Teac FD-55AV, Maintenance Manual

Page 1: ...TEAC FD 55AV GV MINI FLEXIBLE DISK DRIVE MAINTENANCE MANUAL REV A...

Page 2: ...TEAC FD 5SAV GV MINI XI3LE DISK DRl JE H INTI N _ G P Jl NU lL i...

Page 3: ...ction and operating waveform of read write LSI terminals 318 3 2 2 Control Circui t 326 3 2 2 1 Strap circui t 328 3 2 2 2 LED and head load control circuit 329 3 2 2 3 Write erase control circuit 333...

Page 4: ...sk calibration 4021 4 2 4 5 Alignment disk calibration 4023 4 2 4 6 Humidi ty setting 4026 4 2 4 7 Setting 0 f SKA gain 4026 4 2 4 8 Setting of FDD straps and SKA special key 4027 4 2 5 Others 4029 4...

Page 5: ...age Ass y 4110 4 5 1 1 4 5 1 2 Replacement of v type carriage Replacement of L type carriage 4110 4117 4 5 2 Replacement of Stepping MQtor Ass y 4121 4 5 3 Replacement of DD motor Ass y Spindle motor...

Page 6: ...SECTION 3 THEORY OF OPERATION 300...

Page 7: ...ECT 3 WRITE GATE MOTOR ON STEP DIRECTION SELECT IN USc HEAD LOAD TRACK 00 INDEX WRITE PROTECT READY 12V SV OV Cunt rol circuit Indi cator Servo circuit Magnetic head Head load solenoid Track 00 sensor...

Page 8: ...r mounting the various mechanisms and printed circuit boards The frame is made of aluminum diecast to maintain the stability of the FDD in strength precision durability and expansion coefficient 2 Doo...

Page 9: ...ead wri te core gaps ___ Rota tional direction of disk Erase cores Fig 302 External view of magnetic head core The magnetic head assembly head carriage Ass y of a single sided model A or E model is bu...

Page 10: ...st the side 1 surface of a disk For a double sided model the side 1 head attached to the upper arm of the carriage is depressed against the side 1 surface of a disk with an appropriate pressure The si...

Page 11: ...to obtain a highly precise positioning The parallelism and the distance between the shafts and the center line of a disk and shafts and capstan themselves are precisely machined Also the thermal expa...

Page 12: ...r to Note 12 of item 5 2 1 and Table 505 the frame edge functions like a track 00 stopper And if L type carriage refer to Table 504 is used a screwed small parts functions as a track 00 stopper When s...

Page 13: ...t Read write circuit and control circuit are mounted on the PCBA MFD control H and servo circuit is on the PCBA DD motor servo 3 2 1 Read write Circuit The read write circuit is constructed with mode...

Page 14: ...9 2 J h C25 TPe J I DIFO R iOO _ CT I VE rn C I J 1 2 T C24 I n _ r _ _ R W 1 0 fIool ff3f HE AO f tl PRE 0 J FFE RENH AT OR I CJ TP7 _ 8 L SW ITCH f tl AMP E AK uo J _ S y 6 4Ib r v R 01 IT f MATRIX...

Page 15: ...nd C3l are activated to increase the capacity of the low pass filter capacitor C29 This state is the On state of the switch filter and the cut off frequency of the low pass filter is set to low 2 Writ...

Page 16: ...Rll or R12 Models and track position Switching item A B 48tpi E F 96tpi G 96tpi high density all tracks Tr 00 V43 Tr 44 V79 Tr 0Q V43 Tr 44 79 SF signal H H L H L Switch filter INo circuit ON OFF ON O...

Page 17: ...ther amplifies the signal with the most appropriate equalization The peak detector constructed with a comparator converts the differentiated output after passing through the coupling capacitors C24 an...

Page 18: ...SI 14 A B RDYO H L During write Drive not READY RDYO LOW _ E 08 B C APS H L During write During motor start lOA ting 36O V380ms after MON Head lSA seek operation F V OOD OPEN H H The same as 0Qt 04 of...

Page 19: ...utput TP5 Differentiation amp output TP7 Differentiation amp output TP8 l __ J t __t r __ 2 5V approx L l f l T 2 5V approx 2 5V approx l I r _4 ___ _t_ 2 5V approx Peak detector output in us I L Fig...

Page 20: ...x G model O S ls approx U U U LnJIJ LJ RD output US 33 READ DATA Jl 30 Read data latch output in uS Edge detector 2 output in uS Peak detector output in US Edge detector 1 output in uS Delay s s Q out...

Page 21: ...ltage approx Sl WG EG I COMO COMl H H H SIDE 0 read operation 2 7V OV H I L SIDE 0 write operation 11 sV OV H L SIDE 0 write operation 11 SV OV L H H SIDE 1 read operation OV 2 7V L L SIDE 1 write ope...

Page 22: ...o the read write head by turning on and off the two write drivers alternately WRITE GATE Jl 24 Erase on Erase off delay delay WG US 29 EG TP2 SIDE ONE SELECT Jl J2 L ___L WRITE DATA Jl 22 Write data l...

Page 23: ...the operation of the common driver write driver erase driver and write control logic in the LSI which protect the disk from an erroneous write or erroneous erase during unstable state of the power vol...

Page 24: ...ox I I I WRITE DATA interval Side 0 write b RWOl pin 13 RWll pin 15 Terminals for side 1 head connection Ll 11 sV approx RITE DATA interval Side 1 write c GSC pin II GSO pin 10 GSl pin 9 l Side 0 read...

Page 25: ...6 and 7 are opposite each other Refer to Fig 304 A 7 L V e 2 7V approx Read 2 Differentiation amplifier a DIFI pin 5 pin 4 2 7V approx Write Differential input terminals to the differentiation amplifi...

