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Subject: Re: [chromapolaris] OK - I Have Diagnostics Now And They Are Weird

From: Bob Grieb <bobgrieb@...>
Date: 2018-06-09

Z207, assuming it's a 4053B, if missing will silence most of the first voice.
But the osc B pulse wave should be OK on that voice.

Syntaur has Polaris keys. Much nicer than gluing the bits together...


--------------------------------------------
On Sat, 6/9/18, Tracy Barber adirondack_pc@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:

Subject: Re: [chromapolaris] OK - I Have Diagnostics Now And They Are Weird
To: chromapolaris@yahoogroups.com
Date: Saturday, June 9, 2018, 1:42 AM

I checked all of the matrix with the
Fluke.  Positive results!  After a fashion...

The right top board measured in the
3.7x M Ohms range - all of them.  The left top board
had some crap in the connector or something.  I used
canned air first and then some Deoxy D5.  Used the
leads in a consistent fashion and they ranged from 306 - 363
M Ohms.  So, this is a good thing.

I had to trim the ribbon cables a
smidgeon and checked if they were even across.  After
the Deoxy, they went in a little more than before. 
This was the replacement board for the one in it when I
bought it.  I think there may have been some Q.A.
issues sending that board out but I won't get into it here.

Further, broke a key but trusty old
gorilla glue to the rescue! 

Reseated EVERY DAMN chip and jumper in
that beast and lost 1 chip.  A non-CEM, good
thing...  $2.95 for a replacement.

So, the ribbon cables check out so far,
the key is fixed and playable and I've reseated the entire
mutha...  I'll get that chip ASAP because it may not
work otherwise, unless it simply cuts off one of my 6
channels.  Z207 clan...

Now what, boss?  Anything I can do
with the chip missing or should I wait?

Tracy




--------------------------------------------
On Fri, 6/1/18, Bob Grieb bobgrieb@...
[chromapolaris] <chromapolaris@yahoogroups.com>
wrote:

Subject: Re: [chromapolaris] OK - I
Have Diagnostics Now And They Are Weird
To: chromapolaris@yahoogroups.com
Date: Friday, June 1, 2018, 4:53 PM


 



 


   
     
     
      Resistance is
measured in ohms.



You never measure resistance in a
circuit with the power
on.

The meter uses its own current to
measure the resistance.

Any current in the same circuit from
the power being on will


cause an incorrect reading.



I don't think there is anything wrong
with the new
panels.

More likely something else could be
causing a short between
those

two signals.  But we haven't
even determined that a
short exists,

it's just a theory at this point.



As I said before, measure the
resistance between other pairs
of SWSTB signals

to see what the resistance measures
(should be high)  then
compare that with

the two signals I mentioned.



Maybe you should download the manual
for the meter that you
are using and

review how to use it for simple
measurements?




--------------------------------------------

On Fri, 6/1/18, Tracy Barber adirondack_pc@...
[chromapolaris] <chromapolaris@yahoogroups.com>
wrote:



Subject: Re: [chromapolaris] OK - I
Have Diagnostics Now And
They Are Weird

  To: chromapolaris@yahoogroups.com

  Date: Friday, June 1, 2018, 2:44
PM

 

  So, stick the lack lead on one
and the red

  lead on the other?  What Ohms /
Volts will I be looking

  for?  Anything above 0?

 

  The membranes are pretty tough
now that

  Paul redid them.  I have to
watch it though because

  they have been jiggled around a
bit.

 

  OK, I see - high resistance. 

  check for high Ohms on the
pairs.  Unless I was sold a

  bad brand new set of face
"plates", they should
be

  fine.  Each line in the ribbons
are good, except one

  has a small piece missing. 
Still 3/4 there.

 

  Try this with the power on?

 

  Since last message, I have
reseated the

  connectors and have done so much
with it I should be a
whiz,

  but no - just a Dummy for
Electronics.  Except for

  computers, which are close but
not close enough.

 

  Tracy

 

 
--------------------------------------------

  On Fri, 6/1/18, Bob Grieb bobgrieb@...

