Duplex Motor Circuit - Ricoh FT7770 Service Manual

30 April, '89

Duplex Motor Circuit

7.
Normally the duplex side plate stays in the home Position. When it is in
that position, CN208-B14 of the main board receives
plate moves away from the home position, CN208-B14 changes to +15 volts.
In duplex or image overlay mode, when the Start key is pressed for the
front side copy, the dc drive board outputs pulses D1 through D4 to drive
the duplex side plate motor (M-7). It de-energizes the motor when the side
plate moves to a position 10 millimeters from the selected paper size.
After the trailing edge of the last sheet passes the duplex entrance sensor,
the main board energizes M-7 again and moves the duplex side plate against
the edge of the paper stack.
When the last sheet of paper is fed out of the duplex tray, S-13 turns off
and the +9-volt pulse signal at CN203-A10 of the main board drops to 0
volts. The main board then reverses M-7 and returns the side plate to the
home position.
The direction of stepping motor rotation depends on the phase angle be-
tween the driving pulses.
2-100
-
0 volts. When the side