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SERVICE MANUAL

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2. IC2 M62 53 Toner density signal Toner sensor Developer Developer material unit nV RAM IC9 5V 2 1 5 019 3 920 1 3 PWA F LGC Oct 1995 O TOSHIBA 10 11 1550 DEVELOPER Operation of auto toner sensor 1 Functions of auto toner sensor Initialization adjustment function When new settings are entered or when developer is replaced Automatic or semi automatic adjustment is made so that the output of the auto toner sensor will be 2 3 2 5 V input of IC8 against the toner density of the new developer material Toner density stabilization function During copying operation Toner consumption gt toner density decreases gt auto toner sensor output changes are detected gt toner motor is driven gt toner is supplied to developer unit from toner cartridge toner density is maintained at a constant level O Toner empty detection and release function Detects toner empty state inside toner cartridge Drives toner motor gt auto toner sensor output is not changed gt toner density does change gt judges that there is no toner toner empty Release of toner empty state Toner cartridge replacement gt drives toner motor gt auto toner sensor output changes gt toner density returns to normal value gt toner empty state is released 2 Operation of auto toner sensor The auto toner sensor is composed of t
3. Clip Plate spring Front side Bushing Clutch Oct 1995 O TOSHIBA 6 Removing one setscrew allows the clutch and the aligning roller lower to be disassembled respectively Also the aligning roller upper Setscrew can be removed Clutch Aligning roller upper Aligning roller lower Notes 1 During disassembly be careful not to damage the mylar 2 Pay attention to the orientation of the clutch projection Clutch projection Oct 1995 O TOSHIBA 8 7 1550 FEEDER 8 3 2 Lower paper feed unit 1 Pull out the cassette 2 Remove the upper paper feed unit 3 Remove the feed side cover and right side cov ers lower upper 4 Remove the separation roller The roller unit can be removed by pulling it to ward you Separation roller Cover Clutch spring Separation roller Holder 5 Disconnect two connectors and remove three screws Slide the whole unit toward the front then lower it and pull it out toward you Note that the feed roller can be removed with out taking out the whole unit Just remove the grip and pull out the roller from its shaft Feed roller 1550 FEEDER 8 86 July 1996 TOSHIBA Empty switch e Remove the rail unit 2 screws and connec tor T 3 0 as aime 1 Slide the rail unit toward the front and lo
4. NOLdO LNIH H 9NIH M SNIH H 700 500 200 T H LdO PNIY Y NIH M CNIH M TNIH H 000 T gzTH 8 NZZMOT T ONIH M 60215 50215 20215 10215 ms awa 5 Urina WNL IN S WOH SNT MOH D4D LNIY X 9NIY M SNIY X y NI8 X NIN M ININ X ONLY X Oct 1995 O TOSHIBA 14 2 1550 CIRCUIT DIAGRAMS Logic Circuit PWA F LGC 3 8 Oct 1995 O TOSHIBA D 0 15 D 0 15 0 15 0 15 STORE STORE 37 A15 36 A14 35 A13 A12 11 10 31 w w jw N jw as 7 w E C40 SKT A15 A14 A13 A12 A11 A10 gt gt 27 2100150 0 1 25 GND j 4 o o I STORE WRRAM CSSRAM CSSRAM css 1 0 1 25 VDD GND NC IC9 10 68 45 LNS D LNS C LNS B LNS A CTR ON PKUPCLT FEDCLT RGTCLT HINT LNS D LNS C LNS A 24 0 1 25 3 c32 1 25 PKUPCLT RGTCLT C58 0 1 25 5 GND1FIN GNDOFIN 5 12 1 10 VDD1 VDDO GND3 GND2 GND1 GNDO GND1FIN GNDOFIN 4 62308 GND1FIN GNDOFIN IC8 How to search
5. Mirror 6 Paper stop switch MY 1004 7 gt ee Slit glass Separation roller ae Auto exposure PC board Feed roller Lens Pick up roller Jh Original cover Heat roller Original glass Heat roller lower Main charger Cleaning felt roller Discharge lamp Thermistor Ozone filter Thermostat LED erasing array Heater lamp Main blade Separation claws Recovery blade Exit switch Toner recovery auger Exit roller upper Transfer charger Exit roller lower Separation charger Discharge brush Drum Fuser guard Air filter Pre transfer bias guide e Cleaning blade Transport guide Paper empty switch Empty switch MY 1004 Oct 1995 O TOSHIBA 2 1 1550 GENERAL Scanning motor Carriage drive wire Lens motor 64 69 Mirror motor Developer unit drive gear Drum gear Main motor Heat roller gear Exit roller gear Aligning roller clutch Transport roller clutch MY 1004 Cassette Feed roller clutch Pick up roller clutch PFU cassette MY 1004 PFU feed roller clutch MY 1004 PFU pick up roller clutch MY 1004 PFU drive motor MY 1004 1550 GENERAL 2 2 Oct 1995 O TOSHIBA 2 1 2 Electrical parts location diagram A DC elec
6. DE CNT 5 lt DFRXD 6 lt DFTXD ACKB DF cco 1 25 47 16 S REQ REQ S S CNT SRXD STXD ACKB S DFACK DF REQ REQ DF DF CNT DFRXD DFTXD ACKB DF 0 1 25 Je CC0 1 25 F 0 1 25 0 1 25 Je 0 1 25 F 0 1 25 0 1 25 0 1 25 CC0 1 25 0 1 25 0 1 25 Je 0 1 25 0 1 25 cco 1 25 Je cc0 1 25 0 1 25 7p 7p We 0 1 25 7p Je cco 1 25 0 1 25 0 1 25 cco 1 25 CC0 1 25 26 cco 1 25 cco Je 0 1 25 CC0 1 25 Je 0 1 25 Oct 1995 TOSHIBA How to search where signal in circuit diagram has jumped to 14 2 Power Supply Circuit PWA F PWR
7. MRR HOME PWA F AES 2 2 SNR ATS J88 424V i DG 489 24v 12 4532 24v 1 24V 2 ba gt DG 4 MAIN MOT Fl vi 43 1 1 MRR MOT D 424V im 2 2 MRR MOT C 424V 2 2 3 3 MRR24V DG 3 3 4 4 MRR MOT B DG 4 4 5 5 MRR MOT A VDD 5 5 6 6 GND GND 6 6 7 7 MRR HOM 45VE 7 7 8 8 GNDE 8 8 9 9 24v zc 9 10 10 AES VIN 10 10 25 111 11 GND SSR 11 11 Ts BS 12 424V AGORF 2 5 SCN MOT D J4 3 4 SCN MOT C VDD 1 7 4 3 SCN MOT B LNS HOM 2 2 5 2 SCN MOT A GND 3 3 e 1 24V OPT FANF 4 4 LNS MOT D OT F ON 5 5 LNS MOT C EX FAN 6 6 24V EXT FON 7 7 LNS MOT B EXT FAN2 8 8 LNS MOT A EXT FON 9 9 424V 10 597 K CTR 11 2 3 3 3 MOT DIR SS 112153 2 4 VDD 13 4 1 5 5 MOTBRK CRG HOM 14 5
8. TOSHIBA SERVICE MANUAL 1550 PLAIN PAPER COPIER PAPER FEEDING UNIT MY 1004 Click the Page Only button to close the overview area of the window Click the Bookmarks and Page button to open the Contents and display bookmarks created for the document Click a bookmark s name to go to the Page marked by that bookmark Click the Thumbnails and Page button to open the overview area and display thumbnail images of each document page Click a thumbnail to go to the page marked by that thumbnail Copyright TOSHIBA CORPORATION 1995 ALL RIGHTS RESERVED GENERAL PRECAUTIONS REGARDING THE INSTALLATION AND THE SERVICE OF THE 1550 MY 1004 1 Transportation Installation When transporting installing the copier using two persons be sure to use the positions as indi cated below The copier is fairly heavy and weighs approximately 35 kg 76 8 Ib therefore pay full attention when handling it 4 portions 2 Installation Be sure to use dedicated outlet with AC 115V 15A 220V 240V 10A or more for its power source The copier must be grounded for safety Never ground it to a gas pipe or a water pipe Select a suitable place for installation Avoid excessive heat high humidity dust vibration and direct sunlight To insure adequate working space for the copying operation keep a minimum clearance of 80 cm 31 57 on the left 80 cm 31 5 on the right and 10 cm 3 97 in the rear 3 Service of Machines Basically
9. Bypass feeding is possible flashes The symbol is displayed when the toner in the toner cartridge runs out PRINT key flashes The key flashes in red to indicate that the key copy counter has been with in red drawn when the optional key copy counter is installed er flashes The symbol is displayed when the toner bag is full S flashes When the paper is jammed the position is indicated 4 Paper feed 2 Exit paper area 3 Paper feeding unit option 4 Sorter option 5 DF option Y flashes The symbol is displayed when a malfunction requiring service has occurred 4 4 flashes The symbol is displayed at the periodic maintenance cycle When the PM counter has exceeded the PM set value Capable of copying 1550 DISPLAY 5 2 Oct 1995 TOSHIBA 5 3 Relationship between Machine Condition and 5 Action SPU0988 Gp JO jou SI USYM Ajeoneuojne iw 1dNuajUu eu 80N ajqissod jo ssed q Buunq 4 01 JoPEoIPUI doo au ueuM Buikdoo zou au uonounj dos au jo uondnaeju 77777 snjeis y Buiwojo eui ui 5
10. 5 4 1001 9001 4001 voor ew ow TV ov adda 8 25 215 21215 TTZIS 01215 V 8 OOLPMOT T 001 LEO e Nf KJE 9 0 seo Ed 254 zeo sin QI NNN LA a zlat jy LSTA ST 0 ST 0 v ST 0 ST 0 a TEO ogo 2 m A TLTDLDU 89TH Lota 99TH 120 M 620 ril NOLON 1459 OOLPMOT T S9TH 70 220 TZO LOTH B LOWHNL LIOI 9 et 40215 0215 20215 020 T 6 ZZMOT T e LTO STORT lt KLOPL 8 5 tor PNOS TT LIOI lt 5 KLOPL ENOS 0 8 6 TOZIS MS dW3 MS LXH 5 STO EETU 4 44 LNO S 5 4 221 49 INDS wor LISI el 0825 WLOPL Z T KWOH YEN TTO dS LAH UL LAH WOH SNT WOH 9HO LOO 900 500
11. Oct 1995 TOSHIBA 1550 DRIVE 7 OPTICAL SYSTEM 7 1 Construction The optical system consists mainly of the original glass carriage 1 carriage 2 lens unit mirror unit and drive motors 2 3 2 5 2 1 9 DO 3 3 2 53 9 Original glass 2 Carriage 1 21 Exposure lamp 2 2 Reflector 2 3 1 9 Carriage 2 3 1 Mirror 2 3 2 3 Lens unit Mirror unit 6 1 Mirror 4 5 2 Mirror 5 6 Mirror 6 7 Slit glass Oct 1995 TOSHIBA P 1550 OPTIGAL 2 FAN 255 NN o o 5 RS 8 5 s an 5 UL co Ir Scanning motor 8 1 Carriage drive wire 9 Mirror motor Lens motor Lens drive belt 1 pc Feed side Front side Rear side Exit side 09 Auto exposure PC board 1550 OPTICAL 7 2 Oct 1995 TOSHIBA 7 2 of Operation 7 2 1 Scanning motor The rotation of the scanning motor located on the rear is transmitted to carriage 1 and 2 Scanning motor Timing belt Pulley Teeth 15 gt Pulley Teeth 66 Timing belt 2M 112 Pulley Teeth 18 gt Pulley Teeth 27 2M 77 Carriage drive wire Shaft F
12. P5 118 Page item No Symbol Code name ATS SNR ATC Auto toner sensor THMS THMS HTR Heat roller thermistor Reads toner density with magnetic sensor Detects temperature of the heat roller 18 126 20 19 HERMO Thermostat Prevents abnormal heating of heat roller P20 18 FU EXPO Thermofuse TMS DRM TMS DRM Drum thermistor Oct 1995 O TOSHIBA Prevents abnormal heating of the exposure lamp Detects the drum tempera ture roughly P10 15 P3 139 1550 GENERAL 2 3 Wire Harness Location Diagram A Location Diagram for Upper Unit 2914 VMd 5 J4 J9 J11 5 N sna nsv J 00v sd oo 820 Lost 84 204 S SWHLWNYG oer HLN SNT EN LN HSNS SEC HOQ NSV g SHI NSV SL 27108 8 104 1 ROW o MS s S 68 gp sv INd 3 VMd S 5 8 OdX3 n4 5 5 dINV T OdX3 2 86 23 458 One st M8 3NOH en E eq 140 1 8 NV4 LIX3 HlO l Oct 1995
13. Oct 1995 TOSHIBA 10 Pull out the three connectors for the charger and the bias wire from the high volt age transformer 11 Disconnect the connector for the process unit Oct 1995 O TOSHIBA 6 7 1550 DRIVE 12 Remove the drive unit from the rear inside of the machine 3 screws Close the clamshell and remove 2 screws from each of the 2 screw holes on the rear frame 13 Removing two screws take out the bracket and the gear can be replaced Drive unit go t 24 1550 DRIVE Oct 1995 O TOSHIBA 6 3 3 Lower drive unit Remove the fuser unit 1 2 Remove the transfer separation charger 3 Remove the transport guide 4 Remove the connector cover of the feeder unit 5 Remove the feeder unit 1 screw and connec tor 6 Remove the lower drive unit bracket 1 screw and separate the drive unit from the bracket 2 screws Oct 1995 O TOSHIBA 6 Screws fastening Lower drive unit the bracket 1550 DRIVE 6 4 6 4 1 Control signal Main Motor Main motor drive LGC FG pulse Phase V Difference Phase comparison Voltage detection circuit Reference frequency Excitation
14. Paper Weight 64 80 g m 17 22 lbs Dimensions W 548 x D 506 x H 130 mm W 21 6 x D 19 9 x H 5 1 Weight 8 kg 18 5 Power Source Factory Set Size Supplied from the copier A3 for Europe User adjustable Ledger for USA Canada Serviceman adjustable Note Specifications are subject to change without notice Oct 1995 TOSHIBA MY 1004 13 1 1550 OPTIONAL 13 2 General Description 13 21 Front sectional view Refer to P2 1 13 2 2 Rear side view Refer to P2 2 13 2 3 Names of the main components Positioning pins Empty switch Positioning pin Paper feeding unit Separation roller Drive PC board Interface harness Positioning pin PFU drive motor Rear side View with the rear cover and cassette removed Paper guide Transport roller right Transport roller clutch 222559 TT ATT A Jam access cover 1550 OPTIONAL 13 2 Oct 1995 O TOSHIBA 13 2 4 Electrical parts location diagram Front side Transport roller clutch RGT2 CLT PFU pick up roller clutch PKUP2 CLT Cassette size switch SIZE2 SW Drive PC board Paper stop switch PSTP2 SW PFU drive motor PFU MOT Empty switch EMP2 SW Door switch PFU feed roller clutch DOOR2 sw FED2 CLT 13 2 5 Symbols and functions of electrical parts Refer to SERVICE PARTS LIST MY 1004 Name
15. Pulse waveform shaping circuit Exposure lamp Waveform Operational shaping circuit amplifier 1550 OPTICAL 7 22 Oct 1995 O TOSHIBA 8 FEEDER UNIT 8 1 Construction The paper feeder unit consists of upper and lower paper feeder units G Gear G20 G 0 NY ex Aligning roller upper G30 Aligning roller lower Rear side G40 Aligning roller clutch Upper paper feeder unit G Gear Feed roller clutch G20 Pick up roller clutch Paper feed roller G20 G26 Pick up roller Lower paper feeder unit turned upside down July 1996 O TOSHIBA 8 16 1550 FEEDER 8 2 Explanation of Operation 8 2 1 Paper feeding operation View as seen from the front D Aligning roller upper 2 Aligning roller lower Aligning switch 4 Pick up roller Paper feed roller 6 Separation roller Paper empty switch View as seen from the rear Aligning roller clutch 3 Pick up roller clutch Feed roller clutch Main motor 1550 FEEDER 8 2 Oct 1995 TOSHIBA Manual feeding operation e Paper manually inserted pushes the aligning switch e When the PRINT key is pressed the main motor starts rotating and the aligning roller clutch is energized causing the paper to be sent to the transfer process B Cassette feeding operation Electromagnetic clutches feed roller clutch and pick up roller clutch are
16. To interrupt the charge LED P15 115 D HTR U Damp heater U Keeps optical system warm option PTC P12 133 D HTR L Damp heater L 1550 GENERAL Keeps the drum and transfer separationcharger case warm option P6 136 Oct 1995 O TOSHIBA 6 boards Code name Function Go to DC Harness Remarks Connection Diagram Page item No PWA F LGG Logic PC board Controls the entire copier P5 114 5 Power supply PC board Supplies electrical power to ICs solenoids and motors P5 119 PWA F PNL Control panel PC board Controls condition displays and operation keys P2 122 PS LRG Lamp regulator PC board ASM DCH LED eraser array PC board Controls exposure lamp Turns on and drives LED during reduction P4 135 P15 115 ASM ERS Discharge lamp PC board Discharge lamp P15 114 PWA F AES Reads dark light of the original P8 128 PWA F FUS Fuse PC board 7 Transformers Code name Fuse for the damp heater circuit Function Remarks P5 123 Page item No 7 Symbol HVT PS HVT Charging transformer Transfer separation transformer 8 Others Generates high voltage electricity for charging negative voltage Generates high voltage electricity for transfer separation and developing bias voltage Function Remarks
17. Variable output 3 Exposure 1 Light control Automatic exposure manual step setting 2 Light source 300W halogen lamp stabilized with regulator light intensity remains constant even when voltage varies 4 Development 1 Magnetic roller 2 Auto toner One magnetic roller with two shaft mixers Magnetic bridge circuit system 3 Toner replenishment Toner cartridge system 4 Toner empty sensor Intensity sensing system 5 Toner T 1550 or T 1550E 6 Developing material D 1550 7 Developer bias DC 200V 5 Transfer Adjustable output fixed current 6 Separation Adjustable output independently adjustable 7 Discharge 1 Discharging position After cleaning 2 Discharge lamp LED type 8 Cleaning 1 System Blade system 2 Recovery of toner 1550 PROCESS Non reusable 3 2 Oct 1995 O TOSHIBA Process 9 Fixing 1 Type Fixing Heat roller system Fixing roller Teflon coated roller Pressure Pressure roller PFA tube silicon roller 928 Lamp rating 900W infrared heat 2 Cleaning Cleaning with silicon impregnated roller 3 Heater temperature control ON OFF control by thermistor 10 Control Oct 1995 TOSHIBA Microcomputer 1550 PROCESS 4 COPIER OPERATION 4 1 Operation Outline Copier operation Operation dur