Page 26: ...prox write 2 7V approx Differential input terminal of the comparator peak detector The phase of pin 43 and 42 are opposite each other fV fV j W 2 5V approx Read 3 Time domain filter a TDCR pin 40 2 5V...

Page 27: ...MO pin 21 COMl pin 19 2V approx write read inhibit Output terminals of the cornmon driver Two terminals are equipped for the side 0 and side 1 heads respectively Refer to tables 303 and 304 as to the...

Page 28: ...ite current is determined The current is calculated by the expression in item 3 2 1 1 2 d WT pin 17 pin 18 External resistor terminals for the head tennination in write operat ion An appropriate value...

Page 29: ...27 Schmitt TTL input Control input terminal having following two functions Table 304 Refer to i ON OFF control of write current setting terminal WCSl ii Selection of erase driver output terminals EOO...

Page 30: ...TL input Control input terminal of RD output Refer to Tables 302 and d AGND pin 16 EGND pin 23 and DGND pin 38 OV power terminals mainly for the following circuits in the LSI AGND Analog operation cir...

Page 31: ...0 Hi Z Z F WCS 0 E L H L H H 0 Hi 0 Z F 0 r H H L H 0 Hi 0 Z 0 H F WCS a s H L H L H Hi 0 Z Z F WCS 0 1 e I L H H L H Hi 0 Z 0 F 0 H H H L H Hi 0 z 0 F WCS 0 1 H L L L H 0 Hi Z Z F WCS 0 1 L H L L H 0...

Page 32: ...etector stepping motor control circuit track counter disk change circuit interface driver etc Almost all the circuits except for drivers are enclosed in the control LSI U3 Since the LSI is a CMOS type...

Page 33: ...WRllE GAlE MOTOR ON INDElC TRACK 00 WRllE PROTECT READYI DISK CHANGE l 40N1 l 40NO DSEl I ISTP ill DeDO IDXO TOO WPO RDYO STRAPS J RY Xl LSI U3 CLOCK I 1 CLOCK GENERATOR STEPP I NG MOTOR INDEX SENSOR...

Page 34: ...posts are available Refer to the Specification items 1 11 and 1 12 as to the details of strap function Some models have not strap posts These models have soldered jumping wires instead of the strap po...

Page 35: ...to output to the LED driver and the solenoid driver as OLEO and HLC signals a DLED signal A signal to turn on the front bezel indicator LED While this signal is LOW level the LED turns on Strap setti...

Page 36: ...re one rotation of the disk one INDEX pulse Table 306 Solenoid drive condition 2 LED driver DLED signal from the control LSI U3 is inverted and is input to the driver IC U7 U7 is constructed with NPN...

Page 37: ...t 1 and it makes Q5 turn on while the signal is LOW level l2V power is applied to the solenoid at that time to execute the drawing in action of the solenoid securely After the overdrive period the sol...

Page 38: ...HLC input HOD output Applied voltage to solenoid coil l 1 12V approx I J _ llv approx 4V approx I I OV overdrive period approx Fig 310 Overdrive timing of head load solenoid 332...

Page 39: ...r LHS060A WG DSEL L x IWG L x FPT L x MON delay 1 x SEEK b Control LSI 2206 00 LHS060B WG DSEL L x IWG L x FPT L Notes WG Write operation at HIGH DSEL DRIVE SELECT input signal LOW IWG WRITE GATE inpu...

Page 40: ...t terminals of the control LSI Only the SPED terminal is used for selection of the FDD here U3 input terminals Erase delay FDD model ERO ERI ER2 On delay Off delay SPED A rF model H L L L 250 26711s 8...

Page 41: ...ions MC MONO L MONl L x 123us delay x DISK Notes MC Motor rotation at HIGH MONO MOTOR ON input signal LOW MONl Differs depending on PCB issue Issue A E Fixed at FALSE HIGH Issue F DLED is low at ML st...

Page 42: ...are detected after the motor start In the typical case the motor speed reaches within 6 of the rated speed when the next pulse is detected after the pre ready state The ready latch will be set at tha...

Page 43: ...Constant speed t 6 Max 360rpm l66 7ms t 300rpm 200ms I 2t 380 40Oms 36O V380m 360rpm 73Oms Max 300rpm 800ms Max RDYO output MON delay 1 in U3 MON delay 2 in U3 Ready latch in U3 50 speed detection in...

Page 44: ...All the five parts of ready detector are reset by the Me signal going FALSE LOW level 338...

Page 45: ...al The latched output is supplied to the bi directional shift register and changes the activating order of the stepping motor coil as shown in Fig 312 2 Internal step generator The circuit has followi...

Page 46: ...ng signals for the uni polar 1 2 phase drive of the 4 phase stepping motor These phase drive signals are output from the control LSI and supplied to the coil driver In order to improve the torque marg...

Page 47: ...OD Overdrive timer 2 output STEP Jl 20 ISTP Direction latch in U3 96tpi or 48tpi 3 6 tl t2 PNB PB PNB SOD Overdrive timer 2 output Coil driver input PA 48tP ternalstep gen in U3_ _ a I s r o x _I Oms...

Page 48: ...it makes Q6 turn on during LOW level At that time 12V power is applied to the stepping motor coils to execute the seek and settling operations securely with high torque After the completion of the set...

Page 49: ...wing conditions TOO TOS x Step out x PA Notes TOO Track 00 detected at HIGH TOS Track 00 sensor output at TP3 TOS input of LSI is HIGH Track 00 sensor detects the light disturbing wing of the head car...

Page 50: ...of L I The head is under seek operation 10 12msec for 96tpi and 13 15msecfor 48tpi after the last step pulse 2 OSCI OSCO terminals and clock generator It supplies clocks for operation to all the circu...

