Brother HL-4000CN Service Manual page 310

A B
2.5.2 Monitoring
MCU AND HVPS PWB
1 PL15.1
2.5.1
1
SOS SENSED SIGNAL
2
3
4
1
Imaginary Line
5
6
C D
CONTROL PANEL
PL1.1
CONTROL
LOGIC
6-370
VI-13
E F G
IOT Scanner Failure
6-370
H J
2.5 OPTICS(Scanner)