18. e 24VD Power supply for the optional 2 AC outputs For driving the heater lamp For driving the lamp regulator 3 Other control signals e Zero cross output Zero cross interrupting signals e OFF signal Reset signals Oct 1995 TOSHIBA 15 1 1550 POWER 15 2 Explanation of Circuit Operation 1 DC 24V The 24V system which is rated voltage based on the switching method is always controlled to provide fixed output voltage by feeding back fluctuation in the output to the primary side through photocoupler 2 DC 5V The 5V system is for providing a regulated 5V output by stabilizing the voltage from the winding by means of a 3 terminal regulator The following shows the output sequence of the power supply ON PENE 500ms or less 8 ave er elr 4 75 5V zl J N 21 6 or more EN 0 5ms or less ACOFF 21 6V or more 20ms or more 1550 POWER Oct 1995 O TOSHIBA 16 BOARD ASSEMBLY 16 1 PWA F LGC 1610 jas EE ie Ent ca 6 101 Ps E 4400671050 PWB F LGC 140 16 2 PWA F FUS F1 pue 15A 125V Ek 77 FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE ONLY WITH SAME TYPE m ses or FUSE 4400677270 PWB F FUS 140U fam uc 1
19. 1 10W180 SCN MOT C SCN MOT C SCN MOT A SCN MOT A 1 0 1 25 1 2 22 35 6712MK3 6712G 14 5 1550 CIRCUIT DIAGRAMS Logic Circuit PWA F LGC 6 8 1 188 EXP 2 1 10W820K R79 1 R62 1 10W1000 HINT How to search for where a signal in a circuit diagram has jumped to 4 5 R60 1 10W4700 1B8 1550 CIRCUIT DIAGRAMS 5VSWON R75 RTF 1 10W1000 c23 CC0 1 25 Je CC0 1 25 GND GND C5 22 16 11 4 7 16 2 12 76 GND GND 1 10W4700 22 2200 50 MC74 VDD 1 GND2 0 1 25 8 GNDO 20 14538 RN1401 1 4700 D5 155193 MC74 2 HC 3 I sere IC16 R77 1 R94 1 10W4700 Hel dr R93 jpl 10W22K a 3 7 gt 04 C19 2 1 10W4700 R91 1 5 HC 6 WU ED 21 10W1800 R92 1 21 10W4700 D7 5 166181 431 c2 4 7 16 67 1 10W4700 3 R61 1 4700 yW 2 z 1 04 4700 3 RN2401 05 En 1 10W1000 R59 1 10W330 R39 1 10W4700 DSP RST 1 C28 T 2200 50 GND 14 6 July 1996 TOSHIBA Logic Circuit PWA F LGC 7 8 Oct 1995 O TOSHIBA PROCESS VDD 24V 175132 24 1 2RXE185 TNR MOT TNR FULL C64 0 1 5 0 DEV SW ATS VREF ATS VIN DRM THM LED CN ON LED SCK 24V VDD AQ 53
20. 13 4 5 Drive motor and drive PC board 1 Remove the rear cover Drive PC board 1 After disconnecting six connectors remove the PC board from its four lock supports Drive motor 1 Disconnect one connector from the drive PC board 2 Remove four screws and take out the motor assembly 3 Remove the bracket 2 screws 4 Remove three screws Note When installing the motor assembly to the rear frame take the following precaution Tighten respective screws so that the front Drive motor Drive PC board Bracket 2 edge of the damper should be down by 5 6 E mm from the frame surface 5 2 Overtightening can damage the damper 2 NI Screw Motor assembly Oct 1995 TOSHIBA 13 13 1550 OPTIONAL 13 4 6 Empty switch 1 Pull out the cassettes from both the copier and the paper feeding unit 2 Remove one screw and take out the switch along with the cover 3 Detach the switch from the cover 1550 OPTIONAL 13 14 Switch cover Empty switch Oct 1995 O TOSHIBA 13 5 Flow Charts and Timing Charts 13 51 Flow chart YES Checking mode Is the cover open Motor and all clutches OFF Is the cover closed Paper stop YES Have 0 and 9 Cen been pressed gt simultaneously YES switch ON Papers in th
21. 1550 OPTICAL 7 16 Oct 1995 TOSHIBA Shown below is the waveform timing chart of each section discharge voltage S NN Volreg loFF ION 2 O1 VDS Equivalent circuit of STK6712B 1 oA A Tdi Vref NC Vref Td2 PG PG 1 2 3 15 13 8 2 12 11 18 14 16 7 5 4 5 Drive voltage regulator 1 2 4 Go 9 2 C1 2 2 5 I 1 7 R8 LAM LAN R5 R6 IC2 2 lt 1 CC IC1 i R11 R10 IC1 D1 R127 02 1995 7 17 1550 OPTIGAL 7 4 2 Pulse motor dirve constant voltage type 4 Lens motor M3 LMS MTR Driven by 1 5 Logic PC board TD62308F Mirror motor M4 MRR MTR Driven by IC4 Logic PC board TD62308F Phase 24 Phase The diagram on the right shows signals impressed to QA QB QA and QB bases in two phase exci A tation on ON The ON OFF combination of the transist
22. 8 60 t0 0 e QN PUAFPFU z S o 2 20 ro 1 5 eke s 68 8 285620002006 Eg 2 SER E 8 im 3 91 55 I e 81 2 5 S S e ar S I Lg m m 9 8 amp 5 B MY 1004 PWA F PNL 17 2 Oct 1995 TOSHIBA 18 UNPACKING PROCEDURE 18 1 Unpacking and Set up Procedure for the 1550 A 1 Oct 1995 TOSHIBA 18 Unpacking Procedure Open the carton and take out the accessory package and other packing materials The ac cessory package includes the following parts Copy receiving tray Set up report U S A Canada Europe Operators manual Fuser unit lever caps 2 pcs e Set up instruction Open the plastic bag and holding the lifting bands take out the machine from the carton Remove all packing materials from the outside and inside of the machine Pull out the cassette and take out the packing material located at the front side Remove the screw fastening the carriage Note For the screw fastening the carriage a coin screw is used So after loosening it with a suitable coin the screw can be removed by manually
23. D Q2 Cleaning blade Remove two screws to take out the roller 12 3 5 Upper heat roller 1 Take out the heater lamp 2 Remove the holder unit 2 screws 3 Remove the stop ring and bushing on the front and then pull out the roller along with its gear toward the rear Note While replacing the roller be careful not to damage the roller surface with metal plate edges or be careful not to deform or dam age the separation claws 12 3 6 Lower heat roller 1 Remove the upper heat roller 2 Remove the separation claw unit 1 screw Oct 1995 TOSHIBA 12 Cleaning felt roller Cleaning blade Holder unit Gear 00000 0000 Stop ring and Upper heat roller bushing 1550 FUSER 3 Remove the paper guide 2 screws 4 Placing your finger tip on each side of the roller take out the roller along with the bearings up Lower heat roller Bearing s groove ward Note After setting the lower heat roller in the ma chine check to make sure that the pressure levers are fitted in the bearing grooves at the front and rear 12 3 7 Lower exit roller and paper exit switch 1 Take out the fuser unit 2 Slide the exit roller unit to the front and then take it out toward you 00 02 1550 FUSER Paper guide Pressure lever Exit roller unit 12 6 Oct 199
24. Door switch 1 Disconnect its connector unhook its claws and the switch can be taken out Transport rollers right left and paper stop switch Transport roller clutch Setscrew Connector Door switch Harness 1 Remove the transport roller clutch 2 Remove the transport paper guide 3 screws Oct 1995 O TOSHIBA 13 Transport roller right Transport paper guide 9 1550 OPTIONAL 3 While bending the transport guide the direc tion of the arrow remove the bushings from the Transport roller right frame ue both front and rear and the transport roller right can be taken out along with the bush ings Bushings Transport paper guide 4 Take out the bushings and the transport roller left Paper stop switch 5b Take out the paper stop switch along with the guide Notes 1 During reassembly fit the switch har ness into the groove securely 2 Whenreassembling the switch pay at tention to its orientation Harness Transport roller left 3 When reinstalling the transport paper guide make sure that the plate spring Plate spring is in contact with the shaft of the trans port roller right securely 1550 OPTIONAL 18 10 Oct 1995 TOSHIBA 13 4 3 Separation pick up and feed rollers 1 Remove the cassette Qut 2 7 Ex OE
25. drum where the light from the exposure lamp does not fall are exposed b Exposes the portion which is out of the paper size and unnecessary charged ac cording to the cassette size signal Non image section The LEDs are turned on and the drum surface Drum is irradiated gt the charge in the area hit by the Non image section light disappears from the drum surface gt the image of the section where the light has fallen is therefore erased Operation description The LED eraser array consists of 32 LEDs and the LEDs in the same position in the front rear direction based on the image center are connected to the same bit in parallel Data according to input coordinate for paper size reproduction rate from the logic PC board are fed to LED eraser array by 64 bits effective data are the last 16 bits Data 1 LED ON Data 0 OFF the level on the input pins of IC L7932 of the driver controller Ex When one LED is turned ON at both ends of LED array is fed from logic PC board to the 64th last datum 16th effective datum and 0 to data 1 63 effective data 1 15 1 is set in shift register equivalent to ED1 and ED32 and 0 is set for the others After setting is completed it is transferred to latch According to the driver turn ON LED on both ends accordance with data A timing chart for the above is shown below Oct 1995 O TOSHIBA 9 11 1550 DRUM
26. 1 1 ZNOLOK 1 1 z12anxa LOWHNI 2 15 1 SNOS 7NDS ENOS 2425 1N2S m onos How to search for where a signal in a HINT dS LAH 85 LAH uL LAH I W LAH NoLxa 1 F LGC 2 8 1 it PWA Logic OOLPMOT TT T 9TH 5 O9I 6SI SPI NId UND OPI SEI ZZI NId OND PIT OT b8 NId UND 08 61 2946 Zv NId UND IP SE IZ 9T1 GI NId OND OST 0E T NId OTT 06 18 19 LY NIG Ov OZ OI I NId 09 18919959 212 05 4002222 675 TNVYSO INVHSO TodIso OOLPMOT Isua 7 115949 OZTA iso 7 1551 204150 HLTwa TROSA OOLPMOT 5 54 LVA dSA 5 wu 7 aa wig 7 TTY ant 9TTY 5 NOS 001 125 5 5 NO HLO 21819 GET SIV VIV x BET ZTE eel 9TOI tiv STOT 5 5 MYELON TOI GE mm HIGLON NOLOW 8 000 gv vv MS IDU 2159 TMS ANH 2
27. 1 2 3 3 2 Scanning motor and timing belt Remove the top cover Disconnect one connector Afterremoving three screws you can take out the whole unit At this time the timing belt 2M 77 is also removed Note 1 When reassembling the parts make sure that the timing belt is securely placed on the pulleys P66 P18 and the shaft drive pulley P22 2 The scanning motor is screwed on in the position of the hole A at the time of ship ping from the factory When the belt tension adjustment is nec essary reinstall the screw at the elongated hole B not the hole A After having pushed the scanning motor in the direction of the arrow install it 4 After taking out the unit remove two screws and the motor is removed Note When reassembling the parts make sure that the timing belt is securely placed on the pul leys P66 P18 and the shaft drive pulley P22 3 Mirror motor 3 Remove the original glass Remove the optics cover 1 screw After removing two screws take out the bracket Remove two screws and disconnect one con nector from the bracket and the mirror motor is removed Oct 1995 O TOSHIBA Te Elongated hole B Hole A Scanning motor 917 7 Rl p 23 aah lid gt Mirror motor Bracket 1550 OPTICAL 7 3 4 Lens motor 1 Remove the m
28. 2 Shake the new toner cartridge to the right and to the left 5 or 6 times to loosen the toner in side 3 Pullto remove the seal from the new toner car tridge Do not shake the toner cartridge after re moving the seal The toner may spill 4 Install the new toner cartridge in the machine Push the toner cartridge fully in until it is locked securely 5 Close the front cover Oct 1995 TOSHIBA 18 11 1550 UNPACKING PROCEDURE 18 2 Unpacking and Set up Procedure for the Paper Feeding Unit 1004 A Unpacking Procedure 1 Open the carton and take out the package and the paper guide 09 1 2 Remove packing materials and take out the paper feeding unit MY 1004 ae 3 Remove packing material The following parts are included in the pack age Tapping screws M4 x 8 pcs Screws M4 6 5 9 Beet Separation roller pressure 888 spring 1 pC 09 Fixing plates 4 9 Reference 229 i The applicable model is the ED 1550 1550 UNPACKING PROCEDURE 18 12 Oct 1995 TOSHIBA Installation 1 Docking the 1004 with the copier 1 Place the MY 1004 on the copier stand 2 Using two people lift the copier and place it slowly onto the MY 1004 so that the copi er s cassette
29. 4 5 6 7 8 9 10 sec Aligning switch RGT SW copier Aligning roller clutch 5 6 RGT1 CLT copier 3 56 Paper stop switch PSTP2 SW Transport roller clutch RGT2 CLT Feed roller clutch FED2 CLT Pick up roller clutch PKUP2 CLT 2 74 3 31 3 93 Drive motor PFU MOT A4 lateral two sheets copying PFU 11 Sec 0 1 2 3 4 5 6 7 8 9 10 RGT SW copier RGT1 CLT copier PSTP2 SW RGT2 CLT FED2 CLT PKUP2 CLT PFU MOT Oct 1995 O TOSHIBA 3 56 4 34 7 48 2 74 3 31 6 24 7 23 7 86 0 99 3 5 4 49 3 5 3 75 0 99 3 5 4 49 13 19 1550 OPTIONAL 13 6 Explanation of Circuits 13 6 1 Interface signals A Signals from the copier to the paper feeding unit PFU 1 19 9 RGT CLT2 Drives the transport roller clutch When the signal is L the clutch RGT2 CLT energizes PKUP CLT2 Drives the pick up clutch When the signal is L the pick up roller clutch PKUP2 CLT energizes FED CLT2 Drives the paper feed roller When the signal is L the clutch FED2 CLT energizes causing the paper feed roller to start rotat ing MOT ON2 Rotates the drive motor When the signal is L the drive motor PFU MOT starts rotating B Signals from the paper feeding unit PFU to
30. 8 660 02050 Key copy counter kit MU 10 660 02051 Counter bracket kit KN 1550K 660 84840 Cassette 1550 660 84841 KC 1550LF 660 84842 KC 1550AFE 660 84914 For Europe Damp heater kit MF 1550U 660 84848 MF 1550E 660 84849 Paper feed unit MY 1004L 660 84835 MY 1004AE 660 84913 For Europe MY 1004A 660 84836 Sorter bracket kit 15505 660 84839 for MG 1003 Supplies Developer material PS ZD1550 66084853 Toner PS ZT1550 66084851 Toner for Europe PS ZT1550E 66084852 Toner bag PS TB1550 66084859 Toner bag for Europe PS TB1550E 66084860 1550 SPECIFICATIONS 1 4 Oct 1995 TOSHIBA 2 2 1 Sectional Views and Electrical Parts Location Diagram 2 1 1 Front and rear sectional views BG amp 69 69 9 ABS 9 6 D 63 8 Carriage 1 Magnetic roller 1 Leveler doctor PETER BERI Reflector Auto toner sensor EY mes Nr Exposure lamp Mixer N o Exposure adjustment plates Bypass feed guide 1 INE Aq 1 J ES AS B f d Carriage 2 ypass feed tray QQ S E 1 a Mirror 2 Aligning roller upper Mirror 3 Aligning roller lower Mirror unit Aligning switch Mirror 4 Transport roller left MY 1004 Mirror 5 Transport roller right MY 1004
31. F ON How to search for where a signal in a R82 1 10Ww4700 R83 1 1 10W10K 3 R163 27041000 R162 1 108 4700 TL pe 188193 N TL p13 15193 N ATS VIN R115 REE 1 10W10K RTP 1 10W15K R113 1 2 1 10W10K c53 2 1 96 981 313 MRR24V MRR24V 2 TNR MOT TNR MOT 11 912 SC2873Y ATSVIN ATSVIN Cc0 1 50 ATS VREF 14 4 Oct 1995 TOSHIBA Logic Circuit PWA F LGC 5 8 Oct 1995 TOSHIBA R4 1 10W22K R6 1 10W4700 R5 1 10W6800 HINT How to search for where a signal in a circuit diagram has jumped to R23 1 10W560K 1 2 R21 1 10W22K R22 1 10w1000 24VCHK 24VCHK c7 CC0 1 25 GND 1p 12 1 10W4700 1 10W10K R25 1 R24 1 10W22K THM VREF 2 THM VREF TH TH HTR ON ScN n SCN H R28 1 10 3900 R27 1 10W4700 RTP 1 10w1000 88 1 10W3300 R29 1 10W3900 CC2200P 50 8 R31 iere P 1 10W4700 155181 SCN 1 SCN L SCN D SCN B 4 SCN B R35 RTF 1 10W4700 HTR RDY C12 0 1 25 C11 cco 1 25 GND SSR 1 10W4700 RTP 2 1 10W4700 R11 155554 1 10W4700 1 1081500 2 171094700 SCN MOT D SCN MOT D SCN MOT B SCN MOT B ScN c 4 SCN C SCN A 0 1 25 R10 1 10W2700
32. MM 2 Remove the paper guide D LL PAD X Separation roller 1 It can be taken out if you pull it toward you Separation roller Spring Pick up and feed rollers ick Feed roll 1 Snap off the clips and slide out the pick up roller ja from its shaft The feed roller can be removed by the same procedure Clip Note The separation pick up and feed rollers are the same parts as used in the copier Caution During disassembly or reassembly be careful not to lose the spring Oct 1995 O TOSHIBA 13 11 1550 OPTIONAL 13 4 4 Lower paper feeding unit 1 Remove the copier s cassette and the paper feeding unit s cassette 2 Remove the roller cover on the copier side of the paper feeding unit 3 Remove one screw from the lower paper feed ing unit 4 Remove the feed roller b Remove the rear cover 6 Remove one screw and then take out the whole unit toward the front Note Since the disassembly and replacement pro cedures for the pick up roller clutch feed roller clutch and pick up roller are the same as for those of the copier refer to para 8 3 2 1550 OPTIONAL 13 Lower paper feeding unit copier 9 PI Gan Orr UP FL Si I Bm r Roller cover a OT xL Cm The screw being removed Oct 1995 TOSHIBA
33. MTR ON signal becomes L level the main motor stops DRIVE Oct 1995 TOSHIBA 6 4 2 Control signal 1 MAIN CW CCW LGC gt Input This is a signal to change the direction of rotation of the main motor When the CW CCW signal is at L level the main motor rotates counterclockwise when viewed from the rear and drives the devel oper drum and heat roller in the designated direction 2 PLL OK signal gt LGC Output When the FG pulse cycle difference against the reference frequency is within the range of 4 6 and 5 3 it is defined as the lock range normal state and the signal becomes L and LED ED1 comes ON 3 MTR BRK signal LGC gt Input This is the signal to control the speed of the main motor The brake is applied to the main motor when the signal becomes L level 4 MAINMTR ON signal LGC MTR Input This is a signal to turn ON OFF the main motor The main motor turns when this signal becomes level 5 MOT FG signal This signal generates FG signals while the motor is rotating Signal level of motor circuit Signal name level L level MAIN CW CCW CW direction CCW direction PLL OK Control deficiency Normal MOT FG Rotation pulse signal MTR BRK Brake OFF Brake ON MAINMTR ON Motor ON Motro OFF The signals are respectively the level on the input output pins of and 3
