Teac FD-55 Series Maintenance Manual Download Page 28

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3-2-3. Servo Circuit

The servo circuit aims to maintain the rotational speed of the spindle

motor at 300rpm (or 360rpm),

and the circuit is mounted on the PCBA

assembled with the spindle motor.

Start and stop of the spindle motor (DD motor Ass 'y) is controlled by

the MOTOR ON signal supplied through the spindle motor gate in the

control circuit.

The spindle motor is a long life VC brushless motor having 2-phase or

3-phase coils and bi-polar drive system.

The coils are driven by the

exclusive drive IC.

Energization and magnetized direction of t.he coils

are controlled by the signal from the hall elements mounted on the PCBA

around the rotor so that bhey. are changed corresponding to bhe designated

rotational direction.

The rotational speed is maintained stably and precisely.

The feedback

signal from the AC tacho-meter in the rotor is converted into the drive

yoltage (F-V conversion) by servo IC, and supplied to the drive IC

through the phase compensation circuit.

Several manufacturers’

spindle motors are used in FD-55 series for the

stable supply of the motor.

Though these motors are almost the same

in the function and performance, they are different in external view

because of a little difference in t*he servo circuit, etc.

321

Summary of Contents for FD-55 Series

Page 1: ...TEAC FD 55 L MINI FLEXIBLE DISK DRIVE MAINTENANCE MANUAL ELEKTRONIK n b n ELEKTRONIK GMBH Gewerbegebiet 8036 Herrsching Tel 081 52 390 Telex 5 26458...

Page 2: ...Density bpi 2768 5536 2938 5876 2788 5576 2961 5922 4 935 9 870 Inside Track Flux Density frpi 5536 5876 5576 5922 9870 Surface 2 1 2 2 Track Density tpi 48 96 96 Tracks Disk 40 80 80 160 160 Track Ra...

Page 3: ...ral Block Diagram 301 3 1 2 Mechanical Section 302 3 2 CIRCUIT DESCRIPTIONS 307 3 2 1 Read Write Circuit 307 3 2 2 Control Circuit 315 3 2 3 Servo Circuit 321 3 3 FONCTION OF TEST POINTS AND VARIABLE...

Page 4: ...Level disk calibration 402 8 4 2 4 5 Alignment disk calibration 4030 4 2 4 6 Humidity setting 4033 4 2 4 7 Setting of SKA gain v 4033 4 2 5 Others 4034 4 3 PREVENTIVE MAINTENANCE 4038 4 3 1 Cleaning...

Page 5: ...PARTS REPLACEMENT 2 Ci 4118 4 5 1 Replacement of Head Carriage Ass y 4118 4 5 2 Replacement of Stepping Motor Ass y 4122 4 5 3 Replacement of DD motor Ass1y Spindle Motor 4124 4 5 4 Replacement of Co...

Page 6: ...CONFIGURATION 501 5 2 MECHANICAL BREAK DOWN AND PARTS LIST 507 5 2 1 FDD 507 5 2 2 Screw Washer 512 5 3 PCBA PARTS LIST 513 5 3 1 PCBA MFD Control 514 5 3 2 PCBA Front O P T 520 5 4 SCHEMATIC DIAGRAM...

Page 7: ...SECTION 3 THEORY OF OPERATION 300...

Page 8: ...3 1 CONSTRUCTION AND FUNCTION 3 1 1 General Block Diagram Fig 301 General block diagram 301...

Page 9: ...ng the various mechanisms and printed circuit boards The frame is made of aluminum die cast to maintain the stability of the FDD in strength precision durability and expansion coefficient 2 Door mecha...

Page 10: ...External view of magnetic head core For single sided FDDs the external view of the magnetic head is button shaped and it is mounted on the carriage so that it is in contact with the SIDE 0 the buttom...

Page 11: ...ded FDD In the CSS model the magnetic head is always in contact with a disk as far as the disk is installed In order to elongate the disk and head lives it is required to make the disk rotate only whe...

Page 12: ...a File protect detection mechanism This mechanism is constructed with an LED and a photo transistor to detect the existence of the write enable notch of the disk jacket When a disk with the notch cove...

Page 13: ...ft against the head window edge of the disk In order to recalibrate the track from this position returning operation to the track 00 it is required to input the step out commands with several addition...

Page 14: ...vo circuit Read write circuit and control circuit are mounted on the PCBA MFD control and servo circuit is on the PCBA DD motor servo 3 2 1 Read Write Circuit The read write circuit is constructed wit...

Page 15: ...coil Low pas Differentiation filter amp I d Q H t f l H c n LVS SIDE ONE SELECT Write gate Erase gate WRITE DATA 308 Fig 303 Read write circuit block diagram...

Page 16: ...ier phase shifts the peak position of fhe reproduced waveform to the zero cross point and at the same time further amplifies the signal about 20dB with the most appropriate equalization The peak detec...

Page 17: ...Magnetization on disk Pre amp output TP7 Shoulder 5V approx Saddle Fig 304 Read amp and peak detector waveforms 310...

Page 18: ...utput in U9 2 4ps delay S S output in U9 i f i i j t n n JLJLJl 2 4ysiapprox n Data latch output in U9 Edge detector 2 output in U9 n n r t i n _ _ _ii Read data RD TP5 U7 pin 6 n n n n_ 1 ys approx U...