Page 51: ...k change circuit generates DISK CHANGE signal which indicates that the disk is removed from the FDD It is used only in some optional models with disk sensor t lhen a disk is removed the DISK signal fr...

Page 52: ...f output condition In one of the types signals from the LSI are output as they are In another type they are output only when the FDD is in ready state by means of ANDing with RDYO signal The interface...

Page 53: ...ervo IC Energization and magnetized direction of the coils are controlled by the signal from the hall elements mounted on the servo PCBA around the rotor so that they are changed corresponding to the...

Page 54: ...and variable resistors G Rl Rl for asyrr etry adjust T Pl Index TP2 Erase Gate TP3 Track 00 TP4 Pre amp TP5 Pre amp TP6 DC OV TP7 Differentiator TP8 Differentiator PCBA MFD control version PCBA revisi...

Page 55: ...he LED is mounted on the DD motor spindle motor Ass y The test point is used for the following purposes a Confirmation of the disk rotational speed b Rough confirmation and adjustment of the index bur...

Page 56: ...e current flows through the erase head This TP is used for the check of the required delay time of the erase gate signal against the WRITE GATE input signal WRITE GATE input signal I_l L On delay U Of...

Page 57: ...Therefore the level change timing of the TRACK 00 signal is not consistent with that of the TP3 signal 4 TP4 TP5 Pre amplifier Test point to observe the read pre amplifier output signals The pre ampli...

Page 58: ...rved at TP7 and TP8 respectively For an accurate observation of the waveforms use two channels of the oscilloscope with one channel set to Invert mode and Add both channels Use TP6 OV test point for t...

Page 59: ...to use a small size clip to obtain a probe ground of the 353...

Page 60: ...rite IF data and observe the pulse intervals at the READ DATA output line Then adjust the variable resistor so that the read data as etry takes the minimum value Repeat each adjustment alternately for...

Page 61: ...SECTION 4 MAINTENANCE 4000...

Page 62: ...t is effective to improve the reliability of the data If some of the parts in the FDD are operated at a specially heavy duty condition or if the FDD is operated over 5 years it is recommended to repla...

Page 63: ...1 r adjustment of holder 5 minutes 4 4 2 A a n a l l position 3 Check and adjustment of arm lifter 5 minutes 4 4 3 Model with head load solenoid 4 Check of CSS Ass y CSS model 5 minutes 4 4 4 5 Check...

Page 64: ...hey are distinguished as SKA A V F here for convenience sake However when the identification of each SKA model is not so important all SKAs in table 403 are generally called as SKA in the following ex...

Page 65: ...e SKA power supply i Power cable 4P e Thermometer and hygrometer B When SKA is not used a FDD controller and DC power supply user s system b Oscilloscope two channels c Frequency counter d DC clip on...

Page 66: ...le sided FD 55BV FV GV c Level disk i For Normal density FD 55AV FV PIN 14900015 00 ii For High density FD 55GV PIN 14900015 01 Note Commercially available disks may be used if there is no doubt d Ali...

Page 67: ...king paint Three Bond 1401B d Screws and washers Refer to item 5 2 2 e Oil Kantoh Kasei FLOIL 464P TEAC PIN 10854022 f Grease Kyodo Yushi Mu1temp P2B TEAC PIN 10857031 Note Be sure to use well calibra...

Page 68: ...ation of air damper option 3Kg cm M3 setscrew Installation of L type front lev r 4 5Kg cm Ass y option Table 404 Torque applied to screws 2 Apply fresh locking paint to the following designated points...

Page 69: ...t for terminator network Some models are not equipped d J4 Head load solenoid track 00 connector e J5 PCBA front OPT H connector f J6 Stepping motor connector g J7 Spindle motor DD motor Ass y connect...

Page 70: ...le protect sensor J4 J8 Option t J9 J5 Option Option Index sensor Top view of the FDD motor Ass y Spindle motor PCBA MFD control H J3 Jl Card edge J2 Bottom view of the FDD J4 J8 Option Fig 40l Types...

Page 71: ...own in Fig 402 carefully pull up the edges of the upper protruding area of the connector little by little with the finger nails or with a screwdriver Housing clamper Post pin side Cable I Pin numbers...

Page 72: ...al removal iii No tarnish or contamination should be on the contact area of t e pin or the PCB side post pin If there is remove it Contact failure may happen if any of these three points is not satisf...

Page 73: ...as cutter knife pull the cable with a pair of tweezers in the direction indicated by the arrow Refer to Fig 404 Projection Contact area pull up Clamp securely Cable Fig 404 sectional view of black co...

Page 74: ...the cable has appropriate looseness when the head carriage is set to track 00 rear end of the moving area and that the cable does not touch the stepping motor and does not strike the bottom of the ca...

Page 75: ...2 Form the cable not to have excessive looseness in the area from the head connector to the cable guide 4014...

Page 76: ...voltage of DC power supply to 12V and 5V approx 2 Turn the DC power off and connect the power cable to the PSA SKA PWR connector of the SKA 3 Set the FD PWR switch of the SKA to the OFF position PSA...

Page 77: ...ls 6 9 G of the SKA The shielded wire side comes to terminals 6 7 side of the SKA 8 Connect the white connector without shielded wire of the check cable S to terminals 1 S of the SKA Green wire side c...

Page 78: ...Note The above items 1 2 7 8 10 15 may be omitted for replacement of the FDD or a temporary FDD power off Remain the DC power on for the SKA and control the FDD power by the SKA PWR switch 4017...

Page 79: ...not required if the maximum track number is the same as the initial value of the SKA 1 Key in CF SET TMAX 2 The maximum track number set at that time is indicated with the latter two digits of the DAT...

Page 80: ...RATE 2 Step rate set at that time is indicated by O lmsec scale on the DATA indicator I I I J I ms e g DATA indicator It dOl indicates 6 Omsec 3 Key in a new step rate down to one decimal place unit m...