34. TOSHIBA 1550 GENERAL Location Diagram for Lower Unit AC 29T4 VMd H3MOd LNdNI OV LINN H3ddf OL LINN YAddN OL PWA F FUS MS NIvn 9 54 3din9 H34dSNVHl 3Hd YJDYUVHOI YIYSNVEYL B2HB1 H39uVvHO NOILVHVd3S ONYHIHLM 5 5 ees 1 8 NI LOL 4 N ar gt wo Gr 4 608 8028 er MS HOOG 8 2 10 1550 GENERAL Oct 1995 TOSHIBA 2 4 Removing Covers and Electrical Parts 2 4 1 Removing covers A Front cover 1 Remove the cassette in the direction of the arrow 2 Remove the screws fastening the hinge 4 pcs B Inner cover upper 1 Open the front cover 2 Remove the toner cartridge 3 Remove three screws 1550 GENERAL 2 Front cover Cassette Inner cover upper 11 Oct 1995 O TOSHIBA C Inner cover lower left 1 Remove one screw D Right side covers upper and lower and feed si
35. TOSHIBA C Adjustment Procedure 1 Automatic adjustment of the auto toner sen sor 1 When the power switch is turned on the auto toner sensor is automatically adjusted by the following procedure 2 UA is shown on the copy quantity display and the PRINT key lights in red And the automatic adjustment of the auto toner sensor starts 3 The machine starts its operation The out put value of the toner sensor is shown on the display and changes quickly 4 About 2 minutes and 30 seconds later the value on the display stabilizes at 23 25 5 About 30 seconds later the automatic ad justment of the auto toner sensor is com plete and UA is shown on the copy quan tity display Also the ADD TONER 21 is displayed 3 6 Open the front cover and install the toner cartridge 7 Close the front cover If the adjustment has finished abnor mally the machine stops its operation and displays the CALL SERVICE Then for the subsequent ad justment of the auto toner sensor fol low the procedure described in the Service Manual Oct 1995 O TOSHIBA 18 o pp CLEAR STOP PRINT Power ON p n Ei During automatic adjustment Normal Abnormal nt Lit LI 1 N VI oe 21112 Flashing Eu Flashing Warm up start 1550 UNPACKING PROCEDURE Final Operation C
36. be sure to turn the main switch off and unplug the power cord during service Be sure not to touch high temperature sections such as the exposure lamp the fuser unit the damp heater and their periphery Be sure not to touch high voltages sections such as the chargers and the high voltage trans former Be sure not to touch rotating operating sections such as gears belts pulleys etc When servicing the machines with the main switch turned on be sure not to touch live sections such as the lamp terminal etc Use suitable measuring instruments and tools Main Service Parts for Safety The thermofuse thermistor fuse breaker and door switch etc are particularly important for safety Be sure to handle install them properly Notice Labels Be sure to check the rating plate and the notice labels such as Unplug the power cord during service Hot area etc to see if there is any dirt on their surface or if they are properly stuck to the copier during servicing Disposition of Consumable Parts Packing Materials Regarding the recovery and disposal of the copier consumable parts and packing materials it is recommended to follow the relevant local regulations or rules When parts are disassembled reassembly is basically the reverse of disassembly unless otherwise noted in this manual or other related documents Be careful not to reassemble small parts such as screws washers pins E rings toothed washers in the wrong places
37. copy counter option has been inserted in the machine and is withdrawn Insert Key Counter is displayed Copying can not be started e the key counter is withdrawn during copying the machine will stop after the paper being copied has exited Oct 1995 TOSHIBA 4 7 1550 OPERATION 1 2 Clear paper 8 The leading edge jam is detected by the exit switch S6 E01 The aligning roller clutch CLT1 is turned ON 2 0 sec exit switch 56 comes CLT1 o When S6 has not come ON after 2 5 ON seconds have elapsed 56 Timer The Clear Paper E01 symbol ap 0 2 5 copying will stop The trailing edge jam is detected by the Clear paper 01 exit switch S6 E02 Aligning roller clutch CLT1 is turned OFF 2 0 56 OFF detects paper 56 When 56 has not come OFF after 2 5 ON seconds have elapsed i Timer The Clear Paper symbol E02 ap pears and copying stops Clear paper 2 Immediately after the power is turned ON 4 The aligning switch S5 and exit switch S6 detect the paper ON 4 Clear Paper symbol E03 The front cover is opened during copying 4 Clear Paper symbol no indication Add toner 121 Toner density has become low 4 Toner empty signal detection Auto toner sensor i Control circuit Toner symbol appears Copying is not possible
38. correct the inclination of the straight im age retighten the screw at the elongated hole B 12 3 2 Heater lamp 1 Remove the fuser unit 2 Remove the fuser guard 1 screw 3 Remove the screw fastening the terminal on the rear 4 Remove the lamp holder bracket R 1 screw Oct 1995 TOSHIBA 12 Fuser unit Elongated hole B 14 Hole Front side Fuser guard Heater lamp Lamp holder bracket R 1550 FUSER 5 Disconnect connector and remove one screw to take out the lamp holder F Notes 1 When replacing the lamp don t touch it with a bare hand 2 Be careful so that the Toshiba mark is on the front side 12 33 Thermostat thermistor and brush 1 Remove the fuser unit 2 Remove the fuser guard 8 Remove the rear screw of the thermostat 4 4 Remove the holder unit 2 screws Thermostat Remove one screw to take it out Thermistor Remove one screw to take it out Brush Remove one screw to take it out 1550 FUSER Lamp holder F Thermostat Thermistor P Holder unit Brush Thermistor Thermostat 12 4 Oct 1995 TOSHIBA 12 3 4 Cleaning felt roller cleaning blade 1 Remove the fuser unit 2 Remove the fuser guard Cleaning felt roller e Lifting the front side take out the whole roller unit upward
39. es R25 t t 3 2241827 1528 1929 T R33 lon SGE C32 Ved R31 8 4 6 5 nett 24 04 Zerocross mls 27 PH R32 R72 R35 Mi R36 R16 ZN PIS 4 1 O3 SSR p 53 R43 PG R30 5 R73 2 7 1 3 Ry R26 C26 AM i i m SSR KE C11 012 Ra7 17 Y 15 2 5 01 Q6 a V ADJ R48 R50 R R63 1223 R19 D14 58 1 D2 C15 R38 R49 R70 969 99 id S A R40 4 4 4 8 e 8 8 a s 8 Ab r M4 4 TR45 pia Ra7 2241 1 R59 016 R44 E le 4 y 011 K AED 4 R46 017 Lon Heat Lamp 4 Q2 Lc C29 R51 MI QUE a 16 Oct 1995 TOSHIBA 14 9 1550 CIRCUIT DIAGRAMS 14 3 Control Panel Circuit PWA F PNL 1 4 1550 CIRCUIT DIAGRAMS DSP ONO DSP ON1 DSP DAT DSP LTH DSP RST DSP SCK DSP ONO DSP ON1 DSP DAT DSP LTH DSP RST DSP SCK 0 CKM33P CKM33P 50 so CKM33P R3 220 Q2 25 1428 R2 ip 2299 as 9 1428 CKM0 1 12 How to search for where a signal in a circuit diagram has jumped to N o LP36 1 SPR39MVWF LP42 5836G DSP16N LTL16KG DS
40. exposure mode Impresses a constant lamp voltage corresponding to the setting by the UP DOWN keys on the exposure lamp Automatic exposure mode The quantity of light reflected by the surface of the original which varies according to its lightness and darkness is detected by the automatic exposure sensor circuit and the voltage impressed on the exposure lamp is varied accord ingly a high lamp voltage being impressed when the origi nal is dark and a low lamp voltage when it is light 2 Function of lamp regulator A typical characteristic curve is shown below By means of a phase angle control system it is controlled so that a lamp voltage corresponding to EXP PWM pulse duty ratio input is generated even when some fluctuation occurs in the AC input voltage Lamp voltage Limiter voltage 90V 184 92 V approx Range of actual use 92 46 40 V 90 V PWM pulse duty ratio e 100 V series 200 V series Range of actual use lt Characteristics of the of the lamp regulator 1550 OPTIGAL 7 20 Oct 1995 O TOSHIBA 3 Automatic exposure sensor PWA F AES 140 Through the action of IC1 the incidence of light upon protocell PD1 generates an AES signal on J3 6 Dim reflected light Small AES output Intense reflected light Large AES output 4 Arithmet
41. for where signal in circuit diagram has jumped to LNS MOT D LNS MOT C LNS MOT B LNS MOT A MRR MOT D MRR MOT B MRR MOT A PKUP CLT FED CLT RGT CLT LNS MOT D LNS MOT C LNS MOT B LNS MOT A MRR MOT D MRR MOT C MRR MOT B MRR MOT A K CTR T CTR PKUP CLT FED CLT RGT CLT PKUPCLT2 4 PKUPCLT2 FEDCLT2 FEDCLT2 PKUP CLT2 FED CLT2 PKUP CLT2 FED CLT2 RGTCLT2 RGTCLT2 RGT CLT2 RGT CLT2 MOTON2 4 2 MOT ON2 MOT ON2 MOTDIR 4 MOTDIR MOTBRK 67 0 1 25 MOTON ERSON CN ON HVT M HVT TR 4 HVT TR HVT GB HVT SP MOT DIR LED CN ON HVT M ON HVT TR ON HVT GB ON HVT SP ON MOT DIR MOT BRK MOT ON ERS ON LED CN ON HVT M ON HVT TR ON HVT GB ON HVT SP ON 1550 CIRCUIT DIAGRAMS Logic Circuit PWA F LGC 4 8 EXT H L EXTON OPT H L OPTON 1550 CIRCUIT DIAGRAMS R111 1 10W4700 1gp l2 1 10W10K RTP 155193 21 10W1000 R112 1 10W4700 R104 1 10W4700 RN1401 3 R103 1 21 10W10K 155193 012 R100 11 21 10 1000 R101 1 10W4700 HINT circuit diagram has jumped to MRR CHG 1 11 EXT FAN2 EXT FAN2 EXT F ON EXT F ON TNRMOT ATS VIN 4 OPT FAN R OPT FAN F ATSVREF OPT F ON OPT
42. guide holes not shown in the diagram are aligned with the MY 1004 s positioning pins Notes 1 When docking the MY 1004 with the copier aligning the front and right hand surfaces of the copier with those of the MY 1004 respectively will make the installation easier 2 Before the copier and the MY 1004 are fastened with screws 4 places do not move or carry them to another place 2 Removing the covers 1 Remove the rear cover of the MY 1004 2 Screws itt 2 Remove the rear cover of the copier 2 Screws 3 Remove the lower feed side cover of the copier 2 screws Oct 1995 TOSHIBA 18 13 1550 UNPACKING PROCEDURE 3 Fastening the 1004 and the copier 1 Remove the cassettes from the copier and the MY 1004 respectively 2 Using the fixing plate and screws 8 provided fasten the copier and the MY 1004 as shown in the Figure TR 4 Installing the wire harness 1 Fit the wire harness on the rear of the MY 1004 into the respective edge saddles of the copier and the MY 1004 and connect the harness to the J6 connector of the copi er s PC board 1550 UNPACKING PROCEDURE 18 14 Oct 1995 TOSHIBA
43. seconds after being turned ON Is heat roller temperature high enoug for fixing READY Service call C41 Oct 1995 O TOSHIBA 4 11 1550 OPERATION 4 4 2 Automatic feed copying Print key ON Process system control Main charger ON Transfer charger ON Separation charger ON Discharge lamp ON Transfer OFF Separation OFF Discharge lamp OFF Completed 1550 OPERATION Transport system control Is PLL checking on main motor ON e CLT1 e CLT1 OFF Remaining copying quantity 0 CLT1 OFF Service call C01 Optical system control Carriage moves towards home position EXP ON Carriage forward Carriage forward Carriage stops Carriage stops Remaining copy quantity 0 Carriage moves backward to its home position EXP OFF Carriage moves toward copiable size display position Complete Paper jammed 01 Oct 1995 TOSHIBA E02 Paper jammed Standby Oct 1995 TOSHIBA 4 13 1550 OPERATION 5 DISPLAY UNIT 5 1 Control Panel and Indication Panel The display unit consists of key switch which operates copying and to select the mode and an LED which displays machine condition and messages Signs and symbols are turned O
44. the MY 1004 operates normally 1550 UNPACKING PROCEDURE 18 16 Oct 1995 TOSHIBA
45. the position shown with an arrow Be careful not to allow gears and connec tors nearby to get stained with developer material Oct 1995 TOSHIBA 10 5 1550 DEVELOPER 10 3 4 Guide rollers Front side 1 Pour out the developer material from the de veloper unit Plate spring 2 Remove the leveler adjustment screw and the springs a coil spring and plate spring at the front Coil spring 3 Remove the front plate 2 screws Front plate 4 Replace the guide roller Note When reinstalling the front plate be careful not to allow the harness to be pinched Guide roller 1550 DEVELOPER 10 6 Oct 1995 TOSHIBA Rear side 1 Pour out the developer material refer to para Coil spring 10 3 3 2 Remove the leveler adjustment screw and the springs a coil spring and plate spring at the Plate spring rear 3 Remove the adjuster plate 1 screw Before removing it memorize its original posi tion Remove the rear plate 2 screws Adjuster plate 4 Replace the guide roller Notes 1 The guide roller is common for the front and rear sides 2 After reassembly the doctor to sleeve gap and the pole position should be adjusted Guide roller Oct 1995 O TOSHIBA 10 7 1550 DEVELOPER 10 3 5 Toner cartridge drive motor 1 Remove the process unit 2 Remove the process unit cover 2 claws 3 Take out the toner car
46. 00V series Oct 1995 TOSHIBA 4s Ee e z ERE 2 i e oe av 1 LI d EH 8H e Fi 16 34 250 as TOSHIBA C1 C P3 4400611280 PWB F FUS 140E y pO 200V series 16 1 1550 PC BOARD 16 3 PWA F PNL 16 4 5 PWB F AES 140 ws TOSHIBA 16 5 PWA F LRG CVR JUOLIIV 9 x E T KOG p 2 100 series 200V series 1550 PC BOARD 16 2 Oct 1995 O TOSHIBA 17 HARNESS CONNECTION DIAGRAM 17 1 AC Harness Connection Diagram PWA F FUS Thermostat e PTC Damp Heater L 2 E MAIN Switch Damp Heater U1 Door Switch x E 2 E Damp Heater U2 Switching Regulator Lamp Regulator THERMOSTAT AG Control Circuit Oct 1995 O TOSHIBA 17 1 1550 WIRE 17 2 DC Harness Connection Diagram 1550 WIRE Go to Symbol and Function of Electrical Parts Motors Electromagnetic spring clutches Counters s Heaters and lamps PC boards Transformers Others
47. 11 i 7 1 16 OUT1 5 Timing chart 1550 DRUM 9 12 Oct 1995 O TOSHIBA 9 6 High Voltage Transformer 5 Input connector Signal M VREF HVT M ON G VREF 24 DG Output 1 91NO Charge 0000000000 lt 500 pA JOJO9UUON 1ndu HVT TR ON Output 2 Grid 692 V TR VREF Output 3 Transfer 400 uA HVT GB ON Output 4 Separation AC 3 6 kV 1 2 3 4 5 6 7 8 9 HVT SP ON SP VREF Oct 1995 TOSHIBA 9 Output 5 Output 6 13 Developer bias Guide bias 200 V 1550 DRUM 10 DEVELOPER UNIT 10 1 Construction Top cover Guide roller Magnetic roller Auto toner sensor Mixer 2 Front sectional view Oct 1995 O TOSHIBA 10 1 1550 DEVELOPER 10 2 Drive System 10 2 1 Magnetic roller mixer 1 and mixer 2 Mixer 2 Mixer 1 Magnetic roller Rear side 10 2 2 Toner cartridge Developer unit front side Toner cartridge drive motor i Drive gear teeth 26 i Toner cartridge adding toner Toner is mixed by mixers 1 and 2 Toner cartridge drive gear G26 Toner cartridge drive motor 1550 DEVELOPER 10 2 Oct 1995 TOSHIBA 10 3 Disassembly and Replacement 10 3 1 Removal and installation o
48. 14 7407 5 31 R86 Ege 1 10W22K IC14 j 30 8 9 7407 29 26 625 5 1000 50 Z ulia gt 50 SE 20 12001001 74 19 R81 1 S REQ DFACK SACK 2 1 10W22K ias Bo icis 18 R66 jm 1 10W22K IC19 17 LEA S MOT FG DF REQ MRR D 6 R64 1 21 10W22K 15 RAS 1512 21 10822 14 RAG irr 1 10822k 37 7 8 C27 1000 50 8 c1 1000 50 8 al 1000 50 RB DIE 912 MRR C MRR B MRR A 11 10 9 LNS D LNS C LNS B LNS A SCN D SCN C SCN B SCN A AES VIN ON jw o o R125 gree 1 1084700 ATSVIN DRM THM TH R43 1 10W22K R127 1 21 10W22K R47 1 10W22K RST R30 1r 21 10W22K 272 2200 50 1 10W33K CC2200P 50 al I 012 21413 PI 02 25 1 signal in circuit diagram has jumped to P95 SCK1 P94 RXD1 P93 TXD1 P92 SCLKO p91 256 P90 TXDO P36 R W P35 BSAK P34 BSRQ P33 WAIT P32 HWR P31 WR P30 RD P87 INTO P86 TO6 P85 INT7 7 P84 INT6 P83 TO5 P82 T04 P81 INT5 P27 TIS P80 INT4 2 TI4 N gt AOILHVNOWORHUNOYN P73 TO3 P72 TO2 P71 TO1 P70 T10 NNNNN OIN on NN Shp dm P67 PG13 P66 PG12 P65 PG11 P64 PG10 P63 PG03 P62 PG02 61 01 60 00 A8 P53 AN3 P52 AN2 P51 AN1 P50 ANO VREF AGND P07 AD7 P06 AD6 P05
49. 1550 GENERAL 4 Switches Code name Function Go to DC Harness Connection Diagram Remarks Page item No MAIN SW Main switch Power supply Tumbler type P4 12 DOOR SW Door switch For safety cancels abnormal condition Push switch P4 4 EMP1 SW Paper empty switch 1 Detects lack of paper in the cassette Reflecting photo Sensor 120 SIZE1 SW Size switch Detects cassette size Push switch P6 126 RGT SW Aligning switch Detects paper in front of the aligning roller Photointerruptor 7 115 EXIT SW Exit switch Detects exiting paper Photointerruptor P20 115 HOME SW Home switch Detects home position of the optical system Photointerruptor P12 116 LNS SW Lens switch MRR SW Mirror switch Detects home position of the lens unit Detects home position of the mirror unit Photointerruptor Photointerruptor P12 116 P8 127 T FUL SW Toner full switch 5 Heaters and lamps Code name Detects when the used toner bag is full Function Microswitch Remarks P17 122 Page item No EXPO LAMP Exposure lamp Exposes the original Halogen lamp 300W P10 114 HTR LAMP Heater lamp Fixing Halogen lamp 900W 19 16 ERS LAMP Discharge lamp Discharges the drum LED type P15 114 DCH LED LED eraser array
