Epson DFX-8500 service manual Adjustments

			TROUBLESHOOTING
	Table 5-7. Printer Mechanism Repair 3/4
Symptom	Cause	Checkpoint		Solution
The RF motor	The parallelism value	Check whether the carriage moves		Perform the
does not operate.	is incorrect.	smoothly when moved manually.		parallelism
		(Check that foreign objects are not		adjustment, as
		lodged in the printer mechanism.)		described in Section
				4.1.5.
The RF motor	The RF motor is	Check the coil resistance of the RF		Replace the RF
does not operate.	defective.	motor. (It should be about 150 ohms +		motor.
		10 %.)
The PG motor	The backlash value is	Check whether the carriage guide shaft		Loosen the 2 screws
does not operate.	incorrect.	rotates smoothly when rotated		securing the PG
		manually.		motor to the left side
				frame. Then adjust
				the backlash
				between the PG
				motor pinion gear
				and the carriage
				guide shaft gear, as
				described in Chapter
				4, Adjustments.
	The PG encoder	Check the output signal of the PG		Replace the PG
	sensor is defective	encoder sensor. (Refer to Table 5-6.)		encoder sensor.
	The encoder plate is	Check whether the encoder plate is		Replace the PG
	defective.	broken or stained.		motor or clean the
				encoder plate.
	The PG home sensor	Check the continuity of the sensor.		Replace the PG
	is defective	(Check the status of the two micro		home sensor (micro
		switches.),		switch type).
	The PG motor is	Check the coil resistance of the PG		Replace the PG
	defective.	motor. (It should be about 250 ohms +		motor.
		18 ohms.)
Printing continues	The front, rear, or top	Check the PE sensor.		Replace the PE
past the end of	PE sensor is			sensor.
the paper.	defective.
When paper jams,	The paper jam sensor	Check the paper jam sensor.		Replace the paper
the printer does	is defective.			jam sensor.
not beep.
Ribbon Jam error	Ribbon jam sensor is	Check the ribbon jam sensor.		Replace the ribbon
occurs even the	defective.			jam sensor.
ribbon is fed
correctly.

Rev. B 5-25