Page 19: ...gate output is supplied to the common terminal of the head through the diode switch Table 301 shows the output voltage of the write power gate in various operations Conditions Write power gate output...

Page 20: ...ulse is latched by the data latch And appropriate write current is supplied to the read write bead by turning on and off the two write drivers alternately When the write driver is active no read data...

Page 21: ...nsor is ANDed to all the output drivers of the FDD Therefore in the unstable state of 5V and 12V powfer when the internal logic of the FDD does not function normally it protects erroneous operations o...

Page 22: ...e motor gate to determine the rotational condition of the spindle motor write erase gate to control the actual write operation etc The detectors are index sector detector track 00 detector file protec...

Page 23: ...Fig 308 Control circuit block diagram 316...

Page 24: ...ct of the head loading the stepping motor is also over driven After the completion of the over driving both the head load solenoid and the stepping motor are maintained by 5V power to minimize the pow...

Page 25: ...DIRECTION SELECT signal at every input of the STEP pulses The internal step pulse generator is constructed with a counter and a pulse generator The counter is triggered at the trailing edge of the STE...

Page 26: ...The output from the internal step pulse generator is also supplied to the over drive timer constructed with a re triggerable counter During the active period of this timer 75msec approx 12V power is s...

Page 27: ...tion ttr Motor driver inputs PHASE A U8 pin 4 PHASE B U8 gpin 5 TP3 PHASE 3 U8 rpin 6 PHASE B U8 pin 7 96tpi FDD internal step pulse gen output in U6 Overdrive timer output U6 pin 19 Motor driver inpu...

Page 28: ...magnetized direction of t he coils are controlled by the signal from the hall elements mounted on the PCBA around the rotor so that bhey are changed corresponding to bhe designated rotational directi...

Page 29: ...sition of the test points and variable resistors Notes 1 Some versions or some revision numbers of the PCBA MFD control B have not the variable resistor R5 2 Some types of DD motor Ass y have not the...

Page 30: ...ss than 0 5V at track 02 48tpi or track 04 96tpi TPl Track 00 sensor 3 0V Min 0 5V Max Track 02 04 and greater track Track 00 Fig 312 Typical waveform of TPl Note The TRACK 00 output signal goes TRUE...

Page 31: ...DD It is also used for all the FDDs as the observation point of the partial 2 phase magnetization timing of the stepping motor For the 48tpi FDD the stepping motor rotates for 2 steps in response to o...

Page 32: ...fter inverting the level by the Schmitt inverter The signal level at this TP is opposite bo that of the INDEX output signal When the index hole or sector hole hard sectored disk is detected HIGH going...

Page 33: ...y of the ceramic oscillator mounted on the PCBA DD motor servo b Confirmation and adjustment of the index burst timing Burst timing is adjusted by the fixing screws of the PCBA front OPT TP4 Index n J...

Page 34: ...hile 2F 4 3F and IF intervals are observed in the MFM method Items FD 55A a p FD 55G 2F interval 4ys Norn 2ys Nom 4 3F interval 6ys Nom 3ys Nom IF interval 8ys Norn 4ys Nom Pulse width l 0 5ys 0 5 0 2...

Page 35: ...ile 2F 4 3F and IF intervals are observed in the MFM method Items FD 55A a p FD 55G 2F interval 4ps Norn 2ys Norn 4 3F interval 6ys Uom 3ys Nom IF interval 8ys Norn 4ys Norn Pulse width l 0 5ys 0 5 0...

Page 36: ...eral dozen to several hundred mVp p and they differ in phase by 180 opposite phase Both outputs are observed at TP7 and TP8 respectively For an accurate observation of the read waveforms use two chann...

Page 37: ...and Add mode of both channels r Use G 0V test point for the oscilloscope ground TP9 and TP10 are used for checking the total operation of the xead write head and the read amplifier and for the check a...

Page 38: ...trained technicians 1 Rl on PCBA DD motor servo Disk rotational speed adjustment Variable resistor for adjusting the rotational speed of the disk It is adjusted so that the index pulse interval at TP...

Page 39: ...r a double sided FDD repeat this operation alternately for side 0 and side 1 heads to obtain the minimum asymmetry for both sides TP5 Read data Asymmetry 0 3 JT_ Trigger 3 JT Asymmetry FD 55A F FD 55G...

Page 40: ...SECTION 4 MAINTENANCE 4000...

Page 41: ...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 42: ...nce Check and adjustment should be done when required during replacement of the maintenance parts or during trouble shooting referring to items 4 2 and 4 3 The numbered procedure in Table 402 shows a...

Page 43: ...s 4 4 6 7 Check and adjustment of disk rotational speed 5 minutes 4 4 7 8 Check of erase gate delay 5 minutes 4 4 8 9 Check and adjustment of head touch 5 minutes 4 4 9 10 Check and adjustment of asym...

Page 44: ...s without brackets are used at the shipment though parts with brackets may be used since they are interchangeable as spare parts 2 Since the parts number versions of the PCBA MFD control B and the PCB...

Page 45: ...angeable aach other The head load solenoid Ass y of the listed parts number in this manual need not adjustment of head protector Therefore the explanation for it is deleted from this manual 8 The part...

