Indicator Board - Ricoh M5 Service Manual

4. Indicator Board

This copier uses only LEDs for display
CPU.
To
light any particular LED, the CPU drops the appropriate control line to O volt at the same time that
the LED's scan line is being energized.
CN-NO.
J-2
Clock Pulse
J-1
Display Signal
Clock Pulse J-1 1
J-3
Display Signal
Clock Pulse J -6
J-l ,J-9
Oispaly Signal
J-8
Clock Pulse
: ; ; : ; : ;
Display Signal
J . ~ '
1
J-1
I
J - 9
1
J - 5
I
1
J-7
[
1
J - 4 \
L
/
E
elements.
This operation is illustrated below.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . ,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . " . . , ' . " , ' . . . ! . . . , . , . . . . . . . . . .
,
—.
I
The LEDs are energized by clock pulses from the
T i m e
3 - 7 8
— . —
May, 25, 1985
- )
—
Display
-
I
u
o
o
+
1
(10s)
~ i
o _
( 1 s )
Copy Counter
, 2 & / p ; &
4 ) & m ' u c l
d 2 d l
(10s)
(1s)