panasonic JU-475 5inch floppy diskette drive
Contents
1. 7 9 1 Motor Speed Verification Index Period 7 9 2 Write Prot ct Verific atioN 0 Soka d ee kaa ul eS 7 9 3 Head Output Verification eg ata e AS kallati AS Se tee we 7 9 4 Output Modulation Verification 8 9 5 Resolution Verification E A S kka ts a EE 8 9 6 Radial Alignment Verification and Adjustment 8 97 Az im th Verification EE EE 9 9 8 Index Burst Verification and Adjustment 10 9 9 Track 0 Sensor Adj stment 33 LA ARA E gs A t ll 10 9 10 Asymmetry TT NEE EE 11 TESTPOI NTS unir A TS 12 PANASONIC ALIGNMENT DISKETTE 13 PART Il REMOVALS AND INSTALLATIONS 14 12 1 PCB Removal and installation 14 12 2 Front Plate and Handle Removal and Installation 14 12 3 Track 0 Sensor Removal and Installation 15 12 4 Collet Assembly Removal Installation and Adjustment 15 12 5 Clamp Assembly Removal and Installation 16 12 6 Write Protect Sensor Assembly and Index S2. 12 8 1 2 3 4 5 Stepper Motor Assembly Removal and Installation Remove the head carriage assembly as described in section 12 9 Remove the two stepper motor assembly mounting screws Remove the stepper motor and stepper motor stopper Reverse the above procedure to reinstallation After reinstallation adjust the radial alignment and track 0 sensor as described in section 9 6 and 9 9 Stepper Motor Assembly Stepper Motor Stopper Fig 12 8 Stepper Motor Assembly Removal 18 12 9 Head Carriage Assembly Removal and Installation 1 Remove the PCB as described in section 12 1 2 Remove the one pig tail clamp mounting screw 3 Remove the two guide rod clamp mounting screws 4 Remove the head carriage assembly guide rod clamp guide rod and pig tail clamp 5 Pull out the guide rod from the head carriage assembly 6 Reverse the above procedure to reinstall 7 After reinstallation adjust the radial alignment and track 0 sensor as described in section 9 6 and 9 9 Head Carriage Assembly Guide Rod Clamp Fig 12 9 Head Carriage Assembly Removal Pig tail leading Pig Tail Clamp 1 Pass the pig tail through the pig tail clamp See Fig 12 9 1 2 Locate the side 0 to the outer side and side 1 to the inner side provide a clearance of 1mm between them and place them parallel to each other Avoid twisting or closing 3 Fig 12 9 2 When the carriage is on
3. 6 Insert Panasonic alignment diskette CAUTION Be sure to leave the alignment diskette under room conditions for 20 minutes before adjustment Step to the track specified in the radial alignment column of Table 8 1 Leave the oscilloscope in the same condition as mentioned in section 9 3 Cats Eve Svstem Check the output waveforms for sides O and 1 They should appear as in Fig 9 2 The two waveforms should appear in the amplitude ratio in the radial alignment column of Table 8 1 or better If the specified ratio is not satisfied loosen the two mounting screws for the stepper motor 7 Move the stepper motor along the base by hand until the two waveforms assume approximately the same amplitude and retighten the mounting screws See Fig 9 2 8 Step the head outward track 0 and inward track 79 and confirm that the adjustment has been completed 9 After the radial adjustment be sure to confirm track 0 sensor adjustment as described in section 9 9 Note Alignments on sides 0 and 1 are adjusted at the factory If they are misaligned adjust them to meet the specifications of Table 8 1 Mounting screws when A gt B x 100 whenA lt B E x 100 KEPT E NET SE Fig 9 2 Radial Alignment Waveforms CATS EYE Fig 9 2 1 Stepper Motor Mounting Screws 9 7 Azimuth Verification 1 Insert an alignment diskette Seek to the track specified in the azimuth column of Table 8 1 2