50. 3 4 Disassembly Replacement 13 4 1 Covers and paper guide A Jam access cover 1 Open the jam access cover 2 Loosen the screw and take out the cover B Rear cover 1 Remove two screws to take out the cover C Paper guide 1 Remove the jam access cover 2 Remove four screws Oct 1995 O TOSHIBA 13 gt VIT TY HI T Uu em 2 lo o Jam access cover Rear cover Paper guide LL ee V AEEEEEISCEIEEEERZETEIE en Li f lb Mitt 1550 OPTIONAL 3 Disconnect connector to take out the guide D Front cover 1 Remove the cassettes of both the copier and the paper feeding unit 2 Unhook the right and left claws of the front cover 1550 OPTIONAL 13 Front cover Claw View with copier taken off Oct 1995 TOSHIBA 13 4 2 Transport rollers right left paper stop switch transport roller clutch and door switch 1 Remove the paper guide Transport roller clutch 1 Disconnect one connector 2 Loosen one setscrew Notes 1 When reassembling the clutch fit the clutch s projection into the groove shown securely and fasten the set SCrew 2 The clutch harness should be passed under the clutch as shown
51. 324 12 1 0 262 3 4 1 DUMMY 2 E2 6 7 8 2 LED DAT LED LTH 0 1 25 ERS ON I 10 11 12 lt 175487 7 TNR MOT TNR FULL DEV SW ATS VREF ATS VIN DRM THM LED CN ON LED SCK LED DAT LED LTH ERS ON 6712G 2 SSR ACOFF EXT SW SSR TH TH CNTROL PANEL FED RGT UNIT HINT How to search for where signal in circuit diagram has jumped to 53313 30 CTR SIG CTR CNT T CTR GND DSP DAT N N DSP SCK DSP LTH DSP RST 5 5 1 SCNO SCN1 5 2 SCN3 SCN4 5 5 K RTNO lt K RTN1 K RTN2 K RTN3 4 5 K RTN6 K RIN7 M 17513222V RGT CLT FED CLT PKUP CLT EMP SW N CTR SIG CTR CNT T CTR DSP DAT DSP SCK DSP LTH DSP RST DSP ONO DSP ON1 SCNO SCN1 SCN2 SCN3 SCN4 SCN5 K RTNO K RTN1 K RTN2 K RTN3 K RTN4 K RTN5 K RTN6 K RTN7 1205 812031 51202 151201 RGT CLT RGT SW FED CLT PKUP CLT EMP SW OPTICAL UNIT UPPER UNIT 53313 22V MRR MOT D MRR MOT C MRR24V MRR MOT B MRR MOT A MRR HOM SCN MOT D SCN MOT C SCN MOT B SCN MOT A LNS MOT D LNS MOT
52. 5 TOSHIBA Lower exit roller it out in the direction of the arrow Paper exit switch Remove one screw 12 3 8 When installing the lever caps pay attention to their Lever caps orientations The projection for preventing removal of each lever cap should face front side 12 3 9 Separation claws 6 1 Remove the inner cover lower left 1 screw 2 Remove the separation claw unit 1 screw Oct 1995 TOSHIBA 12 Paper exit switch Lower exit roller Projection for preventing removal 1550 FUSER 3 Remove the upper cover the separation claw unit 2 screws 4 Remove the bracket from the separation claw unit 4 screws Bracket 5 Remove the lower cover 4 screws 1 unit screws 2x2 Take off the six claws from the claw 1 holder Lower cover 1550 FUSER 12 88 Oct 1995 TOSHIBA Note When reinstalling the lower cover refer to the lower figure Rear side Aligning the 2 fixing screws of lower bracket with the rear side of oblong hole fasten them in place Aligning the 2 fixing screws of lower bracket with the front side of oblong hole fasten them pe in place Bracket July 1996 O TOSHIBA 12 90 1550 FUSER 12 4 Heater Control Circuit 1 Temperature detection unit In order to control the temperature of the heat roller the temperature detector unit detects the hea
53. 5 Installing the paper guide 1 The paper guide 09 provided has its metal guide section and outer panel section joined by magnets Separate them when installing the paper guide 2 Insert the separation roller pressure spring 09 provided into the hole in the separa tion roller holder at the feed side of the MY 1004 3 Plug the connector of the paper guide into the connector J36 from the feed side of the MY 1004 Oct 1995 TOSHIBA 18 15 1550 UNPACKING PROCEDURE 4 Fasten the paper guide 09 using the fixing screws 9 provided as shown 4 places Note When fastening the paper guide 9 Fm EEE check to make sure that the separation roller pressure springs are fitted in the separation roller holders of the copier and the MY 1004 respectively 5 Close the outer panel of the paper guide 9 HI 6 Reinstalling the rear covers 1 Reinstall the rear covers of the copier and the MY 1004 2 Return the cassettes to the original posi UNGER tions respectively C Operation Check of the MY 1004 1 Plug the copier s power cord into the elec trical outlet and turn on the power switch 2 Set sheets of paper in the MY 1004 s cas sette 3 Selecting the MY 1004 s cassette make few copies and check that
54. 50 OPTICAL 7 3 9 Mirror 6 Remove the process unit 1 2 Remove the mirror 6 s cover 1 screw 3 Remove the mirror 6 s bracket 1 screw 4 Move the mirror 6 s bracket in the directions of arrows and 2 and take out the bracket Mirror 6 s bracket Mirror 6 1550 OPTIGAL 7 14 Oct 1995 O TOSHIBA 7 4 Pulse Motor 7 4 1 Pulse motor drive circuit constant current type M2 The scanning motor is driven by hybrid IC STK6712BMK3 of the unipolar constant current chopper drive The driving circuit for phase A and A is shown below The same circuit is also used for the drive of phase B and phase B 24V 5V R11 R10 R9 i i ON OFF CEU NET dem AL C10 SG 5VSW 25 g D2 Edi ANN CPU ANN oA A Tdi NC Vre 35 2 3 15 13 8 12 9 GE 2222 Som Drive voltage regulator R9 1 PG 4 DG SG 5 Internal equivalent circuit of STK6712B E S a a 1 SG 77 The circuit composition in the IC consists of each phase excitation switching section IC2 a driver F1 F2 a comparator IC1 and an electric current detection resistance R11 The circuit operation in the case of excitation of phase A is described below Oct 1995 O TOSHIBA 7 15 1550 OPTIGA
55. 58 6 6 MOT ON VDD we lee 3 7 7 GND GND 16 7 2 CRG HOME 8 VDD OPT FAN R 17 8 1 9 9 EXP PWM OPT FON 18 _9 5 10 10 PS LRG 2 111 11 GND 1 uz 12 BIFF J 21 4 CTR SIG 3 15 SP VREF CTR CNT 4 16 HVT SP ON 5 17 HVT GB ON e 18 GND 7 19 HVT TR ON GND 8 20 DG VDD 9 21 24V VDD 10 22 G VREF VDD HVT M ON DSP DAT 10 M VREF DSP SCK 11 s DSP LTH 12 DSPAST 19 2 2 TNR MOT DSP ON1 15 31 3 TNR FULL 4 4 GND SCNO 16 1 1 5 5 DEV SW SCN1 17 2 13 2 6 GND SCN2 18 3 12 3 7 7 ATS VREF SCN3 19 4 11 4 81 8 aV SCN4 20 5 10 5 9 9 ATS VIN 50 5 21 6 9 6 101 10 DG K RTNO 22 7 8 7 11 11 DRM THMS K RTN1 23 7 8 die 12 GND K RTN2 24 9 6 9 K RTN3 25 10 5 10 K RTNA 26 11 4 11 2 14 LED CN ON 5 27 12 3 12 3 15 24 K RTN6 28 13 2 13 4 16 GNDE 7 29 14 1 5 17 5VE 15 6 18 LED SCK 7 19 LED DAT 8 20 LED LTH 9 21 GND 10 22 VDD 11 23 24v e 26 a a 22 588 ERSON 2502 535 o 0 2 zzoo 9 88 gozoro oro t G idag e 5 88 025886289 9896689 GASHEER 95259628 BooaTELS er 5 SOOT SAS THOR HAO THOR OO d
56. 9 dO1S HV3 12 941 10 UONOUN eu ejgissod se se eunsodxe au 10 HIAVS ADHINH au 5594 Ag 1 pe1ouBi SI suojeJedo y YIM JO euiuoeyw o Buines B1auJ Jeded 1e9 5 18u0 ssed g pauasu jou 1ejunoo 1900 Jeded ppy 4 Apeoy dn fay fex OLOHd H3AVS NOLLD Tag 9 nsodxe aunsodxe fei S gous AOH3N3 31135509 3809023 18189 rava7o OLN OHd3H uoneJjedo 1550 DISPLAY Oct 1995 TOSHIBA 5 4 LED Display Circuit 1 LED display method Described here is the LED for dual page copy ing display when comes When the R3 Electrical DSPONO signal goes to L level transistor Q2 R4 STIEN m is turned ON When pin 7 ofthe 015 goes DSPONO to L level electrical current flows through the i E D transistor to the LED DP from 5 In other PWA PNL words the L
57. 9 co Max 200 sheets Heat roller AC 3 6 kV 900 W 1000 Hz D Main charger A negative electrostatic charge is placed on the photoconduc tive photosensitive surface of the drum 2 Exposure Forms an electrostatic latent image on the photoconductive surface of the drum 3 Development Positively charged toner is at tracted to the photoconductive surface of the drum to form a visible image 9 Transfer bias 5 Transfer Raises transfer efficiency Transfers the visible toner im age from the surface of the drum to the copy paper Oct 1995 TOSHIBA 3 1 lt 5 6 Separation 7 Fixing Cleaning 9 Discharging eraser array Toner Carrier Development Magnetic roller Bias 200 VDC Manual feed Cassette paper feed 500 sheets DC 1 2 kV copy paper is separated from the surface of the drum together with the toner image The toner image is fixed to the copy paper by heat and pres sure Any toner remaining on the photoconductive surface of the drum is mechanically removed by the cleaning blade Erases the electrostatic charge remaining on the photoconduc tive surface of the drum 1550 PROCESS 3 2 1550 Copying Process Process 1550 1 Drum OD 1550 OPC 60 1 Sensitivity Highly sensitized drum 2 Surface potential DC 700V Scolotron system 2 Charging
58. AD5 P04 AD4 P03 AD3 P02 AD2 x2 P01 AD1 1 P00 ADO NMI EA TMP96C141AFZ 1 10W4700 1 10W4700 1 10W4700 1 10W4700 1 10W4700 1 10W4700 1 10W1000 1 10W4700 1 10W4700 1 10W4700 HTR ON CTR CNT HTR RDY HTR ON CTR CNT HTR RDY 5VSWON 5VSWON STORE STORE WR A WR RD RD 24VCHK 24VCHK DR SW2 DEV SW PLL OK DR SW2 DEV SW PLL OK ref 1 10W1M 1 3 x 2 85 1 10W4700 c33 2200 50 R84 1 121 10W100 w i21 10W4700 1 15 R102 1 10W4700 i21 10W4700 i21 10W4700 1 10W4700 1 10W4700 2 1 10W4700 2 1 10W4700 212 897 R88 1 D8 1 10W4700 1 10W4700 2 1 10W4700 1 10W4700 2 1 10W4700 2 1 10W4700 R56 1 D1 A16 a16 D 0 15 D 0 15 WDT A WDT ALE ALE 14 1 1550 CIRCUIT DIAGRAMS nvaan Invussol 5 1 aaun 1 51 4 1 5 5 1 nosua NO N2 221 T NOS H NOS ATALOK NOLON Ms 15uU 2155 2 1 5 1 51215 21215 TTZIS 012151
59. Basically the machine should not be operated with any parts removed or disassembled 1 SPECIFICATIONS ACCESSORIES AND OPTIONS 1 1 Specifications Copy process Indirect electrophotographic process dry jose dre Desk top Exposure type Slit exposure with fixed table Original size Type Sheets books and three dimensional objects Maximum size A3 or Ledger Copy paper Size Thickness Cassette A3 A5 R 64 80g m Ledger Statement R 16 221 A3 A5 R 64 130g m un bypass Ledger Statement R 16lb 34lb feeding only Special paper Label paper type recommended by Toshiba and film 80 or more in thickness type recommended by Toshiba bypass feeding only Copy speed sheets minute Actual size Reduction Enlargement Paper size Cassette Manual Cassette Manual A4 B5 A5 R 8 LT STR A4 R B5 R LT R B4 FOLIO LG COMPUTER First copy time About 5 8 seconds 100 A4 LT copier cassette feeding About 8 3 seconds 100 A3 LG LD PFU cassette feeding Warm up time About 28 seconds 100V series About 28 seconds 200 V series Oct 1995 TOSHIBA 1 1 1550 SPECIFICATIONS Multiple copying Up to 999 sheets Setting to adjustment mode allows selection of 9 99 500 and 999 copies Reproduction ratio Actual size 1 1 By setting to adj
60. C LNS MOT B 53313 18V LNS MOT A LNS HOM OPT F ON 00 amp UNH EXT FAN1 EXT F ON EXT FAN2 CTR SIG CRG HOM OPT FAN R MRR MOT D MRR MOT C MRR24V MRR MOT B MRR MOT A MRR HOM AES VIN SCN MOT D SCN MOT C SCN MOT B SCN MOT A LNS MOT D LNS MOT C LNS MOT B LNS MOT A LNS HOM OPT FAN F OPT F ON EXT FAN1 EXT F ON EXT FAN2 K CTR CTR SIG CRG HOM OPT FAN R 14 7 1550 CIRCUIT DIAGRAMS Logic Circuit PWA F LGC 8 8 1550 CIRCUIT DIAGRAMS MOT HVT LRG 53313 24V 1 2 VDD 24V AN 3 4 5 MOT FG MOT DIR PLL OK MOT BRK MOT ON lt 7 8 9 10 11 17513218V 1 2 ES V DG 5VSW VDD FED SW2 2 51213 FED CLT2 PKUP CLT2 RGT CLT2 N MOT FG MOT DIR PLL OK MOT BRK MOT ON EXP PWM EXP ON SP VREF HVT SP ON HVT GB ON TR VREF HVT TR ON G VREF HVT M ON M VREF DR SW2 EMP SW2 FED SW2 MOT ON2 CST2 51210 51211 51212 51213 FED CLT2 PKUP CLT2 RGT CLT2 SORTER HINT 53324 9 How to search for where a signal in a circuit diagram has jumped to 1 SACK s SACK 2 3 S CNT 5 SRXD 6 7 8 lt lt 53324 10 1 lt DF REQ 2 2 3
61. Clearing method Replace toner cartridge and close front cover Toner supply operation toner density is resumed at the proper level Copying is possible 1550 OPERATION 4 8 Oct 1995 TOSHIBA B 3 Replace toner bag The toner bag becomes full of toner 4 The toner recovery auger moves towards the front of the machine Toner full switch S10 will be turned ON 4 Replace Toner Bag symbol is displayed e When the toner full switch S10 comes ON during copying 4 Copying will stop after the last sheet has been exited during copying Clearing method Replace with a new toner bag C 1 Service call When the CLEAR STOP key and the 8 key are pressed simultaneously while the Service Call sym bol is flashing an error code will be indicated in the copy quantity indicator For the contents of the error codes refer to the SERVICE HANDBOOK Oct 1995 O TOSHIBA 4 9 1550 OPERATION 4 4 Flow Charts 4 4 1 After power supply is turned ON Main switch S1 ON DC power ON NO Heater lamp HTR ON YES Start initialization SCN MTR 2 LNS MTR MRR MTR M4 Paper jammed E03 1550 OPERATION 4 10 Oct 1995 TOSHIBA YES Twenty seconds elapsed since initialization Initialization completed Service call 21 Has heater lamp reached specified YES temperature 20
62. ED DP comes ON 2 The actual circuit is controlled as follows 8 8 msec DSPONO and DSPON signal goes to L desc DSPON1 TR2 TR2 level alternatively for 8 msec OFF ON e Q1 or Q2 goes to the ON condition when DSPONO TR1 TR1 the DSPONO or 1 signal is at L level LED ON OFF signal from LGC is in won X X X KK KIKE putted to the IC SIN pin 5 terminal via the DSPDAT signal serial data nm LJ LED ON OFF signal is outputted in parallel LED w fw to D1 D16 output terminal after being in LED 01 ON ON putted to IC in series 1550 DISPLAY 5 4 Oct 1995 TOSHIBA Conditions for LED to come D The transistor Q1 or Q2 connected on the anode side of LED is ON 2 The output connected to the cathode side of the LED is at L level When above are fulfilled the LED is turned ON Listed below are the names of LEDs of which ON OFF is controlled by the DSPONO signal and the DSPON1 signal DSP ONO DSP ON1 2 IN 1 SRV APS ADFJ AMS SRTJ Oct 1995 TOSHIBA 1550 DISPLAY 6 DRIVE MECHANISM 6 1 Construction The drive mechanism is so constructed as to drive the drum developer unit heat rollers including the cleaning felt roller paper exit roller and paper feed rollers copier s and PFU s transport rollers by means of the main motor Oct 1995 O TOSHIBA Ea p S
63. Function Remarks Page item No PFU MOT Drive motor Drives the pick up and feed 2 118 rollers RGT2 CLT Controls the rotation of the 15 Transport roller clutch transport roller PKUP2 CLT Controls the rotation of the P2 14 Pick up roller clutch pick up roller FED2 CLT Feed roller clutch Controls the rotation of feed roller P2 14 PSTP2 SW Detects the paper fed from the 0 lt 3 Paper stop switch cassette It also detects when the feed clutch is turned OFF EMP2 SW Empty switch Detects when the cassette runs Reflective type out of paper photosensor DOOR2 SW Door switch Detects whether or not the part N cover is open SIZE2 SW Detects the cassette size or Cassette size switch whether the cassette is install ed or removed Oct 1995 TOSHIBA 13 3 1550 OPTIONAL 13 3 Functions and Operation 13 3 1 Paper feeding operation View as seen from the front D Pick up roller 2 Paper feed roller 3 Separation roller Transport roller right 5 Transport roller left Paper stop switch 7 Aligning switch Aligning roller upper 9 Aligning roller lower Ne 22 View as seen from the rear Drive motor 69 Pick up roller clutch Feed roll
64. L Phase excitation process D becomes L level A is level 2 The reference voltage which is determined by a resistance type potential divider of R9 R10 and R11 is applied to reverse input for comparator and non reverse input B is L Therefore IC1 s output becomes L level Due to 0 and 2 above of IC2 becomes L level and F1 becomes ON conductive state Electric current flows to coil A from the 24 V power supply and increases gradually The terminal voltage the electric current detection resistance R1 increases and as the B voltage gets higher than voltage becomes level and F1 becomes OFF S coils A and A are bipolar wound the energy accumulated in coil A is induced into coil A and discharged using coil A In other words the electric current flows in the direction of DG gt R9 gt F2 diode coil A D The voltage accumulated in capacitor C1 decreases and when it gets lower than voltage goes to L level and F1 comes ON again to increase the phase A winding electric current The above ON OFF operation constant current chopping of the electric current for the motor is repeated refer to the diagram below gt Form of electric wave that flows into the motor When exciting phase A phase A becomes L level while F2 becomes and a similar operation is conducted
