Canon imageCLASS MF4100 Series, Service Manual

Page: 93 / 140

Chapter 9
9-1
9.1 Control Panel
9.1.1 Outline
0014-7764
i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /
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
0014-5757
i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /
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