Troubleshooting Image Defect - Brother HL-S7000DN Service Manual

4.3.2

Troubleshooting image defect

Image defect related problems are user recoverable if following the User Check items.
If the same problem occurs again, follow each procedure in the order of the number described
in the Step column in the tables below.
■ Light
Step
1
2
3
4
5
■ Faulty registration
Step
1
2
■ Dark
Step
1
2
3
<User Check>
- If the whole page is light, ink save mode may be ON. Turn OFF the ink
save mode.
- Adjust density by density adjustment.
- Perform head cleaning.
Cause
Old ink
Ink head failure
Power supply PCB failure
Engine PCB failure
Main PCB failure
<User Check>
-
Cause
Wrong write alignment value
Dirt on print starting sensor
<User Check>
- Adjust concentration by concentration adjustment.
Cause
Ink head PCB failure
Engine PCB failure
Main PCB failure
Replace the Ink cartridge and clean the head.
Replace the ink head.
Replace the power supply PCB.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
- Check whether appropriate paper type is selected on
the driver.
Refer to "Printing of the test pattern for the
print start position and adjustments" of
"1.4.18 Print adjustment (Function code 68)"
in Chapter 5 and reenter the value.
Wipe the print starting sensor.
Replace the ink head.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
2-118
Remedy
Remedy
Remedy
Confidential