4. Panasonic e 10 11 12 13 14 15 16 97 18 CONTENTS PARTI Page INTRODUCTION Vase a athe aan Sb seg Ses E wale NEE EEN 1 MODELS AND MODEL NUMBERS 1 2 1 5 25 i eh FDD SONGS cu usu auasi e d AS we S la ete ea a 1 SPECIAL TOOLS zs siksnu d a d eer AS e a a ones eens 1 OUTLINE OF MAINTENANCE o comio os EENS e as bie else Wie der seista ec NB 2 4 1 e Eu E EE H 4 2 Ex ercis a bis cet A dd aa eet dee is E sets 2 DIAGNOSTICPROCED RES 53 vi AEN sar ieti ENN EEN ses valele TEEN ER ote Gwe NEE VE ed ete 2 5 1 Error Symptom Recognition 2 5 2 Soft Error Detection and Correction 2 5 3 Vd sins dd as 2 5 4 o ayapa au aS un ia Aan akt a maa a Yu 3 5 5 SEEK ETOL aa Ee A a da de a 3 5 6 Interchangeability EFFOL uses eta kaa indica seca ata u qaq al K bs 3 TROUBLE ANALYSIS 5 son item cara AA EE EELER KENE EE ES 3 6 1 Trouble Analysis Procedure 3 6 2 Troubleshooting Flow Chart 4 6 3 Trouble Analysis Table C os akt kadi ae EAR 5 PREVENTIVE MAINTENANCE i uuu u s sa ER e Bio a dere dee Se eet e ra de 6 SPECIFICATIONS iu REENEN SEN ia ole bce Ne E ee er AE Gre Ree EE ert 6 ADJUSTMENTS AND VERIFICATIONS
5. RSO eee 5V con Ka 39K 39K R52 1 8K R2 F RRITE 820 R w1 Y SVDC gt 5V Le cool te C13 R49 C110 022U dr S3y 25v ERASE Y 0 01 Z 390P 8 2K C7 820P SS T ae GND TPM T C12 0 0229 5V RETURN ne yi DT N Lol MAIS L4 LS l SE SIDE1 Ben 2 e DAIS TEOR 1801H 12V RETURN 22 con zb CA a gt R w 1 70 Ee R47 100p R48 D Ba R13 12V DC gt 12V a D nn Ku 470 470 3 3K jp L3 NOISE ERASE Y TIT 2209 ei E re a SUPRESSION COILE GND 712 EH E C17 Ci6 o 022y Jeu E ES wpe D1 HA151WK 0 10 0 022 C9 35K144 I m ZB vuan SVA 36 as 3 5V ch e UN2211 1 Rg un2211 3 9K aa Iso 95 FIO T 235 46 ds AS DRIVE SELECT 1 D C sama kr TIERRAS Par e RSS qa 12 DS2 s A DGND1 TP DRIVE SELECT 2 aces PILIS 1K DRIVE SELECT 3 253 1O y GALA sm 2 5 gp spsal5 gf ZAA WMS sos e A DRIVE SELECT 4 J U RS NTRACKS 26 TRACK DB D2 HA122 03 MA122 PZ sa 28 03 UN2212 eu D NRDDT READ DATA IZA 2 WEEN u MODE SELECT ZA 39K Steier KD 5V 2 GLAS NDMACT gt al en Z IC 1 MOSO sl SV 2 219 RPI 5V g Ny D D MOTOR 6 5 R15 3 9K SE SE BP E TEM ey m L DIRECTI N SELECT 8 DIRSEL C34 5 874 sa LLL eel radu SE J s a NSTPACT Si PS sua Y 24 DAR ES 1 E STEP MOTOR WRITE GATE NWRGT NSD1 Y x 2 Ee KA USO 1 El DE SE oea tino s j ss Y 4 SERE A MEE IN USE HEAD LOAD ee G DEE NLOWMD R24 44 330 2 c ME my R T IN USE LED L7 334H S Te ag W
6. disassembly and reassembly procedures parts list and PCB circuits Part encompasses maintenance instructions for all Floppy Disk Drive FDD models Refer to the highlighted applicable items and perform maintenance work on the FDD Note Thisservice manuals is prepared for maintenance of the FDD Do not use this manual for judging pass or fail criteria in inspections MODELS AND MODEL NUMBERS 5 25inch FDD Series 48TPI JA 551 L we 96TPI JA 560 JA 561 JU 581 JU 585 SPECIAL TOOLS The following special tools are used for FDD maintenance Table3 1 Special Tools Part No Tool 5 25 inch 48TPI E Quantity JA 551 JU 455 JA 561 JU 465 Alignment diskette 817 128 817560 Oscilloscope 50 MHz aa Probe to t pp Note Stand for the same as left 4 OUTLINE OF MAINTENANCE 4 1 4 2 5 2 5 3 The following tools are reguired for maintenance of an FDD Alignment Diskette Alignment diskette is used for head actuator alignment and index sensor adjustment Use the right diskette as shown in Table 8 1 Exerciser The exerciser enables you to make all adjustments and inspections necessary for an FDD Its functions include the following 1 Seek increment or alternate tracks 2 Read but no data compare 3 Write 1F or 2F All 0 s or 1 s 4 Head load 5 25inch FDD with optional head loader 5 Recalibration to track 0 The exerciser has switch
7. outthe pins of the media sensor assembly 4 Reverse the above procedure to reinstall from the following locations on the J3 connector N08 10 12 At that time draw out the pins with lifting the stopper on the connector Remove the media sensor assembly mounting screw and take out the media sensor assembly 5 Reverse the above procedure to reinstall Media Lifter Spring See 4 Cartridge Guide Media Sensor Lifter Shaft Lead Pin Lead Hole Retaining Ring Fig 12 13 Media Lifter Removal Fig 12 14 Media Sensor Assembly Removal 22 13 EXPLODED VIEW JU 475 4AGG PULA Va RZM li TS Caution For transportation insert the dummy diskette in the drive unit and close the lever Remove the dummy diskette before use of the drive unit 223 14 REPLACEMENT PARTS LIST MODEL JU 475 4AGG PCB Assembly Stepper Motor Faston LED 5 Clamp For Guide Rod Stepper Motor Stopper 7 Shield Plate Guide Rod Front Panel Clamp Handle 1 Head Carriage Assembly YTUF47HD4 M Track 0 Assembly Screw For Guide Rod Clamp 4 Screw For Stepper Motor 5 XSB3 6FX Screw PCB Assembly 1 Faston 1 Front Plate 2 Drive Motor 3 Pig Tail Clamp 1 Shield Plate 2 Cartridge Guide 4 Clamp Bearing A 2 Media Sensor 1 TF1E00310B4 Screw For Shield Plate TF1E00300B4 Screw For Track 0 Sensor Index Sensor TF3L12930B2 Base rive Motor FMD01732B4T 20 Pig T
