4 shows the carriage mechanism Figure 2 4 Carriage Mechanism 2 2 3 Home Position Sensor The home position sensor detects the home position of the carriage A home Positio seek is performed when the printer is initialized The control circuit stores the home position which is referenced to control the carriage motor position 2 5 REV A 2 2 4 Ribbon Feed Mechanism Carriage movement is conveyed to the series of gears in the ribbon feed mechanism The ribbon feed mechanism converts bidirectional horizontal carriage movement into single directional rotational movement so that the ribbon can be taken up during printing Figure 2 5 shows the ribbon feed mechanism Ribbon Breaking Belt Driven Pulley Spring Planet Gear 7 Ribbon Driving Gear Figure 2 5 Ribbon Feed Mechanism REV A 2 2 5 Paper Feed Mechanism The paper feed mechanism is composed of the paper feed motor platen push tractor unit paper tension unit and release mechanism Either the friction feed or tractor feed system can be selected depending on the paper used There are two paper entrances One is for friction feed and the other is for tractor feed Rotati
93. available Figure 2 30 shows the serial data flow Option I F GA CPU 8143 EO5A 16GA 78 10HG 4B IN RXOUT 3 1 Serial Data HOST BUSY RDY COMPUTEF PDO i TXD PCO Figure 2 30 Serial Data Flow Sequence 1 Serial data from the host computer is input to terminal IN7 of the gate array via the optional interface 8 143 using a start stop system The serial data is input in order of the start bit data 7 or 8 bits and stop bits While a byte of data is being processed the printer is kept in the BUSY state 2 The data input into the gate array is serially transferred from the RXOUT terminal to the RXD terminal of the printer 3 The byte of serial data input to the CPU is converted from serial to parallel in the CPU and stored in the input buffer The BUSY state is cleared 4 The printer is ready to accept the next data byte REV A 2 3 4 3 DIP Switch Circuit and Jumpers The printer has two types of DIP switches and two jumpers Figure 2 31 shows the DIP switch circuit 5V 1 2 CPU 7810HG 46 6 7 R100 1K J1 SW2 4 Figure 2 31 DIP Switch Circuit DIP switch settings are read by the DIP switch circuit whenever the printer power is turned on and whenever the INIT signal is sent to the printer from the host computer Jumpers There are two jumpers on the PEGX board J 1 Determines whether or not the internally fixed printer selection
94. base frame and remove the head cable holder Step 5 Remove FPC Base Frame Tab Head Cable Holder Figure 4 19 FPC Removal ASSEMBLY POINT The FPCs are taped to the base frame with a double sided adhesive tape Before retaping the FPC to the base frame use alcohol to clean the area where the adhesive stuck the FPC to the base frame 4 2 5 4 Carriage Motor Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the carriage motor wires from the wire holder Step 3 Remove the timing belt tension spring Step 4 Remove the two CPS 0 3 X 10 screws securing the carriage motor mounting plate to base frame via carriage motor mounting bush Step 5 Remove the carriage motor mounting plate together with the carriage motor Carriage Motor Timing Belt Tension Spring 9106 H1S 04662 6v W3 Lapsus eda Carriage Motor Mounting Platte Base Frame Carriage Motor Mounting Bush 5 0 3x10 Wire Holder Figure 4 20 Carriage Motor Removal 1 Step 6 Remove the four CPS O 3 X 6 screws on the rear side of the carriage motor mounting plate which secure the carriage motor Carriage Motor Carriage Motor Mounting Plate CPS 0 3x 6 Figure 4 21 Carriage Motor Removal 2 4 16 a i REV A ASSEMBLY POINT 1 Set the timing belt correctly at the drive pulley of the carriage motor 2 Mount the carriage mo
95. citation System Description 660 pps 2 2 Phase Continuous paper feed 720 pps 22 Cut sheet intermittent feed 780 pps 2 2 Phase Cut sheet continuous feed The paper feed direction is operated by following operation shown in Table 2 13 Table 2 13 Paper Feed Direction and Operation Feed Direction Description Control Panel Operation FF or LF switch Print Operation Paper Load Operation Micro Adjustment Operation Forward Paper Back out Operation Reverse Paper Load Operation Micro Adjustment Operation 2 55 REV A Speed Control s Since a stepper motor is used for the paper feed motor holding at any position is possible Acceleration constant speed and deceleration of the paper feed motor are performed by the firmware just like the carriage motor The speed control methods are described below Acceleration Control The paper feed motor is accelerated in accordance with the acceleration time table The acceleration time varies depending on the speed mode Table 2 14 shows the differences between the speed modes Table 2 14 Acceleration Deceleration Mode Speed Mode Feed Speed Excitation System d a Constant Speed 660 pps 2 2 Phase 7 6 Steps 1 52 mS 2 720 pps 2 2 Phase 7 6 Steps 1 39 5 3 780 pps 2 2 Phase 7 6 Steps 1 28 mS E Constant speed control The paper feed motor constant speed depends on the constant speed set time which varies depending
96. d adhesives required to service the equipment contents of this manual are subject to change without notice iv REV A REVISION REVISION TABLE DATE ISSUED CHANGE DOCUMENT REV A PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1 personal injury and 2 damage to equipment DANGER Signals a precaution which if ignored could result in serious or fatal personal injury Great caution should be exercised in performing procedures preceded by a DANGER headings WARNING Signals a precaution which if ignored could result in damage to equipment The precautionary measures itemized below should always be observed when performing repair main tenance procedures DANGER 1 ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE 2 NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK 3 WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS WARNING 1 REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN 2 MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE S
97. d or reverse of the carriage The mode register in the gate array determines the carriage movement direction and phase switching method and is fed by the CPU The gate array expands the phase data from the CPU in the carriage motor phase switching circuit in accordance with the direction and method determined by the mode register and outputs the data to the 4 phase stepper motor drive 2 Figure 2 34 shows the block diagram of the gate array IC3A operation CPU GA 15HA STK6722 2A Carriage 1A Motor IB Phase Switching Circuit ID Figure 2 34 GA E05A15HA Operation Diagram 2 42 REV A Gate Array IC7A E05A16GA This gate array IC7A outputs the carriage speed control signal PCO and PC3 to the 4 phase stepper motor drive IC IC2A STK6722HZ under the control of the CPU The carriage speed is controlled by combining the reference voltage for the 4 phase stepper motor drive IC IC2A with PCO Figure 2 35 shows the block diagram of the gate array 1C7A operation CPU GA EO5A 15 5V STK6722 7810HG 4B PDO 5181 Figure 2 35 E05A16GA Operation Diagram This gate array also performs another function When a hardware error except a paper end is detected in the printer the gate array outputs the power down signal PD 1 to the 4 phase stepper motor drive IC 2 and shuts off the 36 VDC so t
98. d to the point diagrammed in Figure 6 5 Avoid overview of excess to related parts Table 6 1 Lubricants and Adhesive Classification Designation Capacity Availability Part No Oil 2 40 B7 10200001 Grease G 27 40 gr E 6702700001 Adhesive Neji lock 2 g 1000 gr E B730200200 E EPSON exclusive product Table 6 2 Lubrication Points Refer to Figures 6 1 through 6 4 Lubrication Point Lubricant Contact portion of carriage motor mounting plate and base frame 2 Contact portion of sub paper release lever and paper release lever G27 3 Contact portion of tractor transmission gear and paper release lever G27 4 Contact portion of paper holding lever R and shaft G27 5 Contact portion of paper holding lever L and shaft G27 6 Contact portion of loading lever and shaft G27 7 Contact portion of head adjustment lever tab and holes of side frame L G27 8 Contact portion of paper feed roller holder and paper feed roller G 27 9 Carriage felt Lubrication is necessary in the process of assembly 6 1 REV A Pra Lubrication Points Diagram 1 Fogire 6 1 FX 850 6 2 REV A Fogire 6 2 FX 850 Lubrication Points Diagram 2 6 3 REV A Figure 6 3 FX 1050 Lubrication Points Diagram 1 6 4 ae E REV A Figure 6 4 FX 1050 Lubrication Points Diagram 2 6 5 REV A Table 6 3 Adhesiv
99. data The data is shifted at the falling edge of the RD signal WRITE 04H READ Shift out the MS bit of the 24 bits shift register MSB24 DB7 The data is shifted at the rising edge fo RD signal WRITE Load shift register 1st DB7 O Bit 23 16 2nd 7 0 gt Bit 15 8 3rd DB7 0 gt Bit 7 O A 17 REV A Table 1 GA E05A16GA Control Functions cent d Read the 9th data of the Super Subscript generator Interface parameter bit 7 DB7 Write the 9th pin data to the Super Subscript generator DB7 9th pin data of the Super Subscript generator Read 8 bits data from the Super Subscript generator 8 bits data of the Super Subscript generator gt DB7 O Write 8 bits data to the Super Subscript generator DB7 0 Super Subscript generator Read data from the parallel data latch 7 0 gt DB7 0 Write data to the Super Subscript generator and port D DB 1 2 PD 1 2 This gate array logically ANDs the two external reset signal inputs using internal logic then outputs the result to an external device one channel and resets the ports internally Table A 1 1 shows the port settings after they are reset Table 1 1 E05A16GA Initialized State Setting Port B PB7 PBO port C PC7 PB2 PC 1 PCO Port D PD 1 PDO Interface control port except bit 2 Hard ware BUSY signal Low Ready A 18 1 4 HM27256G 25 EP ROM
