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Brother DP-525CJ Service Manual: Checks After Repair

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Run the appropriate Self Test operation (from the software) for the suspected problem
before attempting any mechanical or electrical troubleshooting.
Supply voltage: Check the AC input voltage and DC supply voltage for all sections.
Make sure they meet specified voltage values.
Connectors: Check all connectors and make sure they are tight.
Fuses: Check for blown fuses (F1 and the thermo-fuse inside the AC adapter).
In the logic control circuit, it is difficult to isolate faulty points in areas connected tot he
CPU by the address bus or the data bus. If a suspected problem involves the address
bus or data bus, first check the solder bridge and the cut circuit pattern. If a faulty point
cannot be isolated, replace the peripheral devices or the PCB.

Checks After Repair

After completing a repair, check to confirm that the trouble has been eliminated. Also,
record the troubleshooting procedures used for reference.


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  • brian aaron Jan 27, 2017 03:48:
    ​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​