Brother HL-4000CN - Page 238

V-28
Black Toner Cartridge Detached FIP
Remedy
Step Check
Yes No
1
Initial setting
Check the following for evidence of fault.
Cartridge replacing condition
Toner cartridge switch ASSY (K) replacing
condition
Toner cartridge switch ASSY (K) actuator
replacing condition
Toner cartridge switch ASSY (K)
connector replacing condition
Replace the parts
concerned
Go to step [2]
2
Checking toner cartridge switch ASSY
Does toner cartridge switch ASSY
function normally?
Using diagnostic tool, check by digital
input test.
Replace MCU and
HVPS PWB
Go to step [3]
3
Checking drive PWB for signal
Is P/J51-31PIN<=>P/J51-32PIN 0VDC?
Go to step [7]
Go to step [4]
4
Checking toner cartridge switch ASSY (K)
for signal
Is P/J434-2PIN<=>P/J434-1PIN 0VDC?
Go to step [6] Go to step [5]
5
Checking toner cartridge switch ASSY (K)
for continuity
Is P434-2PIN<=>P434-1PIN of toner
cartridge switch ASSY (K) continuous
normally?
Go to step [6]
Replace toner
cartridge
switch
ASSY (K)
6
Checking harness ASSY TNR for
continuity
Is J51<=>J434 continuous normally?
Go to step [7]
Replace
harness ASSY
TNR
7
Checking drive PWB for signal
Is P/J42-3PIN<=>P/J42-14PIN 0VDC?
Go to step [8]
Replace drive
PWB
8
Checking MCU and HVPS PWB for signal
Is P/J12-28PIN<=>P/12-17PIN of MCU
and HVPS PWB 0VDC?
Replace MCU and
HVPS PWB
Go to step [9]
9
Checking harness ASSY DRV2 for
continuity
Is J12<=>J42 continuous normally?
Replace MCU and
HVPS PWB
Replace
harness ASSY
DRV2