8. the outer most track a When the head carriage is on the outer most track lead the side 0 and side 1 along line A on the pig tail clamp b Ensure that the pig tail does not come in contact with the inner wall of the base Contacting of the pig tail is allowable if the side 0 and side 1 are not overlapped each other vertically 4 Fig 12 9 2 When the carriage is on the inner most track Fig 12 9 1 Mounting ofthe Pig Tail Clamp a When the head carriage is on the inner most track lead the side 0 and side 1 along line B on the pig tail clamp 5 Provide a clearance of about 1mm between the side 0 and side 1 6 Ensure that there is not excessive load or protrusion at the outlet for the pig tail in the head carriage 7 Fasten the pig tail clamp with screw 8 Do not pull the pig tail by a force more than 500g after it has been clamped U 9 Pull the pig tail lightly to ensure that it does not move 19 12 10 Drive Motor Removal and Installation When the carriage is on an outer most track 1 Remove the cartridge guide assembly as described in section 12 7 2 Remove the three drive motor mounting screws and take off the drive motor from the base 3 Reverse the above procedure to reinstall 4 After reinstallation the adjustments necessary upon reinstallation of the cartridge guide as Provide a clearance of about 1 described in section 12 7 mm between the Side 0 and Side 1 approximately wit
9. 0 eea A MCH215C102KK Chipcapacitor 1 LL C11 12 Chip Capacitor WE EN m C13 MCH215A39UK ChipCapacitor CT 1 LI c14 MCH215A101JK_ ChipCapacitor Ai O C15 16 MCH215F2237k ChipCapacitor Zz C17 MCH212F104ZK__ ChipCapacitor 1 JL C20 21 e FCCOO330B103 ChipCapacitor____ gt _____JY 2 C25 26 mcH212F104zk CchipCapacitor_____ 2 C27 e ECEA1EKS330E ElectrolyteCapacitor o J 1 C28 MmcH212F104zk chipCapacitor____ 1 JL C29 gt ECEA1EKS330E ElectrolyteCapacitor____ 1 C30 ST MCH212F1042K_ ChipCapacitor LI T C31 ECEA1EKS330E ElectrolyteCapacitor__ 1 o C32 SS MCH215F103ZK__ Chip Capacitor ss O 1 LI LI C34 aaa MCH212F1047k IChipCapacitor LL LI LI Di MAISIWK TX Diode CT LI D2 3 ZA MA122 1X JDiode Uz j D4 MAI21 TX Diode LL D8 9 DAii6T9 Diode OC j D12 13 Iva rr Leger 2 IC FOl01280B4 JILL 2 IC2 JHA13421PMP Io or 2 Block Resistor E sd eee Wa A PE s E m asss so po Kk E J j RS DEER asa S 1 j ae ee KEE TTH A 0 AR ee WET SSK A AKMENE T TE GI 1 325 REPLACEMENT PARTS LIST FOR PCB 2 MODEL JU 475 4AGG Part Name 8 Description XN4212 TX Transistor TI 3SK144 TX_ Transistor 1 EN EE Ref No Remarks 05 8 Chip Resistor ERJ6GEYJ392V IChipResistor LL ERJ6GEYG392V ChipResitor LI 1 _ N tO ERJ6
10. 60 rpm Parameter 1 indexperiod Output level 3 Modulation 5 5 Radial Alignment 6 Azimuth Index burst 9 Asymmetry Head load time MINI B type Drive motor is fixed speed type 360 rpm Parameter 1 indexperiod 2 Outputlevel ze Modulation 4 Resolution Radial Alignment 6 Azimuth Index burst E 9 Asymmetry Head load time x 9 9 1 9 2 9 3 ADJUSTMENTS AND VERIFICATIONS Motor Speed Verification Index Period 1 Insert a diskette run the motor and clamp Refer to the index period column of Table 8 1 2 Step to the specified track 3 Connect a frequency counter to the INDEX signal TP7 4 Check that the freguency counter readings meet the specifications of Table 8 1 Write Protect Verification 1 Check that the exerciser s write protect lamp goes on and off as a diskette is inserted and removed as specified in the table below Diskette with write protect Diskette with write protect hole open hole closed Not write protected write protected Head Output Verification Use anew diskette if possible to identify head failure for this check 1 Insert a good diskette 2 Runthe motor 3 Step to the track specified in the output level column of Table 8 1 4 Connect the oscilloscope probe as specified below Invert channel 2 and select the Add mode Set vertical deflection to 10 mV division and
