Brother HL-4000CN Service Manual page 239

Transfer Roll Cartridge Detached FIP
Step
Initial setting
Check the following for evidence of fault.
1 Transfer roll cartridge ASSY replacing
condition
ADC sensor ASSY replacing condition
Checking harness ASSY CTD for
connection
2
Is the harness ASSY CTD connected to
the ADC sensor ASSY normally?
Checking harness ASSY CTD for
3 continuity
Is J136<=>J1361 continuous normally?
Checking harness ASSY front 1A for
4 continuity
Is P1361<=>J13 continuous normally?
Checking harness ASSY front 1A for
5 signal
Is P/J136-5PIN<=>P/J136-3PIN 0VDC?
Checking transfer roll cartridge ASSY
Check if an error occurs though the
6
transfer roll cartridge ASSY was replaced
with a new one.
Print Head Cartridge Detached FIP
Step
Initial setting
Check the following for evidence of fault.
Print head cartridge ASSY replacing
1 condition
PWBA CRUM in print head cartridge
ASSY replacing
condition
Checking PWBA CRUM for connection
Is PWBA CRUM connector connected to
2
the harness connector normally?
Checking harness ASSY CRUM for
continuity
3
Is J170<=>J71 continuous normally?
Checking harness ASSY EEPROM for
continuity
4
Is P71<=>J140 continuous normally?
Checking print head cartridge ASSY
Check if an error occurs though the print
5
head cartridge ASSY was replaced with a
new one.
Check
Check
V-29
Remedy
Yes
Replace the parts
Go to step [2]
concerned
Replace the
Go to step [3] parts
concerned
Replace
harness ASSY
Go to step [4]
CTD
Replace
Go to step [5] harness ASSY
front 1A
Replace ADC
Go to step [6]
sensor ASSY
Replace MCU and
End of work
HVPS PWB
Remedy
Yes
Replace the parts
Go to step [2]
concerned
Replace
Go to step [3]
harness ASSY
CRUM
Replace
Go to step [4]
harness ASSY
CRUM
Replace
Go to step [5]
harness ASSY
EEPROM
Replace MCU and
End of work
HVPS PWB
No
No