Brother HL-4000CN Service Manual page 248

Tray2 Paper Near Empty FIP
Step
Initial setting
Check the following for evidence of fault.
1 Tray2 low paper sensor replacing
condition
Sensor actuator replacing condition
Does the error occur even if the paper is
2
added?
Checking tray2 low paper sensor
Does tray2 low paper sensor function
3 normally?
Tray2 low paper sensor using diagnostic
tool, check by digital input test.
Checking feeder PWB for signal
4
Is P/J82-10 PIN <=>P/J82-9 +3.3VDC?
Checking feeder PWB for signal
5
Is P/J81-18 PIN <=>P/J81-23 +3.3VDC?
Harness ASSY OPFPLG/ harness ASSY
Checking OPFREC/ harness ASSY
OPFMAIN for continuity
6
Check the following for continuity.
J81-18PIN<=>J810-A9PIN<=>J210-
B9PIN<=>J21-9PIN
Checking feeder PWB for signal
7
Is P/J82-8PIN<=>P/J82-9 +5VDC?
Tray3 Paper Near Empty FIP
Step
Initial setting
Check the following for evidence of fault.
1 Tray3 low paper sensor replacing
condition
Sensor actuator replacing condition
Does the error occur even if the paper is
2
added?
Checking tray3 low paper sensor
Does tray3 low paper sensor function
3 normally?
Tray3 low paper sensor using diagnostic
tool, check by digital input test.
Checking feeder PWB for signal
4
Is P/J83-10 PIN <=>P/J83-9 +3.3VDC?
Checking feeder PWB for signal
5
Is P/J81-17 PIN <=>P/J81-23 +3.3VDC?
Harness ASSY OPFPLG/ harness ASSY
Checking OPFREC/ harness ASSY
OPFMAIN for continuity
6
Check the following for continuity.
J81-17PIN<=>J810-A10PIN<=>J210-
B10PIN<=>J21-10PIN
Checking feeder PWB for signal
7
Is P/J83-8PIN<=>P/J83-9 +5VDC?
Check
Check
V-38
Remedy
Yes
Replace the parts
Go to step [2]
concerned
Go to step [3] End of work
Replace MCU and
Go to step [4]
HVPS PWB
Go to step [7] Go to step [5]
Replace feeder
Go to step [6]
PWB
Replace MCU and Replace
HVPS PWB harness ASSY
Replace feeder which is not
PWB continuous
Replace tray2 Replace feeder
low paper sensor PWB
Remedy
Yes
Replace the parts
Go to step [2]
concerned
Go to step [3] End of work
Replace MCU and
Go to step [4]
HVPS PWB
Go to step [7] Go to step [5]
Replace feeder
Go to step [6]
PWB
Replace MCU and Replace
HVPS PWB harness ASSY
Replace feeder which is not
PWB continuous
Replace tray3 Replace feeder
low paper sensor PWB
No
No