Parts That Operate When Sw1 (Main Power)/Sw2 (Sub Power) Is - Minolta Di551 Service Manual

OTHER KINDS OF CONTROL
[2] Parts that Operate when SW1 (Main Power)/SW2 (Sub 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 cir-
cuit on ICB (image control board), HD-105, and
IP-511. 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 com-
bination of levels of two signals.
REM/2 REM/3
5 V1, 12 V1
H H
5 V1, 12 V1, 5 V2, 12 V2,
L H
24 V1, -5 V1
5 V1, 12 V1, 5 V2, 12 V2,
L L
24 V1, -5 V1, 24 V2
SW1
AC(L)
RL1
DCPS
AC(N)
SW2
AC OFF(IN)
OB1 ICB
Output
2-P-2
5VDC
-5VDC
12VDC
5V1
12V1
REM/2
REM/3
5VDC
IP-511
12VDC
-12VDC
5VDC
12VDC HD-105
-12VDC
(2) AC_OFF (IN) (ICB to DCPS)
RL1 (main relay) control signal
[L]: RL1 ON
[H]: RL1 OFF