Brother HL-4000CN Service Manual page 229

Duplex JAM FIP
Step
Initial setting
Check the following for evidence of fault.
Chute ASSY exit replacing condition
1
DUP motor replacing condition
DUP JAM sensor actuator replacing
condition
Chute ASSY out replacing condition
Checking DUP JAM sensor
Does DUP JAM sensor function normally?
2
Using DUP JAM sensor diagnostic tool,
check by digital input test.
Checking harness ASSY front 2 for signal
Push the DUP JAM sensor actuator by
3
finger
Is J319-3PIN<=>J319-2PIN 0VDC?
Checking harness ASSY front 2 for
continuity
4
Is J133<=>J139 continuous normally?
Checking harness ASSY front 1A for
continuity
5
Is P139<=>J13 continuous normally?
Checking DUP JAM sensor
6 Check if an error occurs though the
sensor was replaced with a new one.
Checking DUP motor for operation
7 Check if the sheet is reversed when
printing 1 sheet in the duplex mode.
Checking DUP motor
Does DUP motor function normally?
Using DUP motor diagnostic tool, check
8
by
digital output test.
In the test, close the interlock SW.
Checking drive PWB for signal
9
Is P/J50-1PIN<=>P/J60-2PIN +24VDC?
Checking harness ASSY DUP for
10 continuity
Is J131<=>J50 continuous normally?
Checking harness ASSY DRV 2 for
continuity
Check the following for continuity.
J12-5PIN<=>J42-26PIN
11
J12-6PIN<=>J42-25PIN
J12-7PIN<=>J42-24PIN
J12-8PIN<=>J42-23PIN
J12-29PIN<=>J42-2PIN
Checking DUP motor
12 Check if an error occurs though the
motor was replaced with a new one.
Dose the exit roll rotate smoothly by hand?
13
Check
V-19
Remedy
Yes
Replace the parts
Go to step [2]
concerned
Go to step [7] Go to step [3]
Go to step [5] Go to step [4]
Replace
Go to step [5]
harness ASSY
front 2
Replace
Go to step [6]
harness ASSY
front 1A
Go to step [7] End of work
Go to step [13] Go to step [8]
Go to step [13] Go to step [9]
Replace drive
Go to step [10]
PWB
Replace
Go to step [11] harness ASSY
DUP
Replace
Go to step [12] harness ASSY
DRV2
Replace MCU and
End of work
HVPS PWB
Check the
Check the sheets gears for
for gear or skew foreign
substances
No