Troubleshooting
Rev. A
5-11
5.3 Repair of C124 PSB/PSE Board
This section describes how to repair the PSB/PSE board to the component. Table 5-8 shows the
abnormal conditions and corresponding causes, check points and solutions. Select the condition
from the table and perform any necessary check and repair.
Table 5-8. C124 PSB/PSE Board Repair
Condition
Cause
Check point
Solution
Symptom : Normal voltage is not output.
Fuse is blown
out soon after
replaced.
Line filter circuit
is defective.
Check
to
or L4 for a short circuit
with the AC line.
Replace any
defective
component.
Rectification or
smoothing
circuit is
defective.
Check the followings for short circuit:
All (+) terminals between
and
and
(See Note 1.)
Replace the
board,
or any
associated
defective
component.
All output
voltages are
abnormal.
(Due to the
circuit structure,
when the +35 V
Diode bridge
is
defective.
Check that the voltage output from pin
3 (+) and pin 4 (-) on DB101 is as
follows:
: Approximately 170V
: Approximately 300V
(See Note 2.)
Replace the
board,
or any
associated
defective
component.
output is
abnormal, all
other output
voltages are
affected.)
Soft start circuit
(surge circuit) is
defective.
Check that DC voltages at the both
ends of R2 and R3 are 0 V.
R2 and R3 are open,
is bad,
or R124, D103, or
/
which
are used to turn on
is bad.
Replace
board or
any associated
defective
component.
Switching FET
or
is
defective.
Check for the correct switching
operation of
/
by checking if
the waveform output from pins 6 and
7 of the T101/201 primary coil is
correct, as shown below.
Figure 5-9. Switching Waveform
Replace the
/
board,
or any
associated
defective
component.
Notes:
1.
is possibly shortened as a result of the short circuit of other components behind
.
2. Degradation of some component behind
may suppress the
output voltage
Summary of Contents for DLQ-3000+
Page 1: ...EPSON EPSON EPSON France S A SERVICE MANUAL DLQ 3000 PRODUIT ...
Page 2: ...EPSON 24 PIN DOT MATRIX PRINTER EPSON DLQ 3000 SERVICE MANUAL SEIKO EPSON CORPORATION 4008259 ...
Page 6: ...v REVISION SHEET Revision Issued Data Contents Rev A August 21 1997 First Release ...
Page 62: ...2 3 12 Other Sensor Circuits 2 30 ...
Page 160: ...Chapter 6 Maintenance 6 1 Maintenance 6 1 6 1 1 Lubrication and Adhesion 6 1 ...
Page 171: ...DLQ 3000 Rev A A 6 ...
Page 172: ...Appendix Rev A A 7 A 2 Circuit Diagrams Figure A 2 C210 MAIN Board Circuit Diagram 1 2 ...
Page 173: ...DLQ 3000 Rev A A 8 ...
Page 174: ...Appendix Rev A A 9 Figure A 3 C210 MAIN Board Circuit Diagram 2 2 ...
Page 175: ...DLQ 3000 Rev A A 10 ...
Page 177: ...DLQ 3000 Rev A A 12 Figure A 5 C124 PSB Board Circuit Diagram ...
Page 180: ...Appendix Rev A A 15 Figure A 8 C210 MAIN Board Component Layout 2 2 ...
Page 181: ...DLQ 3000 Rev A A 16 Figure A 9 C124 PSB Board Component Layout ...
Page 182: ...Appendix Rev A A 17 Figure A 10 C124 PSE Board Component Layout ...
Page 189: ...EPSON SEIKO EPSON CORPORATION ...
Page 254: ...PC 437 USA Europe standard Annexe A 27 ...
Page 255: ...PC 850 Multilingue PC 860 Portugais PC 863 Français canadien PC 865 Norvégien A 28 Annexe ...
Page 256: ...PC861 Islandais BRASCII Portugais brésilien Abicomp Portugais brésilien Annexe A 29 ...
Page 259: ...A 32 Annexe ...
Page 262: ...Utilisation du sommaire des commandes A 10 V Vitesse 2 25 W Windows Microsoft 1 17 18 Index 3 ...