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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions. |
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27th Jul 2018, 2:09 am | #1 |
Hexode
Join Date: Oct 2017
Location: Manchester, UK.
Posts: 363
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Aurora fault.
I suppose this might belong in modern tech section, the Aurora converter I have had for about 10 years has developed a fault, it works fine on the modulator output which I use most of the time. I used to use the video out to make recordings on a VCR and if I wanted to feed a TV with baseband video. The video out is now at a very low level and is no longer usable. Has anyone else experienced this? Does anybody mend these at all in England.
Graham. |
27th Jul 2018, 7:14 am | #2 |
Retired Dormant Member
Join Date: Jan 2018
Location: Chamalières, France.
Posts: 167
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Re: Aurora fault.
I'm sure Darryl will be able to fix that!
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27th Jul 2018, 7:38 am | #3 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: Aurora fault.
I would have thought the modulators and standards converters section.
Incidentally, if it's just the baseband output that's affected, I would have thought the problem must be pretty local to that, as there can't be much circuitry between that output and the signal going into the modulator.
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27th Jul 2018, 2:37 pm | #4 |
Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,533
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Re: Aurora fault.
I take it the relevant phono plug and lead are beyond reproach? Could there now be a bad connection at the Aurora's phono socket due to stresses from heavy use? Does gentle manipulation at the socket make any difference?
Steve
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27th Jul 2018, 2:42 pm | #5 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Aurora fault.
I have seen very bad video caused by a missing terminating resistor at the input end of the cable.
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28th Jul 2018, 12:16 pm | #6 |
Retired Dormant Member
Join Date: Jan 2018
Location: Chamalières, France.
Posts: 167
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Re: Aurora fault.
I have experienced that with a new RCA RF modulator, chinese made. Some soldering to fix inside.
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28th Jul 2018, 8:32 pm | #7 |
Hexode
Join Date: Oct 2017
Location: Manchester, UK.
Posts: 363
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Re: Aurora fault.
I Have had a look inside the aurora, the phono socket is ok and no soldering issues found. I dont want to risk making anything worse as the rf out is fine and I only used the video output occasionally.
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31st Jul 2018, 4:07 pm | #8 |
Hexode
Join Date: Jul 2004
Location: Michigan USA
Posts: 325
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Re: Aurora fault.
Just to chime in:
If the modulated output is working properly than the line level driver must be in working order as that's what's used to drive the modulator. There is a 75 ohm terminating resistor in series with the jack that could conceivably be bad. It would be worth a check. If it checks out good as does the jack, then possibly the cabling or device it's connected to is presenting the fault. Darryl
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Aurora video standards converters: http://www.tech-retro.com/Aurora_Design/Video_Home.html |
1st Aug 2018, 4:17 am | #9 |
Hexode
Join Date: Oct 2017
Location: Manchester, UK.
Posts: 363
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Re: Aurora fault.
Hi Can I ask is the resistor in question a smd type,I think it must be as when I had a look I didnt see any conventional types,also are there any precautions as to static?. Graham.
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1st Aug 2018, 11:48 pm | #10 |
Hexode
Join Date: Jul 2004
Location: Michigan USA
Posts: 325
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Re: Aurora fault.
Graham,
Yes it's a surface mount device. It will be right along side the connector, closest to the back edge of the board. It may be marked 75- something. You do need to follow standard static procedures like grounding yourself before opening the case and working on the board. You should be able to easily check the resistor with a meter. Darryl
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Aurora video standards converters: http://www.tech-retro.com/Aurora_Design/Video_Home.html |
2nd Aug 2018, 11:48 am | #11 |
Heptode
Join Date: Aug 2009
Location: Carshalton, Surrey, UK.
Posts: 734
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Re: Aurora fault.
Hi.
Just a quick question. Would it be possible to measure the resistance ( from the phono socket ) to see if the 75R resistor has gone faulty? I'm assuming that if there was a bad connection then the video output would be a lot, lot greater than 75R. But of course even if the connections were OK the resistance measurement would be above 75R due to the other components. I think ( but may be wrong ) this would need to be done with a digital meter and probably with the unit powered down to avoid the possibility of damaging the circuitry?
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Regards Peter B |
2nd Aug 2018, 12:44 pm | #12 | |
Dekatron
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
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Re: Aurora fault.
Quote:
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