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Umatic vo5630

 
acj1980
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I have one in my collection, and get it for about 10 years ago on the recycling station, i used it a lot and then put it on stock, now it's time to play with it again, it plays very great and have a fine picture and sound, but when i record something the sound is missing i both channels, if i turn the volume to max on the vcr it register some distorted sound and the VU metres is moving, does anyone have an idea what the issues is? 

 

Alex

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Topic starter Posted : 29/10/2019 9:36 pm
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acj1980
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is there anyone who had experience with those machines? i would like to hear further 🙂 

Alex

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Topic starter Posted : 31/10/2019 12:49 pm
Nuvistor
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Never worked on or sold them Alex, I used a UMatic machine on a training course nearly 40 years ago but that is about it. 
If the audio is recorded like many VCR machines on its own analog track then check the bias oscillator.

 

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Posted : 31/10/2019 1:34 pm
mfd70
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@acj1980

Put a finger or screwdriver on to the terminals of the audio/control head, if you hear sound then there may be an tape alignment (unlikely) or threading issue (more likely if the machine has not been used) if there is no sound then it's an audio signal path issue. I'm not familiar with this model but most have a variety of balanced and unbalanced outputs on various connectors XLR,phono and EIAJ. It's worth checking them all, also the 600Ω term switch if fitted, these would give audio problems on the Betacam decks.

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Posted : 31/10/2019 10:22 pm
acj1980
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@mfd70

hi.

in playmode there is fine sound, the issues is only in record mode, im sure that the bias oscillatoer is running, but why no clear sound is on the tape? i want to check it out in the weekend 🙂 

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Topic starter Posted : 31/10/2019 10:28 pm
Nuvistor
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The bias oscillator will be used for record only that’s why I suggested it. One fault if the bias osc is not running is low distorted sound on recordings but ok on playback of good tapes, but if it’s running that’s ok. 

If you have a scope trace audio path on record, hopefully you have a circuit to help trace it through.

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Posted : 31/10/2019 10:42 pm
Cathovisor
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Posted by: @mfd70

It's worth checking them all, also the 600Ω term switch if fitted, these would give audio problems on the Betacam decks.

I'd hope nobody in this day and age is still using those termination switches... 

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Posted : 01/11/2019 12:59 am