Rhodes Chroma Polaris

I've sent a message that doesnt seem to be posting, maybe because of attachments? I'll post pictures seperately...

 Soooo....got the Polaris, it's missing the 10000uf16V cap in the power supply, so thats a problem right away.

It's missing ALL the CEM3372 filter chips. Ugh. I found someone who will sell me 6 of them for 225$ - it's also missing a CEM3374. Ugh. I can probably get one for around 50-70$?

 So, after the purchase price (400$ shipped), +300$ for CEM's, another 225$ for a membrane panel, is this financially viable to move forward on? 

  I will do the work myself, I'm afraid that something else will pop up that will make it not worth fixing. 

I will post pictures of the board and see if anyone spots anything really bad. There are definitely some IC's missing, I'm just not sure yet which ones besides the CEM's.

thanks for any and all help

tom

> So, after the purchase price (400$ shipped), +300$ for CEM's, another
> 225$ for a membrane panel, is this financially viable to move forward on?

On Fri, 3/31/17, Florian Anwander fanwander@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:

Subject: Re: [chromapolaris] Help with moving forward with this Polaris
To: chromapolaris@yahoogroups.com
Date: Friday, March 31, 2017, 11:19 AM

Hello Tom

Am 31.03.2017 um 17:05 schrieb nuwavboy@...
[chromapolaris]:
>  So, after the
purchase price (400$ shipped), +300$ for CEM's, another

> 225$ for a membrane panel, is this
financially viable to move forward on?
It looks someone had a reason, that he used
this Polaris as a spare part
reservoir. It
must have stopped working, before he decided to
"bone" it.
You don't shred a
working chroma polaris. So I assume, after you will
have redone the capacitor and the CEMs and the
panel you will find, that
the CPU is not
working (or what else ever).

I have to admit: I doubt it makes sense to go
on.

Florian

--
http://www.florian-anwander.de



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Posted by: Florian Anwander <fanwander@...>
------------------------------------


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> From: tom
>
> Well, I realized I have a Prophet 600 that has 3372 chips, so
> I think I'm going to try and redo the power supply first and
> take it from there...
>
> Can anyone tell me what chips go into Z18 and Z64? Those are
> the only other ones that seem to be missing

> ... Can anyone tell me what chips go into Z18 and Z64? Those are the
> only other ones that seem to be missing

> From: tom
>
> ok, recapped the power supply, replaced the 74sl244, so I'm missing
>
> the MM5387 noise generator
> One CEM3374
> ALL CEM3372's
> ONE SN74HC374N
>
> Am I going to hurt anything by powering it back on?
> I have a Prophet 600 I can pull the CEM3372's from, but I
> dont want to take a chance yet in powering it up with those in.

On Fri, 3/31/17, nuwavboy@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:

Subject: RE: [chromapolaris] Help with moving forward with this Polaris
To: chromapolaris@yahoogroups.com
Date: Friday, March 31, 2017, 5:03 PM


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Thanks for the help on this Paul - 
 Where it stands now
- 
 powers up, but
lights come on, most of them, turn off and back on,
different lights come on..etc...but mainly all to most
lights come on and are non-responsive
 The left side panel has had the
ribbon connector extended out from the circuit board, its
done well, I checked for continuity and connections are
good.
 Right side
panel is cracked on both pigtails. I tried cutting back and
using acetone, but they cracked again, there's not much
left, can't really make the bend anymore. I could
attempt to solder wires to it, I do have a temp controlled
iron and could try it on low wattage, but....
  So I'm stuck  - do I throw
good money after bad? I'm in it for 400$, then another
300$ for 6 CEM3372 and 1 CEM3374, then another 200$+ for a
new membrane panel...
  Do I sell it for parts? 5
CEM3374, 50$ a pop...I hate to see something like this
turned into a carcass, but I'm afraid of what else may
lurk underneath. My gut tells me a new membrane panel and
new CEM's will fix it right up, but...

> Where it stands now -
>
> powers up, but lights come on, most of them, turn off and back on,
> different lights come on..etc...but mainly all to most lights come on
> and are non-responsive...

> From: David Clarke
>
> Looking at the photos on the Polaris site (e.g.,
> https://groups.yahoo.com/neo/groups/chromapolaris/photos/album
> s/94582759/lightbox/1719827875?prop=eupdate#zax/1719827875)
> do I see that only Qty 2 RAM chips are installed - and those
> are 6116's?
>
> Paul D. can confirm, but before I'd expect you'd otherwise be able to
> see 'normal' operation I'd expect that more RAM would be
> needed (either
> as more chips - or different chips) - e.g., at least Qty 2
> 6264's - or
> Qty 8 6116's:
>
> http://www.rhodeschroma.com/?id=polarisservicecircuitdescriptions#memoryarray

> From: Tom
>
> ok - - ordered 6 6264's
>
> All remaining CEM chips and misc missing IC's
>
> Re-capped the power supply, and will be installing new
> voltage regulators soon.
>
> Will be ordering new panel this week.
>
> Will be burning new OS eproms - will 27256 work instead of 27128's?
>
> Will install new slider....
>
> I will photograph as I go...fingers crossed!

> From: Tom
>
> Was going to replace all the voltage regulators as a
> preemptive measure...Is that not really necessary? Ive just
> had 2 synths recently with bad regulators -
>
> So...list of items to do...
>
> New OS Eproms burned
> Install CEM 3372's and CEM3374
> Install missing remaining IC's
> Remove and install new membrane
> Install new memory chips (6 6464)
>
> Cross fingers and toes and hope for the best

> So...list of items to do...
> ... Install new memory chips (6 6464)

> From: David Clarke
>
> It may go without saying - but just for clarity, it wouldn't
> be expected
> that you'd keep the existing two 6116 chips and additionally
> install six
> 6464's - but instead you'd remove the current 6116 chips, install the
> six 6464's into locations Z2, Z3, Z4, Z5, Z6 and Z7 and then
> change the
> jumper on the board to reflect 8k chips vs. 2k.