Epson Stylus COLOR 300 Service Manual page 33

5.1 OVERVIEW
Since the printer mechanism and the power supply unit are remains the same with EPSON
Stylus Color 200/Stylus 200, this chapter describes only the checkpoints on the main control
circuit; C224 MAIN Board.
5.1.1 Unit Repair - C224 MAIN Board
The table below provides various symptom, likely causes and checkpoint, relating to the
C224 MAIN Board.
Symptom Condition
Printer does CPU does
not operate not operate.
at all.
ASIC does
not operate.
Rev. A
Cause
Reset IC (IC9) Check the signal waveform at pin 6 of
is defective IC9:
Oscillator Is the signal waveform output from CR2
(CR2) or CPU correct at pin 37/38?
(IC2) is
defective
ASIC (IC1) is Is the signal waveform at pins 52 of IC1
defective correct?
Chapter 5 Troubleshooting
Checkpoint Solution
Replace IC9
Correct:
Replace IC2
Incorrect:
Replace CR2
Replace IC1
5-1