Troubleshooting - Bosch LB6-100S-D Installation Manual

Compact Sound Speaker System
6

Troubleshooting

Problem Possible Causes
No Sound Amplifier
Wiring
Poor Low- Speakers Wired Out-
Frequency of-Polarity
Response
Improperly Wired
Subwoofer Panel
Intermittent Faulty Connection
Output such as,
Crackling or
Distortion
Constant Noise Defective Amplifier
such as Buzzing, or other Electronic
Hissing, Humming Device
Poor System
Grounding or
Ground Loop
If these suggestions do not solve your problem, contact your nearest dealer or distributor.
Bosch Security Systems B.V.
Action
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.
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.
When two (2) 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 red speaker terminals and
the amplifier (-) terminal is connected to the black speaker terminals.
Using a test speaker as described above, verify all amplifier and
speaker wires are connected to their proper terminals with the correct
polarity. Reversing just one (1) set of amplifier wires can cut out all
bass output from the subwoofer.
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.
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.
Check and correct the system grounding, as required.
Installation Manual
Troubleshooting | en 31
2015.12 | 07 |