Ricoh Robin Service Manual page 251

24 June 1994
2.6 CODE #28 — LENS HOME POSITION ERROR (A152
COPIER ONLY)
- Definition -
The lens home position sensor's output remains LOW (de-actuated) for 6.0
seconds after the lens moves to the home position.
- Possible Causes -
Lens home position sensor failure
•
Defective lens drive motor
•
Defective Main board
•
Defective lens drive mechanism
•
- Action -
Turn the main switch off and on.
Check the sensor actuator position on the lens assembly.
Actuated De-actuated
Does the lens motor rotate when the main switch is turned on?
No Yes
Check the lens drive mechanism and repair or replace the
defective parts.
Check the voltage at CN103-1 and 6 on the main board.
24 volts 0 volts
Replace the main board.
Check the voltage at CN103-2 to 5 on the main board when the main
switch is turned on.
17 volts 24 volts
Replace the main board.
Replace the lens motor.
SERVICE CALL CONDITIONS
6-33