Bosch PM1-LISD, Инструкция по установке и эксплуатации

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Problem Possible cause Possible solution
Amplifier overload is
triggered, because the
Isolator Board tap-off setting
is 100 watt, and the blocking
capacitor is less than 22 µF. – Use at least a 22 µF
capacitor for each
loudspeaker when using
the 100 watt setting.
Amplifier overload is
triggered, because the
overload setting on the
Isolator Board is more than
25% of the available amplifier
power. – Set the permissible load
to 25% or less of the
amplifier power.
No audio from a loudspeaker,
Installation option 1. – Loudspeaker connection
is faulty.
– Short jumper in ON
position.
– Loudspeaker load
exceeds maximum
permissible load setting
of the Isolator Board.
– Isolator Board is
defective.
– Loudspeaker is
defective.
– Make sure all settings
and connections are OK.
– Check with another
Isolator Board.
– Check with known good
loudspeaker.
No audio from a speaker or
branch, Installation option 2. – Loudspeaker load
exceeds maximum
permissible load setting.
– End-of-line is not sensed
by Isolator Board.
– Isolator Board is
defective.
– Loudspeaker is
defective.
– DC Blocking Board or
33 ohm resistor with DC
blocking capacitor not
installed for PRS‑4B125.
– Make sure all settings
and connections are OK.
– Check end-of-line
resistor value (47 kohm).
– Check for DC voltage at
the Isolator Board tap-off
and end of the branch:
–
< 10 V = short
circuit.
– 12 V – 16 V = OK.
– 21 V = open circuit.
– Check with another
Isolator Board.
– Check with known good
loudspeaker.
– Use a DC Blocking Board
or a 33 ohm resistor and
a decoupling capacitor in
series with the
loudspeaker.
Loudspeakers Line Isolator System Troubleshooting | en 51
Bosch Security Systems B.V. Installation and Operation Manual 2014.03 | V1.1 |