100. data from the CPU In addition the gate array controls the carriage motor and paper feed motor and drives the printhead and plunger solenoids Table 2 4 shows the pin assignments for the gate array Refer to the Appendix for the details on the gate array Table 2 4 Pin Function of GA E05A15HA Pin No Signal Name Direction Function BANK O OUT Not used BANK 1 OUT 3 CS4 OUT Chip select signal for the gate array 7A Low active signal 4 CS3 OUT Chip select signal for the ST RAM 6A Low active signal 5 CS2 OUT Chip select signal for the ST RAM 5A Low active signal 6 Cs 1 OUT Chip select signal for the P RAM 44A Low active signal 7 NEL Not used 8 EE EE IN Home Position HP signal input 9 P2 IN Paper End PE signal input 10 P1 IN Friction Tractor switch status input Friction mode High Tractor mode Low 12 CRA OUT Carriage motor driving signal 13 CRB OUT 14 CRC OUT 15 CRD OUT 16 HD 1 OUT Printed driving signal Head Data 1 8 23 HD8 OUT 24 Vss Logic Ground 25 Vss 2 29 REV A Pin No 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 55 56 63 64 Table 2 4 Pin Function of GA E05A15HA cent d Signal Name A13R Al 4R Al A2 CTRG RST Vss ALE CTRG A3 A7 DO Direction OUT Address bit Al 3 for the P ROM 4A OUT Address bit Al 4 for the P ROM 4A OUT 12 1
101. driver 2 0 743800200 Box driver 7 mm across 0 74 1700200 Thickness gauge 0 50 0 776700301 Round nose pliers 0 740400100 Diagonal cutting nipper 0 740500 100 Tweezers 0 64 1000100 E ring holder 22 5 0 740900400 E ring holder 3 0 740800500 E ring holder 4 0 740800600 E ring holder 5 0 740800700 Alcohol 0 Electric soldering iron B740200 100 Brush No 1 B74 1400200 Brush No 2 B74 1400100 Cleaning brush B74 1600100 0 Commercially available product E EPSON exclusive tool Table 4 2 Measuring Instruments Description Specification Necessary Convenient Multi meter Oscilloscope 20 MHz or more Logic analizer Table 4 3 Lubricants and Adhesive Description Capacity Availability Part No 2 40 7 10200001 27 40 702700001 Neji lock 2 G 1000 gr E B730200200 Adhesive tape 0 Commercially available product E EPSON exclusive product 4 1 REV A Figure 4 1 shows some of the parts found on the FX 850 1050 f Paper Guide Edge Guide Printer Paper Release Lever s Control Panel Paper Tension Unit Push Tractor Print Head Ground Connector Parallel Interface P Power Switch Figure 4 1 Parts of the FX 850 1050 4 2 REV A WARNING There are several precautions you should take after performing troubleshooting and when packing the printer for transport 1 Remove the ribbon cartridge and platen knob Figure 4 2
102. e Application Point Refer to Figure 6 5 Adhesive Application Point 11 Engaging parts between timing belt and carriage Carriage Position a Carriage Position 1 1 Neji Lock 2 b Bottom View Figure 6 5 Adhesive Application Point REV A APPENDIX AMC DESCRIPTIONS onsi 202 RR x Y kae i pv Rr kr ave EN E 1 1 CPU LLPD781OHG viii 2 1 2 Gate Array E05A15HA wcities A 7 A 1 3 Gate Array 05 16 eee A 9 1 4 HM27256G 25 EP ROM 1 9 A 1 5 HM6264ALSP 12 CMOS ST RAM M21 A 1 6 NJM2355 A 23 A 1 7 STK6722H 4 Phases Stepper Motor A 24 2 EXPLODED DIAGRAMS AND 5 5 A 26 LIST OF FIGURES Figure A 1 yPD7810 781 1 Pin 2 Figure 2 4PD781 0 781 1 Block Diagram A 3 Figure A 3 OP Code Fetch 6 Figure 4 Memory Read 0 22222 22 2 6 Figure 5 Memory Write 0 lt A 6 Figure A 6 GA E05A15HA Pin Diagram A 7 Figure 7 GA E05A15HA Internal Block
103. e the RE 2 3 at the plunger lever Step 8 Remove the RE 3 at the paper holding lever L Step 9 Remove the HNO 4 nut securing the head adjustment lever to carriage guide shaft B then remove head adjustment lever Step 10 Detach the paper holding lever L spring from the paper holding lever L Step 1 1 Remove the paper holding lever L Head Adjustment Lever Paper Holding Lever L Paper Holding Lever L Spring Plunger Lever HNO 4 RE 2 3 Figure 4 49 Paper Holding Roller Lever L Removal 4 34 REV A 4 2 5 19 Push Tractor Unit Disassembly This section describes the removal of the tractor assembly left Since disassembled parts can be reassembled by using the removal procedures in reverse order 2SSembly procedures have been omitted Step 1 Remove the shaft holder from the tractor mounting plate L Step 2 Remove the CPS 0 3 X 6 screw securing tractor mounting plate L to the tractor base frame Step 3 Remove the HNO 4 nut securing the tractor guide shaft Step 4 Remove the tractor side frame L Step 5 Push the tractor lock lever upward and remove the left sprocket assembly from the shafts Tractor Lock Lever Tractor Assembly left Tractor Shaft Holder Figure 4 50 Tractor Assembly left Removal ASSEMBLY POINT When mounting the tractor assemblies to the shafts set them so that the marks on the right and left tractor frames are at the same position Make sure that the pins on the right and
104. ead Pin Configuration 1 3 REV A Figure 1 3 Cut Sheet Paper Printable 1 6 Figure 1 4 Fanfold Paper Printable 1 7 Figure 1 5 Head Adjustment Lever 0 1 8 Figure 1 6 Data Transmission Timing of 8 bit Parallel Interface 1 12 Figure 1 7 36 57 30360 Figure 1 8 Self Test Printing 55e 1 19 Figure 1 9 Hexadecimal Dump 0 Figure 1 10 Paper End Detection 1 24 Figure 1 11 Component 1 25 Figure 1 12 Model 3B10 850 2 2 2 1 26 Figure 1 13 Model 3B60 1050 1 26 Figure 1 14 PEGX Boatd 1 55555 sniene creed 1 27 Figure 1 15 PEBFIL II Board and Power Transformer 1 28 Figure 1 16 Control Panel nem 1 29 Figure 17 HOUSING zs e 1 31 LIST FO TABLES Table 1 1 Optional Units seemed 2 Table 1 2 Optional Interface Boards
105. ection indicates possible causes and checkpoints for different of power supply circuit The checkpoints include waveforms for normal operation By referring to the checkpoints determine the detective component and perform the proper repair Table 5 6 has the following four columns Symptom Check symptoms against those given in this column Cause Check problems against the causes listed in this column Check Point Use the instructions given in this column for troubleshooting Solution Make repairs according to the instructions given in this column Table 5 5 Power Supply Circuit Parts List Location Name Description IC 1A NJM2355 Pulse width modulation control DB1 DBF608 Diode Bridge 100V 6A Glo 012 25 1 450 80V 500mA 600mW Q11 28C3748 60V 10A 013 25 3746 60V 5 2 Fuse 250 3 15A F3 Fuse 125V 2A F4 Fuse 125V 2A REV A Symptom The 5V dead Table 5 6 Power Supply Circuit Unit Repair Cause Check Point IC 1A is Observe the oscillation waveform and the switching defective waveform 0 1V DIV 20us DIV Oscillation Waveform pin 2 of IC 1A 10V DIV 20us DIV Switching Waveform Pin 9 of IC 1A Transistors Q 12 Observe the chopping waveform and Q 13 are defective 10V DIV 20us DIV Chopping Waveform Emitter of Q13 Solution Replace IC 1A Replace 012 or 013 The 24V dead Vx voltage is not output REV A Table 5 6 Power Su
106. ed Abnormal Operation of Control Panel Although the carriage returns to the home position the printer does not enter READY mode No printing is executed Printhead dot missing No paper is fed Separation between lines varies with irregular paper feed No paper is fed by operation of the LF or FF switch in OFF LINE mode No operation mode is set from the control panel ON LINE or OFF LINE mode is not obtained 5 12 42 5 15 Carriage operates normally at power ON and the result Incorrect Printing in ON LINE Mode of the self test is correct However the print data from the computer is not output normally START 18 the AC input voltage normal PEBFIL X boord blown Measure te output voltage from PEGX boord Refer to Tobles 5 5 ond 5 6 Is the output voltage normal No Yes Replace the PEGX board No Is the fault corrected Use correct AC input voltage Reploce the fuse and disconnect the CN d CN18 Replace the printer 1 Printer does not operate with power switch ON POWER LED does not light is the new fuse also blown Yes Replace the PEBFIL I boord power transformer No 15 the fault corrected Yes Repiace the PEGX boord REV A 2 The carriage does not operate correctly START No Are connectors CN4 CN5 CN6 CN8 9
107. eeds the preset value it is controlled by the error amplifier to keep it lower than the preset value Terminal ed us gt OTerminal Oead Time Control Voltage PWM Comparator output Figure 2 17 Output Transistor Drive Waveform 2 20 2 3 2 6 5V Regulator Circuit Figure 2 18 shows the 5 VDC regulator circuit NJ M2355 switching regulator is used for constant frequency pulse width modulation The circuit shown below employs an NJ M2355 configured as a chopper style switching regulator circuit This IC has a built in oscillator The oscillation frequency is determined by external components connected to pins 2 and 3 Therefore R22 and C9 cause the circuit to oscillate at about 30 kHz The oscillator waveform is shown in Figure 2 19 C3746 013 sey NJM 2355 7A R14 3 R 19 33K Figure 2 18 5V Regulator Circuit 20ys DI v Figure 2 19 Oscillator Waveform 2 21 REV A AMP 1 in the IC is an error amplifier used to monitor the output voltage Figure 20 shows the f constant voltage control circuit Pin 1 of the provides a 5 V reference output Vref which is applied to the negative terminal of AMP 1 The error amplifier adjusts its output according to the voltages applied to the positive and negative input terminals This has the effect of maintaining the voltage at the terminal at 5V Figure 2 21 shows the output from AMP
108. er via the filter circuit The AC voltage is converted to 26 VAC and 12 VAC by the transformer and is input to the power supply circuit on the PEGX board The 26 VAC is converted to approximately 36 VDC by the full wave rectifier and smoothing circuit The unregulated DC voltage and the regulated 24 VDC and 5 VDC total of 3 supplies are supplied to the control circuit Switching regulator IC NJ M2355 1A controls the chopper type switching regulator circuits for 24 VDC and 5 VDC The 36 VDC and 5 VDC are supplied to the Vx voltage circuit converted to the Vx voltage and supplied to the reset circuit The 12 VAC is converted to unregulated 12 VDC by the positive half wave rectifier and the smoothing circuit and is supplied to the control circuit Table 2 2 Power Supply Application Voltage Application Logic circuit Plunger solenoid holding voltage Paper feed motor holding voltage Signal pull up voltage Plunger solenoid driving voltage Paper feed motor driving voltage Carriage motor driving voltage 24 Printhead driving voltage Option interface voltage Option interface voltage REV A 2 3 1 2 Control Circuit Section Figure 2 9 shows the control circuit block diagram eT 49 1Jp J gt 90D 1109 2 9 BIN ru 2 2 Qu H il S s x Em d 5 m 4