65. Main charger Discharge lamp LED erasing array Transport guide Drum Pre transfer bias guide Separation charger Transfer charger Process unit LED erasing array Discharge am Charging unit m Main charger Drum High voltage transformer Lower unit Transfer separation charger Pre transfer bias guide Transfer guide Oct 1995 TOSHIBA 9 1 1550 DRUM 9 2 Explanation of Functions 9 2 1 Main charger discharge lamp and LED erasing array Main charger Places a negative charger on the drum through a high voltage transformer Discharge lamp Eliminates the residual charge on the drum af ter cleaning LED erasing array Erases the unnecessary parts of the latent im age formed on the drum 9 2 2 Transfer separation chargers 1550 DRUM Transfer charger Helps transfer the toner image on the drum to the copy paper through a DC high voltage transformer Separation charger Strips the copy paper along with the toner im age from the drum through an AC high volt age transformer Discharge lamp Process unit Main LED erasing array charger Separation charger Transfer charger Oct 1995 TOSHIBA 9 3 Disassembly Replacement 9 3 1 1 Remove the toner cartridge Process unit 2 After removing one screw pull out the entire unit to the front and take it out Notes 1 When pulling out the un
66. N or flash when the attention of the operator needs to be drawn 82 al 0 3 6 CD 190 EH Ela CED 5 03 C o CaT TP ENERGY DUAL PAGE SAVER COPY TD Gs ED D 65 154 p 03 OD Els GROUP SORT SORTER INTERRUPT SSETTE ta I EN gii E 6 200 ees yt x gt LIGHT AUTO DARK IMAGE MODE CLEAR STOP 20008 2 For the U S A Canada Oct 1995 O TOSHIBA 5 1 1550 DISPLAY 5 2 Items Displayed on Control Panel During normal copying operation During warm up When the power switch is turned ON the print key lights up red until capable of copying The copy quantity and reproduction ratio display show condition When the machine is capable of copying condition the print key lights up green and the copy quantity and reproduction ratio show 1 While copying When the print key is pressed the print key lights up red The copy quantity display displays a countdown and finishes at 1 After completion of copying the copy quantity indicator returns to the initially set number e Ifa fault occurs copying is not possible flashes The symbol is displayed when the cassette selected has no paper includ ing Insert Cassette
67. PONOC DSPONIC DSPONOC DSPON1C 14 10 Oct 1995 O TOSHIBA How to search for where signal in circuit diagram has jumped to Control Panel Circuit PWA F PNL 2 4 DSPONOC DSPONOC DSPON1C DSPON1C DATA16 DATA15 VSSDO IC2 LTL16KY GROUP 29 LTL16KY Oct 1995 TOSHIBA 14 11 1550 CIRCUIT DIAGRAMS How to search where signal in Control Panel Circuit PWA F PNL 3 4 2 circuit diagram has jumped to 222 00 2 m 1550 CIRCUIT DIAGRAMS 14 12 Oct 1995 TOSHIBA How to search for where signal circuit diagram has jumped to m o a Control Panel Circuit PWA F PNL 4 4 m fu Oct 1995 TOSHIBA 14 13 1550 CIRCUIT DIAGRAMS 14 4 Fuser Circuit PWA F FUS cel gt TA de0d 042 22 042 627 400 2 5 621 400 2 49 Oct 1995 TOSHIBA 14 14 1550 CIRCUIT DIAGRAMS 15 POWER STABILIZING CIRCUIT AC UNIT 15 1 General Description This power supply circuit has the following outputs D DC outputs e 5 Supplied to LSIs logic ICs driver ICs etc e 5VE Power supply for LED eraser array DCH 24VA Power supply for the main motor 1 e 24VB Power supply for clutches and high voltage transformer e 24VC Power supply the optional sorter
68. Print key ON Main charger transfer charger separation charger transfer bias discharge lamp and LED eraser 19 Optical fans M6 M7 exit 8 start rotating at high speed Main motor M1 ON Drum developer heat roller and paper exit roller rotate Subsequently operations for automatic feed copying 3 6 are continued by the use of the print 9 4 2 5 Interrupt copying 1 Press interrupt key Interrupt lamp comes ON The copier temporarily interrupts the copying operation and carriage 1 and carriage 2 return to their fixed position Automatic exposure goes into the reproduction ratio 100 copy mode The copy quantity indicator remains unchanged 2 Select desired copying conditions single sheet copying only is possible 3 After interrupted mode copying has finished Press the interrupt key then the interrupt lamp goes OFF and the conditions prior to interruption are resumed 4 Press print key Copying operations prior to interruption are resumed Oct 1995 O TOSHIBA 4 5 1550 OPERATION 4 3 Fault Detection If a fault occurs in the copier a symbol corresponding to the type of fault will be displayed in order to draw the attention of the operator Classification of faults A Faults which can be cleared without turning OFF the door switch S2 yellow flashing display on the display panel 1 Add paper 2 Insert key copy counter 3 Rep
69. Speed comparison phase Phase W Phase U l F MTR REF switching PLL OK Hall element A Hall element C 4 MAIN CW CCW MTR BRK Rotor 1 MAINMTR ON position Lock detection protection circuit Main motor M1 1550 LGC outputs a control signal for main motor rotation MAIN CW CCW Rotation direction MAIN MTR ON Motor rotation command The excitation phase switching section excites each phase of the main motor main motor rotates Hall elements A C detects rotation position of motor rotor The excitation phase switching section switches the excitation of each phase By repeating 2 through 4 the motor continues to turn An FG pulse is generated by FG pattern attached to the main motor The FG pulse and the reference frequency are compared for their phase and speed and their differences added to IC3 Change the switch timing of the excitation phase switching section according to the signal obtained at 6 above Control so that the FG pulse and reference frequency are equal gt main motor rotates at a fixed speed lock range condition As the main motor goes into the lock range condition the excitation phase switching section out puts a PLL OK signal to LGC L level When MTR BRK from LGC goes to L level the brake is applied to rotation of the main motor and when the MAIN
70. ad the same procedure as for the main charger applies 1550 DRUM 9 Cassette Transfer separation charger Terminal cover Transfer entrance guide Supporter Terminal cover Oct 1995 O TOSHIBA Notes 1 Pay attention to the direction in which the spring hanger on the front faces 2 The charge wire should be placed se curely in the V grooves on the front and rear sides Dont allow the wire to kink Don t touch the wire with bare hand The supporter should be fitted securely in the hook and groove 9 3 7 Damp heater unit Option 1 Remove the transfer separation charger 2 Remove the transport guide one screw 3 Remove one screw securing the damp heater 4 Remove the inner cover lower left and left side cover lower 5 Remove the rear cover 6 Remove connector Oct 1995 O TOSHIBA 9 Damp heater unit 1550 DRUM 9 3 8 Transfer separation terminal 1 Remove the transfer separation charger 2 Remove the rear cover and disconnect three connectors 3 Remove one screw 4 Pull the transfer guide toward the front slightly and lift it out Note Be careful not lose the charger push up spring b Remove the two hooks and then take out the transfer separation terminal from the front side 1550 DRUM 9 Connector Springs Transfer guide Transfer separation term
71. ain switch door and switch unit see item 2 4 2 E 2 Remove the connector of the lens motor 3 Remove the lens motor 2 screws Note The shape of the mirror motor and the lens motor is same but the output is different Mirror motor silver maker name Lens motor red maker name 7 3 5 Home switch mirror switch and lens switch Home switch 1 Remove the top cover 2 Remove the switch by disengaging its claws Mirror switch 1 Remove the original glass 2 Remove the optics cover 1 screw 3 Move both carriages 1 and 2 to the exit side and the mirror unit to the feed side 4 Remove the switch by disengaging its claws 1550 OPTIGAL 7 Lens motor Connector Main switch door switch unit Home switch Mirror switch Oct 1995 O TOSHIBA Lens switch 1 Remove the original glass 2 Move the lens unit to the feed side 3 Raise the upper unit 4 Remove the duct fan 1 screw 5 Remove the switch by disengaging its claws 7 3 6 Exposure lamp and thermofuse 1 Remove the original glass 2 Align carriage 1 with the cutout section of the frame Exposure lamp 1 While pushing the lamp toward the front disengage it from the supply blade Notes 1 During replacement don t touch the lamp surface with bare hand 2 careful not to allow the lamp to get scratched by the wire Oct 1995 O TOSHIBA Lens u
72. al bar indicates the same shaft 924 FUSER UNIT FEED L To PFU CLT DRIVE D L Main motor No of gear teeth 10 No of gear No of gear FEED U teeth 75 teeth 16 No of gear No of gear ALN CLT No of gear teeth 34 teeth 20 020 lower teeth 40 roller No of gear No of gear No of gear teeth 34 teeth 15 teeth 30 CL roller 020 ALN upper roller 15 No of gear No of gear No of gear No of gear teeth 14 teeth 19 teeth 34 teeth 30 No of gear No of gear teeth 15 No of gear NO teeth 26 teeth 40 teeth 60 CL roller 20 H R ot gear Pick up 0 030 053 teeth 20 CLT 20 teeth ES 029 99 2 No of gear teeth 18 No of gear teeth 20 Paper feed CLT 20 No of gear teeth 18 Oct 1995 O TOSHIBA 6 2 of Functions Drum drive Transmits the rotation of the main motor to the gears and drum drive gear to drive the drum Developer unit drive Transmits the rotation of the main motor through gears to the developer unit drive gear to drive the developer unit Heat roller drive Transmits the rotation of the main motor through gears to the heat roller gear to drive the heat roller Exit roller drive Drives the exit roller gear through gears Copier s al
73. cedure 1 Make sure that AJ is shown on the display 2 Set exposure mode 0 3 Set reproduction ratio D using the REDUCE li ENLARGE ZOOM DOWN or ZOOM UP TON 4 To check the current image density make test copies in the manual automatic and photo modes and check them for proper image density 5 Key in adjustment code and press the PRINT Then using the procedure of 7 11 in Sec 2 1 make adjustments 6 Finally press keys 0 and 9 simultaneously to clear the test mode Oct 1995 TOSHIBA 18 9 1550 UNPACKING PROCEDURE Changing the Paper Size of the Cassette 1 Pull out the cassette and push down the bot tom plate Then move the both side guides and trail edge guide to align them to the desired size Before moving the side guides push the lever in the direction of to unlock the side guides Before moving the trail edge guide push on its sides in the direction of B to unlock the guide 2 Take out the paper size plate from the cassette and reset it to show the desired size on the dis play 3 Place the paper on the cassette and check the gaps between the paper and the side guides 4 Insert the cassette gently 1550 UNPACKING PROCEDURE 18 10 Oct 1995 TOSHIBA Procedure for Installing the Toner Cartridge 1 Open the front cover and pushing the lock le ver take out the toner cartridge from the front side
74. de cover Feed side cover Open the front cover Raise the upper unit Remove three screws Right side cover lower Open the front cover Raise the upper unit Remove two screws Right side cover upper Remove two screws Remove the glass holder see 2 4 1 Oct 1995 TOSHIBA Feed side cover Right side cover lower Right side cover upper 12 1550 GENERAL cover and glass holder Glass holder Open the original cover e Remove two screws Top cover Remove the original cover Remove three screws F Rear cover Remove two screws 1550 GENERAL Top cover Glass holder VE 3 Rear cover 13 Oct 1995 O TOSHIBA Left top cover left side cover upper and left side cover lower 1 Raise the upper unit Left top cover Remove the original scale Two screws Remove two screws Left side cover lower Remove two screws Left side cover upper Remove one screw Oct 1995 TOSHIBA 2 Left top cover Original scale 3 We j N Left side cover lower Left side cover upper 1550 GENERAL 1550 GENERAL Control panel cover 1 Raise the upper unit and remove the inner cover upper 2 Disconnect two connec
75. e cassette Oct 1995 TOSHIBA 18 15 ADD PAPER symbol flashing 1550 OPTIONAL Has the copier YES lt sent a paper feed gt request to PFU During ready Ready for feeding paper period Is the cover open Ready for feeding paper Both feed and pick up roller clutches ON Drive motor ON Paper stop switch No Have 1 238 sec Passes after the feed NO roller clutch became YES 0 15 sec delay Feed roller clutch OFF 1550 OPTIONAL 13 16 Oct 1995 TOSHIBA Has 0 83 sec elapsed after the preceding copy NO passed over the PFU s stop switch Oct 1995 O TOSHIBA Is the copier s aligning switch ON Delay corresponding to the copier s aligning time Transport roller clutch OFF Has the copier paper feed YES request to PFU Paper feeding operation complete 18 17 Transport roller clutch OFF Has 0 83 sec elapsed after the preceding copy passed over the PFU s stop switch YES Transport roller clutch ON 1550 OPTIONAL 1550 OPTIONAL Paper jam Motor and all clutches OFF CLEAR PAPER symbol flashing NO Is the cover open NO Is the cover closed Paper stop YES switch ON CLEAR PAPER symbol OFF 13 18 Oct 1995 O TOSHIBA 13 5 2 4 lateral single sheet copying PFU Timing chart 0 1 2 3
76. e drum shaft lock by rotating it in the direction of the arrow and then pull the shaft out from the front Whenremoving the drum place your hands on the sides of the drum as shown in the figure on the right and take it out carefully Oct 1995 TOSHIBA 11 Front side Drum shaft 1550 CLEANER Notes 1 When setting the drum the process unit its smaller drive gear should be on the rear side 2 After inserting the drum shaft apply patting powder on the entire surface of the drum and rotate the drum toward you The figure on the right shows the cleaner unit after the developer unit main charger unit and drum are removed from the process unit 1550 CLEANER 11 Smaller gear Rear side Larger gear Front side Drum Cleaner unit Oct 1995 O TOSHIBA 11 3 2 Main blade 1 Remove the developer unit main charger unit and drum 2 Remove the spring 3 Remove the holder on the rear 1 screw 4 Remove the blade Oct 1995 O TOSHIBA 11 Main blade Spring 95 0 apt o 2 Holder 5 1550 CLEANER 5 Remove the collar on each side of the blade and install them to the new blade Notes 1 During reassembly attach the spring securely Make sure that the frame side should look as shown below 5 Spring 2 Af
77. e sent toward the aligning roller If as shown two sheets are fed at the same time since the friction between the sheets is smaller the lower sheet is stopped being fed any further while the upper sheet is forced to be transported by the feed roller in the direction of the arrow gt 1550 FEEDER Feed roller gt Separation roller Oct 1995 TOSHIBA 8 3 Disassembly Replacement Depending upon the locations of the parts to be disassembled or replaced covers should be re moved or the upper unit should be opened as re quired 8 3 4 Upper paper feed unit 1 Remove the transfer separation charger unit 2 Remove the feed harness cover 1 screw 3 After removing one screw and disconnecting one connector pull the unit out to the front and lift it out Aligning switch 1 Place the upper paper feed unit upside down 2 Remove the paper dust brush 3 Disengage three claws and disconnect one connector Oct 1995 O TOSHIBA 8 Feed harness cover Upper paper feed unit Aligning switch 1550 FEEDER Clutch aligning rollers upper lower 1 Remove the plate spring 1 screw 2 Snap off the clip 3 While pushing down the claw pull out the bush ing toward the front 4 Disconnect one connector 5 While pushing down the rear claw pull out the bushing toward the rear 1550 FEEDER 8
