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Service Manual
Troubleshooting
5.3
REPAIR OF THE POWER SUPPLY CIRCUIT
This section provides detailed troubleshooting methods to isolate components in the power supply
or on the main board. This information is for use by servicers who repair to the component level.
U.S. servicers repair to the unit level only, and may ignore this section.
The table below provides causes, checkpoints, and solutions for different power supply circuit
problems. The checkpoints include waveforms for normal operation. By referring to the
checkpoints, determine the defective component. Then perform the proper repair. The table
provides the following four columns:
Symptom:
Check this column for a list of common printer problems.
Cause:
Use this column to identify possible causes that could produce this symptom.
Checkpoint:
Follow the troubleshooting checks in this column to isolate your problem.
Solution:
Repair the printer using the instructions in this column.
Table 5-4.
Board Assembly Main Parts List
Location
Name
Description
PWM switching controller
(A/B)
NJM2903
Comparator (voltage drop monitor for the two +35 VDC lines)
Q101
531
Main switching
Q201
Main switching
Table 5-5.
Board Assembly Component Repair
Symptom
Cause
Checkpoint
Solution
No
DC
voltage
The
VPC signal
Look at the voltage waveform from
Replace the
is present at the
(HIGH level) is not
the gate array on the main board and
gate array or
output.
being sent from the
check the head driver voltage
head driver
main board.
waveform. (Refer to Table 5-6.)
on the main
board.
The
signal
Measure the voltage level of the
Replace the
is HIGH.
signal at
head
driver
on the main
board.
signal is
Measure the voltage level of the
Wait until the
HIGH.
signal at
printer prints
again.
Fuse blows
The line filter circuit
Check if any of pins
or RI is
Replace the
immediately
is defective.
shorting the AC line.
abnormal
after
element.
replacement.
Rev.
5-13
Содержание C117001-N - DFX 5000+ B/W Dot-matrix Printer
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Страница 155: ...Troubleshooting DlW50 Service Wnual Table 5 6 C117 MAIN Board Assembly Component Repair continued u 5 18 Rev A ...
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Страница 180: ...DFX 5000 Service Manual Appendix O I 1 T I I J I Figure A 3 C117 PSB Board Assembly Circuit Diagram Rev A A 1 1 ...
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