Page 81: ...7 Depress F key STOP Setting of the settling time completes e g 48tpi Step rate 6msec Settling time 15msec DB 60 F 150 F 96tpi Step rate 3msec Settling time 15msec DB 30 F 150 F 4020...

Page 82: ...setting of the following is not required 1 Innermost track read level a Key in DO CALIBRATION READ LEVEL b Calibration value set at that time is indicated in the latter three digits of the DATA indica...

Page 83: ...e g READ LEVEL 103 RESOLUTION 96 DO 103 F Dl 96 F Note The setting in this item is not required when the level disk is not used i e when it is substituted with a commercially available disk and no acc...

Page 84: ...the initial setting of the following is not required 1 SIDE 0 alignment a Key in EO CALIBRATION SIDE 0 ALIGNMENT b The calibration value set at that time is indicated in the latter two digi ts of the...

Page 85: ...tion of alignment lobe pattern 3 Index burst timing a Key in E5 CALIBRATION INDEX TIMING b The calibration value set at that time is indicated in the latter three digits of the DATA indicator I I I I...

Page 86: ...1 t tl _Index burst timing Notes 1 The index timing is calibrated in the SKA according to the following expression Calibrated timing t calibration value s 2 If the calculated value with the above exp...

Page 87: ...KA I Key in F2 11 CALIBRATION RH ALIGNMENT 2 The relative humidity set at that time is indicated in the latter two digits of the DATA indicator I I I I I 3 Input the relative humidity percentage in th...

Page 88: ...on b Ul tV IU block IU may be on or off Others are off c FG block Make FG on d Other blocks Initial setting of the FDD Note If the strap position of the FDD is changed from the initial setting at the...

Page 89: ...SKA turns on Refer to the specification as to the function of the signal and its relation to the straps 4028...

Page 90: ...points TP 4 5 Pre amplifier and TPs 7 8 Differentiation amplifier Connect the probe ground to the TP6 OV on the PCBA MFD control H b For the observation at the other test point Connect the probe grou...

Page 91: ...maintenance 5 Maintenance environment Maintenance of the FDD should be done on a clean bench at room temperature and humidity It is recommended to execute the check and adjustment of the track alignme...

Page 92: ...ror test In the check and adjustment in item 4 4 read write error test is not included After the adjustment or the replacement of the maintenance parts it is recommended to perform a data error test b...

Page 93: ...ning disk 2 SKA or user s system B Cleaning procedure 1 General method a Install an appropriate cleaning disk and start the spindle motor Notes 1 Do not use a damaged cleaning disk on the surface 2 Fo...

Page 94: ...ong cleaning time is not effective but has possibility to accelerate the head wear c Remove the cleaning disk 2 SKA method a Connect the SKA referring to item 4 2 4 and set the FD PWR switch to the PS...

Page 95: ...ning as follows A Equipment 1 Absolute alcohol Ethanol 2 Cotton swab or gauze B Cleaning procedure 1 Lightly dampen a cotton swab or a gauze with alcohol 2 Lift up the pad arm see Fig 4l0 and clean th...

Page 96: ...Pad Set arm Magnetic head surface Head carriage Ass y Arm lifter Fig 4l0 Direct cleaning of the magnetic head Single sided only 4035...

Page 97: ...m can be moved manually without getting out of place 2 Close the set arm by turning the front lever 3 In this condition item 2 adjust the set arm so that the visial distance of the gap between the col...

Page 98: ...1Front lever Collect shaft arm fbcing sc ews Gap between collet shaft and set arm hole Fig 4l1 Adjustment of set arm position 4037...

Page 99: ...rt it for pass side and closing the front lever confirm that the lever can be closed 4 If the item 2 or 3 is not satisfied adjust the holder position according to the following procedure a Loosen four...

Page 100: ...specified torque e Confirm items 1 through 3 f Check for the file protect sensor according to item 4 4 5 g Check and adjust the index burst timing according to item 4 4 15 jig Front lever Pass side S...

Page 101: ...Front Holder fixing screws 2 each side Fig 413 Adjustment of holder position I Front lever MAX media jig Fig 4l4 Adjustment of holder position 2 4040...

Page 102: ...r s system 4 Oscilloscope 5 Locking paint B Check and adjustment procedure 1 General method a Install a work disk and start the spindle motor b Set the head to track 00 c Execute head loading d Confir...

Page 103: ...lifting part adjusting screw paint Head load solenoid Ass y Fig 4l5 Adjustment of arm lifter Arm lifting part O 2rnrn Min Arm lifter Note Viewed from front bezel side Fig 416 Gap of arm lifter 4042 He...

Page 104: ...1 head i Execute the head loading j Execute 2F write operation WRITE DATA frequency of 250KHz for FD 55AV FV and 500KHz for FD 55GV for one rotation of the disk k Unload the head L Repeat the head lo...

Page 105: ...d If the side 1 head is lifted too high during unload operation spike noise will be observed while unload level will be observed when it is too low n Set the oscilloscope trigger to the negative mode...

Page 106: ...head window edge of the disk jacket opening area of the jacket to make the head be in contact with the disk surface The jacket can be drawn out smoothly with appropriate space margin t Insert the disk...

Page 107: ...control H according to item 4 5 7 No replation to items 5 and t Note Apply a drop of locking paint if the setscrew is adjusted And if the strap setting is changed back it to the initial setting after...

Page 108: ...p is narrower than 0 2mm turn the adjusting setscrew of the arm lifter Refer to Figs 4l5 and 416 g Release the drive select by key 0 OSO indicator turns off h Confirm that the upper arm is lifted slig...

