Brother HL-1040 User Manual

Page 84

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background image

IV-17

I-19

Downward fogging of solid black

Possible cause

Step

Check

Result

Remedy

Drum unit

1

Is the problem solved after
replacing the drum unit?

Yes

Replace the drum unit.

High-voltage
power supply
PCB

2

Is the problem solved after
replacing the high-voltage
power supply PCB?

Yes

Replace the high-voltage
power supply PCB.

I-20

Horizontal lines

Possible cause

Step

Check

Result

Remedy

HV.GND

contacts

(Fig.4-

5,4-7)

SR electrode

1

Are the SR electrodes
between the printer body and
the drum unit dirty?

Yes

Clean both electrodes.

SR connection
failure

2

Are the SR electrodes
between the printer body and
the drum unit connected
correctly?

No

Check the SR
connection.

Feed roller

3

Are the feed roller shaft and
the ground contact
connected correctly?

No

Check the connection
between the shaft and
the ground contact.

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