Brother HL-6050 Service Manual page 252

I-20 Downward fogging of solid black
Possible cause Step
Toner cartridge 1
failure
High-voltage 2
power supply
PCB failure
I-21 Horizontal lines
Possible cause Step
Paper tray 1
contacts
Check
Is the problem solved after
replacing the toner cartridge?
Is the problem solved after
replacing the high-voltage
power supply PCB?
Check
Are the ground contacts on the
back side of the paper tray
connecting correctly?
6-49
HL-6050/6050D/650DN SERVICE MANUAL
Result Remedy
Yes Replace the toner cartridge.
Yes Replace the high-voltage power
supply PCB.
Result Remedy
No Clean the contacts.
Ground
contacts
(9)