Troubleshooting - NAD M51 Owner's Manual

CONDITION
No USB audio.
Remote control's [VOL 5/6] no function.
Remote control's [MUTE] no function.
Cannot power ON the M51.
VFD is dim.
M51 does not respond to remote control
commands.
RESTORING M51 TO ITS FACTORY DEFAULT SETTINGS
1 Press and hold front panel [INPUT] button.
2 Set to ON the rear panel POWER switch while still holding on to [INPUT] button.
3 VFD illuminates. Release [INPUT] button. VFD will show
SETUP VFD TEST
V1.xx
"VFD TEST" is flashing. V1.xx stands for the software version.
4 Within 3 seconds, press front panel Standby button and "RESET" will now flash.
5 M51 will go to reset mode with the VFD showing "Factory Reset.. " .
The M51 is now reset and will automatically shut down.
POSSIBLE CAUSES
• NAD USB Audio is not installed in your PC.
• Sound or Audio device setting of your PC or
Mac is not set to "NAD Audio 2.0 Output".
• No music files being played back from your PC
or Mac.
• Mac OS not updated to include NAD USB Audio.
• "Volume Setup" is set to "Fixed".
• Rear panel POWER switched off.
• Low brightness level of VFD is selected.
• Batteries are flat or incorrectly inserted.
• Infrared receiver (IR) window of M51 or IR
transmitter of the remote control is obstructed.
• M51 front panel is in very bright sunlight or
ambient light.
• Remote control is set to M50 Digital Music
Player remote control codes.
RESET
REFERENCE

TROUBLESHOOTING

POSSIBLE SOLUTIONS
• Download NAD USB Audio driver from NAD
website and install to your PC.
• Set your PC or Mac Audio or Sound device
setting to "NAD Audio 2.0 Output".
• Playback a music file from your computer.
• Download latest update for your Mac OS.
• Set "Volume Setup" to "Variable.
• Set to "ON" the rear panel POWER switch
and then press front panel Standby button.
• Toggle [DIM] button until desired
brightness level.
• Check batteries.
• Check IR windows and ensure clear line-of-
sight from remote to M51.
• Reduce sunlight/room lighting.
• Switch remote control codes to M51 Direct
Digital DAC. Press and hold "5" and "1" at the
same time until the remote control's blue
transmit LED flashes twice.
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