109. erated by driving the carriage motor Figure 2 41 shows the operation flow and Figure 2 42 shows the phase state of home position seek START Q Accelerate the carriage from right to left Set 2 2 phase excitation with 2134 PPS of the CR motor 0 68 Home position Hold the CR motor until 20 30 ms Decelerate the carriage until it stops Move the carriage from left to right 4 steps 10 15ms phase step Move the carriage from b Confirm the phase right to left 4 steps excitation state of the CR motor Home position Set the phase excitation state to firmware flag Yes Accelerate the carriage from left to right Home position No Decelerate the carriage until it stops Figure 2 41 Home Position Seek Operaiton 2 51 REV A In 1 HP Si 1 Signa Dos Phase CR Motor Phase Phase D Detects HP Signal Reads and sets the phase change point in the CPU Figure 2 42 Home Position Seek Phase States 2 52 ok Wey REV A 2 3 5 3 Paper Feed Control Circuit The paper feed mechanism of this printer is driven by the paper feed motor The paper feed motor is controlled by a gate array IC3A E05A1 5HA and the CPU Figure 2 43 shows the paper feed motor drive circuit block diagram Vu 5V GA EOSA 15HA Figure 2 43 Paper Feed Motor Drive Circuit Block D
110. ers so that command processing speed is improved and the load on the firmware is lightened E05A15HA gate array 3A 05 15 gate array has address latch and address decode functions and controls the memory The gate array also controls the carriage and paper feed motors using the 2 channel automatic phase switching circuit In addition the gate array reads the states of the head data buffer carriage home position sensor paper end sensor and release switch sensor Other control circuits are as follows Reset circuit The reset circuit outputs the reset signal The reset signal is sent to the CPU for the necessary time either when the printer power is turned or when the I NIT signal is input from the host computer eMemory back up circuit The memory back up circuit backs up the panel settings and data for the top of form TOF position stored in the SRAM 6A when the printer power is turned off so that the values will remain valid when the printer power is turned on again The DC voltage supplied to this circuit is monitored and power is supplied from the battery for back up when the main power voltage level drops Plunger drive circuit The plunger drive circuit drives the plunger using the plunger control signal The plunger is controlled by switching the drive voltage on and off Paper feed motor drive circuit The paper feed motor drive circuit drives the paper feed motor using the motor control signals The paper feed
111. following functions are set to the default values shown in the table below Table 1 19 DIP Switch 1 Settings SW Description 1 1 Default character set User defined 1 2 Shape of zero Slashed 1 3 Table select Graphic LEE 1 4 Protocol mode IBM emulation 1 5 Short tear off mode off n 1 7 International character set See Table 1 20 NOTE When DIP SW 1 4 is on IBM mode the function of DIP SW 1 3 changes to auto CR ON OFF Default character set When DIP switch 1 1 is ON the user defined character set will be selected as default User defined characters are maintained in printer memory even when the power is turned off so the user defined character set can be easily selected simply by turning off the power setting this switch to ON and then turning the power on again Shape of zero When DIP switch 1 2 is ON prints a stashed zero 0 when OFF prints open zeros 0 Useful for clearly distinguishing between uppercase O and zero when printing program lists etc Protocol mode When DIP switch 1 4 is ON printer operates in the IBM emulation mode when off printer operates in the Epson ESC P mode Functions of DiP switches 1 6 1 7 and 1 8 are different when using the printer in the IBM emulation mode Short Tear off When print operation has finished the short tear off feature automatically feeds the perforation of the continuous paper to the tear off edge of the sheet guide cover so that the user can tear off the last sheet
112. g both the LINE FEED set the printer off line Next and FORM FEED switches turn off the printer Data Dump Mode QOOO 1 40 00 1B 55 00 1B 33 1E 00 OD QA 12 1B 70 8 0 2 P 0001 1B 7e 01 1B 57 00 1B 4D 20 20 20 43 48 41 50 54 X W M CHAPT 0002 45 52 20 31 OD OA OD OA 20 20 20 28 31 2E OA 22 1g we 0002 OA 20 2 20 31 2E 5120 20 4 amp 65 61 74 75 72 1 1 Featur 0004 65 72 OD 20 20 20 54 68 65 20 46 58 2D 28 35 es The FX 83 0009 020 61 6E 64 20 46 58 2D 31 3o 38 30 20 61 72 end FX 1050 0006 8 5 20 73 65 72 69 61 5 20 64 6F 74 20 61 74 e serial dot mat 0007 72 59 78 20 59 2D 70 69 6E 20 74 65 72 6D 69 6E rix 9 pin termin 0008 61 C 20 70 72 69 6E 74 63 72 73 20 74 68 61 74 el printers that 0009 OD OA 20 20 20 70 72 69 6E 74 20 61 74 20 amp 1 20 print at 6 61 78 69 6D 75 6 20 6F 66 20 32 36 34 20 4 3 maximum of 264 C 50 53 2E 20 20 45 59 74 6B 65 72 20 5 6F 64 65 Ps Either mode C 20 46 58 2D 3s 35 30 20 77 69 74 68 20 35 30 1 FX 850 with BO 0000 20 63 FAC 75 60 6E 73 20 6F 72 20 46 58 2D OD columns or FX OWE OA 20 20 20 31 30 35 30 20 77 69 74 68 20 31 33 1050 with 13 OOOF Z 20 63 6 6 75 amp D 6E 73 20 6 61 6E 20 62 65 6 columns can be 0010 20 73 65 6C 65 63 74 65 64 20 61 63 63 6F 72 64 selected accord 0011 69 6E 67 20 74 SF 20 79 S amp F 75 72 20 72 455 71 75 ing to your requ 0012 69 72 65 6D 6S 6E 74 73 2E 20 20 s4 68 65 OA i
113. g of 8 bit Parallel Interface 1 STROBE 2 3 DATAI DATA2 DATAZ DATA4 4 5 6 DATAS 7 8 DATAT 9 10 11 12 13 14 15 16 17 18 BUSY PE SV AUTO FEED X NC GND CHASSIS GND NC 772 19 20 21 22 23 24 25 26 27 28 29 30 31 32 34 35 36 GND Pair witn1 Pair witn2 GND Pair witn3 GND Pair w tn 4 Pair witnS GNO Pair witn6 GNO Pair witn7 GNO Pair witn8 GNO Pair witn9 OND Pair witn10 GNO Pair witn11 GNO Pair witn12 INIT ERROR GNO NC 5V SLCTIN cigure 1 7 36 Pin 57 30360 Connector 1 13 REV A REV A Table 1 17 Pin No 19 CANDO FWP e 11 12 13 14 16 17 18 31 32 30 shows the connector pin assignments and signal functions of the 8 bit parallel interface Table 1 17 Connector Pin Assignments and Signal Function Signal Name STRORE DATA 1 DATA 2 DATA 3 DATA 4 DATA 5 DATA 6 DATA 7 DATA 8 ACKNLG BUSY PE AUTO FEED XT NC OV CHASSIS GND NC GND INIT Return Pin No 19 20 21 22 23 24 25 26 27 28 29 30 DIR out out out Functional Description Strobe pulse to read the input data Pulse width must be more than 5 Input data is latched after falling edge of this signal These
114. gnal Function cent d Signal Name Return Pin No DIR Functional Description Pulled up to 5V through 3 3 K ohms resistor SLCT IN In The DC 1 DC3 code is only valid when this signal is HIGH level Internal fixing can be carried out with Jumper I NOTES 1 2 DIR refers to the direction of signal flow as viewed from the printer Return denotes TWISTED PAIR RETURN and is to be connected at signal ground level As to the wiring for the interface be sure to use a twisted pair cable for each signal and never fail to complete connection on the Return side To prevent noise effectively these cables should be shielded an connected to the chassis of the host computer and the printer respectively All interface conditions are based on TTL level Both the rise and fall times of each signal must be less than 0 25 Data transfer must not be carried out by ignoring the ACKNLG or BUSY signal Data transfer to this printer can be carried out only after confirming the ACKNLG signal or when the level of the BUSY signal is LOW REV A Table 1 18 shows the printer select deselect DC 1 DC3 control including relations among ON LINE SLCT IN input DC 1 DC3 and interface signals Table 1 18 Printer Select Deselect Control f ON LINE SW SLCT IN DC1 DC3 ERROR BUSY ACKNLG DATA ENTRY OFF LINE HIGH LOW DC 1 DC3 LOW HIGH No pulse Disable ON LINE LOW HIGH Pulse output Enable Nor DC 1 HIGH
115. gt b b Figure 4 55 Eccentric of Carriage Guide Shaft B Figure 4 56 Platen Gap 4 38 REV A Step 12 Hold carriage guide shaft B in place and tighten the HNO 4 nut Step 13 Move the carriage to the left end and measure the gap value again to confirm that it is correct Step 14 Move the carriage to the right end and measure the gap value again to confirm that it is correct Step 15 Remove the printhead Step 16 Reinsert the ribbon mask into the ribbon mask holder Step 17 Connect the FPC to the printhead and reinstall the printhead onto the carriage REV A 4 3 2 Paper Feed Motor Gear Backlash Adjustment This adjustment is required either when the paper feed motor is replaced or when its mounting position is shifted Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Loosen the two CPS O 3 X 6 screws on the paper feed motor Step 3 Manually rotate the paper feed motor and adiust the gear backlash between the pinion and the paper feed transmission gear Allowable backlash 0 10 0 05 mm Step 4 Tighten the screws on the paper feed motor Paper Feed Transmission Gear F Paper Feed Motor SPE D I B Paper Faed Transmission Gear Pinion 0 10 0 05 mm Figure 4 57 Paper Feed Motor Pinion Gear Backlash Adjustment 4 3 3 Bi Directional Print Alignment Adjustment REV A If printing is misaligned in during bi directional print operation align the printer by control
