Make copies with a test chart and monitor the VSP value and the toner
supply clutch function.
Is the toner supply clutch controlled properly? (See the note at the bottom of
the page.)
Yes No
Is the voltage at CN117-2 always 24V ?
Yes No
Replace the toner supply clutch.
Replace the main control board.
Is the drum charge voltage correction value for the VSP pattern SP2-003 set to
the factory setting on the data sheet inside the front cover?
Yes No
If the CB high voltage supply board is the original one, store the
factory setting in SP2-003. If it is not, then store 16 in SP2-003.
Is the copier in fixed supply mode?
No Yes
Change the setting of SP2-208-001 to "3".
Reduce the value of the development bias correction for making VSP patterns
(SP2-203) to make the VSP pattern darker.
Note: The toner supply clutch should turn on for about a second or a second
and a half at intervals that depend on the condition of the developer. The
toner supply clutch should not remain on for long periods, switch on/off
erratically, or stay on permanently.
FSM 6-17 FT5535/4527/4522
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