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Part 5: Maintenance
4.Home Position
Error
<Corrective Action>
Visual check of carriage
drive mechanism
Correct ?
Yes
Carriage motor
operation check
Correct ?
Yes
Home position
sensor check
Correct ?
Yes
Replace
the logic board.
<Cause>
The home position cannot be detected.
<Suspected Parts>
Check for any paper jams, carriage belt wear/deterioration/
dislocation, deformation of the carriage or carriage guide frame,
scratching or bending in the carriage shaft, deterioration/damage
of idler pulley, etc.
Move the carriage with your hands and check to see if it moves
smoothly. (See "4.2.3 Unlocking the Carriage for how to unlock the carria
Check that there is no abnormal noise.
No
Repair/replace
a faulty part(s).
Does it turn during initialization?
Is it out of synchronization?
No
Carriage motor check
Correct ?
Yes
Replace
the logic board.
Measuring
Pin No.
points
J6
30
While the power is on, manually move the carriage and check
to see if it is sensed at the home position.
No
Replace
the carriage unit
The MPU and printer controller are faulty.
5-18
Home position sensor, carriage motor,
logic board, carriage ribbon cable,
carriage belt, carriage shaft, idler pulley
Measuring
Pin No.
points
1-2
J2
3-4
No
Replace
the carriage motor.
Sensor
Normal reading
Open
Low level
Closed
High level (Home position sensed)
The home position sensor is faulty
The carriage ribbon cable is broken.
BJC-5000
Normal reading
Approximately10.5
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