Electricaloperation; Up Operation - Ricoh FT4430 Service Manual

ELECTRICAL
D o w n K e y
Close Cover
I n d i c a t o r
Cover
Safety SW
Down
1
The bottom plate moves down only when the Down key is pressed or paper
end occurs. When the Down key is pressed, the flip-flop changes state (all
outputs change from LOW to HIGH or vice versa). Then, three things happen
simultaneously: (1) The gate circuit turns off, preventing size data from being
sent to the copier; (2) The timer circuit turns on, causing the LED in the down
key to blink; and (3) SSRI turns on, energizing the drive motor to move the
down.
tray
down sensor is actuated
The
causes the flip-flop to change back to its original state, which turns off SSR1
and resets the timer circuit. The LED in the Down key stays continuously on.

2. Up Operation

Opening and closing the upper or side LCT cover while the bottom plate is in
the down position starts the up operation. This causes the gate circuit to send
paper size data to the copier. At the same time the cover safety switch
changes the state of the flip-flop and the flip-flop energizes SSR2, which turns
on the drive motor to move the tray up. The drive motor stays on until the
paper pushes up the pick-up roller. The actuator on the pick-up roller bracket
then moves out of the upper limit sensor; this again changes
state and the motor stops.
The cover safety switch prevents operation if the cover is open
the ac 100 volt line.
OPERATION
Tray Board
when the bottom plate is fully lowered. This
9-7
16 April '88
the flip-flop's
as this opens