116. gure Figure Figure Table Table Table Table Table Table Table Table Table A 24 A 25 A 26 27 1 2 3 4 5 6 7 8 9 Table 1 Table 1 1 Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table A 1 2 A 1 3 A 14 A 1 5 A 1 6 1 7 A 18 A 1 9 A 20 A 21 A 22 A 23 A 24 A 25 A 26 27 FX 1050 Exploded Diagram 2 A 35 1050 Exploded Diagram 3 A 36 FX 850 Case Outline A 38 FX 1050 Case Outline 0 A 39 LIST OF TABLES IC List PEGX Board 0 0 1 Transistor List node dp 1 07810 Mode 4 wPD7811 PF 4 wPD7810 PF 4 781 0 781 1 Port Functions A 5 GA E05A15HA Port Functions A 9 E05A15HA Control Functions wie A 11 GA E05A16GA Port 15 E05A16GA Control Functions 17
117. h mechanism and the control circuit on the PEGX board CN7 Q 7 Paper Feed Motor i Push Control Circuit Paper Tractor A of vou 2222 Paper End Sensor Plunger Platen 2 500 66 5 55 6 Paper Feed Motor O Carriage Motor Printhead Carriage Motor Control Circuit Drive Circuit Figure 2 2 Printer Mechanism Block Diagram The printer mechanism is composed of the following Printhead Carriage Mechanism Home Position Sensor Ribbon Feed Mechanism Paper Feed Mechanism 2 3 2 2 1 Printhead printhead is an electromagnetic induction 9 pin serial dot head Nine dot wires are driven individually to print a dot pattern on the paper positioned between the platen and ribbon by hitting the ink ribbon against the paper and the platen Print data expanded on the PEGX board is converted into dot image data for one vertical row and output to the printhead by the printhead drive circuit A character is printed by serially printing the dot patterns for each vertical row in the horizontal direction as the carriage moves Figure 2 3 shows the printhead mechanism Platen Dot Wire Ribbon Mask 4 4 ecc Paper iron Core gt lt Head Driving Coil Actuating Plate Spring WireResetting Spring Stopper Actuating Plate 7 2 Figure 2 3 Printhead Mechanism 2 4 ea REV A 2 2 2 C
118. hat damage to the circuit can be minimized 2 43 REV A 4 phase Stepper Motor Drive IC IC2A STK6722HZ The 4 phase stepper motor drive IC directly drives the carriage motor under control of the gate arrays IC3A E05A15HA and IC7A E05A16GA Figure 2 36 shows the carriage motor drive circuit block diagram GA E05A15HA STK6722 2 1 CRB 1B CRC IC CRD ID GA EO5A 16GA oy 1 PD us 7A 58 Vref Pct CCD CAB Figure 2 36 Carriage Motor Drive Circuit Block Diagram m Mi 2 44 REV A Carriage Motor Excitation System The carriage motor is controlled by the carriage motor constant current drive circuit The phases of the carriage motor are controlled by CRA CRD of the gate array IC3A E05A 15GA Two drive systems 2 2 phase and 1 2 phase excitation are used Because the carriage motor has one driving transistor per winding unipolar drive two drivers become active in the 2 2 phase excitation system and one and two drivers become active alternately in the 1 2 phase excitation system Figure 2 37 shows the carriage motor drive sequences 1C1A OFF EN 2 4 OFF L oc ON OFF OD m L Step a ff _ Rotat ion C C w Carriage moves left to right a 2 2 Phase Excitation IC1A 0 OFF 1 rc OFF 1 Step J Rotat
119. iagram AS you can see in Figure 2 43 the paper feed motor drive voltage is controlled by PC7 from the CPU and phase switching is performed by the gate array I C3A The paper feed motor rotates in both forward and reverse directions Since the paper feed motor rotates in the reverse direction only for micro adjustment or sheet load eject the paper feed motor cannot be rotated in the reverse direction by any control codes Paper Feed Motor Specifications Type 4 phase 48 pole PM type stepper motor Voltage Driving 36 VDC Holding 5 VDC Coil Resistance 780 230 at 25 per phase Current Driving 1 2 Holding 0 08 A typical Excitation 2 2 phase Paper Feed Pitch 0 118 mm pulse 4 23 mm 1 6 36 pulse 2 53 REV A Gate Array E05A15HA This gate array IC3A directly controls phase switching for the paper feed motor to switch the rotational direction under control of the CPU Data for phase switching is sent from the CPU expanded in the paper feed motor phase switching circuit and output as the phase switching signal to switch the rotational direction of the paper feed motor CPU GA E05A15HA _ 4 gt PFA Motor Phase Switching Circuit PFD Figure 2 44 GA E05A15HA Function for Paper Feed Motor Paper Feed Motor Excitation System The paper feed motor is controlled by the open loop constant v
120. ibit reception of data when any of the following states occurs The carriage home signal is not detected after the printer mechanism has been initialized carriage error b The carriage home position is detected during printing carriage error The printer is set OFF LINE using the LINE switch An internal DC voltage drop is detected abnormal voltage is detected During initialization an error is detected by a READ WRITE check of the RAM in the control circuit A printhead drive transistor is shorted Interface signal PE is also set HIGH in addition to the above error sequence when any of the following states occurs The printhead is moved outside of the printable area by a forms override function paper end state The paper end state continues after the cut sheet feeder mode has been set and paper loading has been completed paper end state REV A 1 9 PAPER HANDLING FUNCTIONS The push tractor unit can be easily mounted or removed using the paper release lever Either continuous paper or cut sheets can be easily selected by operating the LOAD EJECT switch and paper release lever Various paper handling functions are described below 1 9 1 Autoloading and Backout Function Loading and ejecting a cut sheet When no sheet is loaded push the paper release lever backward load the sheet along the sheet guide and press the LOAD EJECT switch so that the sheet is automatically fed up to the TOF position When the LOAD
121. istor is monitored at AN 1 pin 35 of the CPU RAM error The buzzer beeps 6 to 10 times pausing briefly after every 2 beeps The beeps warns which RAM is incorrect as follows Beeps 6 times internal CPU Beeps 8 times ST RAM 5A Beeps 10 times ST RAM 6A There are three RAMs on the PEGX board a 256 byte RAM in the CPU and static RAMs IC5A and IC6A When the printer power is turned on read write tests of the RAM in the CPU and SRAMIC5A are performed and a check sum of the IC6A back up SRAM is calculated and checked When any of the above four errors carriage error abnormal voltage shorted printhead drive transistor or RAM error is detected the printer is set OFF LINE and the following process is performed e Prohibit interrupt elnitialize 1 0 port Initialize printhead data Drop 24VDC and 36VDC BUSY signal goes high signal goes low Buzzer beeps 2 39 REV A Paper End Error f The buzzer beeps 20 times with a pause after every four beeps B paper was loaded when the printer power was turned on The paper out state was detected during printing paper feeding When the paper out state is detected the printer is set OFF LINE and the following process is performed PE signal goes high PE LED lights Buzzer beeps 2 40 REV A 2 3 5 Printer Mechanism Control This section describes following operating principles Carriage Control Circuit and Software Contro
122. l Paper Feed Control Circuit and Software Control Print Control Circuit 2 3 5 1 Carriage Control Circuit The carriage mechanism of the printer is driven by the carriage motor Reversing the motor rotation holding and phase switching for the carriage motor are controlled by the 4 phase stepper motor drive IC IC2A STK6722HZ This IC IC2A is controlled a gate array E05A15HA which is controlled by the CPU The rotational speed of the carriage motor is controlled by another gate array IC3A E05A16GA This gate array 1C7A also outputs the power down signal PD 1 that shuts off carriage motor drive voltage Vu when a hardware error is detected Figure 2 33 shows the block diagram of the carriage motor control circuit GA EOSA15HA 5 6722 Carr lage Motor 00 VREF CCD CAB GA 5 16GA Figure 2 33 Carriage Motor Control Block Diagram 2 41 REV A Carriage Motor Specifications Type 4 phase 200 pole stepper motor Voltage Driving 36DC Holding 5V DC Coil Resistance 110 7 at 25 C per phase Current Driving 0 68A max Hoding O 15A typical Excitation 1 2 phase 2 2 phase Gate Array IC3A E05A15HA This gate array outputs the phase switching signals CRA CRB CRC and CRD to the 4 phase stepper motor drive 2 STK6722HZ under the control of the CPU Phase switching cycles and timing vary depending on the speed and the mode forwar
123. l input 6 OUT PWD signal output o2 PC7 OUT Paper feed motor driving control output 25 NM 1 Not used 2 27 REV A Pin No 26 27 28 29 30 31 32 33 34 35 36 37 39 40 41 42 43 44 45 46 47 54 55 62 63 64 Table 2 3 Pin Function of CPU cent d Signal Name Direction Function INT1 Not used MODE1 External mode setting terminal RESET IN External reset signal MODEO External mode setting terminal x2 24 Oscillator terminal FX 850 1050 14 74 MHz 55 T Ground AVss m Analog port ground ANO IN Vp 24VDC monitor port AN 1 IN Vu 36VDC monitor port AN2 IN Printhead short circuit monitor port zu AN3 IN DIP switch 2 1 to 2 3 i AN5 AN6 Not used AN7 VAref IN Analog reference voltage input 4 7V Analog port power source RD OUT Read strobe signal output WR OUT Write strobe signal output ALE OUT Address Latch Enable signal output Low address 8 PFO OUT High address data 8 5 PDO IN OUT 8 bit address data bus f VDD Internal memory power source Main power sourse NOTE Direction on the signal flow is as viewed from the CPU 2 28 REV A 2 3 8 2 E05A15HA Gate Array Functions This gate array performs chip selection for the main components on the PEGX board under the control of the 78 10HG CPU The gate array also outputs the lower address signals AO through A7 for the ROM and RAM using