11. D bv sLv AA INVYUOVIG ADO SL Matsushita Communication Industrial Co Ltd Memory Systems Division
12. ES Recal SW On Track 0 Lamp Lights at Track 0 YES Head Load Operation OK YES When Head Load option 6 2 Troubleshooting Flow Chart Table6 1 Troubleshooting Flow Chart Set Address SW to Track 79 NO Diskette k Defective Seek Operation OK YES YES Controller Write SW On Defective Write Waveform on Oscilloscope OK YES Write SW Off Read Waveform on Oscilloscope OK YES NO NO OK after head cleaning Check item 1 Table 6 2 YES Check Item 2 FDD online test Table 6 2 NO Read Error CRC Error NO FDD IN USE LED Lights NO Check Item 3 Table 6 2 YES Write Protect Lamp Lights NO Check Item 4 Table 6 2 YES END NO NO NO YES NO NO Check Item 5 Table 6 2 Check Item 6 Table 6 2 Check Item 7 Table 6 2 Check Item 8 Table 6 2 Check item 9 Table 6 2 Check Item 10 Table 6 2 6 3 Trouble Analysis Table 1 Table 6 2 Trouble Analysis ee woe Index detection failure Collet part faulty Drive motor control PCB Drive motor fault ndex LED faulty ndex detector fault ndex LED index detector installation faulty PCB motor on circuit PCB index detection circuit LA UO 34pin signal failure 1 Track 0 detection failure No head loading 7 5 I Read error PCB disk change ready Media in Media ou
13. GEYG512V ChipResistor II ERJ6GEYJ392V_ ChipResistor LI i SE ie ri isej ERJGGEYJ104V ChipResister ERJ6GEYJ163V ChipResister 3 ERJGGEYJ822V ChipResister ERJGGEYJ821V ChipResister OOO 1 ERJGGEYJ392V ChipResistor A 1 ERJ6GGEYJ331V _ ChipResstor r FRA00100B151 Chip Resistor LZ ERJ6GEYG363V___ Chip besietor LJ ERJ6GEYG203V__ Chip Resistor Jr ld eebe Dees EA Ela dl EE ISK WEF K TES HDIDI IDII D DIDID D DD l NININININININ Lech fu or for Lesch a O OO UA nN _ 100 io iu 10 NO A 1 N No a CH Chip Resistor Chip Resistor ERJ6GEYG363V R37 39 3 1 1 1 2 1 1 1 1 1 3 1 R41 42 R43 C II o WS Fe oon 45 ERJGGEYJ104V ChipResistor LI 1 ERJ6GEYOROOV Chip Resistor 1 R47 48 ERJ6GEYJ471V ChipResistor LI 2 R49 ERJ6GEYJ822V JChipResistor LL R50 51 Chip Resistor C EE R52 53 ERJ6GGEYJ182V ChipResstor 2 ERJ6GEYJ221V _ ChipResstor II i ld Tha C t ip Resi 1 ip Resi EZ SE MEN i E waspi i EC DEES a ee EP A GT A PRE AI R54 R55 R57 R59 60 R62 63 VR1 LEEO GC3205c4 IResonato gt 0 gt gt a e w 100 EA Ia Go Cv Go Za 0 ajaja lu NI gt lO A 26 16 SCHEMATIC DIAGRAM JU 475 4AGG TPS SIDED R w 2 7
14. RITE PROTECT PC E MASIA WRITE PROTECT PE est INDEX PE INDEX PC OS MA151A AEN NOTES TRACK 00 PC R37 dolar o R61 4 7 ALLE RRCD OE 5V GEES o NOT INST D TRACK 06 LA sl az KEE BEI 1Kax6 Oil A XTAL MEDIA SENS R PC alo s MEDIA SENS R PE t a HA gt lt x R36 ROY MEDIA SENS R LA Su z SIE d NE sel z SE al wl Gu R63 e x x x 3 9K A BIR 27 17 CIRCUIT BOARD JU 475 4AGG Component Side Top NTP SM ra H FOL0128084 R17 B J6 BX FPK04162B3 T T R26 R25 CL Lt cC 5VDC Ll V lt md TP6 Fl T U ELI L AST r PHNH IM R TP Hp ST Dz 2 L Je R60 E JT e 6 14 12 11 AE 28 CIRCUIT BOARD JU 475 4AGG Solder Side Bottom 29 FPK04162B3 A NTP S70 T 0E MEDIA TRACK 00 WRITE STEPPER ACTIVITY HEAD DETECTOR DETECTOR PROTECT MOTOR LED LOAD DETECTOR f OPTION K st VI a E D D MOTOR WA lt ME i va INDEX DETECTOR Miliz t vn RERE B hal zizjz ZI I F Ammim 5 ai lai i xjzizizi olojo gt gt gt m g lt j j silsig S ss asa SS ki ziziz OOO O aga al 2 rs peles vij Led besi bes gt A A J N SALT W DRIVE SELECT 4 6 INDEX HEAD Side 0 JL ORIVE SELECT 2 2 Ga i EE TO HOST SSRN d SIGNALI eer ERASE a LES PAT eT RW 2 radit AL M HEAD Side 1 TO HOST POWER SUPPLY 1 33 odd number SIGNAL GN
