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2. Trouble in Power on
Is Power LED
on or off?
On
Check the output
voltage
of adapter.
Yes
Is the pulse
of pin 7
of
-com.
Yes
Is 5VS line
normal?
Yes
Check on U1(scalier)
Off
Refer to No video
or No raster.
No
Trouble
in the adapter.
No
Trouble in U3 & Q1
and its ambient circuit.
No
Trouble in SQ1 and
its ambient circuit.
16
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