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5.3 Unit Repair - C199 Main Control Board
This section describes the problems related to the main controller board (C199 Main). The table below
provides various symptoms, likely causes, and checkpoints. The checkpoints refer to waveforms, resistance,
and other values to be checked to evaluate the operation of each component.
Phenomenon Condition Cause Checkpoints Solution
It does not
operate at all.
CPU does
not operate.
Reset circuit
does not
operate.
Check the wave-form
at either pin 1 and 4(GND).
Replace IC13.
Table 5-4. Repair of C199 MAIN
CRU1 or IC2
is defective.
Does wave-form of CRU1 is correct?
(at either pin 37 and 38 of CPU)
Correct : replace IC2.
Incorrect : replace
CRU1.
CRU2 or IC1
is defective.
Does wave-form of CRU2 is correct?
(Refer to above wave-form.)
Correct : replace IC1.
Incorrect : replace
CRU2.
Gate array
does not
operate.
Check the wave-form at the pin
(52,54,56,57,58).
Replace IC1.
OE signal
does not
output.
Gate array
does not
operate.
Check the wave-form at the pin 3 of QM3.
Does PWM wave-form is correct?
(Check the pin at 140.)
Replace IC1.
Self-test
printing
does not
abnormal.
PWM signal
does not
output.
Common
driver circuit
does not
operate.
Tr does
not operate.
Replace a defective
element.(QM1,2,3,4,
5,6,7,8 or Q1,7,8.)
Troubleshooting Epson Stylus Color 200 / Epson Stylus 200
5-4 Rev. A