15. Refer to Adjustments and Confirmation section 9 6 2 Head output too low Refer to Confirmation section 9 3 3 Motor speed difference Refer to Adjustments and Confirmation section 9 1 4 Formatincompatibility TROUBLE ANALYSIS To determine the cause of trouble whether it lies in the FDD diskette or controller replace the diskette and the FDD with good ones If the FDD is assumed faulty as a result follow the procedure below l Trouble Analysis Procedure FDD trouble may occur in any of the following ten forms 1 Index detection failure 2 I O 34pin signal failure Disk Change Ready Media In Media Out 3 Track 0 undetectable 4 Noseek 5 No write 6 Noread 7 Read error 8 IN USE LED won t light 9 Write protect undetectable 10 No head load 5 25inch FDD with optional head loader Check with the troubleshooting flowchart in section 6 2 CAUTION Be sure to switch the power off before removing an FDD or PCB from the operating system START Problem Remains the Same after Replacing with Good Diskette YES Problem Remains the Same after Replacing with Good FDD NO Run the operating system and check Record all diagnostic information on tracks and sectors as far as the program permits install Exerciser on FDD Power SW DCSW On Drive Select SW Head load SW On Index Lamp Flashes YES VO 34pin signal output OK Y
16. Set the oscilloscope in the same conditions as in section 9 3 and set horizontal deflection to 0 5 ms division 3 Measure as shown below 4 Confirm that the measured value meets the specifications in the azimuth column of Table 8 1 C D WhenB C When B gt C When B lt C Azimuth 0 Azimuth B C x A Azimuth EB x A B D C A A 12 Fig 9 4 Azimuth Waveforms 9 8 Index Burst Verification and Adjustment 1 Insert an alignment diskette Seek to the track specified in the index burst column of Table 8 1 2 Set the oscilloscope in the same conditions as in section 9 7 and set horizontal deflection to 50us division 3 Check that the time from oscilloscope start to the first data meets the index burst specifications of Table 8 1 4 Ifthe specifications are not met adjust as follows e Loosen the index detector mounting screws enough to free the assembly e Adjust the timing to meet the specifications of Table 8 1 e Retighten the screw e Check the timing again dee Fig 9 5 1 Index Detector 9 9 Track 0 Sensor Adjustment ae 1 Setthe oscilloscope as follows TRIG SYNC VERT HORIZ 2 Step between specified tracks at in the track 0 item of Table 8 1 Turn the seek delay switch on the exerciser to adjust 3 ms seek A 3 Loosen the track 0 sensor screw and adjust until the waveform on the oscilloscope appears as shown in Fig 9 6 EF Ze ed SAIA Mounting screw Fig 9 6 T
17. ail Clamp 22 LED Holder Assembly 23 Lifter Media Lifter Lift Shaft Clamp Cam Assembly 7 LiftSpring Media Lift Spring Collet Assembly 0 Write Protect Sensor Retaining Ring AUCH Retaining Ring ock Cam 333D4662477 ock Spring ad A Cartridge Guide Clamp Bearing B Clamp Bearing A Pad B Index Sensor Media Sensor 4 Dummy Diskette RSP Recommend Service Parts per 1 000 Units Caution 1 PCB assembly with mark NLA is no longer available after production discontinuation of the complete set 2 When you order the aforementioned parts be sure to specify Part No of the parts ordered mad lt 17 lt N N gn A O gt nm LA 32 33 34 3 LA KU V N SIN IO O 00 Q 3 3 3 3 g Ko 1 5 6 7 2 24 15 REPLACEMENT PARTS LIST FOR PCB 1 MODEL JU 475 4AGG ECEA1EKS330E ECEA1EKS330E Electrolyte Capacitor SR585F105Z 1 1 1 Block Resistor FJC00450B401 FJC01210B4 08052539 SFC24050202 Choke Coil NL322522 181 Choke Coil i NL322522 680 mem i FS SSS KESKSE IEEE i EA So C4 oe MCH215F1037k JChipCapacitor 1 LL CR ECEAJEKS330E ElectrolyteCapacitor____ 1 CG e mcH212F1047k ChipCapacitor_________ 1 LI C7 8 rccoo320B821 Chip Capacitor _ dJ 2 CH Z MCH2154271JK Chipcapacitr 1 C1
18. bly into the much in the PCB Fig 12 1 2 Cable Leading 12 2 Front Plate and Handle Removal and Installation 1 Operate the lock cam of the clamp assembly and turn the clamp handle in the direction of clamping 2 Remove the clamp handle 3 Remove the two front plate mounting screws and take off the front plate 4 Reverse the above procedure to reinstall Lock Cam Fig 12 1 PCB Removal Clamp Handle Fig 12 2 Front Plate and Handle Removal 14 12 3 1 2 3 4 5 6 Track 0 Sensor Assembly Removal and Installation Remove the shield plate as described in section 12 1 step 1 Disconnect the J3 connector from PCB Draw out the pins the track 0 sensor assembly from the following locations on the J3 connector No2 4 6 At that time draw out the pins with lifting the stopper on the connector Remove the track 0 sensor assembly mounting screw and take outthe track 0 sensor assembly Reverse the above procedure to reinstall After reinstallation adjust the track 0 sensor as described in section 9 9 Track 0 Blue Track 0 White Track 0 Yellow Stopper t Fig 12 3 Track 0 Sensor Assembly Removal 15 12 4 Collet Assembly Removal Installation and Adjustment 1 Remove the cartridge guide assembly as described in section 12 7 2 Remove the lifter unit as described in section 12 12 3 Remove the collet assembly from the guid