Page 46: ...o P o O I O 1 O 1 V r un un I o 0 2 1 O l 1 O 1 LO 1 CO l O 1 1 en 1 O i un p o I 1 0 0 i H uP o m O un o o O O o en C D T o u CM o u 0 0 0 0 o O 0 0 0 0 k o H up O o CM CM m 0 up up uP CM P uo uO up...

Page 47: ...o o O rp O o O o X r r un un O 1 Z 1 rp i o 1 1 LO 1 CD 1 O 1 I en 1 en 1 un rp 1 O i 1 00 I O r r r cO O m en un o o C T o O o P C T o P N O r P o o 00 o T CD 00 a P cO r 0 Csl cm m 0 CD CD CD N v P...

Page 48: ...L o o rH 0 2 o o o 0 1 O I O 1 0 1 o r in in 1 O 1 C M 1 o i in 1 CO o I cn 1 m rH 1 O r 1 2 1 d d 2 o cn m o o on O O cn to 2 O C N o r C O CO o n CO CO iD 4J 2 an CN C N cn 2 ID ID C M rH ID vO ID H...

Page 49: ...z 1 1 O 1 t n 1 C D 5 o 1 c o 1 e n t t n H c 1 I C D o e n r vO o C O e n u o o O e n o O o e n O N o r c o c o o O 0 0 c o e n Vu v O n C N C N r o V O V O vo CN rH k D V O vo d v D V O t n o c o vO...

Page 50: ...cn I 0 3 i n 1 rH 1 o 9 r CO p 0 o cn 0 1 0 o O o O o C O j o C M o C 0 0 a o O O i C O GO 4 1 0 O C M C N e n 0 0 0 C M rH 0 0 V 4 0 1 0 0 3 0 3 m 0 0 0 cn cn 0 0 r d O cn p 0 3 0 3 O i 0 m O O i U...

Page 51: ...A the accessories are supplied with the SKA i SKA FFD interface cable 00 ii Check cable 1 for observation of control signals iii Check cable 2 for observation of read amp output signals iv SKA FDD pow...

Page 52: ...lder and soldering iron h Cutter knife 3 Special jigs a Max media jig Jig C P N 1789Q746 00 b Alignment adjustment jig P N 17851100 00 4 Disks a Work disk commercially available disk b Cleaning disk c...

Page 53: ...isk P N 14900015 00 5 Other articles used during maintenance a Absolute alcohol Ethanol __ __ ___ b Cotton swab or gauze L L c Locking paint 3 Bond 1401B d Screws and washers Refer to item 5 2 2 Note...

Page 54: ...screws for adjustment and parts replacement the following procedure should be followed 1 For adjustment remove out the set screw and also remove the locking paint which had applied to the screw itsel...

Page 55: ...connector Option Door close switch connector or HD sensor connector Option PCBA VFO OPT connector Option Door lock solenoid connector 2 Connection and disconnection of the connectors Be sure to turn...

Page 56: ...J4 J12 Option J9 J5 Top view of the FDD Fig 401 Types of connectors 4016...

Page 57: ...ctor into the post pin on the PCBA with the housing clamper up For the connector Jll option bring the hole of the pin onto the post pin position and push it It will not be pushed in an opposite locati...

Page 58: ...that the stopper faces the opening side of the housing After the insertion check the connection by pulling the cable lightly 4 Precautions for handling the black connectors J4 J5 J9 J1Q Jll a Disconn...

Page 59: ...using with a narrow object such as cutter knife pull the cable with a pair of tweezers in the direction indicated by the arrow Refer to Fig 404 Fig 404 Sectional view of black connectors d Insertion o...

Page 60: ...able with cable clamper B so that the cable has appropriate looseness when the head carriage is set to track 00 rear end of the moving area The appropriate length of the head cable from the head carri...

Page 61: ...2 Form the cable not to have excessive looseness in the area from the head connector to the cable clamper B 4021...

Page 62: ...prox 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 4 Connect the FD PWR OUTPUT of the SKA and the F...

Page 63: ...5P connectors at both ends between the terminals 6 9 G of the SKA and TP7 TP10 G of the FDD Be sure to match the pin numbers of the connector housing and the terminal numbers of the SKA as in Fig 407...

Page 64: ...the DATA indicator of the SKA I IJ I 1 V indicates the value within the range of 12 0010 24V 14 Key in F STOP Note The above items 1 2 9 14 may be omitted for replacement of the FDD or a temporary FDD...

Page 65: ...ions The initial setting of the following is not required if the maximum track number is the same as the initial value 79 of the SKA 1 Key in HCF SET TMAX 2 The maximum track number set at that time i...

Page 66: ...Step rate set at that time is indicated by 0 1msec scale on the DATA indicator DLLJ_ ms e g DATA indicator CDS21 indicates 6 0msec 3 Key in a new step rate down to one decimal place unit msec Notei I...

Page 67: ...7 Depress F key STOP Setting of the settling time completes e g 48tpi FDD DB 60 F 150 F Step rate 6msec settling time 15msec 96tpi FDD DB 30 F 150 F Step rate 3msec settling time 15msec 4027...

