Epson Stylus Color 640 Service Manual page 95

EPSON Stylus Color 440/640/740
Symptoms Condition
Paper feed operation is Paper feed motor does not
abnormal. work.
Chapter 3 Troubleshooting
Table 3-6. Unit Repair of Main Board
Cause Check Point
IC2 is dead. Stylus Color 440:
Check the waveform at
25, 18 pin of IC14.
Stylus Color 640:
Check the waveform at
43, 26 pin of IC16.
Stylus Color 740:
Check the waveform at
Pin 7 of IC12 and IC13.
Stylus Color 440, 640: Stylus Color 440:
IC15 is dead. Check the output
waveform of at 6-9 pin of
IC15.
Stylus Color 740:
Stylus Color 640:
IC12 or IC13 is
Check the output
dead.
waveform of at 3,
6,18,21pin of IC15.
Stylus Color 740:
Check the output
waveform of at 10, 15
pin of IC12 and IC13.
Revision A
Solution
Replace IC2
Stylus Color 440, 640:
Replace IC15
Stylus Color 740:
Replace IC12, IC13.
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