Epson DFX-8500 service manual

DFX-8500

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

Symptom	Cause	Checkpoint	Solution
Paper feeding is	The CPU IC2) on the	Check the PF motor phase drive	Replace IC2.
abnormal.	C204 MAIN board is	signals at pins 2 - 5 of IC2.
	defective.
	IC2 on the C204 DRV	At IC2, check the output signals for	Replace IC2.
	board is defective.	pins 2 (OUT_A), 3 (OUTXA), 6
		(OUT_B), and 7 (OUTXB).
Ribbon feeding is	The CPU IC2) on the	Check the RF motor phase drive	Replace IC2.
abnormal.	C204 MAIN board is	signals at pins 6 - 9 of IC2.
	defective.
	The common	Check the collector voltage of Q21.	Replace Q20 or
	switching transistor on		Q21.
	the C204 DRV board
	is defective.
	The phase switching	For transistors Q22 - Q25, observe the	if there is no output
	transistor on the C204	input signal from the CPU (base) and	signal, replace the
	DRV board is	the output signal (collector).	abnormal transistor.
	defective.
	Fuse F1 on the C204	Check if fuse F1 is defective.	Replace F1.
	DRV board is
	defective.

5-20 Rev. B