Yes, sure, I have forgotten the link, here it is:

https://forum.electronicwerkstatt.d.....84308

Sorry!

Now you can check all the voltages.

Another checks:

Is the capstan rubber belt ok?
Is the capstan platen mounted in center position?
Check the voltage at the DTF (Dynamic-track-following) contacts on top of the head drum (two sliders) with an oscilloscope: The voltage should be nearly constant, no breakouts up or down in play mode. In "pause"-mode or in "fast picture search" the DTF-voltage must rise up and fall down very fast, because the video heads get controlled with piezo elements, on wich the heads are mounted, so the picture frame or the picture search should be without any stripes on the screen.

Best regards,
stego



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I think that all the voltages are in spec.
Pin Specification Standby Play Mode
1 12d 12.4
2 12d 12.4
3 earth
4 earth
5 0 0 3.3
6 5f 0.3 4.8
7 5e 4.5
8 9e 9.4
9 0w 17.8 0
10 15w 9.5 15
11 9d 9.4
12 12f 0.2 12.2
13 12w 0 12.2
14 12a 0
15 12w 3.4 11.7
16 4.5 4.8
17 12w 0.2 12
18 20a 0 20.7
19 20f 0 20.7
20 33d 33.4
21 -150d -157
22 150d 166
23 -7d -6.7

What happened to the beautiful formatting of my table above?!

is the capstan rubber belt ok?
Yes it is new
Is the capstan platen mounted in center position?

??? Not sure which bit this is Th???

Check the voltage at the DTF (Dynamic-track-following) contacts on top of the head drum (two sliders) with an oscilloscope
I will need to contact my friend with the scope and will report back in the next few days.

Thanks again for all the help!

[ Diese Nachricht wurde geändert von: trybefore am  5 Okt 2014 16:29 ]

In order to replace the capstan belt you need to remove a metal plate with a hole in the centre, through which a shaft is visible. This plate needs to be centred around the shaft using a tube with (don't quote me on this, it's from memory) 4 mm interior and 6 mm exterior diametre. The other side of this plate has a special pattern of meandering lines that is used to generate a reference signal. If the plate is off centre there will be severe tracking problems.

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"Und dann kommen's zu ana Tür da steht oben "Eintritt verboten!" und da miaßn's eine!"

Thanks.
What frequency and amplitude should I set on the oscilloscope?

Hi, and sorry for my late response.
I will take a look into the service manual today or tomorrow. I don't know the parameters for the oscilloscope for checking the DTF voltage.

Thanks for your patience!

Best regards,
stego

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Hello again!

I have the whole service manual as PDF-file on my computer, unfortunately only in german language. Tell me, if you want it, then I will upload it somewhere, and I tell you the download link.
Sending with e-mail is perhaps not possible, because < 100 MB.

Best regards,
stego

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Offtopic :

@stego: Is the whole pdf file < 100 MB or > 100 MB ? No possibility to shrink it (as zip or other)?

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[x] <= Hier Nagel einschlagen für neuen Monitor!

Offtopic :

@Tom: Die PDF-Datei hat ca. 108 MB. ZIP-komprimieren bringt nix, hätt ich schon probiert. Als PDF = 108,4 MB, als ZIP = 108,4 MB. In english: This PDF file has a total size of approx. 108 MB. Compressing to zip is for nothing, because PDF = 108,4 MB and ZIP = also 108,4 MB.

Gruß / regards,
stego

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Sorry for the long delay. I damaged my right knee.
Now I have been able to download the 100+MB manual and have a "vintage" but very nice Normende SO3312 Oszilloskop on loan with the Bedienungsmanual.

Basically ready for the next stage. What probes do I connect to where and what settings do I need on the 'scope?

It would be a shame to mess up both pieces of equipment through a bad connection.

Well, sorry too for my delay, I didn't read your posting.

Tomorrow I will upload the complete service manual for the V-2000 on a webserver and I tell you the address for downloading then.

Please wait until tomorrow, thanks!

Best regards,
stego

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Hello,

now I have uploaded the file on a webserver:

Servicemanual Grundig 2x4

Please download it from this address, I will delete it after your download.

Best regards,
stego

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Thanks Stego - got it. If you can tell me which page, paragraph etc and where to connect the scope, that would be really great.

Hello,

take a look into the servicemanual. In the "mechanical part" (Mechanischer Teil) the procedure is shown, because after mechanical adjust the DTF-voltage must be checked.
The Oscilloscope is connected on the two sliders on top of the head drum.

Best regards,
stego

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