Panasonic FP-7818 Service Manual & Parts Manual page 325

(3) Tamper drive motor control
The guide bar swing motor is a 4-phase (FA-S660), 2-phase (FA-S620) control
stepping motor.
The sorter controller PCB sends drive pulses (GBMA, GBMA*, GBMB, and GBMB*/
GBMPA, GBMPA*, GBMPB, GBMPB*) to the motor driver.
The motor driver controls the output timing of the pulse signal A, A*, B, and B*
according to each signal, thereby switching ON and OFF the guide bar swing
motor (M3) and its rotating direction.
While the guide bar swing motor (M3) is at the hold condition, the output timing of
the pulse signal A, A*, B, and B* is fixed.
The fuse (ICP2/FA-S660) cuts off the power supply circuit to stop the guide bar
swing motor (M3) when overcurrent flows to the circuit.
Sorter Controller Circuit PCB
GBMPA
GBMPA*
GBMPB
Q1
CPU
GBMPB*
Sorter Controller Circuit PCB
GBMA
GBMA*
GBMB
Q1
CPU
GBMB*
4-4
+24V
A
Q30
Motor A*
driver
B
B*
GBHP
FA-S620
+24V
IPC2
A
Q34
Motor A*
driver
B
B*
GBHP
FA-S660
Guide bar
swing motor
M3
PI3
Guide bar home
position sensor
Guide bar
drive motor
M3
PI3
Guide bar home
position sensor