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Troubleshooting > Startup System Failure Diagnosis > Reference: Activation conditions of the Control Panel Backlight
Troubleshooting > Startup System Failure Diagnosis > Reference: Activation conditions of the Control Panel Backlight
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
12V
Power
Supply
DC
Controller
PCB
Main
Controller
Riser
PCB
AC
line
Power-on signal
Power-on signal
J2001
J411
J411
J421 J104
Control
Panel
Control Panel
control signal
AC
driver
PCB
Relay
PCB
12V Power Supply line
12V Power Supply line
J427
J122 J431
Connector
between
the PCB
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.
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