124. latches the data upon receiving the strobe signal and sets the BUSY signal HIGH inputs and outputs other control signals When a serial interface is used multiplexes the two receive data lines RXD and the seventh bit of the 8 bit parallel interface using internal logic and outputs the result to an external device Logically ANDs the two external reset signal inputs using internal logic and output the result to an external device one channel Output ports with different types of output General purpose input port Bi directional 8 bit data bus DB4 1 Vcc DB5 2 DB3 DB86 3 DB2 DB7 4 DB1 RXDIN 5 DBO RSTIN 1 6 WR D 7 RD RSTIN2 8 CS IN7 9 A2 IN6 10 A1 5 11 4 12 IN3 13 PA6 IN2 14 5 STRB 15 PA4 GND PA3 IN1 GND INO PB7 RSTOUT PB6 BUSY 5 4 PB3 ERR PB2 PC3 PB1 2 1 6 RXDOUT 5 PD1 PC4 PDO GND PAO PA2 Vcc PA1 Figure 8 GA E05A16GA Pin Diagram REV A Figure A 9 shows the gate array block diagram and Table A 9 lists the gate array ports function DB7 DBO PAT PAO INO STRB RSTIN2 4 Multiplexed Bl direction 8bit data bus DO Super Sub script Generator Buffer 24 bits Shift Register Gate Array Internal Reset Reset Logic Figure 9 GA E05A16GA Internal Block Diagram A 14 AC au mg L RXI RS ES Table 9 E05A16
125. lected directly using these switches Settings set using the SelecType mode are stored in the memory and are set on the panel when the printer hardware is initialized Normally the SelecType function is valid when not printing The printers have various other functions that can be selected from the control panel Figure 1 16 shows the control panel Figure 1 16 Control Panel Switches ON EINE rhet This button controls the printer s on line off line status When the printer is on line ONLINE light is on and the printer can receive and print data from the computer When this lamp is flickering the micro adjustment function can be used FORM FEED nee When the printer is off line press this button to eject a single sheet of paper or to advance continuous paper to the top of the next page LINE FEED ned nts When the printer is off line press this button to advance the paper one line or hold it down to advance the paper continuously 1 29 REV A LOADIEJECT RM This button is used to feed the paper to the loading positiorf kc or to eject paper when paper is already loaded Paper is ejected forward if the paper release lever is set to the single sheet position and is ejected backward removed from the paper path if the release lever is set to the continuous paper position FONT coc vade vc tee This button is used to select NLQ ROMAN NLQ SANS SERIF or DRAFT mode The yellow indicator light sho
126. lon C C w Carriage moves left to right b 1 2 Phase Excitation Figure 2 37 Carriage Motor Drive Sequence 2 45 REV A Drive Sequence When driving the carriage the phase excitation sequence differs depending the carriage speed and direction The table below shows the phase excitation sequences Table 2 7 2 2 phase Excitation Drive Sequence Left to Right Right to Left Phase C Phase D Phase B Phase C Phase D M ON Table 2 8 1 2 phase Excitation Left to Right Right to Left StpNo Phase A PhaseB PhaseC Phase D Phase B PhaseC PhaseD INR DEAL A NER SERIEN 2 1118 o8 ON ON 8 ON ON 2 46 OA tes ME REV A General Operation Figure 2 38 shows the block diagram of IC2A STK6722 The carriage motor has four coils A B C and D and each coil is driven by the corresponding phase driver A to D These phase drivers are switched directory by the output pulses from ports CRA to CRD of the gate array IC3A E05A15HA When the phase drivers are turned off the surge voltage e L X di dt generated from the coils of the carriage motor is applied to the surge voltage absorber via the flywheel diode attached to each phase driver and is absorbed This circuit drives the carriage motor using a co
127. not perform reverse feeding after the paper end has been detected Paper Loading Directions Fanfold paper Inserted from the rear side Cut sheet paper Inserted from the up side Line Spacing 1 6 or programmable min 1 2 16 i Line Feed Speed See Table 1 3 Table 1 3 Line Feed Speeds Type of Paper Continuous Feed Intermittent Feed Feed Speed Cut Sheet 48 ins line 71 ins line 3 5 see Fanfold 53 ins line 76 ins line 3 1 see Paper Specifications Cut sheet paper Refer to Table 1 4 Table 1 4 Cut Sheet Paper Specified Conditions 45 70 14 22 Ib Plain paper Copies Not available NOTE The form overriding mechanism enables printing as close as 13 5 mm from the bottom edge of the paper However paper feed accuracy is not guaranteed within about 22 mm from the bottom 1 4 REV A Fanfold Refer to Table 1 5 Table 1 5 Fanfold Paper Specified Conditions FX 850 FX 1 050 Width 101 254 4 0 10 0 101 406 4 0 16 0 Copies sheet 4 1 original 3 at normal temperature 3 1 original 2 at all temperature range Quality Plain paper Total Thickness 0 065 0 32 0 0025 0 01 2 mm Weight Kg Fanfold 45 70 14 22 Ib Multi part forms 34 50 X 4 Roll paper Refer to Table 1 6 Table 1 6 Roll Paper Specifications FX 850 only Width mm 216 3 Length mm Roll diameter not more than 127 mm 5 Thickness mm 0 07 0 09 0 0028 0
128. nstant current chopper type drive system Most of this circuit is included in the 4 phase stepper motor driver IC IC2A STK6722HA Chopper control is performed using a separately excited system oscillation frequency approximately 24 KHz The carriage motor supply voltages Vcas and Vcco are applied intermittently so that the coil current is kept constant 35Voc Surge Voltage Absorber 5 15 From 05 15 AO1 SC e Veco wheel diode woo Phase B Phase C Phase D Driver Driver Driver t 5 3 5 m 93 Lo ko c 1 90 5 9 iz t t amp 35 E 2 lt 645 5V PD of Vref E05A16GA From Reference Voltage Generation Circuit Figure 2 38 Carriage Motor Drive Circuit Block Diagram 2 47 REV A Detailed Operation Figure 2 39 When the 5V supply voltage is applied to the STK6722HZ 2 the triangular waveform circuit 4 in the H IC starts oscillation and outputs the reference signal approx 24KHz for chopper control Because the output of comparator 2 point is high input at the plus side gt input at the minus side when the printer power is turned on TR7 turns on and base current flows to TR 1 When a high signal AO 1 low is input to the base of TR3 turns on and coil current Ica flows from Vcc to TR 1 to phase A t
129. nted out under conditions that must be between 5 to 35 and 20 to 80 RH 4 Examples of labels AVERY CONTINUOUS FORM LABELS AVERY MINI LINE LABELS Lever Adjustment See Figure 1 5 and Table 1 9 Table 1 9 Lever Adjustment Lever Position Paper Thickness mm Head adjustment Lever 0 06 0 12 Forward am A n D 0 18 0 25 0 26 0 32 Figure 1 5 Head Adjustment Lever Positioning NOTES 1 When printing density becomes lighter set the head adjustment lever one position lower 2 When using thicker paper than shown in the above table set the head adjustment lever to the 6th or higher appropriate position by performing the self test operation Ribbon Cartridge See Table 1 10 Table 1 10 Ribbon Cartridge Specification Ribbon Model No 8755 M Printer characters 3 million 14 dots character Dimension mm X h X d 293 X 34 X 72 468 X 34 X 78 REV A Dimensions See Table 1 11 Details are shown in Figures A 45 and 46 Weight See Table 1 11 Table 1 11 Dimensions and Weight Weight Kg NOTE Excluding platen knob and paper guide Electrical Specifications See Table 1 12 Table 1 12 Electrical Specifications 120 V Version 220 240 V Version Voltage V AC 120V 10YO 220 240V 10 Frequency range Hz 49 5 60 5 Rating current A 2 1 Insulation resistance M ohm min 10 between AC line and chassis Dielectric strength V AC rm
130. o D5 to TR3to R 13 gradually increases due to the reactance of the motor coil Voltage Vri3 across limiter resistance R13 increases When Vr 3 becomes the same as the Vner at pin 8 from the reference voltage generation circuit the output of IC2 point goes low TR7 turns off and TR 1 turns off Then Ica starts decreasing When becomes less than the output of 2 goes high again The surge voltage also called flyback voltage generated when TR3 is cut off by the zener diode ZD 1 approx 47V between the collector and base of transistor Q5 and is absorbed by transistor Q5 to protect TR3 from being damaged When the carriage motor stops the motor drive pulses are fixed at a set value to hold the carriage motor At this time H IC is powered down to prevent it from overheating When the power down operation is performed when the carriage motor is held PD 1 of the E05A 16GA IC7A goes low 7 and TR 11 turns on to drop the reference voltage at the plus side of 2 As a result the load on is reduced and H IC is effectively powered down At this time approximately 5 is supplied to by PWM control a Peo m3 EOSA1SHA PO of EOSA16GA UC co Figure 2 39 Carriage Motor Control Circuit 2 48 REV A 2 3 5 2 Carriage Motor Software Control This section describes the carriage motor software control Software
131. o check for irregular printing or paper feeding Down loads special character to check dot alignment Checks the height lag during double height printing After repairing the printer this mode should be used to test the unit You can select the printer types interface types and mode of test print Function Check Final Check This mode is used to check ail of the printer function Bi Directional printing alignment check Bit Image Mode Down Load Printing Wire Pin Check Etc Mode Check H Character This mode is used to check all of the printing modes Bi Directional printing alignment check Etc zCG Table check This mode is used to check all of the characters in the CG ROM f 2 Draft mode 10 12 15 Pitch Roman Mode 10 12 15 PS Pitch Saris Serif Mode 10 12 15 PS Pitch REV A 5 2 6 PDOS for RAM and CPU Check If you want to run only the RAM check or CPU check you do not need the host computer Install the diagnostics ROM in the printer at location IC4A LOCATION NOTE Check does not require connection to a host FX 850 1050 IC4A computer PRINTER DIAGNOSTICS ROM Figure 5 7 RAM and CPU Check 1 Turn the power on 2 Check to see if the ONLINE LED light is on or off 3 Check to see if any LEDs are blinking POWER ON POWER READY PO ONLINE LEDs ON CHECK 5V LINE YES NO ALL LEDS TURNS OFF gt CPU DOES NOT WORK VES ONLINE LE
