Index Emitter/Detector Adjustment; Track 0 Waveform - HP 9130K Service Manual

5-10
Maintenance
S. Rest the drive board on a piece of insulating material, such as cardboard, on top of the
drive assembly.
6. Setup the DSU as follows:
MAX TRACK: 4
MIN TRACK: 0
STEP RATE: Sms/track (Alternate Seek)
7. Connect and setup the oscilloscope as follows:
Connect channel A to TP12/US-S and (STEP) and ground lead to TP10/E11.
Connect channel B to U4F pin 11/U1 pin 11 and ground lead to TP6/E11.
Trigger:
Display:
Volts/DIV:
Time/DIV:
Internal on channel A (paS)
Channel B
.02V/DIV (using a 10: 1 probe)
1ms/DIV
8. With the scope connected and setup, the pattern should be similar to that of Figure
S-8. The duration of the pulse from TO to T1 must be lSms or less time TO to T2 20ms
or less.
Figure 5-8: Track 0 Waveform
9. With the torque driver adjusted to 8 inch pounds, re-tighten the track 0 switch retain-
ing screw while observing the oscilloscope pattern.
10. Reinstall the drive board and connectors PS and P6. Tighten the board retaining
screws with the torque driver set to 8 inch pounds.
Index Emitter/Detector Adjustment
This adjustment is required when the index emitter/detector assembly has been replaced.