Chapter 4. Troubleshooting; Troubleshooting Guide Of Control Circuit - Sharp AY-AP7FHR Service Manual

AYAP7FHR
CHAPTER 4.
TROUBLESHOOTING

[1] TROUBLESHOOTING GUIDE OF CONTROL CIRCUIT

The machine does not function
at all with remote controller and
switches on the indoor unit.
Using a tester, measure the
voltage between anodes of D1
and D2 on PWB ass'y.
Is the measured value
approx. 17.0 Vac ?
YES
Replace the PWB with a new
one.
The machine does not function
with remote controller
Push button "OI" on the wireless
remote controller.
Is transmitting
indicator of the remote
controller active ?
Does beep sound
from the indoor unit ?
Using a tester,
measure the voltage
between terminals
of resistor R8
on the PWB ass'y.
Push the button "OI".
measure the secondary voltage
of transformer.
NO
Is the FUSE1 fuse down ?
YES
Replace the fuse and varistor
with new ones.
Are batteries of the
NO
wireless remote controller
YES
Replace the wireless
remote controller.
YES
NO
received, does the voltage
Replace the PWB with a new
one.
Service Manual
NO
Replace the transformer with
a new one.
NO
proper ?
YES
YES
Is indicator lamp of
indoor unit proper ?
NO
Replace the
PWB with a
new one.
When the signal is
NO
change ?
YES
4 – 1
AYAP7FHR
Replace the batteries
with new ones.
PWB is normal.
Inspect the outdoor unit.
Replace the photo
detector unit with a new
one.