Epson Stylus Color 640 Service Manual page 93

EPSON Stylus Color 440/640/740
Symptoms Condition
(Continued) (Continued)
The printer does not CPU does not operate.
operate at all.
The carriage does not Carriage motor does not
operate normally. operate at all or it occurs a
abnormal noise.
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(Continues to the next
page.)
page.)
Chapter 3 Troubleshooting
Table 3-6. Unit Repair of Main Board
Cause Check Point
(Continued) Stylus Color 740:
• If you can not find the waveform at 2, 128, 127-pin of IC1,
the IC1 is dead, and if you can not find the waveform at 85-
pin of IC2, the IC2 is dead.
• If you can not find the waveform at 13-pin of IC3, the IC3 is
dead.
• If you can not find the waveform at 27-pin of IC4 or IC5, the
IC4 or IC5 is dead.
• If you can not find the waveform at 14-pin of IC6, the IC6 is
dead.
Stylus Color 440: Stylus Color 440, 640:
CRU2 is dead. Check the waveform at
27,28-pin of IC1.
Stylus Color 740:
Stylus Color 640:
Check the waveform at
CR2 is dead.
118 or 119-pin of IC2.
And check the output
Stylus Color 740:
waveform at 91-pin of
CR1 or IC2 is dead.
IC2.
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 IC14.
Stylus Color 740:
Check the waveform at
27, 16 pin of IC11.
Revision A
Solution
Stylus Color 740:
• Replace IC1, or IC2.
• Replace IC3.
• Replace IC4 or IC5.
• Replace IC6.
Stylus Color 440, 640:
Replace CRU2 or CR2.
Stylus Color 740:
Replace CR1 or IC2.
Replace IC2.
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