Page 109: ...4IS Read waveform at head unloading 0 Confirm that there is no big spike noise excludes a small one or there is not a continuous unload level excludes the noise level as shown by dotted line in Fig 4l...

Page 110: ...vel in item 0 will be excluded unless it is the same read level as the head load condition Depress key 4 to turn off the SIDE 1 indicator of the SKA and confirm in the same procedure of items L throug...

Page 111: ...de 1 head and goes into the FDD smoothly with appropriate space margin z If the items t v x or y is out of the specification refer to item u of General method Note Apply a drop of locking paint if the...

Page 112: ...irm that the gap between the pad arm and the arm lifter is larger than O 2rnrn If the gap is narrower than 0 2rnrn turn the adjusting screw of the arm lifter Refer to Figs 41S and 416 e Unload the hea...

Page 113: ...Note After adjusting the setscrew apply a drop of locking paint 4052...

Page 114: ...he pad arm and the arm lifter is larger than 0 2mm If the gap is narrower than 0 2mm turn the adjusting setscrew of the arm lifter Refer to Figs 4l5 and 416 g Release the drive select by key 0 050 ind...

Page 115: ...insertion of a disk b Confirm that the side 1 head is lifted even if the front lever is closed and it has enough gap against the side 0 head See Fig 4l9 Side 1 head 1 Gap o head Fig 4l9 Gap between s...

Page 116: ...left side of the head carriage moves as in Fig 420 by opening closing of the front lever and insertion ejection of the disk Cam Rotates about 90 i Disk is not fully inserted ii Disk is fully inserted...

Page 117: ...jacket to make the head be in contact with the disk surface and that the jacket can be drawn out smoothly with appropriate space margin e Confirm that the cam natural color of the CSS Ass y attached...

Page 118: ...k Key in Cl SET TMAX L Confirm as in item j 4057...

Page 119: ...ine c Insert the MAX media jig C from open side and set it so that the notch A area is located on the light pass from the file protect sensor LED See Fig 421 d Adjust the orientation of the FDD so tha...

Page 120: ...MAX media Notch B Notch A Front lever Fig 42l Check of file protect sensor 4059 File protect sensor...

Page 121: ...d on the light path from the file protect sensor LED See Fig 42l c Adjust the orientation of the FDD so that it is not exposed with strong light d Confirm that the WPROT indicator of the SKA turns on...

Page 122: ...for high density B Check procedure 1 General method a Connect a frequency counter to TPl Index on the PCBA MFD control H or to the INDEX interface signal line b Install a work disk and start the spin...

Page 123: ...tor by key 5 MON indicator turns on d Execute drive select by key l O DSO indicator turns on e Key in CO and confirm that the TRACK indication becomes 00 RECALIBRATE f Key in C3 INDEX PERIOD g Confirm...

Page 124: ...r channel to the WRITE GATE interface line and the other channel to TP2 Erase gate delay on the PCBA MFD control H Oscilloscope range For both channels DC mode 5V 100 sec b Install a work disk and sta...

Page 125: ...ig 423 is within the following range FO 55AV tV FV 860 tV 95011sec FO 55GV 500 tV 56011sec WRITE GATE l _ TP2 Erase gate t l _ Erase on delay Fig 422 Erase on delay lRITE TP2 Erase J gate I t2 Erase o...

Page 126: ...cute drive select by key 0 DSO indicator turns on e Key in 7 WRITE GATE ON f Confirm that the DATA indicator vs shows a value within the following range Erase on delay FD 55AV FV 200 320 sec FD 55GV 1...

Page 127: ...rocedure 1 General method a Connect an oscilloscope to TP7 or TP8 Differentiation amp on the PCBA MFD control H Oscilloscope range AC mode 0 1 0 2V b Install a work disk and start the spindle motor c...

Page 128: ...e upper side of the head pad by 30 steps approx with a common screwdriver see Fig 424 At each turning of the groove execute write and read operations in item e Be sure to take apart the common screwdr...

Page 129: ...For a commercially available general disks the desirable current is 250mA Max Inferior head Replace the head carriage Ass y according to item 4 5 1 iv Remove the work disk and apply a drop of locking...

Page 130: ...head surfaces are not in parallel each other it is considered to be the deformation Replace the head carriage Ass y according to item 4 5 1 iii Inferior pressure of the jacket pads If the jacket pad...

Page 131: ...I mV indicates the average read level of TP4 and TP5 Pre amp after each cycle of operation one rotation of write and one rotation of read is finished i Observe the DATA indicator I I I I I mV with a s...

Page 132: ...ion in item k iii Caution should be done as follows i Stop all the commands already input by depressing plI key ii Key in DP 12V CURRENT iii Measure the 12V current consumption at that time by the DAT...

Page 133: ...otor c Set the head to the innermost track d Execute the head loading e Execute IF write operation for one rotation of the disk 125KHz of WRITE DATA frequency for FD 55AV FV and 250KHz for FD 55GV f M...

Page 134: ...e operation in item i for side 0 and side 1 heads alternately The variable resistor shall be so adjusted that both asymmetry for side 1 and side 0 heads take the minimum value j If the adjustment in i...

Page 135: ...iv Inferior PCBA MFD control H Replace the PCBA according to item 4 5 7 4074...

Page 136: ...tall a work disk e Start the spindle motor by key 5 MON indicator turns on f Execute drive select by key 0 DSO indicator turns on g Key in CO and confirm that the TRACK indication becomes 00 RECALIBRA...

Page 137: ...the specified range adjust according to the following procedure i Adjust the variable resistor Rl on the PCBA MFO control H so that the asymmetry takes a small value by keying in 04 ii For a double s...

Page 138: ...the above range Set either of the channels to Invert mode and Add both channels b Install a level disk and start the spindle motor c Set the head to the innermost track d Execute the head loading e Ex...

