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5.3.2 TKOO sensor position adjustment
1)
Equi pment
CE Tester (Disk Exerciser)
Scratch Diskette
No. 1 plus screw driver
Oscilloscope
2)
Adjustment procedure
2)-1 Connect CE Tester to Drive then turn-on power switch
and load diskette.
2)-2 Turn-on motor and select drive.
2)-3 Repeat seek between TKOO and 02 (see Figure 5).
2)-4 Observe waveform (TKOO) at TPBl using oscilloscope.
tr;gger
CHl--step (DC,
+)
TPD15
signal
CH2--TKOO (DC
)
TPEl
2)-5 Loosen screw and adjust time
until it comes to
within 3-4ms by moving TKOO in the direction of
the arrow
(see figure).
3)
Note:
3)-1 Set step rate at 3ms using CE tester.
3)-2 Make sure there are 2 pulses on step signals.
5.3.3
TROO Sensor Check (Alternate Procedure--recommended)
Connect disk exerciser to drive
Turn on motor and Select drive
Insert Diskette
Recalibrate (Seek) to TROO
Connect oscilloscope probe channel I/DC to TPBl
Trigger Mode Auto
Source CHI
2 volts/Div
±
lmsec./Div
TPBl should be high at TKOO
Step out to TK02
TPBl should be low .
-8
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