Code #21 - Scanner Home Position Error - Ricoh A151 Field Service Manual

2.4 CODE #21 — SCANNER HOME POSITION ERROR
- Definition -
The scanner home position sensor's output remains LOW (de-actuated) for 9
seconds after the main switch is turned on.
- Possible Causes -
Scanner home position sensor failure
•
Defective scanner motor
•
Defective main board
•
Defective dc power supply board
•
Incorrect scanner drive wire position
•
FU202 on the dc power supply board open (blown fuse).
•
- Action -
Turn the main switch off and on.
Check the position of the 1st scanner sensor actuator.
Actuated De-actuated
Does the scanner motor rotate when the main switch is turned on?
No Yes
Correct the scanner drive wire position.
Check the voltage at CN106-2 on the main board.
24 volts 0 volts
Check FU202 on the dc power supply board.
Good
Replace the dc power supply board.
Check the voltage at CN105-1 and 6 on the main board.
24 volts 0 volts
Replace the main board.
FSM
No Good
Replace FU202
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