
Troubleshooting
Rev. A
5-13
Table 5-10 . C124 PSB/PSE Board Repair (continued)
Condition
Cause
Check point
Solution
Symptom : Normal voltage is not output. (continued)
(continued)
All output
voltages are
abnormal.
+35 VDC
stabilizing circuit
is defective.
Check the waveform output from pin
4 of the photo-coupler
PC101/ PC201
is
as shown below. (Constant wave-
form should be output when the
printer is in normal and stand-by
status.)
−
If the correct waveform as shown
below is output, check
Q101/Q201
for
the switching waveform. Then,
check operation of the Q102/Q202,
Q103/Q203 and peripheral circuit
parts.
−
If the waveform is abnormal,
PC101/PC201, ZD151, ZD181–ZD185
or any peripheral circuit part is
defective.
Figure 5-10. PC101/PC201 Waveform
Replace the
PSB/PSE
board
or any
associated
faulty part.
Output of +5 V
is abnormal,
while output of
+35 V is normal.
IC151
is
defective.
Check pin 21 of
IC151
for the output
voltage.
If it’s abnormal,
IC151
is defective.
Replace the
PSB/PSE
board,
IC151
or faulty
peripheral parts.
Smoothing
circuit is
defective.
Check if the correct voltage
(approximately 5 V) is input between
(+) and (-) terminals of
IC154
.
If not,
L151
or
C154
is defective.
Replace the
PSB/PSE
board,
L151
, or
C154
.
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 ...