Oki B 2400 - Manual (Page 34)

2-16 Service Manual
24xx
Carrier Service Check
Note: The Carrier Service Check includes the carrier drive, home
position sensor and ribbon feed.
FRU Action
1 Carrier Verify the carrier motor connector is connected
to the logic board at CN2. If the carrier motor
connector is connected properly, check the
carrier belt and the ribbon cartridge for wear or
damage. Check the belt and pulley
engagement.
Manually move the carrier the full length of the
carriage to check for binds and to be sure the
ribbon advances when the carriage moves in
either direction.
If the carrier binds check the following:
• Correct printhead-to-platen gap. Go to
“Printhead-to-Platen Gap Adjustment”
on page 4-2
.
• Clean and lubricated carrier shaft.
• Idler pulley not binding.
• Ribbon drive rack gear teeth not damaged.
If the carrier still binds:
Remove the belt and move the carrier again.
• If the bind is gone, replace the carrier motor.
If the bind remains, replace the carrier.
After replacing the logic board or any parts
affecting the carrier, perform the bidirectional
print adjustment. See
“Bidirectional Print
Adjustment” on page 4-4 .
2 Home Position
Sensor If the carrier moves manually without binding,
but the home position error still occurs, verify
that the logic board is receiving +40 V dc on
pin CN12-1. Check that the 5 V dc home
position sensor signal is reaching the logic
board.
Replace the sensor, or the short flexible cable
as necessary.