Read Sharp AE-M18 (serv.man2) Service Manual online
21
AY-M09AE
AE-M18AE
AE-M18AE
TROUBLESHOOTING GUIDE OF CONTROL CIRCUIT
Note : Do not check two indoor units at the same time. Be sure to check them one by one.
Measure the secondary
voltage of transformer.
voltage of transformer.
YES
NO
YES
YES
NO
NO
The machine does not function
at all with remote control and
switches on the indoor unit.
at all with remote control and
switches on the indoor unit.
None of three LEDs is ON.
Using a tester, measure the
voltage between terminal " 1 "
and " 2 " of connector CN2 on
P.W.B. ass'y.
voltage between terminal " 1 "
and " 2 " of connector CN2 on
P.W.B. ass'y.
Is the measured value
approx. 16.0 Vac ?
Is the unit to unit cord
correctly connected ?
YES
Power supply
between "L" and "N" of
terminal board ?
Replace the indoor P.W.B. ass'y
with a new one.
with a new one.
Is the 3A fuse down ?
Replace the fuse and
varistor with new ones.
varistor with new ones.
Using a tester measure the
voltage between "L" and "N"
of terminal board on the
outdoor unit.
voltage between "L" and "N"
of terminal board on the
outdoor unit.
Connect the unit to
unit cord correctly.
unit cord correctly.
Replace the transformer
with a new one.
with a new one.
Check the electric circuit on
the outdoor unit.
the outdoor unit.
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