Bosch LC20-PC60G6-6E, Installation Note

Troubleshooting

Problem

Possible Causes

Action

No output

Amplifier

Ensure the amplifier channel is being fed an input signal (preferably
via a signal input indicator on the amplifier).

Verify the amplifier channel’s volume is turned up.

Connect the loudspeaker and cable, which had no output to another
amplifier channel, ensuring an input signal is fed to the new amplifier
channel. If you then get output, the problem was the amplifier
channel. If not, then the problem is either the cable or the
loudspeaker.

Loudspeaker
cables(s)

Replace the cable(s) connecting the loudspeaker system and
amplifier.

Questionable or
intermittent output,
such as crackling

Faulty connection

Ensure all cabling for proper connector contact. A bad connection can
result in intermittent contact or dramatically increased resistance,
which in turn can cause reduces output or noises unrelated to the
signal.

Improper power
tap setting

Verify the power tap setting under the loudspeaker grille is
appropriate for the installation and amplifier chosen.

Constant noise
such as buzzing,
hissing, or
humming

A faulty electronic
device in the signal
chain

Loudspeakers cannot generate these sounds by themselves; you may
have a faulty electronic device in the signal chain.

Poor system
grounding

Check and correct the system grounding, as required.

Poor low-frequency
output

Out-of-polarity
hookup between
multiple
loudspeakers

When two loudspeakers are hooked up out of polarity (out of phase),
the low frequencies cancel each other out. Try reversing the polarity
of one of the loudspeakers either by turning around a dual-banana
plug at the amplifier or by reversing the tip/sleeve leads on the jack.
Which ever condition results in greater low-frequency output is the in-
polarity condition.

If these suggestions do not solve your problem, contact your nearest dealer or distributor.

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Bosch Security Systems B.V.

Installation Note

2017.01 | 02 | F.01U.321.490