Epson STYLUS COLOR 3000 Service Manual page 143

Troubleshooting
Table 5-6. Component Repair of the C203 Main Board (continued)
Condition
Symptom: The pump does not operate normally.
The pump motor does
not operate normally.
Symptom: The printer does not perform the self-test.
The printer does not
perform the self-test.
5-14
Cause
Sub gate array IC6 Check the waveform for one of the
is defective. following signals output from the
IC18: PUA0/1 (Pin1/2)
IC18 is defective. Check the waveform for one of the
following signals from IC18:
(Refer to the waveform 11.)
The pump motor is Check if the resistance of the
defective. motor coil is as follows;
Sub gate array IC6 Run a Self-test and check the
is defective. waveforms for the signals SBDATA
(Pin 24) and SCDATA (Pin 24)
output from IC22:
Pin 24 on the IC22
Pin 18 on the CN21
CPU is defective.
Common driver IC Check the common signal
22 and IC23 are waveform output from one of the
defective. following pins:
(Refer to waveform 12.)
Fuse is blown. Check the continuity of fuse F1 on
the main board.
Printhead is
defective.
Checkpoint
PUB0/1 (Pin23/24).
Pin 18 on the IC18
Pin 24 on the IC18
Waveform 11
A (Pin 6), /A (Pin 3)
B (Pin 18) /B (Pin 21)
7.7 Ω ± 10 % at 25°C
(Refer to Table 5-1.)
Waveform 12

CN21:Pin 18, 19, or 20
CN18:Pin 20, 21 or 22

EPSON Stylus Color 3000 Service Manual
Solution
Replace the main
board.
Replace the main
board or IC18.
Replace the main
board.
Replace the main
board.
Replace the main
board or IC22 and
IC23.
Replace the main
board or the fuse.
Replace the
printhead.