Brother HL-4000CN - Page 246

V-36
Front Cover FIP
Remedy
Step Check
Yes No
1
Initial setting
Check the following for evidence of fault.
Drive PWB replacing condition
Front cover replacing condition
Interlock SW actuator replacing condition
Replace the parts
concerned
Go to step [2]
2
Checking interlock SW
Does interlock SW function normally?
Using interlock SW, check by digital
output test.
Replace MCU and
HVPS PWB
Go to step [3]
3
Checking drive PWB for signal
Close front cover
Is P/J41-35PIN<=>P/J41-22 0VDC?
Replace MCU and
HVPS PWB
Replace drive
PWB
Full Stack FIP
Remedy
Step Check
Yes No
1
Initial setting
Check the following for evidence of fault.
Full stack sensor replacing condition
actuator replacing condition
Replace the parts
concerned
Go to step [2]
2
Checking full stack sensor
Does full stack sensor function normally?
Full stack sensor using diagnostic tool,
check by Digital Input Test.
Replace MCU and
HVPS PWB
Go to step [3]
3
Checking harness ASSY front 2 for signal
Is P/J139-6PIN<=>P/J139-5PIN
+3.3VDC?
Replace MCU and
HVPS PWB
Go to step [4]
4
Checking harness ASSY front 2 for signal
Is P/J139-4PIN<=>P/J139-5PIN
+3.3VDC? Replace full stack
sensor
Replace
harness ASSY
front 1A
Replace MCU
and HVPS
PWB