Ricoh FT4460 Service Manual page 362

3. Make copies to check whether the toner supply clutch is on or off.
(1) If toner is not supplied even though the image density is low:
Check Vsp with SP Mode No.55
If Vsp is too low, check and adjust the ID sensor bias, charge
corona current, and ID sensor grid voltage.
If Vsp is too high, check the level of CN303-A13 on the I/O control
board.
L: Replace toner supply clutch.
H: Replace I/O control board.
(2) If Vsp does not decrease even though the toner supply clutch is on:
Toner end is not detected (Color). –> Replace the toner end
detector.
Toner blocking in the toner tank –> Clean the inside of the toner
hopper.
Toner supply roller is clogged with toner. –> Clean the toner supply
roller.
12-25
28 February 1989