Service Manual

OTHER CONTROLS
2-38
II UNIT EXPLANATION
2
11.2 Components Operated When the Power Switch is ON
11.2.1 Components operated when the SW1 (Main power switch) is on
In the case of the 7145
Setting the SW1 (Main power switch) to the ON position supplies AC power to the DCPS (DC power
source) which in turn supplies +12DVC, -12VDC, and +5DVC to the SCB (System control board). The
DCPS also supplies +5DVC to the OB (Operation board) through the SCB.
When the PTC (Internal heater) is provided as an option for service parts, according to the setting of the
25 mode DIP SW16-2, +24VDC is supplied to the PTC (Heater) from the DCPS (DC power source).
If options such as a printer controller (IP-432) and/or fax control board (FK-102 Type A/FL-102) are
installed, +12VDC, -12VDC and +5VDC are also supplied to these options through the SCB (System con-
trol board).
In the automatic start-up mode, the same operation is made consecutively as when the SW2 (Sub power
switch) is turned on according to the discretion of the SCB (System control board).
7322ma2009
SW1
DCPS
SCB
PTC
(OPTION)
OB
IP-432
(OPTION)
+12VDC
-12VDC
+5VDC
+24VDC
+12VDC
-12VDC
PSW2B
SW2
+5VDC
SGND
+5VDC
+12VDC
-12VDC
+5VDC
+12VDC
-12VDC
+5VDC
SUB_SW
FK-102/FL-102
(OPTION)