Ricoh FT5580 Service Manual page 179

Code #28: Lens Home Position Not On
Definition:
Lights if the lens is moving towards enlargement, and the H.P. sensor
stays at a LOW signal level for longer than 3.82 seconds.
Observations:
1) The lens always moves toward enlargement at power-up, and when in
the ready condition the reproduction ratio is changed.
2) The lens is to the right of the H.P. sensor and the lens motor does
not turn on.
Points to Check:
Check if the lens is moving properly.
CN305-9 on the optics board. Otherwise, check the lens drive section,
optics board and lens drive motor.
Check if the H.P. sensor is shorted.
Code #29: Lens Home Position Not Off
Definition:
Lights if the lens H.P. sensor stays at a high signal level longer than 3.82
seconds when the lens is moving towards reduction.
Observations:
1 ) T h e l e n s a l w a y s m o v e s t o w a r d r e d u c t i o n a t p o w e r - u p a n d i n t h e
ready condition, reproduction ratio is changed.
2) The lens is to the left of the H.P. sensor and the lens motor does not
turn on.
Points to Check:
Confirm that the lens is moving properly.
If it is moving properly, check CN305-9 on the optics board. If it is not
moving properly, check the lens drive section, optics board and lens drive
motor.
Check if the H.P. sensor circuit is open.
If it is moving properly, check
10-3
12 June 1987