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Problem: Amplifier does not turn on. Neither the red nor blue
indicator lights are on.
1. Make sure that the amplifier is plugged in, and verify that
there is the proper voltage at the wall outlet.
Problem: The red indicator lights, but the blue indicators do
not light up when the power switch is depressed.
1. If the amplifier is being used in a Synthesis system, make
sure that the surround processor is turned on, the Auto
On/Manual On switch is in the Auto On position, and that
all of the necessary DIN cables are connected between the
various system components. Refer to the "CONNECTING
YOUR SYNTHESIS SYSTEM" section for reference.
2. If the amplifier is not being used with a Synthesis system,
make sure that the Auto On/Manual On switch is in the
Manual On position.
Problem: There is no sound from the speakers, but the
amplifier is on (blue indicators lit).
1. Make sure that the surround processor or equalizer is on,
and that the correct source has been connected and selected.
2. Make sure that the correct outputs are connected from the
surround processor or equalizer to the amplifier.
3. Make sure that the speakers are connected to the correct
terminals. Check for short circuits at both ends of the
speaker cables.
Problem: Not all of the amplifiers turn on in a Synthesis system.
1. Make sure that all required DIN cables are connected
between system components. Refer to the "CONNECTING
YOUR SYNTHESIS SYSTEM" section.
2. Make sure that each amplifier has its Auto On/Manual On
switch in the Auto On position.
Problem: Insufficient audio from the speakers.
Check that the output levels of the surround processor or
equalizer are set properly.
Problem: Insufficient bass.
Verify that the speakers have been wired to the amplifier with
the correct polarity.
Problem: Speakers do not switch from music to cinema mode.
1. Make sure that the screw terminal and DIN adapter cables to
speakers are correctly wired and are connected to the correct
jacks on the S650A or S7150.
2. Make sure that all required DIN cables are connected
between system components.
Problem: Audible hum from the speakers.
1. Check the power outlets and make sure that there is a solid
earth ground present. (The services of an electrician may be
required.)
2. Make sure that all signal cables are routed away from power
cords.
3. If these suggestions fail, experiment by running ground
wires between the rear panel screws of the amplifiers and the
other system components, such as the surround processor
or signal processing package.
If you still encounter difficulty after trying the above suggestions,
call your JBL Authorized Dealer or JBL at (800) 336-4JBL for
further assistance.
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TROUBLESHOOTING