Epson DFX-8500 service manual 2 C204 MAIN/DRV/DRV-B Boards Repair

DFX-8500

5.2.2 C204 MAIN/DRV/DRV-B Boards Repair

Table 5-6 indicates major components which is used for the C204 MAIN/DRV/DRV-B boards and Table 5-7 shows the C204 MAIN/DRV/DRV-B boards component level troubleshooting.

Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 1/7

Symptom	Cause	Checkpoint	Solution
The printer does	The DRERR signal	Check the logic level of the DRERR	Replace the head
not operate at all.	was sent to the C204	signal at CN10 or check the VP1 and	driver on the C204
	power supply board	VP2 voltage.	MAIN board (VP1)
	(HIGH level turns off		or C204 DRV-B
	the power supply).		board (VP2).
	The PD signal was	Check the logic level of the PD signal	Replace the head
	sent to the C204	during power on and verify the voltage	driver or gate array.
	power supply board.	waveform for the head driver. (Refer to
	(HIGH level turns off	the head driver waveform figure,
	the power supply)	above.)
	The reset circuit is not	Check the logic level at pin1 (VOUT) of	Replace IC13.
	operational (for logic).	IC13.
The driver circuits	The pull up voltage	When the collector of Q15 is high	Replace Q15.
don’t operate at	VX is not generated.	Check the logic level at collector of Q14
all.		(VX) (When the collector of Q15 is
		high, VX is HIGH..
Serial interface is	The level converter IC	Check the signal level change between	Replace IC9.
dead.	is defective.	in and out port of the IC9.

5-16 Rev. B