Question about Mackie 1604 Vlz3 16 Channel Mixer

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I have a Mackie CR1604 that hasn't been used for several years. When plugged in, a hum results on all channels, some channels louder than others. The hum gets louder as the sliders increase. Is it worth fixing and are there any techs in the Boston area that can handle it? Thanks, Bill

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This should be a fairly reasonable repair. The main problem is finding the source of the hum. Since it is effected by the sliders, the source is in the mic pre-amp sections. Since all channels are effected, I would suspect a power supply problem rather than a problem with the electronics. Please send a note to Lauren@fixya.com asking her for contact information for me. I can help you out. These are decent mixers (I own a few) and should last for many years. Yours just needs a little TLC.

Dan

Posted on Mar 27, 2011

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If it is a 60Hz or 120 hz hum, the fault may be a bad solder connection to a filter capacitor in the power supply.

If it is a hum like a bad mic connection, you may have dirty contacts on an input, dirty tracks on a mixer control, even on the EQ portion.

It may also be a bad cable is connected, or a 1/4 inch jacked input may not be grounding out when the plug is removed. You may have a bad ground on the power feed and you have a ground loop as a result, or a cable is faulty and creating it's pwn ground loop to something else.

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