78. en from the rear View as seen form the exit side Immediately after the power on Both the lens unit and the mirror unit move from the position where the switches lens switch and mirror Switch are turned on toward the feed side arrow direction respectively If the lens and mirror units were in the off position they first move toward exit side then after turning on the switch move a specified amount toward the feed side and stop at the actual size 10096 position When a reproduction ratio is selected When a copy reproduction ratio is set the lens unit and the mirror unit move to their respective positions for the specified reproduction ratio Oct 1995 TOSHIBA 7 5 1550 OPTICAL 7 3 Disassembly Replacement At the time of disassembly or replacement first remove the covers process unit original glass etc as required 7 3 1 Auto exposure PC board and damp heater 1 Remove the original glass and move carriages 1 and 2 to the exit side 2 Remove the optics cover 1 screw Optics cover Damp heater Option Remove three screws three clamps and dis 2 connect connector Damp heater Connector Auto exposure PC board Remove one screw disconnect one connector and the PC board can be replaced 1550 OPTICAL 7 6 Oct 1995 TOSHIBA 7
79. energized to rotate the pick up roller 4 and feed roller 5 starting paper feeding Electromagnetic clutch 02 for the pick up roller is de energized with the paper left pushing the aligning switch paper is aligned by the aligning rollers and the electromagnetic clutch 3 for the feed roller is de energized the aligning roller clutch comes ON then the paper is sent to the trans fer process 8 2 2 Paper separation operation Since no paper separation claws are used in the cassette a paper separation roller is installed in side the machine The separation roller section consists of a paper feed roller one way clutch separation roller spring joint etc as shown The feed roller is equipped with a weight and ro tates in the direction of the arrow the same timing with the pick up roller The separation roller shaft equipped with a torque limiter based on spring joint is designed to rotate in the direction of the arrow 4 and transmits its rotation to the separation roller through the spring joint Oct 1995 O TOSHIBA 8 One way clutch Feed roller Spring joint torque limiter Separation roller PSA I 1550 FEEDER For example when only sheet of paper 1 is sent to the separation area since the feed roller s transporting force is stronger the separation roller is forced to rotate in the direction of the arrow causing the sheet to b
80. ens unit and mirror unit respectively move to the positions corresponding to the four reproduction ratios making the expo sure lamp also to light four times Note Do not touch the machine while it is performing automatic exposure ad justment When the display changes to AJ the au tomatic adjustment is complete Make copies at the respective reproduction ratios and check the image density In the AJ mode simply press the ENERGY SAVER key to make copies If the image density of test copies is not appropriate for any reproduction ratio make adjustments in Sec 2 4 Automatic exposure adjustment d e f or g for the inap propriate reproduction ratio 74 NN Blank copy paper 78 gt LT R LG 27 PRINT 65 LT R gt ST R LD LT R lt I PS 5 gt gt gt 41414 129 R p COMP gt Oct 1995 TOSHIBA 2 4 Manual adjustment of exposure Note Only when the user is not satisfied with the results of the exposure adjustments in Sec 2 2 and 2 3 perform the manual adjustments of exposure a m as described below Adjustment procedure Exposure mode Reproduction ratio Adjustment code Manual exposure center Automatic exposure Light max Dark min Photo exposure Adjustment Pro
81. er clutch 69 Transport roller clutch 1550 OPTIONAL 13 4 1995 When the key is pressed sheets of paper start being fed from the paper feeding unit PFU in the sequence described below 1 About 0 1 sec later the drive motor is energized causing the pick up roller and paper feed roller 2 to rotate The pick up roller is rotated through the pick up roller clutch The paper feed roller is rotated through the feed roller clutch 09 and the transport rollers are rotated through the transport roller clutch 9 The transport rollers are driven by 5 main motor 19 top sheet of paper in the cassette is fed out by the pick up roller to the paper feed roller which separates the top sheet from other sheets if more than one sheet has been fed out and sends only the top sheet to the transport roller When this sheet turns on the paper stop switch located under the transport roller the feed roller clutch 09 pick up roller clutch and drive motor are deenergized causing the pick up and paper feed rollers to stop At this time if the copier s aligning switch 7 is off the transport roller clutch maintains an on status until this switch is turned on But if the copier s aligning switch is on the transport roller clutch is deenergized csusing the rollers to stop E When the copier s aligning roller is turned off transport roller clutch is turned on the rollers start rotating aga
82. f the devel oper unit 1 Remove the process unit 2 Disconnect the developer unit connector 3 Lifting the levers take out the developer unit 10 3 2 Installing the developer material 1 Remove the top cover by rotating the two plate spring hooks in the direction of A and moving the cover in the direction B Note While doing the above be careful not to dam age the seal affixed to the back side of the top cover Oct 1995 TOSHIBA 10 Developer unit connector Levers 1550 DEVELOPER 2 Remove the cap from the developer bottle and install the nozzle service jig to the bottle Pour the developer material into the developer unit 3 After pouring in the developer material rotate the gear in the direction of the arrow as shown to deliver the developer material onto the mag netic roller 4 Reinstall the top cover after inserting the hooks 4 places firmly fix the plate spring hooks by rotating in the direction of arrow securely Plate spring hooks 1550 DEVELOPER 10 4 Oct 1995 O TOSHIBA 5 Pay special attention to the overlapping of the side shields front and rear and the rubber seal when installing the top cover the rubber seal should be over the side seals Side seal Rubber seal 10 3 3 Removing the developer material While tilting the developer unit let the developer material drain out from
83. feed roller clutch CLT2 and the pick up roller clutch CLT3 come ON The pick up roller and paper feed roller rotate After a pre difined period the pick up roller clutch CLT3 goes OFF Oct 1995 TOSHIBA 4 1 1550 OPERATION Aligning operation Paper arrives at the aligning roller Aligning switch 55 ON After a pre difined period feed roller clutch CLT2 goes OFF Paper feeding complete Carriage operation Exposure lamp ON Carriage 1 and carriage 2 forward operation starts Scanning motor M2 ON At this time if the toner density of the developer material is lower than the set value toner replenish ment is performed Toner motor M9 is turned ON When a fixed time has passed since the carriage operation Paper is transported to transfer section transport is promoted aligning roller clutch CLT1 is turned ON and the copy quantity counted Carriage scanning complete Scanning motor M2 is turned OFF The main charger and the exposure lamp are turned OFF Aligning roller clutch CLT1 is turned OFF The timing varies according to paper used Paper exit operation The exit switch S6 detects the trailing end of the paper passing The main motor 1 transfer charger separation charger transfer bias which is turned ON OFF in accordance with paper feeding discharge lamp and LED erase array are turned OFF Optical fans M6 M7 stop and exit fan 8 starts rotating at l
84. ft side cover upper in ner cover and control panel 2 Remove carriage 1 and the wire fixture ET each screw for the front and rear Note Be careful not to get hitched by the wire 3 Using the wire holder jig fasten the wire on the shaft so that it does not loosen mo at both front and rear Note The front side wire can be identified by its mark on the metal portion Front side wire Rear side wire R Oct 1995 TOSHIBA 7 11 Cutout section Cutout section Carriage 1 Wire holder jig View as seen from the feed side 1550 OPTICAL After having loosened the wire tension adjust 4 ment screw disengage the hook on the feed side for both front and rear 5 Remove carriage 2 6 Remove the scanning motor 3 screws 1550 OPTIGAL Carriage drive wire Hook Carriage 2 Scanning motor E bz 21115 von via EE I RR Oct 1995 O TOSHIBA 7 Remove the pulley on the rear side 1 screw 8 Loosen the screw for the wire take up pulley located inside the frame for both front and rear 9 Remove the stop ring from the shaft front 10 Pull out the shaft from the rear Oct 1995 TOSHIBA 7 Wire take up pulley Stop ring 13 15
85. he following circuits Drive winding Magnetic head which receives a high frequency magnetic field primary side When placed in developer material it forms magnetic circuit Detection winding Receives the changes in magnetic resistance of the developer material via a magnetic circuit secondary side DC conversion circuit Converts the high frequency output emitted from the detection winding to a DC signal x Auto toner output VATS Auto toner DC output Detection conversion circuit VATS Drive winding To microprocessor Magnetic circuit 1550 DEVELOPER 10 12 Oct 1995 TOSHIBA When the toner density is low The toner amount in the developer material is less than the required level in comparison with the iron powder carrier Magnetic reluctance Small gt detection output Large gt Auto toner output VATS Large When the toner density is high The toner amount in the developer material is more than the required level in comparison with the iron powder carrier gt Magnetic reluctance Large gt detection output Small gt auto toner output V Small e voltage corresponding to toner density in the developer material auto toner output VATS Oct 1995 TOSHIBA 10 13 1550 DEVELOPER 11 CLEANER UNIT Shares Part of the Process Unit 11 1 Construction The cleaner unit consists of the main blade recovery blade toner recovery auger t
86. heck Making copies in both the cassette and bypass feeding modes check the following items Check for correct paper feeding from both the cassette and sheet bypass e Check for proper copy image e Check for correct displaying of the control panel lamps and the correct operation of the keys Note Dispose of the packing materials properly E Changing the Image Settings 1 Light distribution adjustment 1 With the exposure set at a darker point make a copy of the test chart and check for uneven light distribution 2 If necessary make adjustment in the fol lowing manner a Turn off the power and unplug the power cord plug Then remove the right hand top glass holder 2 screws and the glass Loosening the screw of the adjustment plate corresponding with the position of the uneven light distribution adjust the plate If you move it toward the left copy im age becomes darker and if you move it toward the right copy image becomes lighter If the rear side of the copy is too dark and gradually lighter toward the front adjust the adjustment plates as shown on the right lower Make a copy of the test chart and check for the correct image density 2 Exposure adjustment 2 1 Adjustment of manual exposure 100 1 Turn off the power of the machine While pressing keys 0 and simultane ously turn on the power switch Check that the AJ mode is shown 2 Press the Auto Exposure key to sw
87. ibed PC board and white must be 1550 GENERAL 2 Screws fastening the bracket PWA F LGC TRE 5 Harness White Black color Black White 17 Oct 1995 TOSHIBA Door switch and Main switch power switch 1 Remove the inner cover 2 Remove the feed side cover 3 Remove the right side cover upper 4 5 6 Snap off an E ring Take out the gas spring Remove three screws andtiltthe unittoward you after having shifted it toward the right 7 Removing the respective connectors and screws allows the door switch and the main switch to be removed and replaced Before replacement pay attention to the colors of the connectors and the harnesses Door switch Main switch Connector White White Harness Black White F High voltage transformer for the main charger PS HVT M 1 Remove the rear cover 2 Disconnect seven 7 connectors 3 4 4 Remove two lock supports Remove two screws Oct 1995 TOSHIBA 2 1550 GENERAL Size switch 1 Pull out the cassette 2 Remove two screws 3 Disconnect one connector Note The left screw is tightened with the protec tive cover on the corner of the switch Exit fan 1 Remove the left side co
88. ic and control unit The arithmetic and control unit is composed of the following two blocks EEPROM built in SRAM Consists of IC9 STK10C68 which stores exposure ad NV RAM justment data to ensure that optimal exposure is performed for each reproduction ratio and for automatic exposure sento tante Incorporates software which computes the voltage to be impressed on the lamp in accordance with such copying modes as photographic magnification automatic exposure and manual exposure as well as adjustment data inside the SRAM Oct 1995 TOSHIBA 7 21 1550 OPTICAL 7 6 Lamp Regulator Circuit The lamp regulator performs control to maintain the amout of light of the exposure lamp at constant value by monitoring the AC input voltage Method Detects the AC input voltage 1 e Changes the input voltage to a DC voltage approximate to its effective value by means of the waveform shaping circuit 4 e This DC voltage is compared with the reference voltage made by shaping the pulse signal and is amplified 4 Based on the reference voltage and the input voltage the trigger pulse generation cir cuit generates trigger pulses in synchronism with the frequency of the power supply 1 e Controls the conduction angle of the triac The voltage applied across the lamp is kept consistent Reference pulse signal setting circuit Trigger pulse generation PWM i circuit Pulse signal
89. igning roller Drives the copier s aligning roller through gears e PFU transport roller Drivers the transport roller through the copier s paper feed unit Oct 1995 TOSHIBA 6 3 1550 DRIVE 6 3 Disassembly and Replacement 6 3 1 Main motor 1 Remove the rear cover 2 Disconnect two connectors 3 Remove two screws 6 3 2 Drum drive gear and developer drive gear 1 Remove the process unit 2 screws 2 Remove the cover mirror 6 1 screw 1550 DRIVE Main motor Co NY 6 6 Hr A St N Oct 1995 O TOSHIBA 3 Remove the transfer separation charger Re fer to 9 3 6 4 Remove the transport guide 1 screw and 1 blue connector at the rear E 45 Transport guide 5 Remove the inner cover lower left 6 Remove the fuser unit 1 screw Oct 1995 O TOSHIBA 6 5 1550 DRIVE 7 Remove the lamp regulator two connectors 8 Remove the exposure lamp and power sup ply connector 9 Disconnect the connector for the auto expo sure lens switch and mirror motor 1550 DRIVE Connectors Lamp regulator Connector
90. in At this time since the feed roller clutch 2 is off only the transport roller is rotated sending the sheet fed from the cassette into the copier After the sheet turns on the copier s aligning switch and is aligned by the copier s aligning rollers 9 the transport roller clutch is deenergized causing the rollers to stop After the first sheet s trailing edge has passed the paper stop switch to turn it off when the paper feeding unit PFU receives the next paper feed signal from the copier above sequence of opera tion will be repeated 13 3 2 Detection and clearing of paper jams 1 Within 1 238 sec after a sheet of paper is fed if its leading edge does not arrive at the paper stop switch 6 the jam detection device of the paper feeding unit PFU activates to turn off the drive motor 9 pick up roller clutch and feed roller clutch 2 Oct 1995 TOSHIBA 18 5 1550 OPTIONAL 2 clear the paper jam condition you open the cover of the paper feeding unit PFU remove the jammed paper and close the cover At this time if the paper stop switch 0 continues to be turned on PFU decides that paper still remains in it and does not clear the paper jam status 3 During multicopying from the paper feeding unit PFU if paper jam occurs inside the PFU all the sheets of paper fed before the jammed sheet will be processed normally 1550 OPTIONAL 13 6 Oct 1995 O TOSHIBA 1
91. inal Oct 1995 O TOSHIBA 9 3 9 Main charger terminal 1 Remove the drive unit 2 Remove the gear unit 2 screws 3 After removing the two claws on the front side slide out the main charger terminal to the right Oct 1995 TOSHIBA Gear unit Front side Main charger terminal Claw 1550 DRUM 9 4 Transfer Separation Electric Current Control Circuit 1 Brief description circuit generates voltage Vc for transfer and separation output current control e Change Vc gt changes output current to linear 2 Description of operation Main Digital Adjustment Processor data nV RAM value Analog Output current Transfer separation output adjustment value in nV RAM is fed to main processor e main processor outputs control voltage data through the GA to D A converter Analog conversion made by D A converter Control voltage is fed to transfer separation transformer Transfer separation transformer generates output current which is proportional to control voltage Vc Adjustment of control voltage Vc alteration of adjustment data must be made in AJ mode IC10 J1 B8 O HV TR Vref J1 B9 HV SP Vref nV RAM Transfer separation control circuit diagram 1550 DRUM 9 10 Oct 1995 O TOSHIBA 9 5 LED Eraser Array Brief description LED eraser array a For reduction copying the areas on the LED eraser array
