> From: merolasteve
>
> Hi everyone. I joined up in anticipation of buying a
> non-working Polaris. I now have it in my possession.
>
> It is in great cosmetic, but non-working shape. When I power
> it on just about all the LEDs light up, but that is about it.
> Pressing the buttons does nothing and the keys and sliders
> don't do anything either. I tried the cold and warm reset,
> but nothing happened. I have not done the full reset,
> although since the buttons do not appear to work I don't know
> if that would work. I wanted to check here to see what the
> next step is. I did a few searches, but could not find a
> similar problem. I have not opened it up yet because I heard
> that can possibly damage the membrane connections further.
> The only sound is a constant, faint hum/noise sound. Any
> suggestions on where to start would be appreciated.

The FIRST thing to do is to open it up and see if you've got the early
power supply version that has three trimpots on it. If so, the problem may
be that the DC OK threshold is set incorrectly, so the CPU is being held
in the reset state. This is a very common situation, and easy to fix. If
LED CR10 is off, then turn R17 CW until it turns on, and go maybe 5 or 10
degrees past that point.

If the LED is already on, or you've got the newer power supply with only
two trimpots, then it will take a more thorough diagnosis.

Just opening the unit up shouldn't damage the membrane switch tails, as
long as you don't accidentally bump them as you set the control panel
assembly down.

--

Ciao, Paul D. DeRocco
Paul mailto:pderocco@...