Unit does not function when Power On Switch
Display lights, but there's no sound.
There is sound on only one side, or the sound
The MAS 100/MAS 110 does not respond to remote
The tuner is buzzing intermittently
Make sure the AC power cord is securely plugged into an unswitched outlet.
If the "PROTECT" message appears, press and hold the remote control Power Button for
at least 1 second to turn off the MAS 100/MAS 110, then unplug the system. Do not use
it without first bringing it to an authorized Harman Kardon
service center for inspection.
Press the Mute Button to make sure the system is not muted.
Turn up the volume.
Check that the correct source was selected. If the source is an external
device, make sure it is plugged in, turned on and playing, and that it is
properly connected to one of the auxiliary inputs.
If the headphones are in use, unplug them.
Make sure both speakers are securely connected with the correct polarity,
and that no wires are touching each other and creating a short circuit.
There may be a problem with one of the speakers. Bring the MAS 100/MAS 110
to an authorized Harman Kardon service center for inspection and service.
The batteries in the remote control may require replacement.
The IR sensor may be blocked. The sensor is located on the right half of the controller's
Adjust the placement of the antenna to improve reception.
Check that the antenna is securely connected to the rear-panel terminal.