– 88 –
Diagnosis/Process
fl
owchart
Item
Contents
Summary
NG
OK
B
A
Replace control
board assembly.
Replace
control board.
Replace
compressor.
Check
compressor
winding
resistance.
Check
Check winding resistance
between phases of
compressor, and resistance
between outdoor frames by
using a tester.
Is not grounded.
•
→
OK if 10M
Ω
or more
Is not short-circuited
between windings.
•
→
OK if 0.51
Ω
→
0.57
Ω
(Check by a digital tester.)
Winding is not opened.
•
Operation
Remove connector CN300 of
the outdoor fan motor, turn on
the power supply breaker, and
perform the operation.
(Stops though activation is
prompted.)
Check operation within 2
minutes 20 seconds after
activation stopped.
11-10. Inspection of the Main Parts
11-10-1. Inspection of the P.C. Board (Indoor Unit)
(1) Operating precautions
1) When removing the front panel or the P.C. board, be sure to shut off the power supply breaker.
2) When removing the P.C. board, hold the edge of the P.C. board and do not apply force to the parts.
3) When connecting or disconnecting the connectors on the P.C. board, hold the whole housing. Do not
pull at the lead wire.
(2) Inspection procedures
1) When a P.C. board is judged to be defective, check for disconnection, burning, or discoloration of the
copper foil pattern or this P.C. board.
2) The P.C. board consists of the following 2 parts
a. Main P.C. board part :
DC power supply circuit (5V, 12V, 35V), Indoor fan motor control circuit, CPU and peripheral
circuits, buzzer, and Driving circuit of louver.
b. Indication unit of infrared ray receiving infrared ray receiving circuit, LED :
To check defect of the P.C. board, follow the procedure described below.
CAUTION