  [chromapolaris] <chromapolaris@yahoogroups.com>

  wrote:

 

  Subject: Re: [chromapolaris] OK
- I

  Have Diagnostics Now And They
Are Weird

  To: chromapolaris@yahoogroups.com

  Date: Friday, June 1, 2018,
8:50 AM

 

 

   

 

 

 

    

 

 

      

        

        

         What I would

  suggest is that you use a
multimeter

  to see if there is an
electrical

  connection

 

  between the two signals that I

  mentioned.   You can
measure

  between other SWSTB pairs

 

  to see what the resistance
should be

  (high).   I would say

  do not unplug the flexes from
the

 

  membranes, or do any cleaning
or

  spraying until you have

  determined if there is a
problem.

 

  If you find a connection
between those

  two signals that

  shouldn't be there, then try
to

  figure

 

  out where the short is.  
But do

  your measurements first,

  especially since the flexes are


 

  somewhat fragile and you don't
want to

  mess with them

  any more than absolutely
necessary.

 

 

 

  Ideally, you use a meter and
an

  oscilloscope to make

  measurements that indicate

 

  where problems lie, then you
change

  chips, fix traces, etc

  to fix the problem.

 

 

 

  Bob

 

 

 

 

 
--------------------------------------------

 

  On Fri, 6/1/18, Tracy Barber adirondack_pc@...

  [chromapolaris] <chromapolaris@yahoogroups.com>

  wrote:

 

 

 

  Subject: Re: [chromapolaris] OK
- I

  Have Diagnostics Now And

  They Are Weird

 

    To: chromapolaris@yahoogroups.com

 

    Date: Friday, June 1, 2018,

  12:58 AM

 

   

 

    Bob -

 

   

 

    I actually have them here. 

 

    Section 9 of the service
manual

  has the pairs. 

  That's

 

    where I got the info, from
the

  site.  You have a good

 

    idea, however...  I was
looking

  at these but didn't

 

    come up with any way to do

  anything with them.  Your

 

    example would be "J" and
"K",

  vibrato

  and pitch pedal, glide

 

    and rate pedal if you put
all

  the cross overs together.

 

   

 

    So, you're saying check out
the

  ribbon

 

    cables again for anything out
of

  the ordinary?  That I

 

    can do.  Clean them with

  alcohol, yes?

 

   

 

    I sprayed the connectors
with

  canned

 

    air and used a little Deoxy
D5

  on them to clean them up

 

    already.  Made sure they
were

  in and lined up

 

    properly.

 

   

 

    Unfortunately, I can't check
the

  side

 

    that is connected to the
face

  plates because they're

  buried

 

    under the material.  Also,

  they're brand new. 

 

    Sheesh...  I also did the
"S"

  curve as told to

  by the

 

    video.   I sure wished

  they would've spent a few more

  $

 

    on real connectors.  You
also

  can't get a swab in

  there

 

    to clean the contacts
better. 

  I wonder if an alcohol

 

    pad would work?

 

   

 

    Tracy

 

   

 

    ∗∗∗∗

 

    

 

    

 

     If you go to this site,
and

  scroll

 

    down to the bottom, you

 

     can see the connections
to the

  front

 

    panel membrane

 

     switches.

 

    

 

     These are not shown in
the

  service

 

    manual schematics.

 

    

 

    

 

    

 

   

 
http://www.rhodeschroma.com/?id=polarisserviceschematics

 

    

 

    

 

    

 

     If you look at switches
A and G

  you

 

    will see that one end of

 

     each is common, and
only the

  other end

 

    is different.

 

    

 

     One connects to J9A-3
SWSTB4

  and the

 

    other connects to J9A-4

 

     SWSTB5.   If
something

  is

 

    shorting those two

 

    

 

     signals together, such
as a

  solder

 

    splash, or possibly a bit

 

     of the old membrane
flex still

  in the

 

    connector, then when

 

    

 

    

 

     you press G, you could
get an

  A. 

 

     A lot of other pairs
of

 

     switches would also be
joined

  by such

 

    a short.   I suggest

 

    

 

    

 

     you troubleshoot the
front

  panel issue

 

    and get it resolved

 

     before trying to
troubleshoot

  anything

 

    else.  A DMM

 

     measuring

 

    

 

     resistance should help
to see

  if there

 

    is some kind of short

 

     between those two
signals.

 

    

 

    

 

    

 

     Bob

 

 

 

 
------------------------------------

  Posted by: Tracy Barber <adirondack_pc@...>

 
------------------------------------

 

 

 
------------------------------------

 

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------------------------------------
Posted by: Tracy Barber <adirondack_pc@...>
------------------------------------


------------------------------------

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