Power Amplifier Reference 7540a/7541a
TROUBLESHOOTING
Y PROBLEM:Y PROBLEM:
No audio (POWER LED is off).No audio (PROTECT LED is on).
CAUSE and SOLUTION:CAUSE and SOLUTION:
No voltage at BATT+ and/or REM terminals, orVoltage greater than 16V or less than 8.5V on
bad or no ground connection. Check voltagesBATT+ connection. Check vehicle charging
at amplifier terminals with VOM.system.
Y PROBLEM:Y PROBLEM:
No audio (PROTECT LED flashes every Distorted audio.
4 seconds).
CAUSE and SOLUTION:
CAUSE and SOLUTION:Input sensitivity is not set properly, or amplifier
DC voltage on amplifier output. Amplifier mayor source unit is defective. Check INPUT LEVEL
need service; see enclosed warranty card forsetting, or check speaker wires for shorts or
service information.grounds.
Y PROBLEM:Y PROBLEM:
No audio (PROTECT LED is on).Distorted audio (PROTECT LED flashes).
CAUSE and SOLUTION:CAUSE and SOLUTION:
Amplifier is overheated. Make sure amplifierShort circuit in speaker or wire. Remove
cooling is not blocked at mounting location;speaker leads one at a time to locate shorted
verify that speaker-system impedance is within speaker or wire, then repair.
specified limits.
Y PROBLEM:
Y PROBLEM:Music lacks Opunch.�
No audio (PROTECT and POWER LEDs flash).
CAUSE and SOLUTION:
CAUSE and SOLUTION:Speakers are not connected properly. Check
Voltage less than 9V on BATT+ connection.speaker connections for proper polarity.
Check vehicle charging system.
STATUS LEDs
Clip: Indicates the amplifier is being overdriven,
and your speakers may be in danger. This
should blink only on musical peaks, and not
be on constantly.
Power: Indicates the amplifier is on.
Protection: Refer to OTroubleshooting� for specific
indications.
Figure 15. LED status.
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