User Manual

EPSON Stylus Color 440/640/740 Revision A
Chapter 3 Troubleshooting 93
(Continued)
The printer does not
operate at all.
(Continued)
CPU does not operate.
(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 740:
• Replace IC1, or IC2.
• Replace IC3.
• Replace IC4 or IC5.
• Replace IC6.
Stylus Color 440:
CRU2 is dead.
Stylus Color 640:
CR2 is dead.
Stylus Color 740:
CR1 or IC2 is dead.
Stylus Color 440, 640:
Check the waveform at
27,28-pin of IC1.
Stylus Color 740:
Check the waveform at
118 or 119-pin of IC2.
And check the output
waveform at 91-pin of
IC2.
Stylus Color 440, 640:
Replace CRU2 or CR2.
Stylus Color 740:
Replace CR1 or IC2.
The carriage does not
operate normally.
(Continues to the next
page.)
Carriage motor does not
operate at all or it occurs a
abnormal noise.
(Continues to the next
page.)
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.
Replace IC2.
Table 3-6. Unit Repair of Main Board
Symptoms Condition Cause Check Point Solution