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-in or step-out as follows to obtain the
most similar waveform to that in Fig.430.
Step operation can be
done by key "8" (STEP-IN) and key "9” (STEP-OUT). By a depression
of these keys, head will move for one track space.
48tpi:
2 tracks
96tpi:
4 tracks
Note: The above 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 MA M of the stepping motor.
For a 48tpi FDD, the lobe pattern as in Fig.430 should be 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
in order to improve the measurement accuracy and switching of
humidity coefficient.
If it is off, turn it on by depressing "DD"
key.
(fc) Key in "E3” (ALIGNMENT)
Calibration value of the alignment disk and environmental relative
humidity should be set previously in the SKA.
(L) Confirm all the indications on the DATA m i l (%) indicator are
within ±30%*
The initial digit of the DATA indicator is the symbol.
h
(+) mark
indicates that the head is shifted inward from the reference position,
while - mark indicates that the head is shifted outward.
t
(m) For a double sided FDD, execute the same check for side 1 head
according to the following procedure.
4100
Содержание FD-55 Series
Страница 7: ...SECTION 3 THEORY OF OPERATION 300...
Страница 8: ...3 1 CONSTRUCTION AND FUNCTION 3 1 1 General Block Diagram Fig 301 General block diagram 301...
Страница 23: ...Fig 308 Control circuit block diagram 316...
Страница 40: ...SECTION 4 MAINTENANCE 4000...
Страница 56: ...J4 J12 Option J9 J5 Top view of the FDD Fig 401 Types of connectors 4016...
Страница 81: ...Collet shaft Front lever Gap between collet shaft and set arm hole Fig 412 Adjustment of set arm position 4043...
Страница 87: ...Fig 416 Adjustment of arm lifter Note Viewed from front bezel side Fig 417 Gap of arm lifter 4049...
Страница 95: ...Note Refer to item 4 2 1 as to handling of the set screw 4057...
Страница 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...
Страница 102: ...k Key in Cl SET TMAX L Confirm as in item j 4064...
Страница 104: ...Notch B position TP6 voltage 0 5V Max LED indicator Fig 422 Check of file protect sensor 4066...
Страница 125: ...k Eject the level disk and release the Invert and ADD modes of the oscilloscope 4087...
Страница 136: ...Fig 431 Adjustment track alignment 4098...
Страница 153: ...Fig 436 Adjustment of index sensor 4115...
Страница 159: ...Head carriage Ass 1 Stepping motor capstan Guide shafts Fig 437 Replacement of head carriage Ass y 4121...
Страница 169: ...12 it is recommended to connect the FDD to the system for overall test Refer to item 4 2 5 1 4131...
Страница 172: ...Fig 440 Replacement of head pad 4134...
Страница 176: ...Plate Fig 441 CSS Ass y and shift lever position 4138...
Страница 177: ...SECTION 5 DRAWINGS PARTS LIST 500...
Страница 179: ...r Fig 501 External view No l 502...
Страница 181: ...PCBA DD motor servo Fig 503 External view No 3...
Страница 182: ...Fig 504 External view No 4 505...
Страница 183: ...Partis nrnnber of the FDD Fig 505 Extemal view No 5 506...
Страница 188: ...Fig 506 Mechanical section break down 511...
Страница 199: ...PCBA DD MOTOR SERVO PARTS LOCATION Type S i 522A...
Страница 200: ...PCBA DD TOR SERVO PARTS LOCATION Type TO 522B...
Страница 201: ...PCBA DD MOTOR SERVO PARTS LOCATION Type G 522C...
Страница 202: ...PCBA DD MOTOR SERVO PARTS LOCATION Type T 522D...
Страница 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...
Страница 204: ...523B PCBA DO MOTOR SERVO SCHEMATIC Type K...
Страница 205: ...o 523C i 1 PACB DD HOTOR SERVO SCHEMATIC Type G...
Страница 206: ...CV 5 3 3 H 2SV 523D PC DD M o t o r SERVO SCHEMATIC Type T...
Страница 207: ...PCBA MFD CONTROL B PARTS LOCATION PCB ISSUE A G 524A...
Страница 208: ......
Страница 209: ...PCBA FRONT OPT PARTS LOCATION 525 PO I...
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