Mitsubishi Electric MUFZ-KJ-NAHZ Series, Service Manual

Page: 34 / 42

34
E Electromagnetic noise enters into TV sets or radios
Yes
Is the unit grounded?
No
Ground the unit.
Yes
Is the distance between the antennas
and the indoor unit within 9.91 ft. (3m),
or is the distance between the antennas
and the outdoor unit within 9.91 ft. (3m)?
No
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Is the distance between the TV sets or ra-
dios and the indoor unit within 3.28 ft. (1m),
or is the distance between the TV sets or
radios and the outdoor unit within
9.91 ft. (3m)?
Yes
Extend the distance between the TV sets and/
or radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the anten-
na wiring?
Yes
No
No
Replace or repair the antenna.
Replace or repair the coaxial cable.
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wir-
ing of the antennas.
No
Even if all of the above conditions are ful ¿ lled, the electromagnetic noise may enter, depending on the electric ¿ eld strength
or the installation condition (combination of speci ¿ c conditions such as antennas or wiring).
Check the following before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, ground wire, antennas, wiring from antennas, receiver
5. Electric
¿ eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of ampli ¿ er such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press STOP/OPERATE (OFF/ON) button on the remote control-
ler for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the
electromagnetic noise.
4) Press STOP/OPERATE (OFF/ON) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
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