Brother HL-4000CN Service Manual page 234

Step
Checking clutch ASSY MSI turn for
resistance value
30
Remove the clutch connector J19.
Is J19-1PIN<=>J19-2PIN less than 200 ?
Checking solenoid feed MSI for operation
Does the feed gear in the MSI run when
printing 1 sheet?
31
Checking MSI feed solenoid
Does MSI feed solenoid function
normally?
32
Using MSI feed solenoid diagnostic tool,
check by digital output test.
In the test, close the interlock SW.
Checking MSI feed solenoid for resistance
value
33
Remove J132 from MSI feed solenoid
Is J132-1PIN<=>J132-2PIN less than
100 ?
Checking harness ASSY front 2 for
continuity
34
Check the following for continuity.
P132-1PIN<=>J139-11PIN
P132-2PIN<=>J139-10PIN
Checking harness ASSY front 1A for
continuity
35
Check the following for continuity.
P139-1PIN<=>J13-11PIN
P139-2PIN<=>J13-10PIN
Check
V-24
Remedy
Yes
Replace MCU and
Replace MSI
turn clutch
HVPS PWB
Check parts for
missing and
Go to step [32]
change paper, if
no problem
Check the spring
and stopper of
Go to step [33]
MSI feed solenoid
for disengagement
Replace MSI
Go to step [34]
feed solenoid
Replace
Go to step [35] harness ASSY
front 2
Replace
Replace MCU and
harness ASSY
HVPS PWB
front 1A
No