Konica Minolta bizhub c650 Service Manual page 213

24. Other control
24.4 Parts operated when the main power switch and sub power
switch are turned ON
24.4.1 Parts operated when the main power switch and sub power switch are
turned ON
• When the sub power switch is turned ON, MFP board detects it and sends a control sig-
nal to the DC power supply through the printer control board.
• The DC power supply then supplies 3.3 VDC, 5VDC, 12VDC, 15V DC, and 24 V DC to all
PWBs and options. It also turns ON the relays in the PWBs and power can be supplied to
the IH heater and the heater lamp.
NOTE
• To turn OFF the main power switch, turn OFF the sub power switch before and
make sure that blue lighting of the start key turns orange and then goes out.
(Check that power supply to the HDD is shut down. Turning OFF the main power
switch while the HDD is running could result in a defective HDD.)
• To turn OFF and ON the main power switch, first turn OFF the main power switch
and wait for 10 sec. or more before turning it ON again. If a setting value or values
in the tech. rep. mode are changed, it takes 10 sec. or more to incorporate the set-
ting changes properly in the machine.
• Power switch OFF/ON procedure
1. Turn OFF the sub power switch.
2. Turn OFF the main power switch.
3. Wait for 10 sec.
4. Turn ON the main power switch.
5. Turn ON the sub power switch.
178
Theory of Operation Ver. 8.0 Jun. 2008
Sub power switch
Main power switch
A00JT2E534DA