I did forget to say my voltages were in range as well on the ribbon cables, amongst other things. But, I'm not a tech - just a lowly newbie. :)

Tracy
--------------------------------------------

On Thu, 7/12/18, taco taco tacosaresoawesome@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:

Subject: Re: [chromapolaris] RE: Polaris Later version Secondary board
To: chromapolaris@yahoogroups.com
Date: Thursday, July 12, 2018, 11:21 PM


 









Hello All,I too have a Polaris which
I’ve added new membrane panel to.Initially it
was all frozen, gradually by power cycling (and getting to
the tune function etc) it will go a few minutes before
crashing in the same manner as described by
Conor.All my voltages appear good. So Paul do you
suggest psu ripple or faded EPROMs as probable
causes?I calibrated my DAC (dc offset) which made
it better but the machine still crashes without fail. I
thought I would chime in here as it might be a common issue
caused by ??Thanks!

Sent
from my iPhone
On 13 Jul 2018, at
12:15, 'Paul D. DeRocco' pderocco@...
[chromapolaris] <chromapolaris@yahoogroups.com>
wrote:
















 






> From: Conor Strachan [mailto:conor.strachan@...]


>

> I am having a few issues with my Polaris, it has the
new

> membrane panels and was working fine for over a year
and then

> all of a sudden it started to play up.

>

> It is turning on and then after about 10 seconds the
panel is

> freezing along with the notes sustaining or gliding
then sustaining.

>

> I am consulting the service manual but there is a lot
of

> reference to the older secondary power board and I have
the

> later one so it is a little confusing.

>

> I have checked my DC OK which I believe should be +5v
(brown

> wire P3) but it goes to about +4.75v when it is first
turned

> on with panel access then it fluctuates up to 4.80v and
it

> stays around the +4.80v mark where the panel is
frozen.

>

> According to the manual it says there is no way to
adjust

> anything on the DCOK side on the later boards.

>

> Just wondering if you have any suggestions of where to
go next..



Does it ever unfreeze spontaineously, or do you have to
cycle the power to get it going again?



I doubt it's a DCOK problem. You should check all the
power supply voltages.. If you have access to a scope, you
should also make sure that the supplies have no significant
power line ripple on them. That can happen when the big caps
on the power supply dry out.



It's also possible that the EPROMs are fading. That can
be fixed by erasing them and reprogramming them with the
files available on the rhodeschroma.com site. If
you don't have a programmer, and can't find someone
nearby who does, they're available on eBay for about
$50.



I've cc-ed this to the mailing list, so that others can
put in their two cents.



--



Ciao, Paul D. DeRocco

Paul mailto:pderocco@...


























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