Brother HL-4000CN, Service Manual

Page: 243 / 345

V-33
Black Toner Empty FIP
Remedy
Step Check
Yes No
1
Initial setting
Check the following for evidence of fault.
Low toner sensor replacing condition
Toner cartridge replacing condition
Toner motor replacing condition
Replace the parts
concerned
Go to step [2]
2
Checking toner cartridge
Check if an error occurs though the
cartridge was replaced with a new one.
Go to step [3] End of work
3
Checking drive PWB for signal
Is P/J51-36<=>P/J51-35 less than
+0.2VDC?
Go to step [6]
Go to step [4]
4
Checking harness ASSY TNR for
continuity
Is J441<=>J51 continuous normally?
Go to step [5]
Replace
harness ASSY
TNR
5
Checking low toner sensor
Check if an error occurs though the low
toner sensor was replaced with a new one.
Go to step [6] End of work
6
Checking harness ASSY DRV2 for
continuity
Is J12-24<=>J42-7 continuous normally? With tool go to
step [7]
Without tool go to
step [8]
Replace
harness ASSY
DRV2
7
Checking toner motor
Does toner motor function normally?
Using toner motor, check by digital output
test.
In the test, close the interlock SW.
Check the toner
stirring auger or
gear for damage
Go to step [8]
8
Checking PWBA DRV3 for signal
Is P/J51-24<=>P/J60-2 +24VDC?
Go to step [9]
Replace drive
PWB
9
Checking harness ASSY TNR for
continuity
Is J514<=>J51 continuous normally?
Go to step [10]
Replace
harness ASSY
TNR
10
Checking toner motor
Check if an error occurs though the toner
motor was replaced with a new one.
Go to step [11] End of work
11
Checking harness ASSY DRV1 for
continuity
Check the following for continuity.
J11-37<=>J41-4
J11-38<=>J41-3
J11-39<=>J41-2
J11-40<=>J41-1
Replace drive
PWB, and if still
faulty, replace
MCU and HVPS
PWB
Replace
harness ASSY
DRV1