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2. Troubleshooting guide
2.1. No raster
Turn-on power supply, check
if the red indicator is light in
the STANDBY?
no
Check if PIN11(5V) of X401
on main board is normal?
no
Check STANDBY circuit of
power supply board
yes
Press POWER button on the
unit or sensor control and
check the indicator.
Check if the PIN13 of X401
on main board is high-level?
Check back light board
no
Check the backlight
control circuit
blue
yes
28
red
Check if the PIN1 of X401 on
main board is low-level?
yes
Check power
supply board
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