EPSON Stylus COLOR 3000
Rev. A
5-11
5.4 Component Repair of the C203 MAIN Board
This section provides information which enables you to repair and replace defective components on the
C203 MAIN board. Table 5-6 and 5-7 lists the causes for each symptom in order of possibility, with which
you are able to find and repair the defective part.
Table 5-6. Component Repair of the C211 MAIN Board
Condition Cause Checkpoint Solution
Symptom : The printer does not operate at all.
Reset circuit is
defective.
Check the following signals for the
waveforms:
IC9:/
IC3:
+5V
RE
SE
T
Waveform
(6)
Replace the MAIN
board or the reset IC.
CPU doesn’t operate.
(The driver mechanism
doesn’t operate properly
at power on/off.)
Selection of ROM
and sub gate array
is improper.
Check the waveform for one of the
following signals output from the
CPU (IC5) for the change in the
signal High and Low :
/CS0 (Pin 1), /CS1 (Pin 2),
/CS2 (Pin128), /CS3 (Pin 127)
Waveform (7)
Replace the MAIN
board.
CG-ROM or PROM is defective. Replace the MAIN
board or PROM.
CPU is defective. Check the waveform for one of the
following signals output from the
CPU (IC5):
XTAL (Pin 85), EXTAL (Pin 86)
X
T
A
L
Waveform (8)
Replace the MAIN
board or CRU1.
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