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Brother DP-525CJ Service Manual: Rs-232c Test ("echo Back"); Fig. 3.33 Rs232c Echo-back Test Start Display

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REPAIR
SERVICE MANUAL
7.3.8.
RS232C
The RS232C test executes the echo-back test for all models except DP-525CJ and LW-
800ic.
(1) Test procedure
From the Self Test menu, press "C". The following display appears and the RC232C
echo-back test starts. Once the test starts, the operation instructions given on the
display show the procedure to follow.
Working
(2) Check Procedures
1) Start the test with all RS232C serial port terminals open. The status of the signal is
checked in the following order:
1
Checks that CTS = HIGH and CD = HIGH regardless of the HIGH/LOW state
of RTS
2
Checks that DSR = HIGH regardless of the HIGH/LOW state of DTR
3
Checks that data is not received at RXD by sending the data* from TXD
As the test data, 00(H), FF(H), 55(H), and AA(H) are sent.
2) If the results of the test are normal, the following message is displayed.
Connect echo back test connector and press RETURN.
*****
RS-232C TEST

Fig. 3.33 RS232C Echo-Back Test Start Display

3-49
*****
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