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ENWW Other kinds of control 117
MFP unit explanation
Parts that operate when SW1 (main power)/SW2 (secondary power) is on
1 Operation
a Operation performed when SW1 (main
power) is on
When SW1 (main power) is turned on,
AC power is supplied to DCPS (DC
power supply unit). As a result, DCPS
supplies 5 VDC and 12 VDC to the
status management and control circuit
on ICB (image control board), HD-105,
and Q3639A. ICB supplies 5 VDC to
OB1 (operation board/1).
b Operation performed when SW2 (sub
power) is on
If SW2 (sub power) is turned on when
SW1 (main power) is already on, DCPS
supplies 24 DVC for driving various
loads. Thus, all boards are energized
and initialization of this machine starts.
2 Signals
a Output signals
1 REM/2, /3 (ICB to DCPS)
The DC voltage output from DCPS
(DC power supply unit) is controlled
according to the combination of levels
of two signals.
2 AC_OFF (IN) (ICB to DCPS)
RL1 (main relay) control signal
[L]: RL1 on
[H]: RL1 off
REM/2 REM/3 Output
HH5V1,12V1
L H 5V1,12V1,5V2,12V2,
24V1,-5V1
L L 5V1,12V1,5V2,12V2,
24V1,-5V1,24V2