19. e shaft 4 Reverse the above procedure to reinstall 5 After reinstallation perform collet assembly center adjustment 6 Collet assembly center adjustment a Temporarily fasten the cartridge guide assembly b Insert a diskette or dummy diskette and clamp it c Clamp repeatedly a few times to find a good fit between the collet and the inside diameter of the drive motor d Bind the screws of the cartridge guide e Check step c again if not good repeat step a through d until the correct center adjustment is achieved Collet Assembly Fig 12 4 Collet Assembly Removal 12 5 1 2 3 4 Clamp Assembly Removal and Installation Remove the front plate as described in section 12 2 Remove the shield plate as described in section 12 1 step 1 Remove the two clamp assembly mounting screws and take out the clamp assembly Reverse the above procedure to reinstall Clamp Assembly Fig 12 5 Clamp Assembly Removal 16 12 6 1 et 2 3 4 5 6 7 8 Write Protect Sensor Assembly and Index Sensor Assembly Removal and Installation Remove the shield plate as described in section 12 1 step 1 Disconnect the J3 connector from PCB Draw out the pins of the write protect sensor assembly from the following locations on the J3 connector No9 11 Atthat time draw out the pins with lifting the stopper on the connector Draw out the pins of the index sensor assembl
20. ensor Assembly Removal and Installation 16 12 7 Cartridge Guide Assembly Removal and Installation 17 12 8 Stepper Motor Assembly Removal and Installation 18 12 9 Head Carriage Assembly Removal and Installation 18 19 12 10 Drive Motor Removal and Installation lacing NT a 20 12 11 LED Assembly Removal and Installation 21 12 12 Lifter Unit Removal and Installation 21 12 13 Media Lifter Removal and Installation 22 12 14 Media Sensor Assembly Removal and Installation 22 EXPEODED VIEW sii uuu RER KENE ide poe KEE NENNEN ENN E NEEN cine ae see clad de dE ewe eg altai 23 REPLACEMENT PARTS LIST cio a apse Be a aa 24 REPLACEMENT PARTS LIST FORPCB 25 26 SCHEMATIC DIAGRAM ise vs amm ss names ss Dead da EE SE 27 CIRCUIT BOARD ii ie dans tita A nes aa n sar dE 28 29 BLOCK DIAGRAM lt i sa sus es e dieva a S ain A ES da se aaa 30 PART 1 INTRODUCTION This service manual consists of two parts Part covers maintenance description adjustment procedures and trouble analysis and Part Ii covers
21. es and indicators to execute a specified function DIAGNOSTIC PROCEDURES Error Symptom Recognition Errors that occur because of the wrong operating procedure wrong programming the use of a defective diskette or soft errors due to external causes such as contaminated air and random electrical noise are often attributed to an FDD failure Unless a visual inspection of the FDD reveals an evident assembly fault or a defect always confirm errors with another good diskette and another known good FDD Soft Error Detection and Correction Soft errors are normally caused by the following 1 Contamination between read write heads and diskette This kind of contamination can be easily eliminated by the liner in the diskette Please follow the appropriate procedures provided with the cleaning diskette 2 Random electrical noise normally a few microseconds or less 3 Small defects in written data and or track not detected during write operation may cause soft errors during read 4 Faulty grounding of the FDD or host system can also cause soft errors 5 Wrong motor speed is another cause of soft errors Take the following steps on the controller side to recover from the soft errors mentioned above 1 Read the track again ten times or until the data is recovered 2 If step 1 above fails to recover the data access the adjacent track Then return the head to the original track 3 Repeat step 1 4 Any error that cann