Page 139: ...assumed i Inferior disk Disk and or jacket is deformed or cacaged Replace the level disk with a new one ii Abnormal disk rotational speed Check for the speed according to ite 4 4 6 iii Inferior head...

Page 140: ...K TMAX g Key in 07 WRITE READ LEVEL DIF 2F Calibration value of the level disk should be set previously in the SKA h Confirm that the DATA indicator of 40OmVo p Min mVo p indicates the value i For a d...

Page 141: ...els 1 and 2 to the above range Set either of the channels to Invert mode and Add both channels b Install a level disk and start the spindle motor c Set the head to the innermost track d Execute the he...

Page 142: ...owing range Innermost track resolution FD 55AV BV 55 Min FD 55EV FV GV 60 Min k For a double sided FDD execute items e through j for side 0 and side I heads respectively L If the value in item j or k...

Page 143: ...head carriage Ass y according to item 4 5 1 v Inferior PCB MFD control H Replace the PCBA MFD control H according to item 4 5 7 m Eject the level disk and release the Invert and Add modes of the oscil...

Page 144: ...bration value of the level disk should be set previously in the SKA h Confirm that the DATA indicator indicates the value within the following range Innermost track resolution FO 55AV BV 55 Min FO 55E...

Page 145: ...e or extreemly high or low humidity shall be avoided Check and adjustment should be done after two hours Min of storing in the above mentioned condition It is recommended that the orientation of the F...

Page 146: ...lobe pattern If only one lobe pattern can be observed or if two lobes become one pattern the head is not on the alignment check track In such event execute step out or step in for the following tracks...

Page 147: ...lignment true value VA VB x 100 Larger value in Calibration value Relative humidity 50 x K K is humidity compensation factor 48tpi K 0 26 96tpi K 0 42 e g 96tpi VA 0 58V VB O 6lV Calibration value 6 R...

Page 148: ...t check track during both step in and step out operations by turning the jig or the screw stepping motor moves little by little Note When you adjust the alignment by observing the lobe pattern using t...

Page 149: ...il the both misalignment take the smallest value v Tighten the two fixing screws 6fthe stepping motor little by little for adjusting the true value of misalignment after tightening the screws with the...

Page 150: ...Stepping motor Alignment adjustment jig Fig 430 Adjustment of track alignment 4089...

Page 151: ...by key 5 MON indicator turns on f Execute drive select by key 0 DSO indicator turns on g Key in CO and confirm that the TRACK indication becomes 00 RECALIBRATE h Set the head to the alignment check tr...

Page 152: ...j For a 96tpi FDD the following steps shall be done under the turn on condition of the H GAIN indicator in order to improve the measurement accuracy and switching of humidity coefficient Turn on the B...

Page 153: ...mallest value The stepping motor moves little by little when the jig or the screw is turned iv For a double sided FOO repeat the adjusting operation in item iii alternately for side 0 and side I heads...

Page 154: ...uch as possible 1 General method a Connect an oscilloscope or a digital voltmeter to TP3 Track 00 sensor on the PCBA MFD control H Oscilloscope range DC mode lV b Install a work disk and start the spi...

Page 155: ...ut direction make apart from the rear side of the head carriage Note If the V type carriage refer to Table 505 is mounted the track 00 stopper is not equipped Item i is not required for this case ii C...

Page 156: ...e TP3 voltage at track 01 48tpi or track 02 96tpi IV 3V 2V approx center x Confirm the items d through g xi Adjust the track 00 sensor position so that the values in items ix and x satisfy the specifi...

Page 157: ...o 18 or pin 3 of J3 resistor network PAl for terminator on the PCBA MFD control H trigger c Key in B8 F STEP observation d Install a work disk and start the spindle motor by key SII MaN indicator tur...

Page 158: ...432 TP3 voltage VL 0 5V Max TP3 voltage VH 3 7V Min Step out DIRECTION SELECT External trigger J 1 2 3 4 5 1 Step in 2 3 4 5 SKA OOUT TP3 Track 00 sensor r VH OV 48tpi tA O Ams Track 00 tB 3 lms dete...

Page 159: ...ot equipped Item i is not required for this case ii Connect the 2nd channel of the oscilloscope to TP7 or TP8 Differentiation amp of the PCBA D control H and change the trigger to this channel Oscillo...

Page 160: ...the track 00 sensor see Fig 431 and adjust the se sor position where the requirements in item i are all satisfied xii Repeat the adjustment so that the values in item i fall within the specified range...

Page 161: ...tep out command head carriage rests on track 00 d Confirm that the gap between the head carriage and the extreme end of the track 00 stopper is 0 1 0 45mm See Fig 433 If the V type carriage is mounted...

Page 162: ...nd if anyone of the items d through g is not satisfied adjust the track 00 stopper position according to the following procedure i Set the head to track 00 ii Loosen the fixing screw of the track 00 s...

Page 163: ...stopper Stepping motor fixing screw Note Track 00 stopper small metal parts is not equipped if the V type carriage is mounted For this case frame protruding point works like as a stopper Fig 433 Chec...

Page 164: ...nfirm that the head carriage does not move even if 9 is keyed in head carriage rests on track 00 g Confirm that the gap between the head carriage and the extreme end of the track 00 stopper is 0 1 O 4...

Page 165: ...f the items g through k is not satisfied adjust the track 00 stopper position according to the following procedure i Key in CO and confirm that the TRACK indication becomes 00 RECALIBRATE ii Loosen th...

Page 166: ...annel to TP4 or TP5 Pre amp Apply positive trigger by TP1 Oscilloscope range The 1st channel DC mode 2V 50 sec The 2nd channel AC mode O 5V 50 sec b Install an alignment disk and start the spindle mot...

