Brother HL-4000CN - Fail FIP

V-14
3.2 Fail FIP
Base Engine
001-360 Fan Motor Failure FIP(PL)
Remedy
Step Check
Yes No
1
Initial setting
Check the following for evidence of fault.
Fuser fan replacing condition
Rear fan replacing condition
Replace the
parts concerned
Go to step [2]
2
Isolating faulty fan
Does the fan rear rotate when printing 1
sheet?
Go to step [3] Go to step [15]
3
Checking fan rear
Does fan rear function normally?
Using rear fan diagnostic tool, check by
digital output test.
Replace MCU
and HVPS PWB
Go to step [4]
4
Checking LVPS for signal
Print 1 sheet.
Is P/J166-1PIN<=>P/J166-3PIN 24VDC?
Replace MCU
PWB
Replace
harness
5
Checking LVPS for signal
Print 1 sheet.
Is P/J165-6PIN<=>P/J165-2PIN 0VDC?
Go to step [6] Replace LVPS
6
Checking drive PWB for signal
Print 1 sheet.
Is P/J61-3PIN<=>P/J61-7PIN 0VDC?
Go to step [7]
Replace
harness ASSY
LVNC
7
Checking DRIVE PWB for signal
Print 1 sheet.
Is P/J42-12PIN<=>P/J42-14PIN 0VDC?
Go to step [8]
Replace drive
PWB
8
Checking MCU and HVPS PWB for signal
Print 1 sheet.
Is P/J12-19PIN<=>P/J12-17PIN 0VDC?
Replace MCU
and HVPS PWB
Replace
harness ASSY
DRV2
9
Checking rear fan
Check if an error occurs though the rear
fan was replaced with a new one.
Go to step [10] End of work
10
Checking LVPS for signal
Print 1 sheet.
Is P/J166-2PIN<=>P/J166-3PIN
+3.3VDC?
Replace rear fan Go to step [11]
11
Checking LVPS for signal
Print 1 sheet.
Is P/J165-7PIN<=>P/J165-2PIN
+3.3VDC?
Replace LVPS Go to step [12]
12
Checking drive PWB for signal
Print 1 sheet.
Is P/J61-2PIN<=>P/J61-7PIN +3.3VDC?
Replace harness
ASSY LVNC
Go to step [13]