Bosch LS1-UC10U, Инструкции по установке

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LS1 Pendant Sphere Loudspeaker Troubleshooting | en 13
Bosch Security Systems B.V. Installation note 2018.06 | V.01 | F.01U.354.322
6 Troubleshooting
Problem Possible Causes Action
No Sound Amplifier Connect a known working test speaker to the amplifier outputs. If
there is no sound, check all electronics are on, the signal routing is
correct, the source is active; the volume is turned up, and so on.
Correct/Repair/Replace as necessary. If there is sound, the problem is
in the wiring.
Wiring Verify you have connected the correct wire pairs to the amplifier. Play
something at low level through the amplifier (for example, from a CD
player or tuner). Connect the test speaker in parallel with the
malfunctioning line. If the sound has gone or is very weak, the line has
a short in it (possibly a severe scrape, pinch, or staple puncture). If
the sound level is normal the wire is open (possibly a cut wire or
missed connection). Using the test speaker, move down the line and
test each connection/junction until you find the problem and correct
it. Observe proper polarity.
Verify you have the inputs and outputs connected to the correct wires.
If the subwoofer input panel is not correctly wired, there will be little
or no sound. Observe proper polarity.
Poor Low-
Frequency
Response Speakers Wired Out-
of-Polarity When two speakers are connected out of polarity (out of phase), the
low frequencies will cancel each other acoustically. Carefully observe
the wire markings or tracers on your speaker wires. Verify the
amplifier (+) terminal is connected to the desired color-coded
transformer terminals and the amplifier (-) terminal is connected to
the red speaker terminals.
Intermittent
Output such as,
Crackling or
Distortion Faulty Connection Check all connections at amplifier and speakers to ensure they are
clean and tight. If the problem persists, it may be in the amplifier or
wiring. See other actions above.
Constant Noise
such as Buzzing,
Hissing, Humming Defective Amplifier
or other Electronic
Device If the noise is present but no program material is playing, the likely
cause is the signal chain in the electronics. Evaluate each component
as necessary to isolate the problem.
Poor System
Grounding or
Ground Loop Check and correct the system grounding, as required.
If these suggestions do not solve your problem, contact your nearest dealer or distributor.
See also
– Polar diagram, page 16