Motor Drive Section - Panasonic KX-FLB802CX Service Manual

6.8.

MOTOR DRIVE SECTION

6.8.1. Engine Motor Control Circuit
1. Functions
All driving force of printer engine part is supplied by this engine motor. Engine motor is controlled to rotate at constant
speed during printing and copying mode.
2. Motor operation
<Start operation>
In order to start the motor rotation, following 3 signals are supplied from IC604.
1. SS signal
Output pin: Pin 120/Output Signal: "H"
This signal is inverted by transistor Q634, and supplied to motor as "Start/Stop" signal.
2. Clock signal
Output pin: Pin 121/Output Signal: Pulse
Pulse frequency: approx. 1.9 KHz (at the normal printing speed)
Pulse frequency: approx. 0.5 KHz (at the half printing speed)
3. Break signal
Output pin: Pin 122/Output Signal: "L"
When motor reaches constant speed, low level signal is output from the motor.
as "Lock detect" signal.
if this "Lock detect" signal does not become low level within predetermined period after "SS" signal becomes "H" level, or if
"Lock detect" signal becomes "H" level during rotating, it is judged that "Motor Error" occurred.
Timing Chart of Start operation
KX-FLB802CX/KX-FLB812CX/KX-FLB802CXS/KX-FLB812CXS
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