Brother DCP-L5500D Service Manual page 85

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