Epson STYLUS Scan 2500 Service Manual page 72

EPSON Stylus Scan 2500
Table 3-9. Carriage Unit does not operate (cont.)
Cause Step Checkpoint
Disconnect the connector
CN6 on the control board,
then using the tester,
check the coil resistance
between Pin2 and 4 and
between Pin1 and 3. Is the
resistance of 2 points
about 6.2
If any motor coil is
shorted, check the CR
CR Motor is
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
or 4 for CN1 on the control
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
board is 4
broken.
Troubleshooting
Finding Solution
Replace the CR
No
motor.
Replace the
No
power board.
Replace the
--- ---
control board.
Scanner Troubleshooting
Table 3-10. Carriage unit crashes into frame
Cause Step
Check the signal
level.
• Check the
signal/status
level between
C(+) and E(-) for
CR home position
1
PC2.
sensor is broken.
H(about 4.5V)/
when PC1-PC2 is
closed.
L(0.3V)/when PC1
-PC2 is opened.
Table 3-11. The lamp does not light up.
Cause Step
Connector CN5 on Is the connector CN5
the control board is 1 on the control board
disconnected. disconnected?
Connector CN1 or
Is the connector CN1
CN2 on the CCD
2 or CN2 on the CCD
board
board disconnected?
disconnected.
Lamp is not Is the lamp
connected properly connected properly
3
on the inverter on the inverter
board. board?
Does the lamp light
Lamp is broken. 4
after it is replaced?
Does it operate
Inverter board is
5 properly after
broken.
replacing it?
Control board is
6
broken.
Revision A
Checkpoint Finding Solution
Replace the CR
home position
-- sensor(PC1/PC2)
on the control
board.
Checkpoint Finding
Connect CN5
Yes
properly.
Connect CN1 or
Yes
2 properly.
Connect the
No
lamp properly.
Replace the
Yes
lamp.
Replace the
Yes
inverter board.
Replace the
--- ---
control board.
Solution
72