Epson GT-9000 Service Manual page 72

Cause
The B027 PSB/PSE board
may be dead.
The carriage mechanism is
defective.
The CR motor is defective.
be dead.
Rev.
Table 5-7. Carriage Does Not Move
Step Checkpoint
the power on, is there
With
an output of +24VDC
,
between pin 1 (+) and pin 3
(-) for CN3 on B027
Turn off the scanner and try
to move the carriage
manually. Does the
carriage move smoothly?
Disconnect CN6
a multimeter to check the
coil resistance between: pin
2 and pin 4, and pin 1 and
pin 3(2 points total) on the
disconnected cable side.
Pin 2- Pin 4
Pin 1- Pin 3
Are the resistances of the
two points above
approximately 4.7 ohms?
If any coil is shorted, check
the CR motor driver circuit
3
using the following
procedure:
1. Set the multimeter to
resistance check mode.
2. Place the (-) terminal of
the multimeter on pins 1,
2, 3, and 4 of connector
board.
3. Place the (+) terminal on
pin 6 of connector CN1
on the B027 MAIN boefd
With the power off, does the
4 —
Finding
Replace the 6027
No
Check the
carriage
mechanism, and
No
replace or
reassemble the
affected parts.
on the
Replace the CR
motor. If any coil
is shorted, follow
the steps below to
check the driver.
Replace the CR
motor and 6027
No
MAIN board at the
same time.
Replace the B027
—
MAIN board.
Troubleshooting
Solution