Counter Clrcuits - Ricoh FT2260 Service Manual

COUNTER CIRCUITS
11.7
Main Board [PCB 4]
Total Counter:
The total counter is powered by +24 volts from CN706-7 of the optics board.
The main CPU energizes the total counter by dropping CN107-8 to LOW.
The total counter is energized when the Start key is pressed.
Key Counter:
The key counter is powered by +24 volts from CN105-9 of the main board.
The main CPU monitors for the presence of a key counter at CN105-1. When
a key counter is installed, CN105-1 is LOW; however, a + 5 volt pulse signal
appears at CN105-1 if the key counter is removed.
The main CPU energizes the key counter by dropping CN105-2 to LOW.
Optics Board [PCB 2]
2-73
1 August 1988