If you need the DSP then consider replacing the ROM as detailed elsewhere. No DSP or digital functions (like DTS, Dolby, etc) are available. This functionality works for me (I only use one internet-connected source into my amp) but may not work for you. Note: even with this fix any change to the ‘source’ will cause the amp to mute until it is power cycled. Ī.Re-attach “EXT.IN” inputs to test and feed in a signalī.Power on the amp and slowly increase main volume from lowest volume.Ĭ.If this fix has been successful then you will hear sound from your speakers when the main volume is much lower that in step 1.ĭ.Having confirmed the fix, reassemble the unit (you could run it permanently without the failed DSP board).Į.Enjoy a few more years out of your amp instead of dumping it! Į.Use a solder blob to short pins 3 and 4 of this connector. In this step we disable the mute (permanently).ī.Take off the top case (as described in the service manual)Ĭ.Unscrew the back panel (a lot of screws!)ĭ.Remove the DSP card to give access to connecter CX114 on the base PCB. The electronic mute used is not infinite, hence why the test in step 1 works. I think what was happening on my system was that because the main DSP was failing (probably due to the ROM failing as described elsewhere) the microcontroller was then muting the signal. Some are electronic and some are electromechanical (i.e. There are a couple of places in the audio signal path that the system can mute the sound. Step 2 - disable the mute which is in place G.Note if you do any other adjustment to sources at this point then you will have to power-cycle the system. phone, MP3 player, computer) ĭ.Turn up the volume to around 0dB - you should hear nothing.į.Only adjust the main volume, turning it gradually up to +18db - you should hear the EXT.IN source signal coming faintly out the speakers. Step 1 - confirm your amp has the same fault symptoms as mine had:Ī.Connect a source to the FL/FR EXT.
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