Page 68: ...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 69: ...d Key in F STOP Note If there is no calibration change in item b omit itewi c and depress F key e g READ LEVEL 103 RESOLUTION 96 DO 103 F D1 96 F 4029...

Page 70: ...t required 1 SIDE 0 alignment a Key in E0 CALIBRATION SIDE 0 ALIGNMENT b The calibration value set at the time is indicated in the latter two digits of the DATA indicator D TXTJ and the polarity is in...

Page 71: ...Calibration of alignment lobe pattern 3 Index burst timing a Key in HE5 CALIBRATION INDEX TIMING b The calibration value set at that time is indicated in the latter three digits of the DATA indicator...

Page 72: ...is recommended to set the following straps on when you use the SKA However if you can set the straps correctly referring to Specification Instruction Manual Schematic diagrams and SKA Instruction Manu...

Page 73: ...a For the observation at the test points TP 7 a 10 Connect the probe ground to the G test point 0V on the PCBA MFD control b For the observation at the other test point Connect the probe ground to the...

Page 74: ...clean environment 6 Orientation of the FDD Position the FDD as shown in Fig 410 unless otherwise specified Horizontal and vertical orientations with lever side up should be used Horizontal setting Le...

Page 75: ...d adjustment of the high density FDD it is required to use a high density disk HD disk as a work disk or as the level disk The high density disks look more transparent when viewed through than the ord...

Page 76: ...disk 2 SKA or user s system B Cleaning procedure 1 General method a Start the spindle motor and install an appropriate cleaning disk Notes 1 Do not use a damaged cleaning disk on the surface 2 For a s...

Page 77: ...long 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 PD PWR switch to the P...

Page 78: ...cleaning 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 411 and cle...

Page 79: ...Pad Pad arm Set arm lifter Magnetic head surface Head carriage Fig 411 Direct cleaning of he magnetic head Single sided only 4041...

Page 80: ...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 visual distance of the gap between the collet shaft and the set ar...

Page 81: ...Collet shaft Front lever Gap between collet shaft and set arm hole Fig 412 Adjustment of set arm position 4043...

Page 82: ...then tighten the four screws at both sides Narrow gap should be confirmed by a very easy manual turning of the E ring 4 Install a work disk 5 Start_the spindle motor and confirm that the disk rotates...

Page 83: ...gainst the frame at item 3 Then execute the procedure from item 4 through 7 again 9 Eject the work disk 10 Adjust the front lever position according to item 4 4 3 Fig 413 Adjustment of clamp arm posit...

Page 84: ...rt the MAX media jig from the notch side See Fig 414 5 Turn the front lever to close position and loosen the lever fixing screw again Then push the lever against the MAX media jig 6 Position the handl...

Page 85: ...Note Refer to item 4 2 1 as to handling of the set screws Fig 414 Adjustment of front lever Fig 415 Front lever position 4047...

Page 86: ...ch key 1 5mm 2 Work disk 3 SKA or user s system 4 Oscilloscope 5 Locking paint B Adjustment procedure 1 General method a Start the spindle motor and insert a work disk b Set the head to track 00 c Exe...

Page 87: ...Fig 416 Adjustment of arm lifter Note Viewed from front bezel side Fig 417 Gap of arm lifter 4049...

Page 88: ...HM and SM straps on Use either of the DRIVE SELECT signal or the IN_USE HEAD LOAD signal See the Specification item 1 12 3 h Select the side 1 head i Execute head loading j Execute 2F write operation...

Page 89: ...screw of the arm lifter v Note This item should be executed when the side 1 head is selected If the side 1 head is lifted too high during unload operation spike noise will be observed while unload le...

Page 90: ...ing the side 0 head r Again set the head to track 00 s After opening the front lever draw out the disk slowly In the process of drawing out the side 0 and side 1 heads shall not catch the head window...

Page 91: ...Replace the head load solenoid Ass y according to item 4 5 5 iv Inferior PCBA MFD control Replace the PCBA MFD control according to item 4 5 7 No relation to items s and t Note Refer to item 4 2 1 as...

Page 92: ...rm and the arm lifter becomes 0 2mm Min See Figs 416 and 417 g Release the drive select by key 0 DSO indicator turns off h Confirm that the upper arm is lifted slightly by the arm lifter i Use two cha...

Page 93: ...oad level excludes the noise level as shown by dotted line in Fig 419 In such event that either of the spike noise or continuous unload level is observed in the waveform fine adjust the set screw of t...

Page 94: ...irm in the same procedure of items L through u for the side 0 head w Key in CO and confirm that the TRACK indication Becomes 00 RECALIBRATE x After opening the front lever draw out the disk slowly In...

Page 95: ...Note Refer to item 4 2 1 as to handling of the set screw 4057...

Page 96: ...sk b Set the head to track 00 c Execute head loading d Turn the adjusting screw set screw of the arm lifter so that the gap between the pad arm and the arm lifter becomes 0 2mm Min See Figs 416 and 41...

Page 97: ...j Repeat the procedure from item c to f Note Refer to item 4 2 1 as to handling of the set screw 4059...

Page 98: ...rn the adjusting screw set screw of the arm lifter so that the gap between the pad arm and the arm lifter becomes 0 2mm Min See Figs 416 and 417 g Release the drive select by key 0 DSO indicator turns...