132. oltage drive circuit The phases of the paper feed motor are controlled by PFA PFD of the gate array IC3A E05A15HA 2 2 Phase excitation system is used The paper feed motor has one driving transistor per winding unipolar drive two driver s become active in the 2 2 phase excitation system Figure 2 45 shows the 2 2 phase excitation system 1 2 02 OFF C02 ON OFF Boa OFF 002 OFF LL Step 1 2 3 4 Rotation C C W C W Figure 2 45 Phase Excitation System 2 54 ra REV A Drive Sequence When driving the paper feed motor the phase excitation sequence differs depending the paper feed direction The table below shows the phase excitation sequence Table 2 11 2 2 phase Excitation Drive sequence Foward Feed Reverse Feed s dloa Joa o 2 ON ON 4 o ON ON NOTE If the paper feed motor is driven counterclockwise paper is fed in reverse 2 8 5 3 Paper Feed Motor Software Control This section describes the paper feed motor software control Software Control System The speed and rotational direction of the paper feed motor are controlled by the printer firmware Line spacing is also controlled by the firmware The minimum line spacing value that the user can set is 1 2 16 inch The printer supports the following three speed modes for paper feeding Table 2 12 Paper Feed Motor Speed Speed Mode Feed Speed Ex
133. onal movement of the paper feed motor is conveyed to the platen in the case of friction feed and to the push tractor unit the platen also rotates in the case of tractor feed The conveyance mechanisms are switched using the release lever The paper tension unit is mounted at the top of the platen and is rotated by the paper feed motor The paper ejection is assisted by friction between the platen and the paper tension unit 2 7 REV A 2 2 5 1 Push Tractor Feeding Method Figure 2 6 Paper feeding is performed by driving the paper feed motor with the paper release lever set forward to load fan fold paper into the tractor unit A paper tension unit is installed at the exit of the case to prevent irregular paper feeding and slackening Paper Release Lever Tractor Transmission Gear Paper Feed Transmission Gear i Side View ii Top View a Gear Arrangement Paper Tension Roller Paper Tension Support Roller Paper Holding Roller Paper Feed Roller Release State b Paper Path Figure 2 6 Push Tractor Feeding Method 2 8 hs r n REV A 2 2 5 2 Friction Feeding Method Figure 2 7 The paper is loaded from the upper paper entrance with the paper release lever set backward The paper is held against the platen by the paper feed roller and is fed due to friction with the platen and paper feed roller As in the push tractor feed method the paper tension unit is used to prevent paper feed
134. or paper feed motor and sensor Table 5 8 lists the specifications for these components use the printing test and also inspect visually Name Table 5 8 Electric Device List Description Carriage Motor Paper Feed Motor Plunger Type Voltage Coil Resistance Excitation Type Voltage Coil Resistance Excitation Type Voltage Coil Resistance 4 phase 200 pole stepper motor pu Driving 36VDC Holding 5VDC 11 Q 7 25 C phase 1 2 phase 2 2 phase 4 phase 48 pole stepper motor Driving 36VDC Holding 5VDC 78 Q 70 25 2 2 phase Solenoid Driving 36VDC Holding 5VDC No operation OV 22 02596 20 C REV A CHAPTER 6 MAINTENANCE 6 1 PREVENTIVE MAINTENANCE 6 1 6 2 LUBRICATION AND ADHESIVE APPLICATION 6 1 LIST OF FIGURES Figure 6 1 FX 850 Lubrication Point Diagram 1 62 Figure 6 2 FX 850Lubrication Point Diagram 2 6 3 Figure 6 3 FX 1050 Lubrication Point Diagram 1 6 4 Figure 6 4 FX 1050 Lubrication Point Diagram 2 6 5 Figure 6 5 Adhesive Application Point nne 6 6 LIST OF TABLES Table 6 1 Lubricants and Adhesive 6 1 Table 6 2 6 1 Table 5 3 Adhesive Application
135. orts repair repoir PEGX board component repair Foult is corrected Figure 5 1 Troubleshooting Procedure Table 5 1 lists the troubleshooting tools contained in the printer Table 5 1 Troubleshooting Tools Tool No Description Part No Diagnostic Tool Use together with EPSON PC EQUITY QX 16 B765 109701 5 1 REV A 5 2 DIAGNOSTIC TOOL Due to the complex nature of printer long experience and much effort are usually required for effective trouble shooting a diagnostics tool however provides operators with an easier and more straight forward way of diagnosing and correcting printer problems 5 2 1 PDOS System Feature The diagnostics tool designed especially for use with EPSON printers is called PDOS Printer Diagnostics Operation System PDOS can be used for maintaining analyzing and testing all of your printer functions This documentation describes how to use this tools for your work This program can be used on any MS DOS host computer If it is used on another computer the appropriate MS DOS system and GWBASIC EXE will be required The EPSON printer diagnostic tool PDOS has the following features Easy parts level repair A simple structure using a host computer with MS DOS one flexible disk containing the programs and a diagnostics ROM EPSON supplies only the diagnostics ROM and the flexible disk B765 109701 PDOS For FX 850 1050 with IBM PC QX 16 Expertise with printe
136. oval Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Separate the main and base frame units Refer to Section 4 2 5 1 2 Step 3 Press the six tabs for the ribbon driver unit at the bottom of the base frame and remove it Tab Figure 4 39 Ribbon Driver Unit Removal mi REV A 4 2 5 14 Carriage Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Separate the main and the base units Refer to Section 4 3 5 1 1 Step 3 Remove the RE 3 securing the loading lever of the plunger to paper holding lever L Step 4 Remove the two HNO 4 nuts from the side frame L Step 5 Remove the HNO 4 nut from the side frame R Paper Holding lever L RE 3 HNO 4 Plunger Plunger Lever a Left Side View HNO 4 b Right Side View Figure 4 40 Carriage Removal Step 6 Spread both frames L and R apart and remove the carriage guide shafts A and B 4 29 REV A Side Frame L Side Frame R po Carriage Carriage Guide Shaft A Carriage Guide Shaft Figure 4 41 Carriage Guide Shafts A and B Removal 204 i Step 7 Pull the carriage out from the carriage guide shafts A and B ASSEMBLY POINTS 1 While passing the carriage guide shaft B through the carriage fit the felt to the bottom of the carriage 2 Set one LS 6 X 0 15 X 1 1 and the parallel adjustment bush to the right side of the carriage guide shaft B NOTE L
137. pply Circuit Unit Repair cent d Check Point Solution IC 1A is Observe the oscillation waveform and the switching Replace IC 1A defective waveform 0 1V DIV 20us DIV Oscillation Waveform Pin 2 of IC 1A TH 10V DIV 20us DIV Switching Waveform Pin 1 1 of IC 1A Transistors Observe the chopping wave form Replace 01001 Q10and Q11 011 defective 0 10V DIV 20us DIV Chopping Waveform Emitter of 010 Q23 Q30 and Observe the Vx voltage when printer power is turned on Replace O23 ZD 10 defective or ZD1 Emitter Collector 2V DIV 5us DIV Vx Voltage Waveform 023 REV A 5 3 2 Control Circuit The control circuit can be repaired using the diagnostic tool to identify the problem Table 5 7 lists the main parts of the control circuit Location 4B 3A 7A 5A 6A 2A 4A Q1 09 Q16 Q15 017 18 021 022 025 0 023 024 Table 5 7 Control Circuit Parts List Name nu PD7810HG E05A15HA E05A16GA HM6264ALSP STK6722H 27256 25 3987 25 765 2SB1318 2SD560 4 25 1815 25 1015 Description Main CPU 15 MHz Gate Array Gate Array Static RAM 64K bit Hybrid IC Carriage Controller 32K Byte P ROM 60V 10V 3A 2W 120V 1 5W EE 100V 3A 1 2W T 120V 5A 1 5W 60V 150mA 400mW 50V 150mA 400mW 5 4 3 Model 3 B10 3B60 Printer Mechanism Use the diagnostic tool to detect malfunctions among the carriage mot
138. r mechanisms or circuits is not required to repair a printer No need for a circuit diagram of the printer wide variety of possible uses ranging from repair and analysis to testing 5 2 2 System Overview HOST COMPUTER LOCATION FX 850 IC4A MS DOS FX 1050 DIAG PRINTER NOSTICS EPSON PC QX 16 go q e 1 FLEXIBLE NOTE The parallel I F cable is DISK used when selecting the DPOS SYSTEM test print mode Figure 5 2 System Overview 5 2 om awn REV A In this system a printer is connected to an MS DOS based computer using a parallel interface cable with the diagnostics ROM installed inside the printer at location IC4A This system works as follows The host computer displays the DIP switch configurations necessary for performing diagnostics on the printer The user sets the corresponding switch on the printer and turns the printer power on The CPU in the printer reads the DIP SW and performs the diagnostics program that depends on the DIP SW values 5 2 3 How to Select The Host Computer This flexible disk can be used on EPSON PC EQUITY or the QX 16 to select the computer 1 Active the MS DOS system for your host computer 2 Remove the MS DOS system disk 3 Place the PDOS system disk in drive A 4 To use PDOS on EPSON QX 16 type gt To use PDOS EPSON EQUITY type A CC IBM 5 The host computer is now selected NOTE Default setting is the EPSON PC EQUITY 5 2 4 S
139. rements Thin 0012 20 20 20 6D 61 69 6E 20 66 65 61 74 73 72 5 73 main features 0014 20 61 72 65 20 8172 20 66 F 6r 77 73 era as follows 0015 OA oa 20 20 20 2 20 4D 61 78 2 20 70 72 PETERE Max 0016 49 6E 74 59 6E 67 20 73 70 65 65 64 3A 20 20 32 inting speed 2 0017 36 34 20 42 50 53 20 28 44 72 61 66 74 20 61 6E 64 CPS Draft 0018 64 20 45 69 74 65 29 OD OA 20 20 20 20 20 20 d Elite 0019 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 001A 20 20 20 20 20 32 z2 30 20 43 50 53 20 28 44 72 220 epg Dr OO1B 51 66 74 20 61 64 20 50 6 63 61 29 OD OA OD eft and Pica OO1U 20 20 2 PA 20 41 64 74 61 63 65 64 20 70 Advanced p 0010 61 70 65 72 20 68 61 6E 64 69 amp E 67 20 66 75 eper handling fu OO1E 6E 63 74 69 6F 7S 3 amp 20 20 41 75 74 20 74 nctions auto t OO1F 65 61 72 2D 66 66 OD OA 20 20 20 20 20 20 20 ear off 0020 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0021 20 20 20 20 20 20 20 2020202020 213 202020 0022 2020 41 75 74 amp F 20 61 64 69 6E 67 Auto loading 0022 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0024 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0025 20 20 20 20 20 20 20 20 20 41 75 74 F 20 62 bl Auto ba 0026 623 6B 2D 6F 75 74 OD OA 20 20 20 20 20 20 20 20 ck out 0027 20 20 20 20 ZO 20 20 20 20 20 20 20 20 20 20 20 0028 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0029 20 4D 69 63 72 6F 2
