Epson Stylus Color 640 User Manual

EPSON Stylus Color 440/640/740 Revision A
Chapter 3 Troubleshooting 92
Table 3-6. Unit Repair of Main Board
Symptoms Condition Cause Check Point Solution
The printer does not
operate at all.
(Continues to the next
page.)
CPU does not operate.
(Continues to the next
page.)
The reset circuit does not
operate.
Stylus Color 440, 640:
Check the waveform of the
+5V and /Reset signal
(IC9=Pin 7, 6-pin)
Replace IC9.
Stylus Color 740:
Check the waveform of the
+5V and /Reset signal
(IC8=2-pin, Pin 7)
Replace IC8.
Control ROM, D- RAM,
and Mask ROM are not
selected correctly or it’s
dead.
(Continues to the next
page.)
Stylus Color 440:
If you can not find the waveform at 88-pin of IC1, the IC1 is
dead, and if you can not find it at 20-pin of IC3 or 26-pin of
IC4, the IC3 or IC4 is dead.
Stylus Color 440:
Replace IC1, IC3, or IC4.
Stylus Color 640:
If you can not find the waveform at 97-pin of IC1, the IC1 is
dead, and if you can not find it at 13-pin of IC3, the IC3 is
dead. If you can not find the waveform at 98, 99-pin of IC1,
the IC1 is dead, and if you can not find it at 27-pin of IC5, and
at 14-pin of IC6, the IC5 or IC6 is dead.
Stylus Color 640:
Replace IC1, IC3, IC5, or IC6

Epson Stylus Color 640 Specifications

General

Brand	Epson
Model	Stylus Color 640
Category	Printer
Language	English