Troubleshooting

PROBLEM

CONDITION

CAUSE

		• Amplifier not plugged in.
	Power Indicator LED is off.	• AC outlet dead.
	Power Indicator LED is off.	• Power switch off.
		• Power switch off.
		• Circuit breaker tripped.

	Power Indicator LED is red.	• No signal from source.
	Input Signal / Clip LED is off.	• Module not installed correctly.
NO SOUND
NO SOUND	Power Indicator LED is red.	• Master or input channel volume control turned down.
	Power Indicator LED is red.
	Input Signal / Clip LED is green.
	Input Signal / Clip LED is green.	• Rear panel master mute terminal shorted.
	LED Output Meter is off.	• Rear panel master mute terminal shorted.
	LED Output Meter is off.

	Power Indicator LED is red.	• Speaker connections on amplifier are incorrect.
	Power Indicator LED is red.	• Trans / Direct Out selector not set correctly.
	Input Signal / Clip LED is green.	• Trans / Direct Out selector not set correctly.
	Input Signal / Clip LED is green.	• Poor / broken speaker wiring.
	LED Output Meter is operating.	• Poor / broken speaker wiring.
	LED Output Meter is operating.	• Defective speakers.
		• Defective speakers.
	Power Indicator LED is red.
	Input Signal / Clip LED is green.	• Partial short on the output.
	Volume Controls are turned up and	• Partial short on the output.
	shows little activity.
	Unit is extremely hot.

	Power Indicator LED is red.	• Signal from source is already distorted.
	Power Indicator LED is red.	• Poor speaker connections.
	Input Signal / Clip LED is green.	• Poor speaker connections.
	Input Signal / Clip LED is green.	• Trans-Out load on wrong tap.
DISTORTED	LED Output Meter is not in red.	• Trans-Out load on wrong tap.
DISTORTED	LED Output Meter is not in red.	• Bass control boosted too much.
SOUND		• Bass control boosted too much.
SOUND

	Power Indicator LED is red.	• Input signal level to module too high (should cause red
	Power Indicator LED is red.	clip LED).
	Input Signal / Clip LED is red.	clip LED).
	Input Signal / Clip LED is red.	• Input module gain too high (if available).
	LED Output Meter is not in red.	• Input module gain too high (if available).
	LED Output Meter is not in red.	• Input module being overdriven by a high input signal.
		• Input module being overdriven by a high input signal.

	Power Indicator LED is red.	• Input volume controls set too high.
	Input Signal / Clip LED is green.	• Input volume controls set too high.
	Input Signal / Clip LED is green.	• Input master volume control set too high.
	LED Output Meter in red.	• Input master volume control set too high.
	LED Output Meter in red.

		• Lo-cut switch is set to ON.
POOR	Power Indicator LED is red.	• Speakers wired out of phase.
LOW FREQ.	Power Indicator LED is red.	• Check module bass control setting (if available).
LOW FREQ.	Input / Signal Clip LED is green.	• Check module bass control setting (if available).
RESPONSE	Input / Signal Clip LED is green.	• Check bass control setting
RESPONSE	LED Output Meter not in red.	• Check bass control setting
(NO BASS)	LED Output Meter not in red.	• Note: Transformer-coupled speakers have less bass
(NO BASS)		• Note: Transformer-coupled speakers have less bass
		response.

		• Poor electrical connections at input.
		• Input cable routed near AC cables, power transformer, or
		other EMI radiating devices.
	Power Indicator LED is red.	• Electrically noisy devices operating on the same AC
NOISE/HUM	Volume controls are in normal,	circuit.
	operational position.	• Poor equipment grounding.
		- Ensure that all AC safety grounds are connected.
		- Make sure that all components in audio chain are tied to
		the same ground.

		12

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