Canon ImageCLASS MF4690 Service Manual - page 99

Chapter 9

9-1

9.1 Control Panel

9.1.1 Outline

0016-1862

The machine's control panel consists of the following PCBs, and is controlled by the SCNT board.

F-9-1

9.2 Power Supply

9.2.1 Protection Function

9.2.1.1 Protecting Function

0016-1863

In the case of troubles with power supply PCB such as short circuit to loads, and resulted in occurring overcurrent or over overvoltage, there is a protecting function

for overcurrent/overvoltage to automatically shut the output voltage to avoid fault of power supply PCB.

In the case that the protecting function for overcurrent/overvoltage is activated, it recovers by turning off the main power switch to handle the load trouble, and

then, turning on the main switch again. Also, there are 2 pc of fuses in PCB. If there is overcurrent in AC line, fuse is blown out and power distribution is shutdown.

ASIC

LED

LCD

Key SW

SCNT board

Operation panel