Page 99: ...no insertion of a disk b Confirm that the side 1 head is lifted even if the front lever is close and It has enough gap against the side 0 head See Fig 420 rSide 1 head Gap Side 0 head Fig 420 Gap bet...

Page 100: ...side Of the head carriage moves as in Fig 421 by opening closing of the front lever and insertion ejection of the disk i Disk is not fully inserted ii Disk is fully inserted and front lever is close F...

Page 101: ...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 to the left side...

Page 102: ...k Key in Cl SET TMAX L Confirm as in item j 4064...

Page 103: ...ll the MAX media jig from the notch side and set it so that the notch A area is located on the light pass from the file protect sensor LED See Fig 422 d Adjust the orientation of the FDD so that it is...

Page 104: ...Notch B position TP6 voltage 0 5V Max LED indicator Fig 422 Check of file protect sensor 4066...

Page 105: ...h to the PSA side b Execute the general method described in item l a through e WRROT indicator of the SKA turns on when drive selection is executed by key 0 DSO indicator turns on v c Execute the gene...

Page 106: ...oscillator in the servo circuit and no adjustment is required A Equipment 1 Common screwdriver small size 2 SKA or user s system 3 Frequency counter not required when the SKA is used 4 Work disk soft...

Page 107: ...f If the value in item e is out of the specified range adjust the variable resistor Rl on the PCBA DD motor servo to obtain the median value in the specified range in item e 4069...

Page 108: ...indicator turns on e Key in CO and confirm that TRACK indication becomes 00 RECALIBRATE f Key in C3 L INDEX PERIOD g Confirm that the DATA indicator L I IJ mindicates a value within the following rang...

Page 109: ...the other channel to TP2 Erase gate delay on the PCBA MFD control Oscilloscope range For both channels DC mode 5V lOOysec b Start the spindle motor and install a work disk c Execute head loading d Set...

Page 110: ...y Fig 423 Erase on delay g Confirm that t Erase off delay in Fig 424 is within the following range t Erase off delay 860 950ysec FD 55A F 500 550ysec FD 55G WRITE GATE TP2 Erase gate ______ t________...

Page 111: ...in H7 WRITE GATE ON d Confirm that the DATA indicator I i 1 11 us shows a value within the following range Erase on delay 200 v 320ysec FD 55A v F 175 v 210ysec FD 55G e Key in 7M again WRITE GATE OF...

Page 112: ...neral method a Connect an oscilloscope to TP9 or TP10 Differentiation amp on the PCBA MFD control Oscilloscope range 48tpi AC mode 0 2V 96tpi AC mode 0 1V b Start the spindle motor and install a work...

Page 113: ...side of the head pad by 30 steps approx with a common screwdriver see Fig 425 At each turning of the groove execute write and read operations in item e Be sure to take apart the common screwdriver fr...

Page 114: ...le motor might be overloaded because of increasing the rotation torque If item Q is done measure the 12V current consumption of the FDD and confirm that the current does not exceed 300mA by an DC clip...

Page 115: ...t head load solenoid the flexture on which the head piece is located may be deformed Remove the disk Then open and close the front lever slowly to observe the gap between the side 1 and side 0 heads f...

Page 116: ...TP7 and TP8 Pre amp after each cycle of operation one rotation of write and one rotation of read is finished g Observe the DATA indicator I M l l mV with a slight depression very slight depression eas...

Page 117: ...tion in item k iii Caution should be as follows i Stop all the commands already input by depressing F key ii Key in DF 12V CURRENT iii Measure the 12V current consumption at that time by the DATA indi...

Page 118: ...he spindle motor and install a work disk c Set the head to the innermost track d Execute head loading e Execute IF write operation 125KHr of WRITE DATA frequency for FD 55A F 250KHr for FD 55G f Measu...

Page 119: ...can be done without H5 i Adjust the variable resistor R5 so that the asymmetry takes the minimum value while repeating IF write and IF read operations alternately ii For a double sided FDD repeat the...

Page 120: ...tube magnetized iron plate etc take it apart from the FDD Then measure the asymmetry and adjust again ii Inferior disk Replace the work disk iii Inferior head Replace the head carriage Ass1y accordin...

Page 121: ...0 2ysec FD 55G IX mode 2V O iysec d Start the spindle motor by key 5 MON indicator turns on e Install a work disk f Execute drive select by key 0 DSO indicator turns on g Key in CO and confirm that t...

Page 122: ...the PCBA versions or the PCBA revision numbers with the variable resistor R5 on the PCBA MFD control No adjustment can be done without R5 i Adjust the variable resistor R5 so that the asymmetry takes...

Page 123: ...to the above range Set either of the channels to Invert mode and ADD both channels b Start the spindle motor and install a level disk c Make the head move to the innermost track d Execute head loadin...

Page 124: ...d side 1 heads respectively j If the value in item h or i is out of the specified range following causes are assumed i Inferior disk Disk and or jacket is deformed or damaged Replace the level disk wi...

Page 125: ...k Eject the level disk and release the Invert and ADD modes of the oscilloscope 4087...

Page 126: ...tion value of the level disk should be set previously in the SKA h Confirm that the DATA indicator I I I 1 1 mVo p indicates the value within the following range Innermost track read level 48tpi 700mV...

