Panasonic KX-FB423CN Manual page 345

KX-FB423CN
7.5.2. ADF (Auto Document Feed) MOTOR DRIVE CIRCUIT
1. Functions
This motor functions for main operations including FAX transmission, ADF copy and PC scan.
This feed document paper synchronized for reading.
2. Motor operation
During motor driving, pin 43 of Gate Array IC520 becomes a high level, and Q507, Q504 turns ON.
As a result, +24V is supplied to the motor coil.
Stepping pulses are output from ASIC IC501 pins, 125,128, 129, 130, causing driver IC102 (on Analog Board) pins,
1~4 to drive the motor coil.
The motor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation.
A 1-step rotation feeds 0.042mm of document paper.
7.5.2.1. TIMING CHART
(1) 1-2 phase excitation
(2) 1-2 phase excitation output waveform (example"A Phase")
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