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From: DewDude on 23 Sep 2009 17:58
Hey all,

I have a Beckman-Industrial 20Mhz scope (not sure of model number)
that I need to repair. I don't have the owners/service manual for it
anymore nor do I have another scope that would aid me in fixing it.
There is something wrong with the second channel amplifier as it is
picking up noise regardless of if there's a probe connected to it or
not.

I'm wondering if anyone out there can recommend a good palce to send
this thing for repair.
From: N_Cook on 24 Sep 2009 03:15
DewDude <dewdude(a)gmail.com> wrote in message
news:07e4ce72-2c32-44c6-bdef-5eeb46079b94(a)m20g2000vbp.googlegroups.com...
> Hey all,
>
> I have a Beckman-Industrial 20Mhz scope (not sure of model number)
> that I need to repair. I don't have the owners/service manual for it
> anymore nor do I have another scope that would aid me in fixing it.
> There is something wrong with the second channel amplifier as it is
> picking up noise regardless of if there's a probe connected to it or
> not.
>
> I'm wondering if anyone out there can recommend a good palce to send
> this thing for repair.

You could try here.
But first go to Google / images and visually try and find the model number.

When indside you should , with luck, be faced with 2 identical
compenentwise, not topologically necessarily, both the same, then compare
node for node with a signal bridged between both inputs.

At 20M you may be lucky and not have to remove loads of screening , could
easily be just corrosion on an attenuator switch.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



From: Jay Moore on 24 Sep 2009 20:07
On Sep 24, 3:15 am, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> DewDude <dewd...(a)gmail.com> wrote in message
>
> news:07e4ce72-2c32-44c6-bdef-5eeb46079b94(a)m20g2000vbp.googlegroups.com...
>
> > Hey all,
>
> > I have a Beckman-Industrial 20Mhz scope (not sure of model number)
> > that I need to repair. I don't have the owners/service manual for it
> > anymore nor do I have another scope that would aid me in fixing it.
> > There is something wrong with the second channel amplifier as it is
> > picking up noise regardless of if there's a probe connected to it or
> > not.
>
> > I'm wondering if anyone out there can recommend a good palce to send
> > this thing for repair.
>
> You could try here.
> But first go to Google / images and visually try and find the model number.
>
> When indside you should , with luck, be faced with 2 identical
> compenentwise, not topologically necessarily, both the same, then compare
> node for node with a signal bridged between both inputs.
>
> At 20M you may be lucky and not have to remove loads of screening , could
> easily be just corrosion on an attenuator switch.
>
> --
> Diverse Devices, Southampton, England
> electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/

It's a Circuitmate 9020.

I've taken it apart once before but...I think I need a second scope to
be able to determine where the noise is...I considered trying to use
the scope's good channel to diagnose the second channel, but I doubt
that'll work.

There's no corrosion inside the machine...it's pretty clean. flipping
any of the switches doesn't make the problem go away...and it's not
anything loose as I poked around with the thing on. But, both amps are
pretty much the exact same thing...mirrors of each other basically.
Like I said, previous attempts to fix it have failed and I'm at the
point I should let a pro handle it.
From: denali on 4 Oct 2009 21:15
On Sep 23, 2:58 pm, DewDude <dewd...(a)gmail.com> wrote:
> Hey all,
>
> I have a Beckman-Industrial 20Mhz scope (not sure of model number)
> that I need to repair. I don't have the owners/service manual for it
> anymore nor do I have another scope that would aid me in fixing it.
> There is something wrong with the second channel amplifier as it is
> picking up noise regardless of if there's a probe connected to it or
> not.
>
> I'm wondering if anyone out there can recommend a good palce to send
> this thing for repair.

Why can't you trouble shoot the defective channel using the good
channel?
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