
DLQ-3000+
Rev. A
5-12
Table 5-9. C124 PSB/PSE Board Repair (continued)
Condition
Cause
Check point
Solution
Symptom : Normal voltage is not output. (continued)
(continued)
All output
voltages are
abnormal.
T101
or
T201
is
defective.
Check
T101/T201
for the followings:
−
Pins 6/7 for the input voltage to the
primary coil
−
Output voltage of the corresponding
pins on the secondary side.
(See Note 1.)
Replace the
PSB/PSE
board,
T101/T201
or any
associated
defective
component.
Diode
D151
or
D251
is
defective.
Check that the correct voltage (+35V)
is output from the both terminals of
C151/C251
.
If no voltage is output,
T101/T201
is
defective.
Replace the
PSB/PSE
board,
D151/251
or any
associated
faulty part.
Over current
protection circuit
is defective.
Check the transistor
Q154.
(Collector is at Gp level.)
−
If it’s on, Q153/Q253 or other
peripheral circuit part is defective.
−
If it’s off, PC102 or components
behind or Q101/Q201 in the main
switching circuit is defective.
Replace the
PSB/PSE
board,
Q154
or any
associated
faulty part.
Over voltage
protection circuit
is defective.
Check the transistor
Q155
.
(Collector is at Gp level.)
−
If it’s on,
Q155, ZD153
or a peripheral
part of
Q155
is defective.
−
If it’s off, a circuit part behind
PC102
or
Q102
in the main switching circuit
is defective.
Check if
Q155
is on because the
voltage for
+5 V
line is abnormally
high.
−
If it’s on,
IC151
or a peripheral
circuit part is defective.
−
If it’s off,
PC102
is defective.
(See Note 2.)
Replace the
PSB/PSE
board,
Q155
or any
associated
faulty part.
Notes:
1. Degradation
of a component behind the secondary coil may suppress the T101/ T201
output voltage.
2.
Once
PC102 (
photo-thyristor) turns on, it does not turn off until
C111
is discharged. Therefore, be
sure to wait for a few minutes before turning the power on again.
Содержание DLQ-3000 Minerva+
Страница 1: ...EPSON 24 PIN DOT MATRIX PRINTER EPSON DLQ 3000 SERVICE MANUAL SEIKO EPSON CORPORATION 4008259 ...
Страница 5: ...v REVISION SHEET Revision Issued Data Contents Rev A August 21 1997 First Release ...
Страница 61: ...2 3 12 Other Sensor Circuits 2 31 ...
Страница 160: ...Chapter 6 Maintenance 6 1 Maintenance 6 1 6 1 1 Lubrication and Adhesion 6 1 ...
Страница 171: ...DLQ 3000 Rev A A 6 ...
Страница 172: ...Appendix Rev A A 7 A 2 Circuit Diagrams Figure A 2 C210 MAIN Board Circuit Diagram 1 2 ...
Страница 173: ...DLQ 3000 Rev A A 8 ...
Страница 174: ...Appendix Rev A A 9 Figure A 3 C210 MAIN Board Circuit Diagram 2 2 ...
Страница 175: ...DLQ 3000 Rev A A 10 ...
Страница 177: ...DLQ 3000 Rev A A 12 Figure A 5 C124 PSB Board Circuit Diagram ...
Страница 179: ...DLQ 3000 Rev A A 14 A 3 Circuit Board Component Layout Figure A 7 C210 MAIN Board Component Layout 1 2 ...
Страница 180: ...Appendix Rev A A 15 Figure A 8 C210 MAIN Board Component Layout 2 2 ...
Страница 181: ...DLQ 3000 Rev A A 16 Figure A 9 C124 PSB Board Component Layout ...
Страница 182: ...Appendix Rev A A 17 Figure A 10 C124 PSE Board Component Layout ...
Страница 189: ...EPSON SEIKO EPSON CORPORATION ...