JBL GTS300, GTS600 manual In Case of Difficulty

8. In Case of Difficulty

Power-on light does not come on

Power light is on, but no sound is heard from some or all of the speakers

•Head unit not on; turn the head unit on.

•Ground wire is disconnected or defective; check for continuity with an ohm-meter between the amplifier’s ground terminal and a know chassis ground point.

•Battery wire is disconnected or defective; check approximately +12 volts between the amplifier’s battery and ground terminals.

•Blow fuse; check amplifier’s located on the endpanel near the power connector. If it is blown replace it with an identical one. If the new fuse blows immediately, then check all the wiring connection. If no fault is found, consult your JBL dealer.

•Remote-on wire between the head unit and the amplifier is disconnected or defective; check for +12 volts between amplifier’s remote-on input terminal and the ground input terminal with the head unit on.

•Incorrect switch settings; make sure that all switchs (input mode and crossover) are in their correct positions for your system configuration.

•Incorrectly connected or shorted speaker wires; check for shorts in wiring.

•Defective or disconnected audio cables; check for continuity and replace if necessary.

•Incorrect Gain Adjustment; verify that the amplifier gain controls are not turned completely down. If they are, sound output level may be very low and may give the impression that the system) or part of the system) is dead.

•Defective head unit or signal processor; check each component for proper wiring and operation.

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