Epson Stylus COLOR 440 Service Manual page 89

EPSON Stylus COLOR 440, 640, and 740
Symptoms Condition
(Continued) (Continued)
The carriage does not The carriage motor does
operate normally. not operate at all or it
produces an abnormal
noise.
Printing is abnormal. The printer does not print.
Table 3-6. Unit Repair of Main Board (continued)
Cause Check Point
Stylus COLOR 440, 640: Stylus COLOR 440:
IC14 is dead. Check the waveform at Pins
6 through 9 of IC14.
Stylus COLOR 640:
Stylus COLOR 740:
Check the waveform at Pins
IC11 is defective.
3, 6, 18, and 21of IC14.
Stylus COLOR 740:
Check the waveform at Pins
6 through 9 of IC11.
Stylus COLOR 440:
The trapezoidal waveform
is not being generated.
Check the trapezoidal waveform at the base of Q7 or Q9 on
the C206 Main-B or C255 Main board.
Stylus COLOR 640:
Check the trapezoidal waveform at the base of Q7 or Q9 on
the C256 Main board.
Stylus COLOR 740:
Check the trapezoidal waveform at the base of Q2 or Q3 on
the C257 Main board.
IC2 is defective. Stylus COLOR 440, 640:
Check the clock signal for
the trapezoidal waveform
at Pin 80 of IC2.
Stylus COLOR 740:
Check the clock signal for
the trapezoidal waveform
at Pin 174 of IC2.
Chapter 3 Troubleshooting
Solution
Stylus COLOR 440, 640:
Replace IC14.
Stylus COLOR 740:
Replace IC11.
Stylus COLOR 440:
Replace IC6, Q7, or Q9.
Stylus COLOR 640:
Replace IC7, Q7, or Q9.
Stylus COLOR 740:
Replace IC14, Q2, or Q3.
Replace IC2.
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