Page 167: ...st the index sensor Ass y position according to the following procedure i Loosen the fixing screws see Fig 43S of the PCBA front OPT H and adjust its position to make the true value of the index burst...

Page 168: ...PCBA front OPT fixing screws direction of sensor front OPT H Index sensor Fig 435 Adjustment of index sensor 4107...

Page 169: ...owing operation 48tpi FD 55AV BV Key in C2 01 and confirm that the TRACK indication becomes 01 96tpi FD 55EV FV GV Key in C2 02 and confirm that the TRACK indication becomes 02 g Key in E6 INDEX TIMIN...

Page 170: ...dication under execution of item g shows the median value in the specified range of item h ii Repeat the adjustment so that the DATA indication takes the median value when the fixing screw has been ti...

Page 171: ...screwdriver small size 3 A pair of tweezers 4 Alcohol and gauze 5 Locking paint 6 Oil FLOIL 946P 7 SK or user s system 8 Required equipment for each referring item B Replacement procedure 1 Disconnect...

Page 172: ...e arrow mark in Fig 436 using a pair of tweezers and make the locking paint 2 and 3 free Then remove the belt spring from the spring guide of the carriage 6 Place the FDD so that the top side comes up...

Page 173: ...y the steel belt and the belt spring should be replaced with the head carriage However if there is no inferior points for these belt and spring they may be used after cleaning the surface carefully wi...

Page 174: ...rance is considered to be the best 12 After finishing the installation of the carriage loosen the screw which fixes the steel belt to the capstan temporarily 13 Confirm that the steel belt runs on the...

Page 175: ...4 18 In the reverse order of items 1 and 2 install the set arm and the head cable Refer to item 4 2 3 as to the head cable treatment 19 Adjust the set arm position according to item 4 4 1 20 Model wit...

Page 176: ...item 4 4 13 26 Check the track 00 stopper according to item 4 4 14 27 Check or adjust the index burst timing according to item 4 4 15 28 Check the read level according to item 4 4 10 29 Check the res...

Page 177: ...Stepping motor capstan Fig 438 Replacement of head carriage Ass y 4116 carriage ASs y Guide shafts...

Page 178: ...wo fixing screws connecting the head carriage Table 504 No 22a and the steel belt A Table 504 No 22c and remove the steel belt and the belt spring Table 504 No 22d from the carriage 4 Remove three scr...

Page 179: ...tightened with looseness for temporarily fixing Note 4 When replacing the head carriage Ass y replace the two guide shafts at the same time because of matching the respective hole diameter of the carr...

Page 180: ...with oil 7 If the head carriage or the head piece is smeared with oil wipe it out completely by such a cotton swab dipped with alcohol 13 Make the head carriage move manually several times to spread t...

Page 181: ...tem 4 4 9 20 Adjust the track lignment according to item 4 4 12 21 Loosen the fixing screw Table 504 SlO of the track 00 stopper Table 504 No 22e to shift the stopper toward the rear side of the FDD 2...

Page 182: ...rriage refer to Table 505 Remove the steel belt Table 505 No 23c and the belt spring Table 505 No 23d according to item 4 5 1 1 3 through 6 b L type carriage refer to Table 504 Remove two screws Table...

Page 183: ...he stepping motor in item 7 according to the reverse order of items 1 through 4 Note 3 For a V type carriage install the belt spring at the bottom side first and hook the steel belt to the belt hook 1...

Page 184: ...not meander nor undulate When the SKA is used key in lC6 for this check and key in F for stop If there is some abnormal running of the steel belt readjust the belt with screws in item 9 After the adju...

Page 185: ...y in the reverse order Note The spindle area of the DO motor clamping cup of the disk is precisely machined For installing the motor to the frame place the spindle in parallel to the frame and push i...

Page 186: ...onal speed according to item 4 4 6 8 Adjust the track alignment according to item 4 4 12 9 Check or adjust the track 00 sensor position according to item 4 4 13 10 Check the track 00 stopper according...

Page 187: ...505 58 2 Remove the E ring Fig 505 512 which fixes the collet Ass y Fig SOS No 9 to the set arm and remove the collet and the pressure spring Pig S05 No IO 3 Install a new collet Ass y in the reverse...

Page 188: ...om the connector housing referring to item 4 2 2 4 3 Remove two fixing screws Fig 505 S2 to remove the head load solenoid Ass y Fig 505 No 20 4 Install a new head load solenoid Ass y in the reverse or...

Page 189: ...ead wire Red pin 2 Solenoid lead wire White pin 1 Black pin 6 Grey pin 5 Polarizing key position pin 3 Fig 440 Color identification of connector J4 wiring Arm lifter Head load solenoid Ass y Head prot...

Page 190: ...solenoid pins terminal Nos l and 2 from the connector housin9 referring to item 4 2 2 4 3 Remove the fixing screw Fig 505 56 to remove the PCBA TOO sensor H Fig 50S No 19 4 Install a new PCBA TOO sens...

Page 191: ...PCBA by removing the three fixing screws Fig 505 53 3 Install a new PCBA in the reverse order 4 Set the straps and terminator as they were on the old PCBA 5 Check the file protect sensor according to...

Page 192: ...12 It is recommended to connect the FDD to the system for overall test Refer to items 4 2 5 7 for window margin test 4131...

Page 193: ...B Replacement procedure 1 Disconnect PCBA front OPT H connector J5J 2 Remove the two fixing screws Fig 505 57 to remove the PCBA 3 Install a new PCBA in the reverse order 4 Check the file protect sen...

Page 194: ...2 Remove the fixing screws Fig 505 S8 of the front bezel Ass y Fig 505 No 3l and draw the front bezel out 3 Install a new front bezel Ass y in the reverse order For the installation of the front bezel...

