Troubleshooting
Setting up the Stereo Power Amplifier
This section describes problems you may encounter when using the Stereo Power Amplifier, and includes suggested solutions.
If these suggestions fail to cure the problem, please contact your Meridian dealer for further assistance.
No front panel indicator is shown
❍Check that your AC power supply is connected correctly.
❍Check that the ON OFF switch on the back panel is in the ON position.
❍Check that the fuse on the Stereo Power Amplifier back panel and the fuse in the unit’s power plug have not blown; see To change the mains fuse, page 15.
The output is noisy when using balanced leads
❍Check that the phono inputs are shorted, using the two phono shorting plugs supplied.
The sound has cut out
The 557 Stereo Power Amplifier includes a thermal shutdown, which mutes the output if the amplifier becomes too hot.
❍Leave the amplifier for a few minutes to cool down, and the sound will come back on.
The 557 Stereo Power Amplifier also includes a power circuit breaker to protect the loudspeakers.
❍Check the system for the cause of the cut out.
❍Switch off, wait 5 seconds, then switch on to reset the power.
The sound has a muddled stereo image and some information from the
❍Check that the BRIDGE MODE switch is OFF when using the amplifier in stereo.
When the BRIDGE MODE switch is ON, and both left and right inputs are connected, the left output will be the correct stereo left signal, but the right output will be a left minus right signal.
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