Page 127: ...et both channels 1 and 2 to the above range Set either of the channels to Invert mode and ADD both channels b Start the spindle motor and install a level disk r c Make the head move to the Innermost t...

Page 128: ...ouble sided FDD execute items e through j for side 0 and side 1 heads respectively L If the value in item j or k is out of the specified range following causes are assumed i Inferior disk Disk and or...

Page 129: ...Replace the PCBA MFD control according to item 4 5 7 m Eject the level disk and release the Invert and Add modes of the oscilloscope 4091...

Page 130: ...The calibration value of the level disk should be set previously in the SKA h Confirm that the DATA indicator 1 I I I I indicates the value within th following range Innermost track resolution 55 Min...

Page 131: ...and adjustment should be done after two hours Min of storing in the above mentioned condition It is recommended that the orientation of the FDD for the track alignment check is the same as when the FD...

Page 132: ...ove number of tracks to be stepped is required to make the alignment track position be fit with the magnetized condition of the basic magnetized phase A of the stepping motor If the stepped track numb...

Page 133: ...umidity 65 96tpi Misalignment true value Q rftA x 100 6 65 50 0 6 1 x 0 42 5 2 If the calculated value is positive the magnetic head is shifted inward from the reference position while the head is shi...

Page 134: ...ignment 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 u...

Page 135: ...the both misalignment take the smallest value v Tighten the two fixing screws of the stepping motor little by little for adjusting the true value of misalignment after tightening the screws with the...

Page 136: ...Fig 431 Adjustment track alignment 4098...

Page 137: ...5V 20msec c Key in B9F INDEX observation d Start the spindle motor by key M5 MON indicator burns on e Install an alignment disk f Execute drive select by key t 0M DSO indicator turns on g Key in CO a...

Page 138: ...e observed at the track of even number For a 96tpi FDD the lobe pattern should be observed at the track of multiple number of four 4 j For a 96tpi confirm that the H GAIN indicator of the SKA turns on...

Page 139: ...rew so that the DATA indicator f 1 1 H shows the smallest value The stepping motor moves little by little when the jig or the screw is turned iv For a double sided FDD repeat the adjusting operation d...

Page 140: ...cilloscope range DC mode IV bl Start the spindle motor and install a work disk c Execute head loading d Confirm that the voltage at TPl is within the following range when the head is set to track 00 T...

Page 141: ...es AC mode 0 2V 20msec iii Install an alignment disk The track alignment should be adjusted correctly according to item 4 4 13 iv Make the head move to the position where the lobe pattern as in Fig 43...

Page 142: ...position so that the values in items ix and x satisfy the specification when the screw has been tightened with the specified torque xii Apply a drop of locking paint on the fixing screw head xiii Adj...

Page 143: ...of J3 resistor network RA1 for terminator on the PCBA MFD control trigger c Key in MB8 F STEP observation d Start the spindle motor by key f 5M MON indicator turns on e Install a work disk f Execute...

Page 144: ...xternal trigger SKA DOUT TPl Track 00 sensor 48tpi FDD Step out Step in 1 2 3 4 5 1 2 3 4 5 i i i hiL______ LI 1 1 B L VH 1 tA tB 3ms m 3ms Track 00 detection SKA DOUT TPl Track 00 sensor 96tpi FDD 1...

Page 145: ...and change the trigger to this channel Oscilloscope range AC mode 0 2V 20msec iii Install an alignment disk The track alignment should be correctly adjusted according to item 4 4 13 iv Key in CO and...

Page 146: ...ments in item j are all satisfied xii Repeat the adjustment so that the values in item j fall within the specified range when the fixing screw has been tightened with the specified torque xiii Apply a...

Page 147: ...0 1 0 4mm See Pig 434 e Repeat step in and step out operations between track 00 and track 05 Confirm that no impact sound can be heard between the head carriage and the track 00 stopper f Turn off the...

Page 148: ...he stopper position so that the gap between the stopper and the head carriage becomes 0 25mm approx And then tighten the screw with the specified torque iv Execute items a through g v Apply a drop of...

Page 149: ...rm 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 v 0 4m...

Page 150: ...t the TRACK indicator becomes 00 RECALIBRATE ii Loosen the fixing screw of the track 00 stopper See Fig 434 iii Adjust the stopper position so that the gap between the stopper and the head carriage be...

Page 151: ...P7 or TP8 Pre amp Apply positive trigger by TP4 Oscilloscope range The 1st channel DC mode 2V 50ysec The 2nd channel 48tpi AC mode IV SOysec 96tpi AC mode 0 5V SOysec b Start the spindle motor and ins...

Page 152: ...adjust the index sensor Ass y position according to the following procedure i Loosen the fixing screws see Fig 436 of the PCBA front OPT and adjust its position to make the true value of the index bu...

Page 153: ...Fig 436 Adjustment of index sensor 4115...

Page 154: ...check track 48tpit Key in C2 01 and confirm that the TRACK indication becomes 0 1 96tpi Key in C2 02 and confirm that the TRACK indication becomes 02 g Key in E6 INDEX TIMING The calibration value of...

Page 155: ...tion 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 tightened with the specified tor...

