Question about Vestax PMC-05PRO IV PMC-05 PRO 4 DJ MIXER

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The right output channel on the right side of my pmc 05 pro 4 has very low output. I can hear both right and left output channels in the headphones when I have the cue selected but when I try to monitor the master output the right output on the right side is extremely low. It also the same on the actual master output to my speakers. I've switched the input to make sure that it's not a bad RCA and it is not. It's internal in the mixer. Any suggestions?

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I assume you swapped thee output leads as well as the inputs which you di mention, to verify you amps and cables...
The Vestax schematic I have is NOT your same model, but the companies often re-use circuitry. In the schematic I have it appears that the two channels go through two levels of NJM2068L op amps.
In these two levels there is both a master gain control. It is important to know whether the gain control varies the output level of the right, even if it is low. Also in this gain control area is a master balance pot which varies the ratio of the left and right and is CAPABLE of taking either channel to near zero output... IF you have that control check it for sure !!! The pot is a dual employing both an A taper and C taper which is a reverse of the A.
The right tool for troubleshooting this is an oscilloscope, but first an inspection looking for board cracks around the output and pot area is in order.

Posted on Jan 02, 2011

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