Brother HL-4200CN Service Manual page 225

Step
Checking fuser motor
Does fuser motor function normally?
9
Using fuser motor diagnostic tool, check
by digital output test.
Checking PWBA HBN DRV 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-19
Remedy
Replace MCU
Go to step [10]
HL-4200
Replace PWBA
Go to step [11]
HBN DRV
Replace
Go to step [12] harness ASSY
DRV 1
Replace MCU
End of work
HL-4200
Step