Author Topic: Dartron D20 Dual Trace Scope  (Read 1662 times)

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Offline Prime

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Dartron D20 Dual Trace Scope
« on: June 24, 2016, 10:17:18 pm »
Hi there,

I have a Dartron D20 Dual Trace scope that I'd like to fix. Does anyone have a copy of the manual lying around or know where I can find one?

One channel works, the other is dicey - i just can't remember what is wrong with it since it's been a while.

Thanks
« Last Edit: June 25, 2016, 02:26:16 pm by Prime »
 

Offline tautech

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Re: Dartron D20 Dual Trace Scope
« Reply #1 on: June 24, 2016, 10:28:32 pm »
You'll need to get it out and recheck things but for now just try and give the faulty channel selectors some "exercise" in case there's just some oxidisation on the selector/switch contacts.

Can you post up a pic of the display showing the fault?

There's quite a bit you can do without a manual as you've got one working channel to get measurements from.
If you have another scope you can just follow the input signal path (both channels same signal, internal 1KHz Cal is good)) until you find where it goes astray. Then check the components in that stage.

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Offline tautech

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Re: Dartron D20 Dual Trace Scope
« Reply #2 on: June 24, 2016, 10:35:51 pm »
Google can't even find any Darton scopes, you'd better post a pic of the scope just in case we recognise it as a rebrand.

Pretty obscure brand, all I could find:
http://www.collection.archivist.info/searchv13.php?searchstr=Dartron+IS

Seems like you have to contact then for the manual to be scanned.  :(
« Last Edit: June 24, 2016, 11:21:58 pm by tautech »
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Offline Hydrawerk

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Re: Dartron D20 Dual Trace Scope
« Reply #3 on: June 24, 2016, 11:01:46 pm »
Datron or Darton?
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Offline tautech

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Re: Dartron D20 Dual Trace Scope
« Reply #4 on: June 24, 2016, 11:32:56 pm »
Following a few leads  ;) I wonder if it's the same as this one:  :-//
http://www.radiomuseum.org/r/grundig_oscilloscope_mo_20mo2.html
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Offline Prime

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Re: Dartron D20 Dual Trace Scope
« Reply #5 on: June 25, 2016, 02:26:57 pm »
Following a few leads  ;) I wonder if it's the same as this one:  :-//
http://www.radiomuseum.org/r/grundig_oscilloscope_mo_20mo2.html

Dartron. See I made a typo in the post (not the title)
 

Offline Prime

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Re: Dartron D20 Dual Trace Scope
« Reply #6 on: June 25, 2016, 02:48:09 pm »
Following a few leads  ;) I wonder if it's the same as this one:  :-//
http://www.radiomuseum.org/r/grundig_oscilloscope_mo_20mo2.html

Nope.  :(

Pictures attached. I opened it up last night to look inside but forgot to take pictures. It's all discrete components on two large boards (No valves like my philips) and Nichicon capacitors. The tube said made in Kent so I assume it's British made but there is no address on the labels on it.


Google can't even find any Darton scopes, you'd better post a pic of the scope just in case we recognise it as a rebrand.

Pretty obscure brand, all I could find:
http://www.collection.archivist.info/searchv13.php?searchstr=Dartron+IS

Seems like you have to contact then for the manual to be scanned.  :(

Yeah, that is all I have turned up. I'll probably email him next week if I don't come right


You'll need to get it out and recheck things but for now just try and give the faulty channel selectors some "exercise" in case there's just some oxidisation on the selector/switch contacts.

Can you post up a pic of the display showing the fault?

There's quite a bit you can do without a manual as you've got one working channel to get measurements from.
If you have another scope you can just follow the input signal path (both channels same signal, internal 1KHz Cal is good)) until you find where it goes astray. Then check the components in that stage.



The second channel doesn't detect anything and it's very noisy.

I'll put it on a signal gen at work and see if I can trace the location of the fault. Good Idea. Thanks  :)

Also, I see the tube needs a slight rotation   ::)
« Last Edit: June 25, 2016, 02:52:37 pm by Prime »
 

Offline coppice

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Re: Dartron D20 Dual Trace Scope
« Reply #7 on: June 25, 2016, 03:42:54 pm »
The kinda looks like a Scopex scope with a replacement front sheet that says Dartron. E.g. http://www.radiomuseum.org/r/scopex_oscilloscope_4d10a.html. Obviously not that exact model, as the buttons are different, but it looks similar enough that I would guess there is common ancestry/
 

Offline Prime

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Re: Dartron D20 Dual Trace Scope
« Reply #8 on: June 29, 2016, 11:03:07 pm »
The kinda looks like a Scopex scope with a replacement front sheet that says Dartron. E.g. http://www.radiomuseum.org/r/scopex_oscilloscope_4d10a.html. Obviously not that exact model, as the buttons are different, but it looks similar enough that I would guess there is common ancestry/
The inside is completely different. The knobs are fairly complex and couldn't be split like that. And this scope uses at least 3 pcbs.







I presume that stub is some sort of impedance match.



So I found the first problem - broken wire from the input conditioner circuits on the control knob. But it looks like I will need to replace those matched input jfets that are in sockets. I blew one swapping them out to test channel 2. It's reading but it's under reading now.

ITT and Nippon? capacitors.

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