Toshiba e-STUDIO4500c Service Manual page 424

SERVICE CALL CONDITIONS
SC496 C MUSIC sensor error
The MUSIC sensor detected an
abnormal pattern on the ITB
because:
SC497 C Temperature and humidity sensor error 1: PCU
The thermistor output of the
temperature and humidity
sensor above the black PCU
was not within the prescribed
range (0.5V to 4.2V)
SC498 C Temperature and humidity sensor error 2
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)
SC499 C ITB Position Sensor error
Abnormal ITB Position Sensor
output.
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
harness disconnected, loose, defective
Temperature and humidity sensor
defective
Temperature and humidity sensor
harness disconnected, loose, defective
Temperature and humidity sensor
defective
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.
4-46
April 2007