Turn on an AM radio, bring
the remote control switch within
15 cm of the radio, and press
the ON/OFF button.
Check the indoor unit signal
receiving P. W. B.
If it is good, check the main P. W. B.
You can check the remote control switch by
other methods as explained below.
Using the test card
The sensible area should flash in orange when you
operate the remote control unit if it is good.
Ultra redray test card
Sensible area
Within 2 cm
Check functions again.
If it does not work, replace
the remote controller.
“Buzz”
Within 15 cm
[AM radio]
Check the LED (D1) with
a multimeter.
Replace the battery.
Install the battery in the correct polarity.
Yes
Yes
No
No
No
Yes
Does the radio buzz noisily?
Is battery polarity correct?
Is the battery check sign + –
flashing?
CHECKING THE REMOTE CONTROLLER
Is AC220-230V being gener
ated at
terminals
A
and B?
Are the connections for terminals C and D correct?
Is 5V being gener
ated between
Pin 6 (0V) and Pin
10
(5V) at CN
Is the 15A
fuse normal?
[No operation or abnormal operation]
Be sure to turn the power of
f
before correcting the connecti
on.
mainly
, varistor (VS2), 3A
fuse,
smoothing capacitors, IPM
, etc.
The SW power supply
s overcurrent protection is
activated, disabling the microcomputer
.
Correct properly
.
If the 15A
fuse has blown,
be aware that other parts may also be defective.
Replace defective parts.
Is the power circuit normal?
See the description on power
circuit for details
.
Is the switching power circuit OK? Has the 3A
fuse blown?
Check to see if C and D cables are connected correctly
.
If reversed or incompletely inserted, correct the cable connection.
Replace any defective parts.
If the 3A
fuse has blown, the varistor 2, etc.
may also be defective.
With the piping and lines (A, B, C, D) c
onnected, operate
the unit in the forced cooling mode using the outdoor unit service switch.
How did the self-diagnosis lamp (LD301) blink?
See the self-diagnosis lamp mode.
Ye
s
Ye
s
Power is OK
Ye
s
Ye
s
Ye
s
No
No
No
No
NG
(Fuse blown)
18 (test pin)?
- 82 -
