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Service Guide ML380
Chapter 2 Principles of Operation
2.1.06 Spacing Drive Circuit
The space motor is driven by a two-phase pulse motor.
The phase signals (Phase 1, Phase 2, Phase 3 and Phase 4) and the basic pulse signals are output from
the LSI (Q7). The pulse signals are modified by the drive voltage compensation circuit and sent back to
the LSI (Q7).
The space overdrive signals (Phase 1DVOV, Phase 2 DVOV, Phase 3DVOV and Phase 4DVOV) switch
Q16 and Q17 ON, setting up the proper phase relationship of analog space motor drive signals (SP Phase
1 through SP Phase 4). These signals are then sent to the space motor.
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Summary of Contents for ML380
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