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Brother DP-525CJ Service Manual Page 71

Word processor.
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Troubleshooting
Points to Check
Does the signal level at pin 1 of
CN13 remain HIGH when the
carriage index switch is closed?
Is the carriage index switch
connected to CN13?
4
Problem: Keys malfunction (do not insert characters or insert wrong characters)
Points to Check
Is the key top and the key actuator
correctly mounted?
Is the keyboard FPC securely
connected to Main PCB CN12?
When a bad key is pressed, does
the matrix row in which the pressed
key is connected go LOW in
synchronization with the output
timing of output drive #8?
Is solder present at the correct
country specification change-over
solder point?
5
Problem: [Abnormal Printing]
• Voids in characters
• Prints satellites
• Print head dries out prematurely
• Ink smearing
• Print lines crowded
• Will not print in color
Points to Check
(1) Print Cartridge:
Is the ink cartridge good, and is
it properly installed?
After executing the purge (auto
printhead cleaning) function from
the keyboard
(CODE+SHIFT+INK CHG), are
there still printing problems?
(2) Printhead Carriage Assembly:
Is the flat cable firmly connected
in the Main PCB?
Probable Cause
Broken wire in the
carriage index switch
assembly
Incorrect connection
Probable Cause
Faulty keyboard
assembly
Keyboard PCB not
connected properly.
If YES, faulty Main
PCB.
If NO, faulty keyboard.
Incorrect or faulty
solder point for
specified country
(language)
• Light print
• Carrier moves, but does not print
• Vertical streaks on paper
• Gaps or overlapped areas in print
• Colors will not print correctly.
Probable Cause
Cartridge empty, dried
out, or not locked in
and aligned with
contacts in carriage.
Dirty or clogged ink jet
nozzles
Loose or worn
printhead flat cable.
3-8
SERVICE MANUAL
Corrective Action
Replace the carriage
index switch assembly
(after confirming
discontinuity).
Reconnect.
Corrective Action
Replace the
keyboard.
Reconnect.
Replace the Main
PCB.
Replace the
keyboard.
Verify and correct
solder point.
• Prints off the page
• Vertical alignment off
Corrective Action
Replace with a new
cartridge, and/or
properly install the ink
cartridge.
Replace the ink
cartridge and run the
Self-Print test, and/or
replace the printer flat
cable.
Reconnect loose flat
cable or replace it.
REPAIR
Repair
Repair
Repair
Replace the ink
cartridge
and/or the
printer flat
cable.
Replace flat
cable.

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Troubleshooting

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  • brian aaron Jan 27, 2017 03:48:
    1-26-2017
    ​I have a brother dp 540cj and it has a built in diskette drive.
    I have a ibm thinkpad latop. I connected a Memorex external usb floppy drive to the ibm thinkpad laptop. i'm copying 3 files from the ibm thinkpap (notepad) to the square 1.44 mb diskette. no problem, the 3 files were copied to the diskette.
    ​I turn on the brother dp 540cj, select file manager, insert the square diskette. the brother dp 540cj open only the file names on the disk. I try to open word text on either of the 3 files on the disk and the brother dp 540cj don't open the word text in any of the 3 files. I have been trying for several days to open the word text on the files using the brother dp 540cj and don't have any further instructio​ns for this problem. I tried saving the file names to all coding - Unicode, ansi utf-8 and can't fix the electronic problem.
    m​y email address is snowwash@j​uno.com