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Check And Adjustment; Diskette Rotation Cycle Adjustment - Mitsubishi Electric M4853 Maintenance Manual

5.25 inch flexible disk drive
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Table of Contents
5.3
Check and Adjustments
5.3.1
Diskette rotation cycle adjustments
1)
Equipment
Disk Tester
Scratch Diskette
Universal Counter
VR Adjustment Driver
2)
Adjustment procedure
2)-1
Connect CE Tester to Drive then turn-on power switch.
2)-2
Load diskette then turn-on motor with drive select.
2)-3
Make sure HLMG ON.
2)-4
Seek to TKOO.
2)-5
Connect universal counter to INDEX (interface signal
TPD14) and measure rotational cycle rate.
2)-6
Adjust counter reading until it comes within
specifications using SPM VR (see Figure 4).
2) -7
After this adjustment, Lock VR with white paint.
3 )
Test specification
3) -1
Check:
3)-2
Adjust: ±1.0% (198.0 - 202.0 ms)
±1.6% (196.8 - 203.2 ms)

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