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Problem: No output signal at the loudspeakers;
the LEDs above the
and
buttons flash alternately (the
PROTECTION circuit has tripped).
Cause 1:
The PROTECTION circuit has tripped due
to overheating or overloading.
Remedy:
Reduce volume and wait for about
20 seconds. If the unit does not switch on
again automatically, it has become too hot
and should be left switched off for a few
minutes to cool down.
Cause 2:
Short-circuit in the speaker leads, e. g.
stray wire ends touching at the speaker
terminals, or mechanical damage to the
cables.
Remedy:
Check speaker leads and terminals, twist
wire ends together neatly, replace
damaged cables.
Cause 3:
Overloading due to poor earth contact.
Remedy:
Disconnect input cable and wait to see if
the amplifier switches back on again; if so,
check the input lead and replace if
necessary.
Problem: Unit switches off repeatedly at fairly
high volume levels.
Cause 1:
Overheating due to heat build-up.
Remedy:
Set up the unit in such a way that an
unobstructed flow of cooling air is
guaranteed.
Cause 2:
Overheating through insufficient
loudspeaker impedance.
Remedy:
Use only loudspeakers of at least 4 Ω
impedance (DIN rating). That means a
minimum impedance of > 3.2 Ω.
Problem: Flat sound image, insufficient bass
response.
Cause:
The loudspeaker cables are connected
with reversed polarity.
Remedy:
Check the speaker connections at the
loudspeakers and at the amplifier’s
speaker terminals; correct if necessary.
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