Parts That Operate When The Sw1 - Minolta Di850 Service Manual

OTHER KINDS OF CONTROL
[2] Parts that Operate when the SW1 (Main) is Turned ON
RL1
AC(H)
AC(C)
RL2
RL3
1. Operation
a. Power supply
When SW1 (main) is turned ON, AC power is
supplied to the DCPS1 (DC power supply unit 1).
As a result, the PSMB (power supply manage-
ment board) turns ON RL2 (AC input relay for
DCPS2), supplying AC power to DCPS2 (DC
power supply unit 2). DCPS1 supplies 5V DC, -
5V DC, and 12V DC which are used in the
machine. DCPS2 supplies 24V and 36V DC.
DCPS1 and DCPS2 supply power to the PRCB
(printer control board) and other boards used in
the machine, starting initial operations and con-
trol inside the machine.
5VDC
RL1 CONT
AC(H)
AC(C)
5VDC
DCPS1
AC(H)
AC(C)
DCPS2
5VDC
RL2 CONT
5VDC
RL3 CONT
PSMB
2-P-2
From ACDB
Fixing heater power supply
5VDC
-5VDC
12VDC
SGND
Power supplies for boards,
motors, fans, solenoids, etc.
24VDC
PGND
36VDC
IP power supply
2. Signals
a. RL1 input signal
(1) RL1 CONT (ACDB to RL1)
RL1 drive control signal.
This signal controls ON/OFF operations of L2,
L3, and L4 drive power relay.
[L]: RL1 ON
[H]: RL1 OFF
b. RL2 input signal
RL2 CONT (PSWB to RL2)
RL2 drive control signal.
This signal controls ON/OFF operations of the
relay for AC power supply to DCPS2.
[L]: RL2 ON
[H]: RL2 OFF
c. RL3 input signal
(1) RL3 CONT (PSMB to RL3)
RL3 drive control signal.
This signal controls ON/OFF operations of the
relay for AC power supply to IP.
[L]: RL3 ON
[H]: RL3 OFF