Brother HL-4000CN Service Manual page 230

Fuser JAM FIP
Step
Initial setting
Check the following for evidence of fault.
Sensor exit actuator replacing condition
Fuser ASSY replacing condition
Front cover replacing condition
1
Chute DUP in replacing condition
Transfer roll cartridge ASSY replacing
condition
Print head cartridge ASSY replacing
condition
Checking fuser ASSY connector
2 Remove the fuser ASSY connector, and
check for broken or curved pins.
Checking sensor exit
Does sensor exit function normally?
3
Using sensor exit diagnostic tool, check by
digital input test.
Checking harness FSR2 for signal
4 Push the paper in the fuser ASSY
Is P/J138-3PIN<=>P/J138-2PIN 0VDC?
Checking harness FSR2 for continuity
5 Is J232<=>J138 continuous normally?
Checking harness ASSY front 1A for
6 continuity
Is P138<=>J13 continuous normally?
Checking fuser ASSY
7 Check if an error occurs though the
fuser ASSY was replaced with a new one.
Checking fuser motor for operation
8 Does the fuser motor run when printing 1
sheet?
Checking fuser motor
Does fuser motor function normally?
9
Using fuser motor diagnostic tool, check
by digital output test.
Checking drive PWB for signal
10
Is P/J52-1PIN<=>P/J60-2PIN +24VDC?
Checking harness ASSY DRV 1 for
continuity
Check the following for continuity.
J11-12PIN<=>J41-29PIN
11
J11-13PIN<=>J41-28PIN
J11-14PIN<=>J41-27PIN
J11-15PIN<=>J41-26PIN
J11-16PIN<=>J41-25PIN
Checking fuser motor
Replace a new fuser motor, and check if
12
the fuser motor rotates when printing 1
sheet.
Check
V-20
Remedy
Yes
Replace the parts
Go to step [2]
concerned
Replace the
Go to step [3] parts
concerned
Go to step [4]
Go to step [9]
Go to step [6] Go to step [5]
Replace
Go to step [6] harness ASSY
FSR2
Replace
Go to step [7] harness ASSY
Front 1A
Go to step [9] End of work
Check the gears
Go to step [9]
for meshing
Replace MCU and
Go to step [10]
HVPS PWB
Replace drive
Go to step [11]
PWB
Replace
Go to step [12] harness ASSY
DRV 1
Replace MCU
End of work and HVPS
PWB
No