SERVICE CALL CONDITIONS April 2007 4-46
MUSIC sensor error SC496 C
The MUSIC sensor detected an
abnormal pattern on the ITB
because:
• A/D converter exceeded
upper or lower limit.
• The pattern used to calculate
the amount of skew is
abnormal.
• The reading of the pattern
exceeded the length of time
the LED projected light.
• LED light could not be
adjusted correctly.
• MUSIC sensor defective or disconnected
• MUSIC pattern abnormal; do a forced
process control (SP3821) and check the
result (section 4.2.4).
Temperature and humidity sensor error 1: PCU SC497 C
The thermistor output of the
temperature and humidity
sensor above the black PCU
was not within the prescribed
range (0.5V to 4.2V)
• Temperature and humidity sensor
harness disconnected, loose, defective
• Temperature and humidity sensor
defective
Temperature and humidity sensor error 2 SC498 C
The thermistor output of the
temperature and humidity
sensor at below the waste toner
bottle was not within the
prescribed range (0.5V to 4.2V)
• Temperature and humidity sensor
harness disconnected, loose, defective
• Temperature and humidity sensor
defective
ITB Position Sensor error SC499 C
Abnormal ITB Position Sensor
output. • ITB Position Sensor 1 or 2 is dirty.
• ITB Position Sensor 1 or 2 is defective.
• ITB encoder strip is dirty,
• ITB encoder strip is damaged.
• ITB movement error (e.g. the belt cannot
rotate correctly due to friction).
1. Connectors for ITB Position Sensor 1
or 2 are not connected correctly.