Ricoh FT7770 Service Manual page 103

- Normal Operation -
To begin the circuit
Separation power pack
put to the main board
the main switch is turned on, +24 volts
CN327-10 as the power source for the high voltage coronas.
When the Start key is pressed, the CPU supplies LOW trigger signals for S1
at CN208-B7 and T1 at CN208-A8. This action turns on the LEDs, and the
phototransistors energize the power pack.
operation, +24 volts
at CN327-9. This voltage powers the LEDs and is in-
as the triggers (Tl, T2, S1, S2). Additionally, when
2-47
input to the Transfer/
(VA) is
input to the power pack at
(VP) is
30 April, '89