Brother MFC-8540DN Service Manual

2-50
Confidential
 Error code 6A00
Detected discharge that may be attributable to dirty corona wire on the drum unit.
 Error code 6D00
Detected more LTs than connectible limit.
 Error code 6F00
Detected irregular power supply for less than 100 times.
<User Check>
• Slide the green tab of the drum unit to left and right for two to three times to clean the
corona wire.
• Clean the electrode of the drum unit.
• Replace the drum unit.
Step Cause Remedy
1
Dirt on the high-voltage power
supply PCB terminal
Clean the electrodes of the machine.
(Refer to Fig. 2-9.)
2
High-voltage power supply PCB
attachment failure
Check if each electrode comes back smoothly
after pressing it. If not, reattach each electrode.
3
High-voltage power supply PCB
failure
Replace the high-voltage power supply PCB
ASSY.
4 Main PCB failure Replace the main PCB ASSY.
<User Check>
• Reduce LTs to acceptable numbers.
• Reconnect LTs.
Step Cause Remedy
1
Dust around the LT/TT
connector
Clean the LT/TT connector.
2
Malfunction of the LT control
PCB
Install the latest main firmware.
3
Machine or LT/TT connector
failure
Replace the machine or LT/TT connector.
4 LT control PCB failure Replace a LT control PCB ASSY.
5 Main PCB failure Replace the main PCB ASSY.
<User Check>
• Turn the power switch OFF and then back ON again.
• Use a noise filter on the power supply.
• Install a voltage stabilizer to the power supply unit.

Brother MFC-8540DN Specifications

General

Brand	Brother
Model	MFC-8540DN
Category	All in One Printer
Language	English