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

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)