Question about Music
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Posted on Jan 02, 2017
SOURCE: Mackie 1604 VLZ3 Issue.
It sounds like power supply issues.
You may have bad capacitors and/or bad regulators.
If you have a multimeter you can get in there and check the dc voltages for ripple(ac voltage mixed with dc) or over/under voltages along the +/- 15volts lines.
Posted on Jan 20, 2010
Testimonial: "Good ideas, even though he didn't know the answer to the issue fully he was well rounded enough to give great ideas for in-house solutions!"
There are LED's all over these and you don't say which are lit... If they are mute or solo LED check the switches for a solo button or mute that is set.
IF they are the output level LED's plug in a set of phones and crank the phone volume up to losten if there is feedback or oscillation that is causing this.
HUM PICKUP due to a ground loop could be causing this. Make sure that ANYTHING connected to the unit that is also powered receives pwer from the SAME receptacle. If you have devices that receive power from a different receptacle you MAY have a ground loop. Noise on power lines can DAMAGE the equipment due to excedding the common mode input and output capability of the unit.
Finally, a strong local radio transmitter MAY be interfering. Sometimes the interference can go backward into the output lines to trigger the indicators.
As a test, when event occurs again, start unplugging anything connected to the mixer and see if disconnecting anything stops the problem. If you can have the problem with ONLY the power connected, then check if you have inadvertently created a loop within the unit by your settings.
Please refer to the "signal flow" diagrams in your user manual to see the possible feedback paths you can cause a loop to form.
REMEMBER the oscillation MAY be occuring well above the frequency you can hear !!!!
If you have access to an oscilloscope that would see if there is an oscillation going on.
Posted on Apr 18, 2010
Check for a defect on the solo switch. The rude lights when ANY solo is on. Sometimes the switches stick mechanically and don't fully come up.
Posted on Nov 06, 2010
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