Epson DFX-8500 service manual

DFX-8500

Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 7/7

Symptom	Cause	Checkpoint	Solution
The self-test is	IC1 on the C204	Observe the output signal at pins 136-	Replace IC1.
printed incorrectly	MAIN board is	181 of IC1.
	defective.
	The head driver FETs	Observe the voltage waveform at the	Replace the
	on the C204 MAIN	each FET drain side.	abnormal FET.
	and/or C204 DRV-B
	boards are defective.
	The CPU (IC2) on the	Observe the signals at pins 38 (PTS1)	Replace the IC2.
	C204 MAIN board is	and 42 (PTS2) of the IC2
	defective.

5-22 Rev. B