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irishron40
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Joined: 22/09/2014
Location: Ireland
Posts: 251

Posted: 03:00pm 26 Jan 2016

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hello, I have one of these transformers from an old jvc video recorder,

would anyone know where i can get a wiring diagram? have searched the web

thx

ron

Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 01:14am 27 Jan 2016

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You have one of what????
other than knowing you have a transformer we have nothing to go on.

Sometimes it just works

irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 251

Posted: 01:55am 27 Jan 2016

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sorry model was posted in topic downwind.

jvc C39001-B Power Transformer

thx

Pete Locke
Senior Member

Joined: 26/06/2013
Location: New Zealand
Posts: 181

Posted: 08:12pm 27 Jan 2016

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A multimeter should get you the secondary terminals. Then you power it up and measure secondary voltages. You can eye ball the secondary windings to get an idea of what they will deliver current wise. Typically old VCR transformers are about the 100Va mark with (depending on the machine) a 3volt winding for the fluro display, about 7 volts for the 5v logic side of things, 12v for the motors, and 40...ish for the capstan/head motor. These are numbers I've dragged out of the dusty part of the brain from the 80's when I used to repair the damn things. Great source of cogs and the like for other projects, although they are getting hard to find. Much like the old F&P Gentle Annie washing machines whose bowls made perfect braziers

Edited by Pete Locke 2016-01-29

irishron40
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Joined: 22/09/2014
Location: Ireland
Posts: 251

Posted: 07:37am 28 Jan 2016

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thx pete. i wasnt able to get windings out of the metal housing. so i wasnt sure which 2 are main supply

thx ron

Pete Locke
Senior Member

Joined: 26/06/2013
Location: New Zealand
Posts: 181

Posted: 12:19am 29 Jan 2016

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.....Only two windings? that is, 4 terminals on the transformer...? out of an early model VCR...? Put it in a glass case. It's worth MILLIONS

They never made one for that purpose.
The transformer (if I remember right, you are fairly new to the electrickery field) could have multiple primary taps for various world wide voltages, and more than likely multiple taps for the secondary supply. If you have the model number of the VCR it came from, Google that. Don't forget to put 'Service Manual' after the model number. You might be supprised that there is a 10Gb four hundred and thirty twelve page manual free to a good home

But somewhere about page eleven twenty seventeen will be a picture (well circuit diagram) of the power supply. In my day, it was all on hard copy and the workshop used to list to port with the weight on the shelf of all those service manuals. The poor trees that must have died in the production of the things

.
But. If you indeed only have 4 terminals to choose from, and there is no connection between the two sets, and is indeed out of a video recorder, and it's not a step up transformer, then the primary winding (the one you stick the main into) will be the higher resistance one. If in doubt, wire a 230v 25....ish watt lamp in series with what you think is the primary. It will tell you more than what a fuse will, and it will keep the smoke in. Good luck

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