Ricoh G147 Service Manual page 155

The XSCRDY signal was detected
LOW) (Active) after the polygonal
mirror motor switched on, but the
signal was not detected LOW after 1
sec., and was not detected after
another 500 ms.
ID sensor pattern test error
One of the following ID sensor
output voltages was detected
twice consecutively when
350 D
checking the ID sensor pattern.
1. Vsp greater/equal 2.5V
2. Vsg less than/equal 2.5V
3. Vsp = 0V
4. Vsg = 0V
ID sensor Vsg measurement error
When the ID sensor was checked
351 D
twice, the ID sensor output voltage
was 5.0V while the PWM signal input
to the ID sensor was 0.
ID sensor pattern edge detection
error
352 D
The ID sensor pattern edge voltage
was not equal to 2.5 V and two
samplings within 800 ms.
ID sensor, LED current abnormal at
353 D
initialization
SM
defective.
Polygonal mirror motor or
polygonal mirror motor drive
board defective.
ID sensor defective
ID sensor harness or connector
loose, broken, defective
IOB defective
HVPS board defective
ID sensor dirty
ID sensor connector or harness
loose, broken, or defective
ID sensor defective
IOB defective
HVPS defective
ID sensor dirty
ID sensor connector or harness
loose, broken, or defective
ID sensor defective
IOB defective
HVPS defective
ID sensor dirty
ID sensor connector or harness
loose, broken, or defective
4-5 G147