92. ing warm up and standby Automatic feed copying using Print key Copying operation Bypass feed copying nterrupt copying 4 2 Description of Operation 4 2 1 During warm up 1 Copy quantity indicator shows and print key lights up red lamp Heater lamp comes ON Initial position setting for the optical system moves the lens and the mirror to actual size position Exit fan M8 stops and optical fans M6 M7 stop 2 When the heat roller temperature is sufficient for fixing The heater lamp goes OFF The copy quantity indicator shows 1 and the print key changes to green lamp Paper jam release cover to be closed when there is paper in the cassette Exit fan 8 starts rotating at low speed and optical fans M6 M7 stop 4 2 2 Standby ready condition All keys on the control panel are operable When there is no other key entry for a predetermined period the machine is set automatically to a copy quantity of 1 a reproduction ratio of 10096 and automatic exposure 4 2 3 Cassette feed copying using the print key 1 Print key ON Print key display changes from green to red Main charger transfer charger separation charger transfer bias discharge lamp and LED eraser array come ON and optical fans M6 M7 rotate at high speed Exit fan 8 starts rotating at high speed Main motor M1 comes ON Drum developer heat roller and paper exit roller rotate 19 Paper feeding from cassette The
93. it be careful not to touch the drum 2 Inorder not to damage the drum place the unit on the flat surface of a stand 9 3 2 1 Remove the process unit Discharge lamp 2 Disconnect connector 3 Disengage two claws and take out the PC board 9 3 3 1 Remove the process unit Main charger unit 2 Disconnect the one connector 3 Move the entire unit toward the upper to have it disengaged for the rear lock and take it out Note Be careful not to damage the drum Oct 1995 O TOSHIBA 9 Process unit With the control panel removed Discharge lamp Main charger Front side 1550 DRUM 9 3 4 LED erasing array 1 Remove the main charger unit 2 Remove connector 3 Remove screw 0 3 5 Main charger 1 Remove the main charger unit Grid Remove the grid by pulling it toward the rear Note Be careful not to touch the shaded area with a bare hand Charge wire Entire length 353 mm tungsten wire 0 06 mm dia Remove the front and rear terminal covers e Pinching the hook of the rear terminal cover with cross pliers etc will facilitate the removal 1550 DRUM 9 LED erasing array 225 in 1 1 1 JOT aah 2 1 N Spring Charge wire hanger Charge wire Front side Rear side Oct 1995 O TOSHIBA Notes 1 Pay attention to the di
94. itch to manual exposure Check that the Auto Exposure lamp has gone off 3 Using the exposure keys set the exposure level at the center point 1550 UNPACKING PROCEDURE 18 Rear side 1 MN Front side Rear side gt 7 Front side DUAL PAGE OPY i CASSETTE a V LIGHT AUTO DARK PHOTO eaaadimage Mode Oct 1995 TOSHIBA 1995 4 Press the key to set at 100 mode 5 To check the current image density press the ENERGY SAVER key to make a test copy 6 Ifthe image density is not appropriate make adjustment using the following procedure 7 Key in code 1 from the 10 key pad and press the PRINT G key current adjustment value is shown on the display 8 If the image density is too high increase the value by using the ZOOM UP key 9 If the image density is too low reduce the value by using the ZOOM DOWN key 10 Press the INTERRUPT key to cause the new value on the display to be memo rized After you press the key the display re turns to AJ e Press the ENERGY SAVER key to make a test copy 11 If the image density is not appropriate re peat steps 7 10 above 2 2 Adjustment of manual exposure 50 154 and 200 Note Before performing manual exposure ad justment 50 154 and 200 check t
95. lace toner bag This is cleared by replacing the toner bag red flashing display Faults which can not be cleared without turning OFF the door switch S2 no display provided on the display panel 1 Clear paper 2 Add toner yellow flashing display Faults which can not be cleared without turning OFF the main switch S1 1 Service call Add paper When cassette is inserted in the machine the paper empty switch 53 or S16 detects the existence of paper When there is no paper the switch goes OFF When cassette is not inserted in the machine the paper size switch S4 or S18 detects the non existence of cassettes The paper size switches all go OFF When cassette is not inserted in the No paper state machine When cassette is inserted in the Signal is sent to control circuit machine but there is no paper i Add Paper display will flash Print key will be inoperable Bypass feed copying is possible if there is paper on the manual feed guide even when there is no paper in the cassette 1550 OPERATION 4 6 Oct 1995 O TOSHIBA 2 Bypass misfeed During sheet bypass copying Manual feed roller clutch CLT4 goes ON 4 Aligning switch S5 comes ON If the aligning switch goes OFF when the aligning roller starts rotating Bypass misfeed The bypass misfeed symbol is displayed 8A Copying cannot be started A 3 Insert key copy counter If the key
96. nit Lens switch Cutout section Cutout section Carriage 1 View as seen from the exit side Front side Carriage drive wire Exposure lamp 1550 OPTIGAL Thermofuse 1 Remove two screws Thermofuse Pd Teflon tube Rear side Thermofuse 7 3 7 1 Carriage 1 Remove the supply cable s harness clamp and disconnect one connector Harness clamp Carriage 1 Supply cable View as seen from the exit side 2 Move and align carriage 1 with the cutout sec tion of the frame then unhook the wire fixture each screws for the front and rear 3 Remove the power supply cable from the car riage 25 cable guide Cutout section Cutout section Carriage 1 View as seen from the exit side 1550 OPTIGAL Oct 1995 O TOSHIBA 4 Slanting the whole carriage 1 unit take it out upwards Note Be careful not allow the unit to get hitched by the wire 7 3 8 The same procedure applies for removing the front Carriage drive wire and rear wires 1 Remove the original glass top cover right side cover upper le
97. o make sure that manual exposure ad justment for 100 has been properly done 1 Make copies at 154 50 and 200 re production ratios respectively In the AJ mode if you press the ENERGY SAVER key copies will be made 2 If the image density is not appropriate for certain reproduction ratios perform manual exposure adjustments a b or c in Sec 2 4 for the inappropriate ratios E PRINT 4 Li 1 lt Li j L lt ad Ex Ex 0 o 78 COMP LG LT R LD gt LG 65 LT R ST R LD gt LT R 50 LD gt ST R ZOOM 129 LT R COMP NCC 200 23 N Hon 154 o 5 COMP Wy Digital key 200 9 2 1550 UNPACKING PROCEDURE 2 3 Automatic adjustment of auto exposure 50 100 154 and 200 Note Before performing automatic exposure adjustment check to make sure that manual exposure adjustment for 100 has been properly done 1 Make sure that AJ is shown on the dis 2 1550 UNPACKING PROCEDURE 18 wa wa play Place blank A3 sized or Ledger sized copy paper on the glass and set it against the original scale then close the original cover After keying in code 49 press the PRINT key and the automatic adjustment of auto exposure commences The car riage l
98. on of the arrow 5 Pull out one connector 6 Take out the developer unit from the proc ess unit Developer unit Lever Connector Note If the photoconductor is exposed to fluorescent light or external light for long time it may suffer from light caused fatigue So be sure to cover the process unit with for example a suitable cloth Oct 1995 TOSHIBA 18 3 1550 UNPACKING PROCEDURE 7 Push the hook located on each side of the developer unit with your fingers in the di rection of the arrows to disengage them and then remove the top cover Top cover 8 Pour in the developer material Note Before pouring in the developer ma terial be sure to shake the developer bottle fully 9 By rotating the magnetic roller check to make sure that the developer material is transported properly 10 Reinstall the top cover The two hooks should be securely latched Ap Make sure that the top cover is securely closed Also make sure that the rubber I of the side seals both sides 11 After placing the developer unit in the proc ess unit move down the lever on each side by 90 to fix the developer unit Be sure to insert the connector securely 12 Reinstall the proccess unit into the machine 1 screw Note Be sure not to install the toner car tridge at this time seal of the top cover is positioned outside UN 1550 UNPACKING PROCEDURE 18 4 Oct 1995
99. oner bag etc For the main charger LED erasing array discharge lamp etc refer to Chapter 9 G Gear Main blade Toner recovery auger Front side ee i Rear side ETAL ET LY EEE ENDER erre er VETTRE RASENS ESSENSEN G25 Recovery blade View with the drum main charger unit and developer unit removed G63 G76 Rear side Front side G Gear View with the drum removed Oct 1995 O TOSHIBA 11 1 1550 CLEANER 11 2 Explanation of Functions blade Main blade Scrapes the drum surface to remove the re sidual toner The main blade is pressed on the drum with fixed pressure by the pressure spring e Recovery blade Collects the toner scraped off by the main blade e Toner recovery auger Transports the toner scraped off to the toner bag on the rear side Toner recovery Recovery Drum auger blade e Toner full switch When the toner bag becomes full of recovered toner the toner recovery auger is forced to the front causing the toner full switch S10 to be turned on Toner full switch 1550 CLEANER 11 2 Oct 1995 TOSHIBA 11 3 Disassembly and Replacement 11 3 1 1 Remove the process unit Refer to para 9 3 1 Cleaner unit 2 Remove the drum when it is to be replaced Remove the developer unit Remove the main charger unit BDisengage the two claws to remove the mo tor cover Unlock th
100. oner to the developer unit The toner motor is driven by 2SC2873Y Logic PC board Q19 5 VSW 24V 24V A ANA Toner motor Q19 RN2401 2SC2873Y DG The and terminals of the motor winding is connected to 24V and pin 2 of Q19 respectively When 1 of 020 becomes L pin 2 of 019 also becomes L Acollector current flows from the 24V supply through the motor winding causing the motor to ro tate e When pin 1 of Q20 becomes pin 2 of Q19 also becomes causing the current flowing through the motor winding to flow to the 24V supply through D13 gt The current decreases with a time constant determined by the inductance and resistance of the winding gt causing the motor to stop 1550 DEVELOPER 10 10 Oct 1995 TOSHIBA 10 5 Auto Toner Sensor Circuit Brief description Functions of auto toner circuit Detects density of toner in developer material Density drops toner supply Detects that toner in toner cartridge has been used up toner empty e Configuration of auto toner circuit e Auto sensor Detects toner density Control section Control to maintain toner in developer at a constant specific density Toner motor Replenishes the toner in the developer unit Display unit Displays toner empty status Display unit 5 Arithmetic and control p ad Toner cartridge unit PWA LGC 99 FO Toner motor DA converter Control voltage signal
101. or is B 2 2 switched ON ON 1 The combination of phases to which the current E ON ON flows is switched g ON ON Motor rotates 1550 OPTICAL 7 18 Oct 1995 TOSHIBA 7 5 Exposure Control Circuit 1 Brief description The exposure control circuit is composed of the following four blocks D Lamp regulator 2 Automatic exposure sensor circuit 3 Arithmetic and control unit Impresses a voltage corresponding to the duty ratio of the EXP PWM signal upon the exposure lamp Generates an AES signal indicating the density of the original by sensing the light reflected by the surface of the document Determines the lamp voltage by computation on the basis of AES and K RTN signals etc and outputs the EXP PWM signal to the lamp regulator Note The ON OFF state of the exposure lamp is controlled by a special signal EXPON which is different from the EXP PWM signal Original Exposure lamp Automatic exposure sensor circuit PWA AES 140 AES signal EXP PWM signal regulator j Arithmetic and control unit PWA LGC GA UP DOWN key CPU Switching power supply ai 1 10 TMP96C141AFZ Zero cross signal EEPROM included IC9 10C68 P45V 4 Oct 1995 TOSHIBA 7 19 1550 OPTICAL exposure control circuit has the following two functions Manual
102. ow speed Print key Green lamp is turned ON 1550 OPERATION 4 2 Oct 1995 TOSHIBA 4 lateral single sheet copying 119 dNdId 110 044 1150 1954 88 6 891 MS dlSd 89 911 MS LIX3 LS 9 dS LAH 869 0 me S 0 HL LAH 51 ar 46 78 0 4 6486 1770 HLIN NOS G4 vl L 86 EST sre eor 0 MOO MO HLN NIVN 211 808 OF 6 8 Le HILIA NIVIN 1550 OPERATION Oct 1995 TOSHIBA 4 lateral two sheets copying 119 dndld 50 826 9670 90 0 110 033 96v 5 62 900 __ fl 191 484 leg 886 891 2 MS dLSd LEL 686 89 911 MS LIX3 SL LS 96 m dS LAH ds T HL LAH T 68 LEE 80 EAS 21 24 8 ESY 50 0 0 MO9 MO HLU NIVN 1911 207 HLIA NIVIN GL vk EL cht tt 9 0 1995 1550 OPERATION 4 2 4 Bypass feed copying 1 Insert paper in bypass feed guide Aligning switch S5 is turned ON Bypass feed indicator lights up Carriage 1 and carriage 2 move to the home position
103. rection in which the spring hanger on the front faces The charge wire should be placed se curely in the V grooves on the front and rear sides Dont allow the wire to kink Don t touch the wire with bare hand Replacing the cleaning pad 1 Remove the charge wire 2 2 Remove the LED erasing array 3 Move the cleaning pad to the rear side 4 4 Remove the pad holder snap from the shaft Notes 1 Oct 1995 O TOSHIBA When reassembling pay attention to the direction of the pad holder in which it faces When moved to the rear the pads 2 pcs should be obviously away from the wires Spring hanger Terminal cover Terminal base Rear side Shaft Rear side 1550 DRUM 9 3 6 Transfer separation chargers 1 Pull out the cassette 2 Remove the knob for the cleaning pad shaft 3 After opening the front cover remove the hook and then take out the entire unit Note When reinstalling the transfer separation charger be sure to fit it into the rear terminal guide Since the charger is pushed up by spring make sure that it moves up and down freely Replacing the charge wire Entire length 353 mm tungsten wire 0 06 mm dia Disengage the claw of the transfer entrance guide from the rear side Remove the front and rear terminal covers For the separation charger remove the sup porter in addition Note For replacing the cleaning p
104. rive from the main motor but the heater lamp does not rotate Both the upper and lower rollers are always pressed against each other by spring force while the upper unit is closed But when the upper unit is raised they are released from the pressure The copy paper which has finished being fixed is separated smoothly from the upper heat roller with the aid of the separation claws The temperature detection section functions to control the tempera ture of the upper roller by means of a thermistor and when it detects an abnormally high tempera ture the power supply to the heater lamp is shut off by means of a thermostat B Paper exit section The upper and lower exit rollers are rotated through gears by the drive from the fuser unit The copy paper which has finished the fixing process is smoothly exited onto the copy tray through the upper and lower exit rollers The paper exit switch functions to detect whether or not the copy paper is properly exited onto the copy tray 1550 FUSER 12 2 Oct 1995 TOSHIBA 12 3 Disassembly and Replacement 12 3 1 unit 1 Remove the left side cover lower 2 screws 2 Remove the inner cover lower left 1 screw 3 Remove one screw and disconnect three con nectors 4 Pull out the fuser unit toward the front Note The screw holding the fuser unit is tightened at the hole at the time of shipping from the factory However when tilting the fuser unit in order to
