Service manual

Table 5-7. Carriage Does Not Move
Cause Step Checkpoint Finding Solution
The B034 PSB/PSE board
may be dead.
1
With power on, is there an
output of +24 VDC between
pin9(+)andpin8(–)for
CN2 on B034 PSB/PSE
board?
No
Replace the B034
PSB/PSE board.
The carriage mechanism is
defective.
2
Turn off the scanner and try
to move the carriage
manually. Does the
carriage move smoothly?
No
Check the
carriage
mechanism, and
replace or
reassemble the
affected parts.
The CR motor is defective. 3
Dissconnect CN1 on the
B034 MAIN/ MAIN-B board
anduseamultimeterto
check the coil resistance
between pins 2 and 4 and
between pins 1 and 3
(2 points total) on the
disconnected cable side.
Pin2-Pin4
Pin1-Pin3
Are the resistances for the
two points above
approximately 15 ohms?
No
Replace the CR
motor. If any coil
is shorted, follow
the steps below to
check the driver.
If any coil is shorted, check
the CR motor driver circuit
using the following
procedure:
1. Set the multimeter to
check resistance.
2. Place the (–) terminal of
the multimeter on pins 1,
2, 3, and 4 of connector
CN1 on the B034 MAIN/
MAIN-B board.
3. Place the (+) terminal on
pin 2 of connector CN4
on the B034 MAIN/
MAIN-B board (GND).
With the power off, does
the multimeter detect “∞”?
No
Replace the CR
motor and B034
MAIN/ MAIN-B
board at the same
time.
The B034 MAIN/ MAIN-B
board may be dead.
4— —
Replace the B034
MAIN/ MAIN-B
board.
GT-5000 / Action Scanner II Service Manual Troubleshooting
Rev. A 5-5