Panasonic KX-FT982LS-B Service Manual page 26

KX-FT982LS-B / KX-FT984LS-B / KX-FT988LS-B
6.4.5. Stepping Motor Drive Circuit
1. Function
One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized
for reading or printing.
2. Circuit Operation
During motor drive, ASIC IC1 pin 124 becomes a high level, and Q2 and Q1 go ON as a result. +24 V is supplied tothe motor
coil.
Stepping pulses are output from ASIC IC1, causing driver IC7 to go ON. The motor coil is energized sequentially in 2 phase
increments or 1-2 phase increments, which causes a 1-step rotation. A 1-step rotation is 0.13mm of recording paper or docu-
ment paper. The timing chart is below.
When the motor is OFF, ASIC IC1 pin 124 becomes a low level and Q2 and Q1 also turns OFF. Instead of +24V, +5V is supplied
through D11 so that the motor is held in place.
Stepping Motor Phase Pattern
Function Mode
Copy Fine/Photo
Super Fine
FAX STD
Fine/Photo
Super Fine
——— Paper Feed
Phase Pattern
1-2
1-2
2
1-2
1-2
2
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Speed
432 pps
216 pps
432 pps
432 pps
216 pps
432 pps