Is
5 VDC present at
pin 10 of P201 on the
power supply module
when AC is
applied?
Does
a 4.3 volt on off
signal appear at pin
13 of P201 when the
on/off button is
pressed?
Yes
Suspect a problem with
the standby 5 volt supply
on the power supply supply
module.
No
Is the
ACD (AC Detect)
level less than .07V
at pin 14 of P201
when AC is
applied?
Yes
No
Suspect a problem with
the power supply module.
Does
the secondary
12 volt source appear
at pin 8 of P201 when
the on/off button is
pressed?
No
No
Suspect a problem
with the SYSCON
circuit located on the
Main module.
Yes
Yes
Suspect a
problem with the
signal circuits
located on the Main
module.
Dead Set No
Sound/ No
Picture
12
