Troubleshooting Of The Control Circuit - Sharp AH-A129E Service Manual

AH-A129E
AU-A129E
TROUBLESHOOTING OF A CONTROL CIRCUIT
The machine does not function
at all with remote controller and
switches on the indoor unit.
Using a meter, measure the
voltage between anodes of D1
and D2 on the PWB ass'y 1.
Is the measured value
approx. 20.6 Vac ?
YES
Replace the PWB with a new
one.
measure the secondary voltage
of transformer.
NO
Is the 2.5A fuse
open circuit ?
YES
Replace the fuse and varistor
with new ones.
20
NO
Replace the transformer with
a new one.