Mitsubishi Electric M4853, Руководство по обслуживанию

Страница: 82 / 108

5.3.4 Head alignment adjustment
1) Equipment
CE Tester
CE Diskette (DYMEK 502-ID STANDARD DISKETTE)
Oscilloscope
Hex wrench (2.0 mm dia.)
(Fine point diagonal cutter)
2) Adjustment procedure
2)-1 Connect CE Tester to Drive (set power o f f ) .
2)-2 Turn-on power switch and motor on.
2)-3 Select drive and load CE diskette (close clamp
door slowly).
2)-4 Seek TK00 to TK32 then read amplitude of each
waveform (positioning waveform) at T?A9, TFA10
under read mode (see Figure 7 ) .
Trigger: EXT - +INDEX
(DC, +) (TPB14)
Sianal : CHI
-
TPA9 (AC,
Normal) Add
Inverted) CH2 - TPA10 (AC ,
Specification:
CHECK ADJUST
when A > B B/A >0.57
0 .6
A < B
A/3 > 0.57
0.6
2)-5 In each case of seek direction is TK00 to TK32
or TK79 to TK32, loosen carriage set screw,
then adjust Carriage Assy until signal comes
within specification. Do not forget to tighten
the screw.
3) Note: Adjust under following conditions
Temperature: 23°C =2°C exposed over 2 hours
Humidity : 50% :5¾