Brother HL-4040CN Service Manual page 31

Error code 31
Print Unable 31
Turn the power off and then back on again.
Density sensor failure
Error code 32
Print Unable 32
Turn the power off and then back on again.
Density sensor shutter performance malfunction
User Check
- Check if there is a scratch, dirt or the like on the belt unit. If there is, replace the belt unit with
a new one.
Step
1 Harness connection failure of
density sensor holder ASSY
2 Harness connection failure of
density sensor solenoid
ASSY
3 Density sensor holder ASSY
failure
4 Transfer HVPS PCB unit
failure
5 Engine PCB failure
Error code 33
Print Unable 33
Turn the power off and then back on again.
Color registration sensor failure
User Check
- Check if there is a scratch, dirt or the like on the belt unit. If there is, replace the belt unit with
a new one.
Step
1 Harness connection failure of
registration-mark sensor PCB
ASSY
2 Registration-mark sensor
PCB failure
3 Transfer HVPS PCB unit
failure
4 Engine PCB failure
Cause
Check the harness connection between the
density sensor holder ASSY and registration relay
PCB, and the one between the registration relay
PCB and engine PCB. Then, reconnect them.
Check the harness connection between the engine
PCB and registration relay PCB and reconnect
them.
Replace the density sensor holder ASSY.
Replace the transfer HVPS PCB unit.
Replace the engine PCB ASSY.
Cause
Check the harness connection of the registration-
mark sensor PCB ASSY and reconnect it.
Check the performance of the registration-mark
sensor following the procedure described in
"Maintenance mode
replace the registration-mark sensor PCB ASSY.
Replace the transfer HVPS PCB unit.
Replace the engine PCB ASSY.
1-14
Remedy
Remedy
75". If any problem occurs,
Confidential