Sharp AH-AP18DR Service Manual page 28

AH/AY-AP18DR
AH/AY-AP24DR
The machine does not function
with remote controller
Push button "O/I" on the
wireless remote controller.
Is transmitting
indicator of the remote
controller active ?
YES
Does beep sound
from the indoor unit ?
NO
Using a tester,
measure the voltage
between terminals
of resistor R26
on the PWB ass'y.
Push the button "O/I".
When the signal is
received, does the voltage
change ?
YES
Replace the PWB with a new
one.
NO
Are batteries of the
wireless remote controller
proper ?
Replace the wireless
remote controller.
YES
Is indicator lamp of
indoor unit proper ?
Replace the
PWB with a
new one.
NO
Replace the photo
detector unit with a new
one.
28
NO
Replace the batteries
YES
with new ones.
YES
PWB is normal.
Inspect the outdoor unit.
NO