Ricoh IS450S Service Manual page 93

TROUBLESHOOTING PROCEDURES
Home Position Error
Symptom:
This error is detected when the home position sensor cannot detect the first
scanner.
Possible Causes:
• Defective scanner motor
• Damaged cable between the scanner motor and the IOB
• Defective IOB
• Defective home position sensor
• Damaged cable between the home position sensor and the IOB
Procedure:
Does the home position sensor work? Check it with sensor test mode. (See See
Service Level Functions – Dip Switch Settings.)
Yes No
Does 5 volts reach the sensor?
Yes
Replace the sensor.
Is the drive wire OK?
Yes No
Replace it.
Does 24 volts reach the scanner motor?
Yes No
Is the cable between the motor and the IOB damaged?
Yes
Replace the cable.
Replace the scanner motor.
No
Is the cable between the home position sensor
and the IOB OK?
Yes No
Replace the cable.
Replace the PSU.
No
Replace the IOB.
6-12
22 December 1998