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Volume control on unit failed, r/c volume okay.

Over a period of a few weeks, the volume control on the unit became intermittent, then failed totally to respond to rotational movement. The remote control works fine. Have removed volume control knob assembly from PCB (left body attached to PCB). No obvious sign of excessive wear on contacts (knob or PCB-attached contacts). Small amount of factory-installed grease relocated (to simulate new product). Re-assembled whole unit, problem remains (naturally...) Is problem most likely (or has experience proven): - volume control assembly worn out, needing replacement? - contacts (within control) needing 'repositioning', to ensure greater friction between surfaces? - analogue components (pull-up and/or pull-down) between volume control and digital IC failed? - digital IC failed (no longer 'reading' changes from volume control)? (All of the above?!) Thanks...

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hi, ya, someimes the POT i.e the volume controller variable resistor loses its contacts with the carbon strip. tru using some switch cleaning solution( NoN Acidic) to clean the POT,let me know

Posted on Dec 30, 2007

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I bet your unit is about 4 years old...
I have installed 4 of these systems 4 years ago and each is failing at about the 4 year mark (3 so far).

The flashing volume lights are a communication error, meaning the keypads are not communicating with the controller. If all of the keypads are doing the same thing and your have checked your cables then the problem is with the controller. I would unplug the unit for a few days and see if that helps.

It appears the units work consistently and reliably for about 4 years however in my case 75% have failed at the 4 year mark.

Fortunately I have a meter and oscilloscope and determined why they are failing. The main power supply unit that feed power to the 5VDC regulator is failing.

It is not clear whether M&S replacement units have addressed this problem or not. Therefore, to fix the problem for my customers, I added and additional small power supply (fits inside the case) and injected the signal on the input side of the 5VDC regulator. My solution hopefully will not expire after 4 years.

It appears to me from my small sample size that M&S may have a flaw in their original engineering and replacing it with the same will guarantee future failure.

I hope this helps others. :)

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