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HM-331 (En/T)
44
Knowledge section
In case of difficulty
Operation to reset
The microcomputer may fall into malfunction (impos-
sibility to operate, erroneous display, etc.) when the
power cord is unplugged while unit is ON or due to
an external factor. In this case, execute the following
procedure to reset the microcomputer and return it
to normal condition.
Unplug the power cord from the power outlet then,
while holding the “set/demo” key depressed, plug
the power cord again.
÷ Please note that resetting the microcomputer clears
the contents stored in and it returns to condition when
it left the factory.
What seems to be a malfunction is not always so. Before calling for service, check the following table
according to the symptom of your trouble.
RemedyCauseSymptom
Amplifier section/Speakers
÷ Connect properly referring to “
System
c
onnection”.
÷ Adjust to an required volume.
÷ Switch MUTE OFF.
÷ Unplug the headphone plug.
÷ Turn the unit OFF, remove the short-
circuit and turn the unit ON again.
÷ Insert correctly.
÷ Connect properly referring to “System
connection”.
÷ Adjust the optimum left and right bal-
ance.
Sound is not produced.
No sound from the head-
phones.
Sound is not produced from
the left or right speakers.
÷ The speaker cords are disconnected.
÷ The volume control is set to the mini-
mum position.
÷ The MUTE key of remote control unit is
switched ON.
÷ The headphone plug is inserted into the
jack.
÷ The speaker cords are short-circuited.
÷ Imperfect insertion.
÷ The speaker cords are disconnected.
÷ The BALANCE is set completely to the
left or right channel.
RemedyCauseSymptom
÷ Adjust the present time again.
÷ Adjust the present time again.
÷ Adjust the present time referring to
“Clock adjustment”.
÷ Set the timer ON time and OFF time.
÷ Press the TIMER key to set up the execu-
tion.
÷ Connect antennas.
÷ Select a band.
÷ Tune to the frequency of the desired
station.
÷ Install the outdoor antenna in an apart
position from the road.
÷ Switch the suspected electric appliance
OFF.
÷ Install the TV or the system at an in-
creased distance between them.
÷ Preset stations with tunable frequen-
cies.
÷ Preset stations again.
The clock display blinks with-
out changing the figures.
Timer operation is not pos-
sible.
Radio stations cannot be re-
ceived.
Noise interferes.
A station has been preset but
it cannot be received by press-
ing the P.CALL key.
÷ There was a power failure.
÷ The power cord was unplugged from the
outlet.
÷ The present time has not been adjusted
or there was a power failure.
÷ The timer ON time and OFF time have
not been set.
÷ The timer execution was not set up.
÷
The antennas have not been connected.
÷ A proper broadcasting band has not been
selected.
÷ The frequency of the station to be re-
ceived is not tuned.
÷ Car ignition noise.
÷ Influence of an electric appliance.
÷ A TV set is installed near the system.
÷ The frequency of the preset station is
not tunable.
÷ The preset memory has been cleared
because the power cord has been un-
plugged for a long period.
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Tuner section
2
2
set/demo