Page 195: ...quired equipment for each referring item B Replacement procedure l Draw out the front lever ASs y Fig SOS No 32 2 Insert a new front lever Ass y fully against the lever shaft as it was 3 Check or adju...

Page 196: ...e fixing screw Fig 50S S2 to remove the CSS Ass y Fig 505 No 2l from the frame 2 Install a new CSS Ass y in the reverse order Be careful to install the arm lifter area 2mm rod to be in pa allel to the...

Page 197: ...Lift up the pad arm manually and peel the pad carefully with a pair of tweezers Se Fiq 443 2 Apply a new pad to the original position Do not press the pad surface strongly 3 Check or clean the magneti...

Page 198: ...Pad Pad arm Head carriage Ass y single sided Fig 443 Replacement of head pad 4137...

Page 199: ...y Z I SA 3 2 0 T p T R I A L0 l 3 m 2 t I f _ _ _ _ 1 oooi i Oe I L0 Lm _ J __ __ 1 I I I I I I I _ _ i _ KHEAO LOAO SOLE OIO i J RACK OO L ____ __ _s_ _ _ _ J _ _ I I i I_ rn ___ I STEil HG OTOII ASS...

Page 200: ...I ASS v I1 4 IlEADY 00 CP 01 00 F 32 0 SItE css IX SIt AS5 Y OO I1 34 1DJl Q 0 iE 12 00 rx oo 0 E I 51 lEAD 1i1 II ASS V 11 SItE II II ASS V B 11 0 SlOE II I1 34 READY 01 00 G 33 51 lEAD 11 34 Rf AOr...

Page 201: ...IIAlS Iof 1 00fT1lOl F1ltNT CPT FDD PCIllA YE_SIOIIS YEllS IONS IIAIII SPEC II PAIITS lIlI S I GIIAlS Iof 1 00fTIl0l F1lOIT CPT X j 552CL 3 _ 3D QCl13A_ _ P N 19307200 XX 1 lol411Ids9 i I I I I I t II...

Page 202: ...PIN 15532060 00 07 12 13 22 lii o a ISSUf A E r r r t r t t t t t TEAC of 1 t J t tt 1 0 t rl r ij IT hil P7 k d L JdZ4 lit F 0 5 5 V _ _ tt t t i 7 t I 1 w r J l lCD t y 4 CD _r __ __ t to PCBA MFD C...

Page 203: ...y 1 OV GBUI 13 r I 16SlY lPWtO 0 0 0 0 c 43 I Cli 0 il21 0 51 Pl I Ul 1 4 1 C 42 illAIl 5V It lB 411 I I I 5 6Ir IT tl D ao J RO AI3HF III I 3 Ov GNO OC 4 0 I I SY II I G I _ _ 14 1 US DC JI IIA lSI 3...

Page 204: ...6IS 0tl R21221l1 17 3301 1181111 I RlI2 7d l ItOld 4211 11l12dOI lP12ltJOI RI313 tit I IIltIIOIll 1119ll0 11121U21 C18110001 1 C2117S1 1 C22117P C231 lOoP C2tllOOOPI C3Q O 0022 25vI C31l0 0022 25V C 2...

Page 205: ...8tp I 1I11111 1l22C 1 IlEV A O 5 I DE THE OTHEIlS AAE TIE s E AS oe IIEV A I l II ltp I 1I11111 1l221 1 IlEV I D S I DE IPCB ISU E 15 usm I j I THE 0THEIlS AAE TIE SMo AS oe IIEV C 12 IIII lEL TE 1 1...

Page 206: ...IIC l_ r I 51 t ttL r l 1 1 91 JJ ltf FH t I I I Ell ilIll II B lilt L _ II Jf I IL 7 o I J R_ 1lIJ1 all aD 96 2 old _It 4fi I l 0 4 T 6 E___________ II c tl rrm v 11 DH 051 _ OSl I 511 I I tlZ i I I...

Page 207: ...DE G ST 0 lEV 0 05 III tP I 0 51 DE 0 510 OSV 2 Ll 3lh HI 1 o r C I I C2 I c CU 2 10 25V 1 U flV to DUlSOV t 1 1 OV 3 CI J C T C CG Cl0 C2 i 100 I T 22 10Y10 022Z50Y L2 3 HIe 12V OV OV 5V DC POWEll I...

Page 208: ...E AS Dt DELETI Cltl CltAt CltAl IAII XTISl IIlIlEU EtISZPI EZIIl SHOIT IIA EO tilE OTIIEIS AIlE Till lAME AS n I zt IIttl lAlli III U IllIUIl C341120DP In I IIU DsOI nS 1 5l D srDf fOC ol SII 11 Iltol...

Page 209: ...5 SIGULS ITH DOUIlE ASTElISUlaal alE usn II SOllIE OPTIOUL FOO VElSlOIlS IEFU TO FO 55 TOTAL DIAGUM AID IT s ElSIOI TAILE POlUllIIIG lEY POSlTlOII FOil COIIIIECTOI 5 IS 2 3 CAPACTOIIICI VALUES alE II...

Page 210: ..._ f OIEEII lEO LEO 52 I P N 15532048 FD 55Y It t 1IT1l lDX YIl r l1l 1 PCBA FRONT OPT IH SCHEMATIC TB E _____ II I I I I 101411108991 iXiJ I 1 1 IHIG A VERS ION TABLE It IliIl 7 3D _ TEAC7 Y f 4 I t...

Page 211: ...300 ffi rfJ w HlJ 1 1 5 LlJ t 8li ffj 0298 24 2865Htl ffi 8 ph 564 0R l1J rfJ 7J HlT 3 34 10 83 7 l 06 384 6 0 4 1 HtJ i c5 8 Ph 464 6 mf HdR tlli 3 2 3 83 1 6 052 782 4 5 8 1 ft It 8 ph 733 rz m t l...