Reference: Activation Conditions Of The Control Panel Backlight - Canon imageRUNNER ADVANCE C5255 Series Service Manual

Reference: Activation conditions of the Control Panel
Backlight
● Description
Following are the details of conditions when the Control Panel Backlight is activated:
● Field Remedy
The Control Panel Backlight is turned ON when 12V power is supplied from the Relay PCB.
The details on the route to supply 12V power are as follows:
• The Control Panel Backlight is turned ON when 12V power is supplied. The 12V
power is supplied through the following route:
AC Driver PCB > 12V Power Supply PCB > Relay PCB > Control Panel
• The power-on signal (which keeps the supply of 12V power) is sent through the
following route:
Main Controller 2 > Main Controller 1 > Riser PCB > DC Controller > Relay PCB
> 12V Power Supply
• The 12V Power Supply receives its power supply from the AC Driver PCB and the
power-on signal (which keeps the supply of AC power) is sent through the following
route:
Main Controller PCB2 > Main Controller PCB1 > RISER PCB > DC Controller
PCB > Relay PCB > AC driver PCB
Power-on signal
J2001
J411
Relay
PCB
AC
line
AC 12V
J411
driver Power
PCB Supply
Reference:
When the power-on signal is blocked, the power supply stops even if the Power Supply
Unit is operating properly.
The power-on signal is output at 1 to 3V.
6
Troubleshooting > Startup System Failure Diagnosis > Reference: Activation conditions of the Control Panel Backlight
J431 J122
Power-on signal
DC
Connector
Riser Main
Controller
between
PCB Controller
PCB
the PCB
J421 J104
12V Power Supply line
Control Panel
control signal
J427
Control
Panel
12V Power Supply line
6 Troubleshooting > Startup System Failure Diagnosis > Reference: Activation conditions of the Control Panel Backlight
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