Fujitsu Impact 3650 Maintenance Manual page 148

[Error detection circuit]
Over current detection
If the space motor, line feed motor, or tractor motor current exceeds the respective absolute rated value, an over
current detection signal is sent to the HDLSI.
After a given period of the receipt of the detection signal, the HDLSI controls the PWSTOP signal to turn off +34 V.
It also notifies the MPU of the occurrence of a driver error.
[Open/close, APTC, skew correction, and CSF motor control and drive circuits]
The phase data and switchover timing for the open/close, APTC, skew correction, and CSF motors are controlled
by motor LSI control, but current control is not performed.
[CSF short-circuit protection circuit]
If abnormal current flows to +34 V for some reason, the fuse is blown to prevent +34 V from being supplied
from the main board (GMC06**).
MTLSI
MTLSI
MBCG46183-
MBCG46183-525PF
525PF
Figure 5.3.18 Open/close, APTC, skew correction, and CSF motor drive circuit block diagram
APTC
APTC motor
drive circuit
motor drive
APTCM0-3
circuit
Open/close
HCPPM0-3
motor rive
circuit
Skew
correction
RPM0-3
drive
Front CSF
FCSFM0-3
drive circuit
RCSFM0-3
Rear CSF
drive circuit
148
+34V
APTC motor
M
Open/close motor
M
Skew correction motor
M
Front CSF motor
M
Rear CSF motor
M