Brother HL-600 Service Manual page 58

I-7 Black and blurred horizontal stripes
Possible cause Step
Scratch on the 1 The horizontal stripes at 94 mm intervals?
drum
Toner stuck on 2 The horizontal stripes at 45 mm intervals?
the sleeve
Scratch on the
3
The horizontal streaks at 64 mm intervals?
fixing roller
I-8 Dropout
Possible cause Step
Transfer failure 1 Is the pressure spring of the upper shoot
cover come off?
High-voltage 2 Remove the main cover and measure the
power supply voltage at the transfer electrode plate at the
failure right side while printing with the interlocks
defeated.
Is the voltage correct?
Check
Check
IV - 8
Result Remedy
Yes Replace the drum unit
Yes Print several sheets and see
what happens.
The problem will be cured
itself after a while.
Replace the fixing unit.
Yes
Result Remedy
Yes Re-fit the spring.
No Replace the drum unit.
Yes Check the harness connection
between the high-voltage
power supply and the driver
PCB. If the connection is
normal, replace the high-
voltage power supply PCB.