Electromagnetic Noise Enters Into Tv Sets Or Radios - Mitsubishi Electric MUZ-GA50VA Service Manual

Electromagnetic noise enters into TV sets or radios

I
Is the unit earthed?
Is the distance between the
antennas and the indoor
unit within 3m, or is the
distance between the
antennas and the outdoor
unit within 3m?
Is the distance between the
TV sets or radios and the
indoor unit within 1m, or is
the distance between the TV
sets or radios and the
outdoor unit within 3m?
Is there any antennas damage
by rust or something , coaxial
cable damage, or poor
contact such as loosing of
the connectors or wire
disconnection of wiring of the
antennas?
Is the indoor/outdoor
connecting wire of the air
conditioner and the wiring of
the antennas in close?
Even if all of the above conditions is fulfilled, the electromagnetic noise may enter, depending on
the electric field strength or the installation condition (combination of specific conditions such as
antennas or wiring).
Check the followings 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, grounding wire, antennas, wiring
from antennas, receiver
5.Electric field intensity of the broadcast station affected by the electromagnetic noise
6.Presence or absence of amplifier 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 OPERATE/STOP (ON/OFF) button
on the remote controller 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 OPERATE/STOP (ON/OFF) 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.
After checking the above, consult the service representative.
No
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Earth the unit.
Extend the distance between
the antennas and the indoor
unit, or the antennas and the
outdoor unit.
Extend the distance between
the TV sets or radios and the
indoor unit, or the TV sets or
radios and the outdoor unit.
Replace the antennas.
Replace the coaxial cable.
Extend the distance between
the indoor/outdoor connecting
wire of the air conditioner and
the wiring of the antennas.
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