Page 156: ...Fig 506 No 12 and shift lever Fig 506 No 14 on the set arm by removing their fixing screws Fig 506 Sll S3 3 Remove the set arm Fig 506 No 7 by removing the two fixing screws Fig 506 S6 4 Remove two sc...

Page 157: ...of head carriage Ass y loosen the screw Fig 506 Si which fixes the steel belt to the capstan of the stepping motor via the plate washer Fig 506 No 30 9 After moving the head carriage several tiroes m...

Page 158: ...crews carefully with the specified torque 18 Check and adjust the head touch according to item 4 4 9 19 Check and adjust the asymmetry according to item 4 4 10 Adjustment is applied only for the model...

Page 159: ...Head carriage Ass 1 Stepping motor capstan Guide shafts Fig 437 Replacement of head carriage Ass y 4121...

Page 160: ...spring Fig 506 No 29 from the carriage 4 Remove the two fixing screws Fig 506 S7 of the stepping motor Ass1y Fig 506 No 27 and remove the stepping motor with the steel belt 5 Remove screw Fig 506 Si...

Page 161: ...ixing screw Fig 506 S8 of the track 00 stopper Fig 506 No 4 to shift the stopper toward the rear side of the FDD 11 Make the head seek continuously between the track DO and the innermost track and con...

Page 162: ...nt the PCBA DD motor servo 5 Install a nev DD motor Ass y in the reverse order Notesr 1 Be sure to attach the spacer Fig 506 No 6 to the correct position Spacer is made of insulation material and if i...

Page 163: ...ust the set arm position according to item 4 4 1 8 Check and adjust the clamp arm position according to item 4 4 2 9 Check for the file protect sensor according to item 4 4 6 10 Adjust the disk rotati...

Page 164: ...Remove the E ring Fig 506 S15 which fixes the collet Ass y Fig 506 No 10 to the set arm and remove the collet and the spring Fig 506 No ll 4 Install a nev collet Ass y in the reverse order Pay attenti...

Page 165: ...housing referring to item 4 2 2f 4 3 Remove two fixing screws Fig 506 S3 to remove the bead load solenoid Ass y Fig 506 No 23 4 Install a new head load solenoid Ass y in the reverse border Note Arrang...

Page 166: ...Arm lifter Fig 438 Installation of the head load solenoid Ass y Fig 439 Color identification of connector J4 wiring 6 Check and adjust the arm lifter according to item 4 4 4 4128...

Page 167: ...rew Fig 506 S8 to remove the TOO sensor Ass y Fig 506 No 22 4 Install a new TOO sensor Ass y in the reverse order Note Arrange the wiring connection of the head load solenoid so that the white lead wi...

Page 168: ...a new PCBA MFD control in the reverse order 4 Set the straps and terminator as they were on the old PCBA 5 Check for the file protect sensor according to item 4 4 6 61 Check for the erase gate delay a...

Page 169: ...12 it is recommended to connect the FDD to the system for overall test Refer to item 4 2 5 1 4131...

Page 170: ...ont OPT connector J5 2 Remove the two fixing screws Fig 506 S20 to remove the PCBA 3 Install a new PCBA front OPT in the reverse order 4 Check for the file protect sensor according to item 4 4 6 5 Adj...

Page 171: ...up the pad arm manually and peel the pad carefully with a pair of tweezers See Fig 440 2 Apply a new pad to the initial position Be careful not to press the pad surface strongly 3 clean the magnetic h...

Page 172: ...Fig 440 Replacement of head pad 4134...

Page 173: ...open position and remove another Fixing set screw Then draw out the front lever Ass y Fig 506 Mo 37 3 Remove the fixing screws Fig 506 S 7 of the front bezel Ass y Fig 506 No 36 and draw the front be...

Page 174: ...se position and remove a fixing set screw Fig 506 S13 2 Turn the front lever to open position and remove another fixing set screw to draw out the front lever Ass y Fig 506 No 37 3 Install a new front...

Page 175: ...ift lever Fig 506 No 14 from the set arm 2 Remove the fixing screw Fig 506 S3 to remove the CSS Ass y Fig 506 No 39 from the frame 3 Install a new CSS Assly in the reverse order Be careful to install...

Page 176: ...Plate Fig 441 CSS Ass y and shift lever position 4138...

Page 177: ...SECTION 5 DRAWINGS PARTS LIST 500...

Page 178: ...y 1 Head load solenoid Ass y 2 Head protector Ass y 3 CSS Ass y Front bezel Ass y Front lever Ass y Head carriage Ass y PCBA MFD control PCBA front OFT 4 Optional assemblies Lever shaft Ass y Clamp a...

Page 179: ...r Fig 501 External view No l 502...

Page 180: ...r Ass y Index sensor LED DD motor Ass y fixing screws Head carriage Ass y Head protector Ass y or CSS Ass y Head load solenoid Ass y TOO sensor Ass y Head cable Stepping motor Ass y Note Refer to Tabl...

Page 181: ...PCBA DD motor servo Fig 503 External view No 3...

Page 182: ...Fig 504 External view No 4 505...

Page 183: ...Partis nrnnber of the FDD Fig 505 Extemal view No 5 506...