22. hin this range Align the center with line A SST af A When the carriage is on an inner most track Inner most track lt 1 approximately within this range Fig 12 10 Drive Motor Removal Fig 12 9 2 Pail Tail Leading 20 12 11 LED Assembly Removal and Installation 1 Remove the clamp handle and front plate as described in section 12 2 2 Disconnect the J8 connector from PCB 3 Remove the LED assembly by sliding it slant from the cartridge guide assembly 4 Reverse the above procedure to reinstall 5 The LED can be removed and installed as it is Notch section O Holder LED LED Front Fig 12 11 LED Assembly Removal 21 12 12 Lifter Unit Removal and Installation 1 Remove the clamp assembly as described in section 12 5 2 Remove the lifter shaft clamping retaining ring and draw out the lifter shaft 3 Remove the lifter unit 4 Reverse the above procedure to reinstall Retaining Ring Lifter Unit Lifter Clamp Assembly Fig 12 12 Lifter Unit Removal 12 13 Media Lifter Removal and Installation 12 14 Media Sensor Assembly Removal and Installation 1 Remove the clamp assembly as described in section 12 5 1 Remove the PCB as described in section 12 1 2 Remove the lifter shaft clamping retaining ring 2 Remove the cartridge guide assembly as draw outthe lifter shaft described in section 12 7 3 Remove the media lifter 3 Draw
23. horizontal deflection to 20 ms division 5 Write 2F all 1 s on the entire circumference 6 Check that the average output level meets the specifications of Table 8 1 V ka Vmax Vmin average a If it does not meet the specifications refer to Item 7 of the Trouble Analysis Table 9 4 Output Modulation Verification Modulation is calculated by the following formula Modulation Vmax Vmin x 100 V max Vmin Using the value obtained in section 9 3 and check that the calculated value meets the specifications of Table 8 1 Maximum voltage Value Vmax Average Voltage Minimum Voltage Value Vmax Fig 9 1 Modulation 95 Resolution Verification 9 6 1 2 3 Leave the oscilloscope in the same condition as mentioned in section 9 3 Resolution is calculated by the following formula Resolution V2Faverage y 100 Vip average Check that the calculated value meets the specifications of Table 8 1 Radial Alignment Verification and Adjustment Introduction This adjustment is normally not necessary If the mounting screws for the stepper motor loosen or if parts become defective or if a compatibility error occurs check and readjust according to the following procedure Steps 4 to 9 below should be performed regardless of the type CE or DAD alignment diskette used Use an alignment diskette suitable to the type of FDD to be adjusted according to Table 3 1 1 2 3 4 5
24. ot be corrected by the above procedure is irrecoverable Write Error If an error occurs during write operation it is usually detected during the next revolution by performing a read operation called write check To correct an error write again and repeat a write check operation If the result is unsatisfactory after ten or more write operations perform a read operation on another track to determine whether it is the diskette or the drive that is wrong If an error persists replace the diskette and repeat the above procedure If the error still persists assume the FDD defective If the error is corrected the diskette is defective It can be thrown away 5 4 5 5 5 6 6 1 Read Error Most read errors are soft errors Data can be recovered by following the recovery procedure in section 5 2 Seek Error Seek errors are caused by the following 1 Stepper motor or stepper motor drive circuit is faulty 2 Faulty Carriage There are two ways to recover from a seek error One is to recalibrate to track 0 and seek back to the original track The other is to read the ID field check the track number on which the head is located and move the head away from it Read it again Interchangeability Error Data which is written by one FDD may not be read by another This error is called a interchangeability error which can be caused mostly by the following reasons which should be checkedas follows 1 Head misalignment
