Epson GT-9000 Service Manual page 70

Table 5-5. OPERATE LED Does Not Light
Cause
Connector CN1 on the B027
disconnected.
Connector CN3 on the B027
disconnected.
OPERATE switch may be
bad.
The fuse on the B027
blown.
The B027 PSB/PSE board
may be dead.
The coils of CR motor are
shorted.
Rev. A
Step Checkpoint
Is connector
1
disconnected?
Is connector CN3 on the
2
disconnected?
Disconnect connector CN3
on the B027 PSB/PSE
board and check the
OPERATE switch using a
Has the fuse blown on the
4
With the power on, is there
an output of +5 VDC
between pin 7 (+) and
pin 5 (-) for CN3 on B027
Disconnect CN6 on the
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 coils of CR motor
shorted?
If any coil is shorted, check
the CR motor driver circuit
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 CNI
on the B027 MAIN board
With the power off, does the
Troubleshooting
Finding Solution
Connect CN1 on
Yes
board.
Connect CN3 on
Yes
board.
Replace the
No
OPERATE switch.
Yes Replace the fuse.
Replace the B027
No
Replace the CR
motor and follow
Yes
the steps below to
check the driver.
Replace the CR
motor and B027
No
MAIN board at the
same time.