RE: sencore cr70 repair

At a guess (without having schematic access) I would say one is low range
limit and the other high.

Use a fine sharpie to mark the existing positions of the two pots.

I would turn on the unit, let it sit a few minutes to warm then set the
G1/G2 to minimum. Then slowly tweak the R24 pot up / down and see if it
does anything to the low end range. If not try R23. I bet one or the other
will adjust the minimum swing point.

Then adjust it to max and tweak the other to see if that pulls the high end
max down to where it should be.

David

From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Darren Finck
Sent: Wednesday, February 27, 2013 7:27 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: sencore cr70 repair

The problem is that after replacing IC4 it's no longer calibrated and it's
failing the test procedure. The voltage on G1/G2 is supposed to swing from
20 to 400 volts but it's actually swinging from 80 to about 460 volts

Can anybody help explain the purpose of pots R24, R23, and how I might want
to adjust them to recalibrate the unit properly? It looks like I need to
adjust both of these but I don't know how.

-joey

On Tue, Jan 15, 2013 at 10:45 AM, Joey Oravec <joeyoravec@gmail.com> wrote:

I already have the schematics, parts list, and manual but there are various
pots that surely need adjustment after changing out components.

Have you scanned the schematics? If so, send a copy (or a link to them) and
I'll be glad to look at them and try explaining the purpose of the pots
you're asking about. I have a CR31, and had to dig pretty deep into it to
repair it, so I became pretty familiar with its schematics & operation. So
with the expectation that the CR70 is similar to the CR31, I should be able
to follow it pretty well.

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Received on Wed Feb 27 23:03:31 2013