Page 184: ...F G 8 16786984 00 Felt pad 1 9A 16786984 00 Felt pad 1 9B 16787076 02 Disk pad 2 5t 1 Note 4fFD 55 L A E 10 17966793 00 Collet Ass y 1 11 16385123 00 Spring pressure 1 12 16802440 00 Plate 1 13 167869...

Page 185: ...769070 00 Stepping motor Ass y 1 FD 55 L A G Note 3 14769070 50 Stepping motor Ass y FD 55 L A B 28 16792265 00 Steel belt A 1 29 16392008 00 Springs belt 1 3Q 16496492 00 Washer plate 1 31 16802434 0...

Page 186: ...number of the lever shaft Ass y listed in the table is the standard length Optional lever shaft Ass y which length is different should be designated with other parts number 8 The head load solenoid A...

Page 187: ...Color Front bezel Ass y Front lever Ass y Beige 17966807 52 17966808 52 Gray G4 17966807 53 17966808 53 Gray G12 17966807 55 17966808 55 510...

Page 188: ...Fig 506 Mechanical section break down 511...

Page 189: ...rew pan three pieces 3x8 S9 16400304 Screw pan 3x4 S ZMC S10 16498296 Color screw 3x6 Plastic screw Sll 16420005 Screw flat 2 6x5 S ZMC S12 16420308 Screw flat 3x8 S ZMC S13 16498260 00 Setscrew 3x3 S...

Page 190: ...he PCBA versions Select either of them 2 Parts with a double asterisks are not used in some PCBA versions 3 Parts with a triple asterisks are different in quantity and location depending on the PCBA v...

Page 191: ...08 TTL IC 74LS74A Location 06 U9 U4 U7 03 U1 U2 U5 U10 13428129 Transistor array M54534P U8 13423122 or 13421211 13424279 or 13424286 Transistor 2SB 810 H F F or 2SA 881 Q R Transistor 2SC 2785 F F or...

Page 192: ...K J RA3 13497278 Resistor array SA 5 47K J RA4 13497287 Resistor array SC 4 2 2Ki J RA6 11982479 Resistor RN 1 4W 768ft F R17 11982497 Resistor RN l 4W l 24Kft F 11982508 Resistor RN l 4W 1 69Kft F 11...

Page 193: ...OyF M C12 C15 12903220 Capacitor CS 16V 33uF K 12903070 Capacitor CE 25V 22yF M C3 12903071 Capacitor CE 25V 47yF M C33 12902551 Capacitor CS 16V 2 2yF M C17 C6 12902553 Capacitor CS 16V 4 7yF M C35 C...

Page 194: ...1417 Capacitor CCy50V YB 1O00PF K 12901418 Capacitor CC 50V YB 1200PF K C31 12901421 Capacitor CC 50V YB 2200PF K 12901421 Capacitor CC 5OV YB 22OOPF K C29 C30 12901417 Capacitor CC 50V YB 1000PF K J...

Page 195: ...tor S6P 37 polarizing 1 J9 13121235 Connector W12P 74 polarizing 13121296 Connector S6P 39 polarizing 1 j5 13121297 Connector S8P 39 polarizing 13121191 Connector 6P S6B XH J6 13121189 Connector 4P S4...

Page 196: ...Parts Nos Parts name rating Location 13121149 Short bar HS MX UR RE PM DC1 v 4 straps 13000040 Plated wire 0 5 S 1 S18 16271169 XX Name plate Note 5 Table 504 PCBA MFD control parts list 6 6 519...

Page 197: ...CR52 13413020 Diode 1S953 CR51 13419160 LED GL 5HD5 LED51 13419161 LED GL 5NG6 13121236 Connector S3P 38 polarizing 11185151 Resistor RD 1 4W 1500 J R51 v R52 11186222 Resistor RD 1 5W 2 2Kft J R53 A...

Page 198: ...HEMATIC DIAGRAMS 1 Resistor R and resistor array RA values are in OHMs 1 8W 5 J unless otherwise specified 2 Capacitor C values are in Microfarads 50V 5 J unless otherwise specified 3 Tolerance symbol...

Page 199: ...PCBA DD MOTOR SERVO PARTS LOCATION Type S i 522A...

Page 200: ...PCBA DD TOR SERVO PARTS LOCATION Type TO 522B...

Page 201: ...PCBA DD MOTOR SERVO PARTS LOCATION Type G 522C...

Page 202: ...PCBA DD MOTOR SERVO PARTS LOCATION Type T 522D...

Page 203: ...55 3 on I537Q2 5 or P S W Q U j k I J U C o fc I 3 W J V o 6 V y f t 523A PCPA DD MOTOR SERVO SCHEMATIC Type S...

Page 204: ...523B PCBA DO MOTOR SERVO SCHEMATIC Type K...

Page 205: ...o 523C i 1 PACB DD HOTOR SERVO SCHEMATIC Type G...

Page 206: ...CV 5 3 3 H 2SV 523D PC DD M o t o r SERVO SCHEMATIC Type T...

Page 207: ...PCBA MFD CONTROL B PARTS LOCATION PCB ISSUE A G 524A...

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Page 209: ...PCBA FRONT OPT PARTS LOCATION 525 PO I...

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Teac FD-55 Series, Maintenance Manual

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