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Brother DP-525CJ Service Manual: Generator; Fig. 2.3 Timing Chart Of +24v Generation Circuit; Fig. 2.4 Timing Chart Of +5v Generation Circuit

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SERVICE MANUAL
3.2.
+24V Generator
The timing chart of the +24V generation circuit during idling is shown in Fig. 2.3.
Switching Q6 by #4 at 100 kHz boosts the input to a stable +24V.
Energy is accumulated in L1 while Q6 is ON and the power is transmitted to the output
side by the back electromotive force generated from the moment Q6 is turned OFF.
Stabilization to +24V is achieved by changing the ON-OFF duty ratio of Q6.
3.3.
+5V Generator
The timing chart of the +5V generation circuit during idling is shown in Fig. 2.4.
Switching Q12 by #4 at 100 kHz reduces the input voltage to a stable +5V.
While Q12 is ON, energy is supplied to L3, C31, and load. The energy accumulated in
L3 is supplied to load through D2. Stabilization to +5V is achieved by changing the ON-
OFF duty ratio of Q6.

Fig. 2.3 Timing Chart of +24V Generation Circuit

Fig. 2.4 Timing Chart of +5V Generation Circuit

2-5
THEORY
Electrical

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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