Question about SpeakerCraft MZC-66 Amplifier
I am a service engineer and have serviced a few of these units, you can send it back to speakercraft direct but they will charge you an arm and a leg for it, they are very 'cloak and dagger' about supplying parts and service info to anyone else including dealers.
I must say from the outset that these units are not a straight forward amp like some of the posting are suggesting... any professional engineer will not be able to diagnose a problem for a written symptom. these systems require a programmer via a software driven interface to set them up which only a dealer will have. so in some cases a re program can solve the issues.
The amp's (6xstereo modules) are very low powered at about 5w per channel so they are a common problem and each one cost's about £100.+VAT and then labour cost's, but they are loaded with a very complex matrix system for looping video and audio plus the CAT5e localised Keypad's... these are £5K systems when new, but you probably know that.
One way for you to get an better idea of were the problem might lie is to find a pair of powered speakers like PC speakers and connect them to the 'Pre-Out' connections on the rear of the unit located directly above the EZ-PAD connection on the rear.
You should be able to hear audio out of these outputs (one for each zone) and depending on the zone you connect to you will hear the corresponding audio that is selected in that area on the keypad.
if you do hear audio from each zone but not from the speaker outputs then it could be a number of problems probably caused by one or more of the AMP modules failing (which is common).
If you power up the amp with it connected and don't pass any audio through it, put your ear right up to the speakers in each zone and you should hear a VERY faint hissing coming from the speakers (which is good). Which ever zones are not emitting that hissing correspond to the amp modules that are faulty.
If you can't get any audio from the pre-out's on each zone on the rear of the MZC66 then it could simply need a re-program.
sometimes when a amp module blows it takes out another board and they are expensive.
This won't fix the problem but may go some way to helping you get a better idea of the problem if you haven't already.
Posted on Sep 03, 2010
I repair these
$100 per Zone Plus return shipping.
Posted on Sep 13, 2010
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Posted on Jan 02, 2017
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