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Service Guide ML520/521

Chapter 2 Principles of Operation

Line Feed Motor Control

The SP/LF motor driver (Location 5A: MHM2025) drives the line feed motor in two-phase bipolar, based on the phase changeover data output from the LSI.

The serial data from the LSI (04B: MSM79V035) is processed by a register contained in the SP/LF motor driver to measure the overdrive time and to change the phase.

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Oki ML521, ML520 manual Principles of Operation Line Feed Motor Control