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Head Alignment Adjustment - Mitsubishi Electric M4853 Maintenance Manual

5.25 inch flexible disk drive
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5.3.4

Head alignment adjustment

1)
Equipment
Disk Tester
CE Diskette (DYMEK 502-ID STANDARD DISKETTE)
No. 1 screw driver
Oscilloscope
Hex wrench (1.5 mm dia.)
(Fine point diagonal cutter)
2)
Adjustment procedure
2)-1
Connect Disk Test to drive (set power off)
2)-2
Turn-on power switch and motor on.
2)-3
Select drive and load CE diskette (close clamp door
slowly).
2)-4
Seek TKOO to TK32 then read amplitude of each wave-
form (positioning waveform)
read mode (see Figure 7) .
Tigger:
Signal:
Specification:
21 -6
In case seek direction is TKOO TK32 or TK79 TK32,
loosen both set screws, then adjust STM until
signal comes within spec.
3 )
Note:
Adjust under following conditions
Temperature:
Humidity:
EXT —
CHI -
CH2 -
B/A >
when
A>B
A/B >
A<B
23°C ±2°C exposed over 2 hours
50% ±5%
at TPB9, TPB10 under
INDEX
(DC, +)
TPB9
(AC
)
TPB10
(AC, INV)
CHECK
ADJUST
0.57
0.6
0.57
0.6
Tighten screw.
(TPD14)
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