140. rive Pulse CRA f OUT Motor Control Port Carriage Motor CRD OUT Cartridge output signal P ou output Port Write Strobe signal Rm Read Strobe signal Al 3R Al 4R Address output signal 2 f Address Input signal 5 f OUT Address output signal A2 CTRG ON Cartridge signal ALE ON Address Latch Enable signal CTRG IN Cartridge signal A 9 REV A Pin No 51 j 55 56 j 60 61 J 63 64 NOTE Direction refers to the direction of signal flow as viewed from the gate array Table 7 05 15 Port Functions cent d Signal Name Direction f OUT f IN OUT Function Address output signal Input Output Data Bus Input Data Bus 5V 1 Fasch wet Address OOH OIH 02H 03H 04H READ WRITE READ REV A Table 8 GA 05 15 Control Functions Control Functions None WRITE READ WRITE READ WRITE READ WRITE READ WRITE Data is set to the mode register Bit 7 Bit 6 Bank 1 Bit 5 Bank O Bit 4 Carriage motor rotation 1 Counterclockwise L Clockwise L Bit 3 Carriage motor phase switching 1 Direct control Automatic control Bit 2 Paper feed motor rotation 1 Clockwise Reverse O Counterclockwise Forward Bit 1 Paper feed motor phase switching 1 Direct control Automatic control Bit O Automatic h
141. rs to the direction of signal flow as viewed from the gate array e REV A This gate array is accessed by READing and WRITEing the memory mapped 1 0 addresses MM IO using the internal address decoder The MMIO Ports for this gate array are OOH to 07H accessed by the lower three bits AO to A2 of the address bus Table A 1 O shows the operation of the memory mapped O addresses Table A 10 GA E05A16GA Control Functions Control Functions OOH READ PA7 O gt 0 7 0 Read The data is inverted WRITE DB7 0 PB7 O Write The data is inverted 01 H READ IN7 0 gt DB7 0 Read The data is inverted WRITE DB7 0 gt PC7 O Write The data is inverted except bit and 1 02H READ Read hard ware BUSY signal DBO When DBO is high parallel data is latched in gate array WRITE Write interface parameter to interface control port Bit7 Print data 1 bit is print data 1 bit is print data Bit 6 Acknowledge signal O inactive state 1 active state Bit5 Busy signal O High level is active state 1 Low level is active state Bit 4 Software Busy signal O Software Busy state 1 Ready state Bit 3 signal O inactive state 1 active state Bit 2 signal O inactive state 1 active state Bit1 Serial data input selection 0 1 7 1 RX DIN BitO Parallel data latch timing O Rising edge of STRB 1 Falling edge of STRB 03H READ Read the converted Italic CG
142. s 1250 1 minute between AC line and chassis Environmental Conditions Refer to Table 1 13 Table 1 13 Environmental Conditions Storage Operating Temperature 30 60 Humidity RH Resistance to shock G within 1 ms po Resistance to vibration 55 Hz max 0 50 Reliability MCBF 5 million lines excluding printhead MCBF Mean Cycles Between Failure MTBF FX 850 4000 duty 25 FX 1050 6000 duty 25 Printhead life 100 million characters 14 dots character REV A Safety Approvals Safety standards UL4785th U S A version CSA22 2 220 VDEOB806 TUV European version Radio Frequency FCC class U S A version Interference VDE871 European version 1 2 2 Firmware Specifications Control Code ESC P 83 Printing Direction Text Bidirectional printing with logic seeking Bit image Unidirectional printing Character Code 8 bits Character Set 96 ASCII and 13 international character sets Graphics Font NLQ Roman 10 12 15 Proportional NLO Saris serif 10 12 15 Proportional Draft 10 12 15 Proportional Printing Mode Printing quality Draft NLQ Character pitch 10 12 15 CPI or Proportional Condensed Double width Double height Emphasized Double strike Italic Underlined NOTE A condensed mode for 15 characters is not available Print Speed Refer to Table 1 14 Table 1 14 Print Speed Type of Letters Print Speed cps Draft pica 220 107 Draf
143. sition it where move smoothly the cylinder and tight screws Figure 4 29 Plunger Positioning 4 22 pe pn REV A 4 2 5 10 Platen Unit Removal Step 1 Remove the upper case Refer to Section 4 2 1 Step 2 Remove the two CBNS 3 X 6 screws securing the platen cover to side frames L and R then remove the platen cover CBNS 3x 6 Right Shaft Holder Platen Cover Platen Figure 4 30 Platen Cover Removal Step 3 Push on the right shaft holder clip and rotate it forward Step 4 Remove the platen unit by moving it to the right side while pulling paper holding roller shaft forward Right Shaft Holder Figure 4 31 Platen Removal 4 23 REV A 4 2 5 11 Paper Release Lever Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the paper feed motor and transmission gears Refer to Section 4 2 5 7 Step 3 Remove the platen unit Refer to Section 4 2 5 10 Step 4 Press the paper release lever tab at the inside of the side frame R then remove the lever LEY Tab Paper Release Lever Figure 4 32 Paper Release Lever Removal 4 24 REV A 4 2 5 12 Main and Base Frame Removal Step 1 Remove the printer mechanism Refer to Section 4 2 5 1 Step 2 Remove the printhead Refer to Section 4 2 5 2 Step 3 Remove the carriage motor Refer to Section 4 2 5 4 Step 4 Remove the belt driven pulley Refer to Section 4 2 5 5 Step5
144. t consists of following sections Filter CIrCUIL eroe tin ene er e een Section 2 3 2 1 Section 2 3 2 2 Ractifier and Smoothing Section 2 3 2 3 Chopper Type Switching Regulator Section 2 3 2 4 Pulse Width Modulation 2 Section 2 3 2 5 LEO Ee MERE Section 2 3 2 6 LRL Bin CUTE Section 2 3 2 7 9 12VDC Supply Circuit icem Section 2 3 2 8 Vx Voltage Supply Section 2 3 2 9 2 15 REV A 2 3 2 1 Filter Circuit r AC line voltage passes through the power switch then is input to the filter circuit A fuse F1 is used on the PEBFIL I board The filter circuit attenuates external noise and inhibits noise generated in the printer from going out via the AC line Either C 1 or C2 drains leakage current between the primary coil and the case Figure 2 1 1 shows the filter circuit o 220 240V Version Only 1 2A 125V 100V Version 2 125V 120V Version 1 25A 250V 220 240V Version Figure 2 11 PEBFIL H Filter Circuit Board 2 3 2 2 Transformer AC Voltages 120 VAC 220 VAC 240 VAC that pass through the filter circuit are divided into 26 VAC and 12 VAC and supplied to the PEGX circuit Figure 2 1
145. t elite 264 1 28 Condensed draft pica 183 91 Emphasized draft pica 107 NLQ normal pica 45 NOTE When any italic character is in the same line the print speed will be reduced to the value in the parentheses REV A Print Columns Refer to Table 1 15 Table 1 15 Print Columns Printable Columns cpl Type of Letters FX 850 FX 1 050 Normal 80 136 Condensed 137 233 Elite 96 163 Condensed elite 160 272 NOTE In Condensed mode printable column is always 137 Previous FX series is 132 Character Size Pitch Refer to Table 1 16 Table 1 16 Character Size and Pitch Character Pitch mm 2 54 1 O cpi 2 54 1 O cpi 1 48 17 cpi 2 11 12 cpi Condensed elite 085 1 27 20 cpi NOTE Width of Elite character is changed to 1 7 mm from 2 1 mm not same as normal mode REV A 1 3 INTERFACE OVERVIEW f The FX 850 1 050 has 8 bit parallel interface as standard 1 3 1 8 bit Parallel Interface Specifications Data Transmission Mode 8 bit pallarel Synchronization By STROBE pulse Handshaking By BUSY and ACKNLG either or both Logic Level TTL compatible Data Transmission Timing See Figure 1 6 Connector 57 30360 AMPHENOL or equivalent See Figure 1 7 BUSY ACKNLG DATA STROBE 0 5 us 05 5 0 5 us min min min NOTE Transmission time rising and falling time of every input signal must be less than 0 2 us Figure 1 6 Data Transmission Timin
146. the motors sensors and printhead are also included on this board Other main ICs on the PEGX board are Universal IC e STK6722HZ 2 Carriage Motor Driver NJM2355 Switching Regulator Gate Array E05A15HA Paper Feed and Carriage Motors controller and Printhead driver EQ5A16GA 1 7 HOSt computer interface Memory IC 4 Program ROM 256 e S RAM ICBA and 6 Buffer and Back up memory GA E05A15HA S RAM 8 KBX2 Lithium Battery DIP Sw2 DIP SW1 iav egre m CPU PPD7810HG GA E05A16GA Figure 1 14 PEGX Board 1 11 3 PEBFIL I Board Filter Board and Power Transformer The DC power supply circuit is on the main board The PEBFIL II board and power transformer remove noise from the AC power supply section and drop the AC input voltage Figure 1 15 shows the 4 board and power transformer 220 240V 120V 220V 240V 120V Figure 1 15 PEBFIL II Board and Power Transformer REV A 1 11 4 PGPNL Board Control Panel There are 11 LEDs seven switches and a buzzer on the control panel Among these seven LEDs and three switches are for the panel setting function SelecType Font character pitch and condensed mode can be se
147. the program press function key no 1 IFI and then the enter key to re start program 2 If you want to skip any file or program then press the ESC key If you want to return to a previous file or program then press DEL key REV A 5 3 UNIT REPLACEMENT This replacement is based on system analysis According to the particular symptom found by the multimeter the units listed in Table 5 3 need to be replaced Table 5 3 Unit Parts List Name Description Part No Fuse 120V 125V 2A X50206 1011 220 240V 250V 1 25A X502063040 PEGX Boards Main Circuit Board 46 1201000 PEBFIL II Board 120V Filter Board Y566204200 220 240V Filter Board Y566204000 Power Transformer 100V FX 850 Y566503000 120V FX 850 Y566504000 220 FX 850 Y566505000 240V FX 850 Y566506000 100V FX 1 050 46 1502000 120V FX 1 050 Y46 1503000 220V FX 1 050 Y46 1504000 240V FX 1050 Y46 1505000 Model 3B 10 Printer Mechanism FX 850 Y46 1590100 Model 3B60 Printer Mechanism FX 1050 Y462590100 PGPNL Board Control Panel Y46 1501000 REV A Symptom Printer Does Not Operate with Power Switch ON Table 5 4 Symptom and Reference Pages Problem Indicators No indicator on the control panel lights Carriage does not move mm Reference Page 5 11 Carriage moves away from home position at power ON Abnormal Carriage Operation Incorrect Printing in self test with Normal Car riage Operation Abnormal Paper Fe
