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Service Guide ML590/ML591
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 02D: 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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