Ricoh FT4480 Field Service Manual page 227

15 March 1987
28 LENS HOME POSITION SENSOR NOT ON
- Possible Causes -
• Lens does not move properly.
• Lens home position sensor failure
- Action -
Does the lens move smoothly?
Y N
I
Check/repair the lens drive mechanism.
Test the lens home position sensor. (Does CN101-B1 stay LOW?) Replace it if
defective.
If the above does not work, replace the main board.
29 LENS HOME POSITION SENSOR NOT OFF
- Possible Causes -
• Lens does not move properly.
• Lens home position sensor failure
- Action -
Does the lens move smoothly?
Y N
I
Check/repair the lens drive mechanism.
Test the lens home position sensor. (Does CN101-B1 stay HIGH?) Replace it
if defective.
If the above does not work, replace the main board.
9-22