Brother LX-200 Service Manual page 159

Problem
b. Defective LED Low output from the main
on the Switch CPU ports P32 to P35 (Pin
PCB 35 to Pin 38) that drive
indicators LED1 to LED4?
Does LED1 to LED4 light
when Pin 6 to Pin 9 on Main
PCB connector CN1 is Low?
Check Item
Defective main CPU#1.
Defective switch
harness assy.
Defective LED1 to
LED4.
Cause Remedy
Replace Main PCB
assy.
Replace switch
harness assy.
Replace the Switch
PCB.
7-7
See
Repair
Section
Replace 3.3.3
CPU#1. 3.3.4
3.3.5
3.5.1
3.3.3
3.3.4
3.3.5
Replace 3.3.3
indicator 3.3.4
LED1 to 3.3.5
LED4. 3.3.7
3.3.8
3.3.9