Question about Yamaha P3500S Amplifier

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We understand that your problem is: Hi i am a technician in nairobi kenya and i have a wide experience in problems relating to yamaha keyaboards and many amplifiers and mixers, i wnat to share this thoughts,ho can i? thank.

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I have its service manual we can talk and i willsend it to you.

Posted on Feb 17, 2014

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    kindly call me 0720781215 or email me on


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SOURCE: I have a EMX88S Audio mixer amplifier that is

What you need is test equipment and good troubleshooting skills, not any certificate.

I suspect the clicking has to do with the digital effects part of the unit. If the clicking is very REGULAR it is probably the DSP for the effects restarting periodically. I had one of these problems and quickly traced it to finding the power (5 volts in my case) was dipping below the power-on-reset threshold. This was due to a bad filter cap for the 5 volts supply.

If the clicking is random, I suspect the problem is with the A-D or D-A and could be a missing data bit. When the data happens to have a particular value, if a bit is missing you get a step in the output. Find this with an ooscilloscope. To go deeper, you have to use your logic analyzer which is unlikely you have. If you suspect the A-D or D-A, first try cooling them with circuit cooler. Cooling speeds up the response of silicon chips.

Here is your service manual:

Posted on Mar 03, 2011

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