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Brother DP-525CJ Service Manual Page 73

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Troubleshooting
6
Problem: The line feed (LF) motor does not normally.
Points to Check
Is the LF motor turning activated ? is
it noisy?
Are any motor harness wires
damaged?
Are there binds in the LF motor or
gear train?
Is the LF motor gear loose or worn?
Is the resistance between the pin 5
of the LF motor and each phase
normal?(about 60 )Phases
1); B(5-2);C(5-3); D(5-4)
Are LF motor drive pulses output
from the pin131-134 of #8 when
printing?
Is output at the output pin of
transistors Q23-Q26 on and off
according the drive pulses indicated
above?
7
Problem: The buzzer does not sound.
Points to Check
Are pulses of 4kHz present on one
pin and about 5V present at the
other pin of buzzer BZ1?
8
Problem: Power in on, but nothing appears on the LCD.
Points to Check
Is the contrast setting correct?
Is the LCD harness free of
breakage?
Is the correct voltage (about -16V)
applied to the LCD on pin 2 of
connector CN7 of the Main PCB?
(without 640
400 LCD)
Probable Cause
Defective LF motor
Defective motor wiring
harness
Worn, dirty, damaged,
or obstructed gear
train, improper gear
backlash
Loose motor screws or
worn LF motor gear
Defective LF motor
(broken motor wire or
defective connector)
A(5-
Defective #8 (Main
PCB)
Defective transistor
Q23-Q26 or circuit on
the Main PCB
Probable Cause
If YES, defective
buzzer
If NO, defective Main
PCB.
Probable Cause
Faulty contrast
adjustment
Broken LCD harness
Incorrect power supply
voltage to LCD module
3-10
SERVICE MANUAL
Corrective Action
Replace LF motor.
Replace LF motor.
Clean/remove
obstructions. Space
motor from gear.
Replace damaged
gear(s).
Tighten motor screws.
Replace LF motor.
Replace the LF motor
assembly.
Replace the Main
PCB.
Replace the Main
PCB.
Corrective Action
Replace the buzzer.
Replace the Main
PCB.
Corrective Action
Re-adjust.
Replace the harness.
Replace the Main
PCB.
REPAIR
Repair
Replace #8.
Replace Q23-
Q26.
Repair
Replace #8.
Repair

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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