Service manual

OTHER KINDS OF CONTROL
2-P-8
2 UNIT EXPLANATION
[5] Counter Control
This machine has the following counters:
C (T): Total counter
C (K): Key counter
These counters are controlled by the PRCB (printer
control board).
The related signal is PS61 (paper exit).
1. Operation
This machine counts copies using a software
counter.
(1) Paper ejection counter
The count increases by 1 each time PS61 which
has been ON is turned OFF (two counts in the
dual-sided copy mode).
<Operation of each counter>
a. Copy quantity display counter on OB
Displays the count of ejected papers.
b. C (K)
This counter counts in sync. with the paper exit
counter.
c. C (T)
This counter counts in sync. with the paper exit
counter.
2. Signals
a. Input signals
(1) PS61 (PS61 to PRCB)
Signal indicating passage of paper in the paper
exit section.
[L]: PS61 is turned ON to indicate that paper has
been ejected.
(2) C (K) 24V 1F (ACDB to PRCB)
Signal indicating the state of 24 V power supply
to C (K).
[L]: 24V power is not supplied.
b. Output signals
(1) C (T) CONT (PRCB to ACDB to C (T))
C (T) drive control signal.
[L]: C (T) ON
(2) C (K) CONT (PRCB to ACDB to C (K))
C (K) drive control signal.
[L]: C (K) ON
(3) C (K) SIG (PRCB to ACDB)
Key counter signal.
[L]: Signal exists
c. ACDB output signal
(1) C (K) (ACDB to C (K))
Key counter signal.
[L]: Signal exists
PRCB
ACDB
C(T)
C(K)
PS61
5VDC
PS61
SGND
C(T) CONT
C(K) CONT
C(K) SIG
C(K) 24V1F
24VDC
C(T) CONT
24VDC
C(K)
SGND
C(K) CONT
PGND
24VDC
PGND
DCPS2
ICB IFB
OB1
OB2
5VDC
SGND
DCPS1
ICB
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