148. tion After paper loading is completed set the printer ON LINE by pressing the ON LINE switch In this state the paper loading position can be finely adjusted by operating the LF and FF switches When the printer is in the micro adjustment mode the ON LINE LED on the panel blinks The paper loading position can be adjusted individually for the friction feed tractor feed and cut sheet feeder modes and the adjusted values are stored in the memory The value for the tractor feed remains valid even after the printer power is turned off NOTE If paper is already loaded when the printer power is turned on the position of the paper will be recognized as the TOF position 1 23 REV A Ph 1 10 PAPER END DETECTION The paper end is detected by the PE sensor When the paper end is detected the printer indicates it by lighting the lamp on the control panel and ringing the buzzer The printer sets the parallel interface signals as shown below and enters the OFF LINE mode BUSY signal HIGH PE signal HIGH ERROR signal LOW After the paper end is detected load a new sheet and press the ON LINE switch so that the printer enters the ON LINE mode Figure 1 10 shows the paper end detection position i Printable Area Paper End Detection Position Approx 59 9 XYZ Fig 1 10 Paper End Detection Position 1 24 REV A 1 11 MAIN COMPONENTS The FX 850 1 050 printer includes the following major subassemblies Model
149. to disconnect the power cord and interface cable and remove the paper installed in the printer Step 1 Remove the platen knob Step 2 Remove CBB 4 X 12 screw securing the upper and lower cases Figure 4 7 Upper Case Removal Step 3 Detach the upper case by pressing in on the two retaining clips These clips are located on both side of the printer case Step 4 Disconnect connector CN 11 which connects the PEGX board Step 5 Remove the upper case ASSEMBLY POINT Before setting the upper case back onto the lower case adjust the paper release lever toward the back 4 7 REV A 4 2 2 Control Panel Removal Step 1 Remove the upper case Refer to Section 4 2 1 Step 2 Remove the control panel from the upper case depressing two hooks Control Panel Figure 4 8 Control Panel Removal 4 2 3 Push Tractor Unit Removal Remove the push tractor unit before removing the circuit boards and the printer mechanism from the lower case Step 1 Remove the upper case Refer to Section 4 2 1 Step 2 Remove the two CPS O 3X 6 screws securing the push tractor to the printer mechanism Step 3 Remove the push tractor unit by pushing it to the back CPS O 3x 6 Push Tractor Unit Figure 4 9 Push Tractor Unit Removal 4 8 4 2 4 Circuit Board Removal This printer includes two circuit boards the PEGX controller circuit board and PEBFIL II filter circuit board CAUTION
150. tor with carriage motor mounting plate and carriage motor mounting bushes on base frame by lightly tightening two CPS 0 3 X 10 screws 3 Attach the timing belt tension spring to hooks on both the base frame and carriage motor mounting plate 4 Tighten the screws on the carriage motor mounting plate 4 2 5 5 Timing Belt Belt Driven Pulley Removal Stepl Remove the printer mechanism Refer to Section 4 2 5 1 Step2 Remove the timing belt tension spring Step3 Loosen the two CPS O 3 X 10 screws which fixing carriage motor mounting plate to the base frame Step4 Pull the timing belt out from carriage motor pulley Step5 Place the carriage over the notch in right side of the base frame and release the engaged parts of the timing belt and carriage from the bottom side of the base frame Step 6 Remove the belt driven pulley by moving it to the left and remove the timing belt Belt Driven Pulley Timing Belt Printhead Position Timing Belt Tension Spring Figure 4 22 Timing Belt Removal Engaged Part Carriage Bottom View Timing Belt Figure 4 23 Timing Belt Insertion ASSEMBLY POINTS 1 Verify that the timing belt runs around the belt driven pulley and the belt driving pulley of the carriage motor shaft 2 Insert the timing belt firmly into the carriage utilizing the notch in the base frame in the same way as when removing it
151. uit Printing is controlled by the CPU uPE78 10HG gate array EO5A 15 nine drive transistors and printhead Print data output from the CPU is stored in the buffer of the E05A15HA gate array The printhead drive pulse output from PC6 of the CPU enables the buffer is the gate array and the 9 bits of print data stored in the buffer are output to turn on or off the printhead drive transistors so that the drive voltages are applied to the printhead coils Figure 2 50 shows a block diagram of the printhead control circuit E CPU MPD7810HG GA E05A 15 Printhead C3987X9 1 Figure 2 50 Printhead Control Circuit Block Diagram DRM REV A Printhead Drive Pulse Width Control The width of the printhead drive pulse is controlled by the CPU uPD78 10HG The CPU monitors printhead drive voltage VP 24 V at ANO controls the width of the printhead drive pulse output from PC6 of the CPU by making it longer or shorter according to changes in the drive voltage so as to keep the drive voltage constant in order to stabilize print quality See Figure 2 50 Figure 2 51 shows the relationship between printhead drive voltage and print drive pulse width 350 Print Drive 340 Pulse Width 330 Drive Voltage Vp Figure 2 51 Print Drive Pulse Width 2 61 REV A Half dot Protection Circuit The half dot protection circuit is located the gate array EO5A1 5HA It ignores any drive pulses
152. user of the type of error using buzzer sound patterns If an error occurs the printer is set OFF LINE and the drive voltage is cut off so that damage to the circuits can be minimized Types of errors descriptions and printer states are as follows Carriage Errors The buzzer beeps 6 times pausing briefly after third beep Error status home position sensor indicates home position when the carriage cannot be at the home position home position sensor does not indicate home position when the carriage must be at the home position Printing has not been completed when the carriage is in the deceleration mode After a home position seek is executed the carriage does not return to the home position Printing is not completed after the carriage reaches the home position Abnormal Voltage The buzzer beeps 5 times with a pause after every beep abnormal voltage has been detected on the 24 VDC line The 24 V VP is monitored at ANO of the CPU If the voltage 25 V is 28 4 V or more or 19 6 V or less the printer enters an error state Shorted Printhead Drive Transistor The buzzer beeps 10 times with a pause after every beep When the printer power is turned on the drive transistor is checked for shorts during the printer initialization sequence During printing the printhead drive circuit is checked for shorts each time printing of one frame is completed The state of the printhead drive trans
153. ws the selected font This button is used to select 10 CPI 12 CPI or PS proportional spacing The yellow indicator light shows the selected pitch CONDENSED ooa as This button is used to select or deselect the condensed mode The yellow indicator light is on when the printer is in the condensed mode In this mode all characters are printed at approximately 6096 of their normal width t LEDs POWER On when the POWER switch is on and power is supplied READY Green On when the printer is ready to accept input data This LED flickers while data is printed PAPER OUT On when the paper end sensor detects that the printer is out of paper E REV A 1 11 5 Housing The housing consists mainly of the upper and lower cases The components described in the former sections 1 11 1 through 1 11 3 are accommodated in the lower case Other components are the paper feed knob paper separator and printer cover The DIP switch position is changed from the rear side of the printer conventional to the right side A removable cover is located on the upper case so that the DIP switches on the optional board can be set without removing the upper case Figure 1 17 shows the upper and lower cases FX 1 050 Figure 1 17 Housing 1 31 REV A CHAPTER 2 OPERATING PRINCIPLES 2 1 GENERA
154. ystem Activation After the system has been connected as shown in Figure 5 2 turn on the Host Computer and place the system disk in drive A The main program is automatically activated and displays the initial screen message shown in Figure 5 3 FX 850 1050 MAINTENANCE PROGRAM PROGRAMMED BY EPSON JAPAN VERSION 1 0 1 987 NOV 3RD PUSH ANY KEY TO START THIS PROGRAM Figure 5 3 Initial Screen 5 3 REV A Next press any key to display the manu screen DIAGNOSTICS PROGRAM FOR FX 850 1050 1 MANUAL MODE 2 AUTO FILE MODE 3 AUTO MODE WITH OSCILLOSCOPE 4 TEST PRINT MODE 5 RETURN TO SYSTEM MS DOS PLEASE SELECT MODE 1 TO 5 Figure 5 4 Menu Screen Mode Screen 5 2 5 Mode Selection This system includes four different modes which the level of repair or the type of diagnostics to be performed After reading the descriptions select the mode best suited to your needs Each mode is described below 1 Manual Mode This mode is selected by choosing No 1 on the menu screen It should be selected if the symptom or cause of the trouble is somewhat apparent or if the cause of the trouble was determined using an oscilloscope or other test equipment Figure 5 5 shows the menu screen for the Manual Mode 01 POWER HEX 02 TEMP HEX 03 COLUMN HEX 04 CG HEX 05 SW HEX 06 SWLED HEX 07 HOME HEX 08 PE HEX PLEASE SELECT TEST FILE NUMBER Figure 5 5 Manual Mode Menu Screen As shown in Figure 5

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