GTH400-20107 06/03/98 15:50 Side 22
Power light is on, but no sound is heard from some or all of the speakers
Alternator whine through the audio system with the engine running
Bass output from speakers too low
•Defective head unit or signal processor; check each component for proper wiring and operation.
•Defective GTH400; If there is audio signal present at the inputs of the amplifier and there is no output, the GTH400 may be defective.
•Ground loops; follow the wiring suggestions in the section called “Solving Noise Problems.” Also, verify that the chassis grounding point you have chosen is true ground by checking for continuity between the chassis ground point and battery ground.
•Speaker wired out of phase; check for proper polarity on all speaker wiring (+ amp terminal to + speaker terminal and – amp terminal to – speaker terminal).
Amplifier Power Light is on and sound is heard from the front and rear channels but the Imaging is not improved with the image enhancer on
Power light is blinking and no sound is heard
•Verify that the remote control is not set in “BYPASS” mode by checking to see that the “ON” LED is lit.
•Using the system configuration diagram, confirm that the audio connections are correct for signal path and polarity. Note that right hand drive car installations must have the Left and Right input and output connections reversed as shown in the wiring section on page 19.
•Perform the adjustments as directed in the Imaging Enhancer Setup section.
•Incorrectly connected or shorted speaker wires; check for shorts in wiring.
•Defective GTH400; if there is no short on the speaker outputs, the GTH400 may be broken. Consult your JBL dealer.
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