Brother HL-4200CN Service Manual page 220

Step
Checking drive PWBA HBN DRV for
signal
13
Print 1 sheet.
Is P/J42-29PIN<=>P/J42-14PIN
+3.3VDC?
Checking MCU HL-4200 for signal
14
Print 1 sheet.
Is P/J12-2PIN<=>P/J12-17PIN +3.3VDC?
Checking fuser fan
Does fuser fan function normally?
15
Using fuser fan diagnostic tool, check by
digital output test.
Checking drive PWBA HBN DRV for
signal
16
Print 1 sheet.
Is P/J50-7PIN<=>P/J50-9PIN +24VDC?
Checking drive PWBA HBN DRV for
signal
17
Print 1 sheet.
Is P/J42-30PIN<=>P/J42-14PIN 0VDC?
Checking MCU HL-4200 for signal
18
Print 1 sheet.
Is P/J12-1PIN<=>P/J12-17PIN 0VDC?
Checking harness ASSY DUP2 for
19
continuity
Is J50<=>J137 continuous normally?
Checking fuser fan
20
Check if an error occurs though the fuser
fan was replaced with a new one.
Checking drive PWBA HBN DRV for
signal
21
Print 1 sheet.
Is P/J50-8PIN<=>P/J50-9PIN +3.3VDC?
Checking drive PWBA HBN DRV for
signal
22
Print 1 sheet.
Is P/J42-27PIN<=>P/J42-14PIN
+3.3VDC?
Checking MCU HL-4200 for signal
23
Print 1 sheet.
Is P/J12-4PIN<=>P/J12-17PIN +3.3VDC?
Check
V-14
Remedy
Yes
Replace PWBA
Go to step [14]
HBN DRV
Replace harness Replace MCU
ASSY DRV2-2 HL-4200
Replace MCU
Go to step [16]
HL-4200
Go to step [19] Go to step [17]
Replace PWBA
Go to step [18]
HBN DRV
Replace
Replace MCU
harness ASSY
HL-4200
DRV2-2
Replace
Go to step [20] harness ASSY
DUP2
Go to step [21]
Replace Fuser fan Go to step [22]
Replace PWBA
Go to step [23]
HBN DRV
Replace harness Replace MCU
ASSY DRV2-2 HL-4200
No
End of work