Fail Fip - Brother HL-4000CN Service Manual

3.2

Fail FIP

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