Power Supply - Canon imageFORMULA DR-G2140 Service Manual

V. POWER SUPPLY

1. Power Supply

A block diagram related the power supply
of this machine is shown below.
The power supply PCB is common use
into a 100 V system (for 100 V/120 V) and a
200 V system (for 220-240 V).
The power switch (button) mounted on
the operation PCB.
When the power cord is connected, the
AC power is supplied to the power PCB and
then generated 5 VDC for control. In this state,
the power switch is turned ON, and the FET
(Field-Effect Transistor) is turned ON, then
the control PCB starts working. And the con-
trol PCB orders that the power PCB gener-
ates 24 VDC, and it is supplied to the control
PCB.
Furthermore, the DC/DC converter gen-
erates each of the DC voltages that are sup-
plied to the components.
COPYRIGHT © CANON ELECTRONICS INC. 2018
When no documents have been fed or
there has been no communication with the
computer for a period of time to be set, the
machine enters the sleep mode. When the
machine is in the sleep mode, the electrical
circuits enter a sleeping state. However, the
CPU does not enter a sleeping state. This ma-
chine automatically returns from the sleep
mode when it receives communication from a
computer or when a key on the operation
panel is pressed or other any input.
And this machine has an auto power OFF
function. When the auto power OFF function
is set ON, the power supply automatically
turns OFF after 4 hours without a scanning or
other operation.
Figure 2-501
CANON DR-G2140/G2110/G2090 FIRST EDITION
CHAPTER 2 FUNCTION & OPERATION
2-23