105. ront Carriage 1 drive Carriage 2 drive Carriage drive wire Rear Carriage 1 drive Carriage 2 drive Carriage drive wire Carriage drive wire View as seen from the rear View as seen from the front Feed side Exit side Wire fixing Scanning motor Fixed to CRG 1 15 2 Wire fixing 7 Shaft 2M 77 66 18 P Pulley View as seen from the rear Oct 1995 TOSHIBA 7 3 1550 OPTIGAL The scanning motor makes carriage 1 and 2 return s Home switch to their home positions which are detected by car EI riage 1 passing the home switch When the PRINT key is pressed the scanning motor causes carriage 1 and 2 to scan the original Rear side 7 2 2 Mirror motor and lens motor Mirror motor 2 G70 G10 Lens motor 1 Rack G18 View with the process unit and the stay removed and View as seen from the front the upper unit raised 1550 OPTICAL 7 4 Oct 1995 TOSHIBA Lens motor 1 Gear Teeth 70 Timing belt Gear Teeth 18 gt Pulley Teeth 16 4 gt Fixed to the belt Lens unit 2M 465 Lens switch Mirror motor 2 G gt Gear Teeth 70 Gear Teeth 10 gt Fixed to the rack Mirror unit Mirror switch G18 G70 P16 Mirror switch Lens motor 1 2M 465 Lens unit Lens switch CES View as se
106. stat K THMO Heater lamp HTR LAMP Damp heater U2 D HTR U2 1550 GENERAL 2 2 Symbol and Function of Electrical Parts 1 Motors Code name Go to DC Harness Connection Diagram Refer to SERVICE PARTS LIST ED 1550 Function Remarks Page item No MAIN MTR Main motor Drives the drum developer and heat roller IC motor 11 SCN MTR Scanning motor Scans the optical system Pulse motor P8 114 LNS MTR Lens motor Drives the lens unit Pulse motor P8 14 MRR MTR Mirror motor OPT FAN F Optics fan front OPT FAN R Optics fan rear Drives the mirror unit Cools the optical system Pulse motor IC motor 60 P8 l4 EXIT FAN Exit fan Cools the drum and cleaner IC motor 160 TNR MTR Toner motor 2 Electromagnetic spring clutches Code name Replenishes the toner Function Brush motor Remarks Page item No RGT1 CLT Aligning roller clutch Transmits aligning roller drive 7 4 FED1 CLT Feed roller clutch CLT3 PKLP CLT Pick up roller clutch 8 Counters Code name Transmits feed roller drive Transmits pick up roller drive Function P7 122 Remarks T CTR Total counter Total counter 6 digit K CTR Key copy counter Oct 1995 TOSHIBA Individual counter 6 digit option
107. t roller temperature with a thermistor and ON OFF controls the heater lamp Heat roller surface tem perature 180 thermistor resistance value 7 4 approx Reference Relationship between heat roller surface temperature and thermistor resistance value Temperature Thermistor resistance Heater lamp state Less than 180 C More than 7 4 ON 180 7 4 Maintains previous state More than 180 C Less than 7 4 KQ OFF Warming up Ready 180 C During copying 180 C C la pt lt 180 Heat roller temperature distribution 27 lamp OFF ON OFF OFFJONJOFF N ON OFF OFF 2 Thermistor disconnection detection Resistance value of thermistor changes Input voltage changes Input voltage can be obtained by dividing the pressure of R170 thermistor R27 and R29 main CPU detects the changes and judges whether the thermistor is normal or not 45V 26 R7 Thermistor 255 R170 IC10 5VO 4 C12 P35 BSAK R8 R27 RIS 77 13 DA converter R28 R29 M62353FP 06 77 1550 FUSER 12 10 Oct 1995 TOSHIBA 13 OPTIONAL PAPER FEEDING UNIT MY 1004 13 1 Specifications Model Name Paper feeding unit PFU MY 1004 Number of Cassette One Cassette Capacity 500 sheets 50mm or less Paper Size A3 A5 R Ledger Statement R
108. ter installing the drum apply patting power to the drum and rotate it Refer to Sec 11 3 1 11 3 3 Toner full switch 1 Disconnect a connector 2 Remove the switch 1550 CLEANER 11 Blade Collar Toner full switch Connector Oct 1995 O TOSHIBA 12 FUSER AND PAPER EXIT SECTION 12 1 Construction This section consists of the uppet heat roller cleaning felt roller paper exit roller unit separation claw unit thermistor thermostat lower heat roller cleaning blade heater lamp etc G Gear E Upper heat roller Front side Cleaning felt roller G19 G14 Rear side Heater lamp G60 G40 Separation claw unit Paper exit roller unit G40 View with the fuser guard removed Thermostat Thermistor Cleaning blade Lower heat roller View with the upper heat roller removed Oct 1995 TOSHIBA 12 1 1550 FUSER 12 2 Explanation of Operation Cleaning blade Cleaning felt roller Heater lamp Thermostat Thermistor Lower exit roller Lower heat roller Paper exit switch Separation claw Upper heat roller A Fuser unit This unit applies heat and pressure to the copy paper separated and transported from the drum to fix the toner image to the paper The upper and lower rollers are rotated under a fixed pressure pro vided by spring force by the drive from the main motor The upper roller has a heater lamp inside it and is rotated by the d
109. the copier 1 2 CST2 installation Tells the copier that PFU is installed The signal becomes L with PFU installed DR SW2 door switch Indicates whether or not the PFU s side cover is open When the cover is closed the door switch is turned on causing the signal to become L FED SW2 paper stop switch Indicates the status of the PFU s paper stop switch When there is paper on the paper stop switch it is turned on causing the signal to become H EMP SW2 paper empty switch Indicates whether or not there is paper in the PFU s cassette When there is paper the paper empty Switch is turned on causing the signal to become L 51213 10 Paper size switches Indicate the size of the cassette When the size mark plate pushes the switches the corresponding paper size signal becomes L 1550 OPTIONAL 18 20 Oct 1995 TOSHIBA 13 6 2 Driving the drive motor The drive motor M10 is driven by transistor Q1 as described below When the signal MOT ON 2 from the copier becomes L an L voltage is applied to the base of Q1 Q1 is turned on causing current to flow from 24V gt Q1 s emitter gt Q1 s collector R3 DG This will cause the drive motor PFU MOT to rotate When the 2 signal becomes Q1 is turned off shutting off the above current route But while the motor continues to rotate due to its inertia current also tries to continue to flow causing a voltage to be generated bet
110. tors and remove four Screws TM Connectors Oct 1995 O TOSHIBA 2 4 2 Removal and installation of electrical parts A Remove the control panel PWA F PNL PC board 1 Remove the control panel cover Refer to 2 4 1 H 2 Place the control panel cover upside down and remove its metal cover 6 screws Remove the earth screw of the shield Remove the counter connector 3 When you remove nine 9 screws the control panel PC board can be taken out along with the harness They can be separated if you disconnect two connectors Connector Note Be careful not to allow the ground wire of the shield to be cut Oct 1995 TOSHIBA 2 16 1550 GENERAL B Total counter 1 Remove the control panel cover 2 Place the control panel cover upside down and remove the two screws fastening the bracket 3 Remove one screw 4 Disconnect one connector Note Be careful not to allow the ground wire of the shield to be cut C Logic PC board PWA F LGC 1 Remove the rear cover 2 Disconnect connectors 10 pcs when no op tional equipment is used and 11 pcs when op tional equipment are used and take out the PC board from its four lock supports D Power supply unit 1 Remove the rear cover 2 Disconnect connectors 9 pcs 3 Remove four screws About bottom 4 connectors black harness must be connected L terminal that is de scr
111. trical parts excluding motors Name Control panel PC board PWA F PNL Total counter T CTR Feed roller clutch FED CLT Pick up roller clutch PKUP CLT Aligning roller clutch CLT REG High voltage transformer PS HVT Heat roller thermistor THMS HTR Exit switch EXT SW Logic PC board PWA F LGC Power supply unit PS ACC Size switch SIZE1 SW Paper empty switch EMP2 SW Aligning switch RGT SW Toner full switch T FUL SW Auto toner sensor SNR ATC Eraser lamp PC board ASM F ERS LED discharge array PC board ASM DCH Mirror switch MRR SW Auto exposure PC board PWA F AES Lens switch LNS SW Home switch HOME SW Oct 1995 TOSHIBA 2 3 1550 GENERAL Electrical parts such as motors 1550 GENERAL Name Main motor MAIN MTR Scanning motor SCN MTR Mirror motor MRR MTR Lens motor LNS MTR Front optics fan OPT FAN F Rear optics fan OPT FAN R Exit fan EXIT FAN Toner motor TNR MTR Oct 1995 O TOSHIBA AC electrical parts Oct 1995 O TOSHIBA Name Door switch DOOR SW Main switch MAIN SW Damp heater L D HTR L Thermostat power cable Fuse PC board PWA F FUS Damp heater U1 D HTR U1 Exposure lamp EXPO LAMP ay AJOJN Thermofuse FU EXPO Lamp regulator PC board PS LRG Heater thermo
112. tridge drive motor 1 screw and connector 10 3 6 Auto toner sensor 1 Pour out the developer material from the de veloper unit 2 Place the developer unit upside down and re move the auto toner sensor 1 screw and con nector 1550 DEVELOPER 10 Process unit cover Toner cartridge drive motor Connector Auto toner sensor Oct 1995 TOSHIBA 10 3 7 Magnetic roller 1 Pour out the developer unit from the developer unit Refer to para 10 3 3 2 Remove the front plate and the guide roller Refer to 10 3 4 Para Front side 3 Remove the adjustment plate rear plate and guide roller Refer to 10 3 4 Para Rear side 4 Remove the leveler 2 adjustment screws 2 coil springs and 2 plate springs 5 Remove the sleeve drive pulley gear and belt 6 Peel off the seal on the front and take out the magnetic roller bearing After removing the magnetic roller from the frame slit move the magnetic roller in the direction of the arrow and take it out toward you Note After reassembly the doctor to sleeve gap and the pole position should be adjusted Oct 1995 TOSHIBA 10 Adjustment screw and two springs Adjustment screw and two springs Belt Gear Sleeve drive pulley Magnetic roller bearing Seal 1550 DEVELOPER 10 4 Brush Motor Drive 9 The toner motor is provided to supply t
113. turning it Remove the carriage fastening screw lo cated in the left top cover Lifting bands Coin screw 1550 UNPACKING PROCEDURE 6 Open the front cover e Open the front cover and raise the upper unit 7 Install the fuser unit lever caps 2 The lever caps are provided in the acces sory package e Securely fit the lever caps onto front and rear levers Install the fuser unit lever cap paying particular attention to the orientation Make sure the hook portion of the cap is firmly inserted in the window of the arm The C face of two caps on both sides front and receiving tray rear must be installed toward the front side Caution If the installation is not perfect the PUSHR FUSER pushing the cap may come off the duct B Set up Procedure 1 Installing the copy receiving tray Install the copy receiving tray by fitting it into the holes in the left side cover 1550 UNPACKING PROCEDURE 18 20 July 1996 TOSHIBA 2 Setting the developer unit 1 Remove the part fastening the lens unit from the machine Push it to the rear side and lower it si multaneously to remove it 2 Take out the process unit 1 screw 3 Remove the developer unit spacer from the process unit 4 Place the process unit on a flat surface Raise the lever located on each side of the process unit in the directi
114. u 7 G25 77621680 AN G20 G23 G25 Nf 5 020775 IN Developer ___ o Laie G63 Tm gear Heat roller y AG drive gear AC s Dy GEN Y Ne T G30 Feed ES G40 G20 Pick up G40 01 For eru Aligning roller lower mo c c ne age gt Nx ux G18 G24 Transport roller for PFU a ME 1 ET All parts except the main motor are located inside the frames Dirve mechanism as seen from the rear 1550 DRIVE Upper Unit Drive The horizontal bar indicates the same shaft DRIVE D L Main motor No of gear teeth 10 No of gear No of gear teeth 75 teeth 20 DRIVE D D No of gear teeth 20 No of gear No of gear teeth 30 teeth 21 No of gear No of gear of gear teeth 25 teeth 40 teeth 24 No of gear No of gear No of gear _ Drum 60 of gear letes teeth 63 teeth 76 A 15 No of gear No of gear No of gear No of pulley uger teeth 25 teeth 20 teeth 33 teeth 20 Belt 2M No of gear No of pulley teein 33 teeth 28 Mg roller 020 1550 DRIVE Lower Unit Drive The horizont
115. ustment mode vertical reproduction only can be altered to 1 1 01 Reduction Enlargement 50 65 78 129 154 200 0 5 50 71 82 122 141 200 For Europe Paper feeding Type Capacity Cassette Front Loading 500 sheets 50 mm or less Manual start Atthe time of shipping the copying operation is started by the PRINT key By inputting data for adjustment mode it can be changed to auto start Toner supply Automatic density detection and replenishment Toner cartridge replacement method Exposure Automatic control and manual control Weight 35 kg Power source 110 V 50 60 Hz 115V 60 Hz 127 60 Hz 220 V 50 60 Hz 220 240 V 50 60 Hz Power consumption 1 5 KW or less Total counter Mechanical total counter 6 digits Machine size See the next page 1550 SPECIFICATIONS 1 2 Oct 1995 TOSHIBA 548 541 mm 340 1995 1 3 1550 SPECIFICATIONS 1 2 Accessories Copy receiving tray 1 pc Operator s manual 1 pc Drum icti ded 1 pc Lever 2 pcs Setup report 1 pc 1 3 Options and Supplies Options Automatic document feeder MR 2004LT 660 84890 MR 2004A4 660 84891 Sorter MG 1003 660 84838 Key copy counter 6 digit MU
116. ver upper 1 screw 2 2 Disconnect three connectors front 3 Remove the duct cover 1 screw 4 4 Separate the exit fan from the cover 1 con nector I Front optics fan front 1 Remove the inner cover 2 Disconnect one connector 3 Remove two screws 1550 GENERAL Screws Size switch Duct cover Exit fan Optics fan front DG A nla Mis 1208 19 1995 J Fuse PWA F FUS 140 1 Remove the rear cover 2 Replace the fuse K Fuse PC board PWA F FUS 140 1 Disconnect one connector 2 Remove one screw 3 Remove the fuse PC board with the bracket Main motor 1 Disconnect two connectors 2 Remove two screws Oct 1995 TOSHIBA S SANT PN Ne PWA F FUS 140 1 20 1550 GENERAL Lamp regulator PC board PS LRG 1 Remove the top cover 2 Disconnect two connectors and remove the PC board from three lock supports PS LRG N Optics fan rear 1 Remove the top cover Remove the connector from the sorter two Screws 2 Disconnect one connector 3 Remove two screws 1550 GENERAL 2 21 Oct 1995 TOSHIBA 3 COPYING PROCESS Copying Process Document exposure 3 1 LED Halogen lamp 300 W 691 5 V Discharge lamp
117. ween the input and output terminals of the motor Since this voltage is applied between the anode and cathode of D1 the inverse electromotive voltage occurring in the motor is short circuited and restricted 24V 24V R1 R1 ap a YI a R2 MOT ON2 R2 o e A D1 mo 1 01 9 DG DG Current route while the motor is turned on Current route while the motor is turned off 1 The MOT ON2 signal is to cause the motor PFU MOT M10 to rotate and is supplied by the copier When this signal becomes L the motor starts rotating Oct 1995 O TOSHIBA 13 21 1550 OPTIONAL 14 ELECTRIC CIRCUIT DIAGRAM 14 1 Logic Circuit PWA F LGC 1 8 Oct 1995 TOSHIBA 1 ACKB S SRXD STXD ACKB DF DFRXD DFTXD 5VCHK REQ DF zc S REQ DFACK SACK MOT FG DF REQ MRR D MRR C MRR B MRR A LNS D LNS C LNS B LNS A SCN D SCN C SCN B SCN A AES VIN ATSVIN DRM THM 1 RST 2 5 SRXD STXD HINT How to search for where uns 1 10W4700 1 1084700 1 10W4700 ie 1 1084700 ie 1 10W4700 1 10 4700 1 21 10W4700 272 2 1 10W4700 7407M 2 34 R87 Ege 1 10W22K IC14 NE 33 ACKB DF DFRXD DFTXD 5VCHK REQ DF 2 7407 4 3 32
118. wer it to remove e Remove the rear cover and disconnect one connector from the logic PC board Take the connector out through the window in the rear frame to the front side Oct 1995 TOSHIBA 8 9 1550 FEEDER e After pulling out the whole unit to the front side remove one claw and raising the switch dis connect the connector Empty switch Note When reassembling the rail unit make sure that the holder bottle is placed on the rail Holder bottle 1550 FEEDER 8 10 Oct 1995 O TOSHIBA Pick up roller Grips feed roller Pick up roller clutch Lower paper feeder unit placed upside down Feed roller clutch Pick up roller and feed roller Snap off the grips and pull out each roller from its shaft Note that the pick up roller and the feed roller are the same parts Pick up roller clutch and feed roller clutch one claw to remove the clutch cover While lifting each shaft in the direction of the arrow remove each clutch from the shaft holder Disconnect the connector from the bracket Removing one setscrew allows the clutch and the shaft to be separated e pick up roller clutch and the feed roller clutch are the same parts July 1996 TOSHIBA 8 118 Clutch cover Setscrews 1550 FEEDER 9 DRUM RELATED SECTION 9 1 Construction

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