(L) Turn the FD PWR switch of the SKA off at the track 00 position and
then set it again to the PSA side. Confirm that the stop position
of the head carriage did not change at power off and on.
(m) If the value in item (j) or (L) is out of the specified range, adjust
the position of the track 00 sensor according to the Following
procedure.
i) Loosen the fixing screw of the track 00 stopper (see Fig.434) and
shift the stopper in the step-out direction (make apart from the
rear side of the head carriage),
ii) Connect the 2nd channel of the oscilloscope to TP9 or TP10
(Differentiation amp.) of the PCBA MFD control 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 confirm that the track indicator becomes '"00".
(RECALIBRATE).
v) Key in the following code and confirm that two lobe patterns as in
Fig.430 can be observed.
48tpi: C2 16
96tpi: C2 32
If normal lobe pattern cannot be observed, move the head to the
track position where the typical lobe pattern can be observed by
stepping in by key "8" or by stepping out by key ■"9".
vi) Remove the alignment disk,
vii) Key in the following code. (SET TRACK NUMBER)
48tpi:
E4 16
96tpi: E4 32
viii) Key in "C2 00"
(SEEK 00)
Don't
key in "CO" (RECALIBRATE),
ix) Change the connection of the oscilloscope as in item (b).
x) Key in "C5".
(TOO TIMING SEEK ±5)
4107
Summary of Contents for FD-55 Series
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 23: ...Fig 308 Control circuit block diagram 316...
Page 40: ...SECTION 4 MAINTENANCE 4000...
Page 56: ...J4 J12 Option J9 J5 Top view of the FDD Fig 401 Types of connectors 4016...
Page 95: ...Note Refer to item 4 2 1 as to handling of the set screw 4057...
Page 102: ...k Key in Cl SET TMAX L Confirm as in item j 4064...
Page 104: ...Notch B position TP6 voltage 0 5V Max LED indicator Fig 422 Check of file protect sensor 4066...
Page 125: ...k Eject the level disk and release the Invert and ADD modes of the oscilloscope 4087...
Page 136: ...Fig 431 Adjustment track alignment 4098...
Page 153: ...Fig 436 Adjustment of index sensor 4115...
Page 172: ...Fig 440 Replacement of head pad 4134...
Page 176: ...Plate Fig 441 CSS Ass y and shift lever position 4138...
Page 177: ...SECTION 5 DRAWINGS PARTS LIST 500...
Page 179: ...r Fig 501 External view No l 502...
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 188: ...Fig 506 Mechanical section break down 511...
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 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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