Epson Scan 2500 service manual Carriage unit crashes into frame, The lamp does not light up

EPSON Stylus Scan 2500 Revision A

Table 3-9. Carriage Unit does not operate (cont.)

Cause	Step	Checkpoint	Finding	Solution
		Disconnect the connector
		CN6 on the control board,
		then using the tester,
		check the coil resistance	No	Replace the CR
		between Pin2 and 4 and		motor.
		between Pin1 and 3. Is the
		resistance of 2 points
		about 6.2Ω?
		If any motor coil is
CR Motor is		shorted, check the CR
		motor drive circuit in the
broken	3
		order below.
		1.)Set the tester on Ohms.
		2.)Place the (-) lead of the
		tester on any of Pins 1,2, 3	No	Replace the
		or 4 for CN1 on the control		power board.
		hoard.
		3.)Place the (+) lead of the
		tester on Pin 6/7 for CN4
		on the control board.
		With the scanner off, does
		the meter show “∞”?
Control				Replace the
board is	4	---	---
				control board.
broken.

Table 3-10. Carriage unit crashes into frame

Cause	Step		Checkpoint	Finding	Solution
		Check the signal
		level.
		•	Check the
			signal/status		Replace the CR
			level between
					home position
CR home position			C(+) and E(-) for
	1			--	sensor(PC1/PC2)
sensor is broken.			PC2.
					on the control
		H(about 4.5V)/
					board.
		when PC1-PC2 is
		closed.
		L(0.3V)/when PC1
		-PC2 is opened.

Table 3-11. The lamp does not light up.

Cause	Step	Checkpoint	Finding	Solution
Connector CN5 on		Is the connector CN5		Connect CN5
the control board is	1	on the control board	Yes
				properly.
disconnected.		disconnected?
Connector CN1 or		Is the connector CN1
CN2 on the CCD				Connect CN1 or
	2	or CN2 on the CCD	Yes
board				2 properly.
		board disconnected?
disconnected.
Lamp is not		Is the lamp
connected properly	3	connected properly	No	Connect the
on the inverter		on the inverter		lamp properly.
board.		board?
Lamp is broken.	4	Does the lamp light	Yes	Replace the
		after it is replaced?		lamp.
Inverter board is		Does it operate		Replace the
	5	properly after	Yes
broken.				inverter board.
		replacing it?
Control board is	6	---	---	Replace the
broken.				control board.

Troubleshooting Scanner Troubleshooting 72