Oki ML521, ML520 manual Principles of Operation Encoder Disk

Page: 35

Service Guide ML520/521

Chapter 2 Principles of Operation

Encoder Disk

As the space motor operates, the encoder disk spins. When the encoder disk interrupts the photo sensors, the signals Phase A and Phase B are generated. The LSI (Location 04B: MSM79V035) divides these edge pulse signals (the frequency division is based on the selected print pitch) to generate the signal IPT. The IPT signal provides dot-on timing and carriage position detection timing.

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