25. rack 0 Waveform u Fig 9 6 1 Track 0 Adjustment 10 9 10 Asymmetry Verification 1 Insert a work diskette 2 Step to the track specified in the asymmetry item of Table 8 1 3 Setthe oscilloscope as follows TRIG SYNC VERT HORIZ 4 Write 1F 5 A read waveform is displayed on the oscilloscope as shown in Fig 9 7 6 Confirm if it satisfies the value as shown in Fig 8 1 Fig 9 7 Asymmetry Waveform 1 1 10 TEST POINTS Printed Circuit Board Top View GND Vout Vout GND TRK 0 INDEX STEP READ DATA 12 11 PANASONIC ALIGNMENT DISKETTE Table 10 1 Panasonic Alignment Diskette Index Radial GEES 817 128 34 TRK 34 TRK 16 TRK WEN 13 PART Il 12 REMOVALS AND INSTALLATIONS 12 1 PCB Removal and Installation Caution of the cable leading Remove the four shield plate mounting screws and take out the shield plate 2 Removethe one PCB mounting screw 3 Disconnect the connectors J3 CON J4 CON J5 rib projected on the CON 37 CON J8 CON from the PCB 4 To reinstall reverse the above procedure 5 Readjustment is not necessary after PCB ld A The cable shall not replacement protrude above the upper face of the drive Make it flat by pressing with a finger 1 Let the cable pass under the C guide Hook the cable to the Do not Iet the pig tail bitten or disconnected Do not damage or disconnect the pig tail by pressing it forci
26. t ciuciit Track 0 assembly PCB track 0 detection failure See Item 1 See Item 2 Head load solenoid PCB head load circuit Stepper motor Guide shaft contamination or damaged PCB stepper driver circuit See Item 1 See Item 4 Head disconnected Head shorted Head load bail height wrong PCB write circuit See Item 1 See Item 4 See Item 6 PCB read circuit See Item 1 See Item 4 See Item 7 Alignment Azimuth Index burst Asymmetry Limiter Track 0 Head load time Index period PCB read circuit LED part PCB IN USE circuit Write protect part Write protect circuit Un o N won tlight Write protect failure CA j es EN ER o d O 3 N 7 PREVENTIVE MAINTENANCE No preventive maintenance is necessary for any FDD under normal conditions However if adjustments are necessary the procedures in this manual must be followed e Adjustments Refer to Table 8 1 1 Make a read write head radial adjustment at the specified track Sides 0 1 2 Make an index burst adjustment at the specified track Sides 0 1 3 Make an azimuth measurement at the specified track Sides 0 1 CAUTION Do not write when using alignment diskette Check that write protect sensor is properly operating with a data diskette Note Section9 describes the adjustment procedure in detail 8 SPECIFICATIONS Table 8 1 Specifications MINI a type Drive motoris dual speed type 300 rpm 3
27. y from the following locations on the J3 connector No5 7 Atthat time draw out the pins with lifting the stopper on the connector Remove the write protect sensor mounting screw and index sensor mounting screw respectively Reverse the above procedure to reinstall When reinstalling the write protect sensor exercise care so that the leads and write protect sensor will not project from the bottom and side of the base After index sensor installation adjust the index burst as described in section 9 8 12 7 Cartridge Guide Assembly Removal and Installation 1 Removethe PCB as described in section 12 1 2 Remove the handle and front plate as described in section 12 2 3 Remove the clamp assembly as described in section 12 5 4 Remove the write protect sensor mounting screw 5 Remove the three cartridge guide mounting screws and take out the cartridge guide assembly ihdex nsor Olande 6 After reinstallation adjust the collet assembly index Sensor Red as in section 12 4 step 6 and adjust the index Write Protect Sensor Black burst as in section 9 8 Write Protect Sensor Green 7 When removing or reinstalling be careful not to damage the carriage arm with the lifter index Sensor Write Protect Sensor Cartridge Guide Assembly Fig 12 7 Cartridge Guide Assembly Removal Fig 12 6 Write Protect Sensor Assembly and Index Sensor Assembly Removal 17
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