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missing BG4000

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Craig
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Craig posted on Tue, Oct 19 2021 11:56 AM

Following a protracted delivery process Justin was finally able to get this to me, seems it had fallen off DHL's radar a week or so ago and we feared the worst........


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Craig
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component side....


Craig
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set my variac to 10vac..............


Craig
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looks good to me, I'll keep this in the box of miscellaneous spare parts Smile 


Craig
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Control panel switch contacts look quite tarnished.........need to remove them and clean them up


Craig
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Of course the F and FF switch contact needs both the saddle and the leaf spring removing to get at the stud underneath....


Craig
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Craig replied on Sun, Nov 14 2021 10:02 AM

Just as an aside......Justin is still pursuing a transformer for this unit, I believe he's received one quote and is waiting for a second, I know this is a long shot but does anyone out there have a 240vac transformer going begging Whistle

Craig
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Craig replied on Wed, Nov 17 2021 8:38 AM

Craig:

I've just had an epiphany, or as some may say "a lightbulb moment" regarding the strobe lamp.....can anyone come up with a reason why I cannot connect across the 240vac incoming supply fuses through the reed relay and then into the strobe lamp? I seem to recall something about back EMF generated when disconnecting a coil i.e. an ignition coil on a car engine....could this be an issue bearing in mind the reed relay would open when the set is switched off?.........any thoughts would be welcome Wink 

well....so much for that bright idea, tried it out and it didn't work......when I connected the neon lamp to the incoming fuses I found that the voltage dropped to around 106vac when the transformer was powered up, well below what's required for the neon lamp. I tried measuring the voltage at the fuses on a working unit and found the same reading........could a faulty bridge rectifier be responsible for this loss of 240vac on the secondary side (Martin.....I'm looking at you) Wink

Craig
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Ok.....took some resistance measurements of the 240v secondary windings of a working machine....1.3kohm


Craig
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Now the problematic transformer readings..........0.9 kohm, quite a difference in winding resistance


Craig
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Craig replied on Fri, Nov 19 2021 8:24 AM

So....I'm not sure how transformer calcs go, however...the voltage out of my working machine measured at the neon lamp terminals = 230vac, the voltage coming out of the suspect transformer = 165vac (approx 28% difference)

The secondary 240vac windings resistance of the working machine = 1.3k, the winding resistance of the suspect transformer = .9k (approx 30% difference)

looks like the figures tie up......

 

 

 

Craig
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Moving on with the control panel switch clean up.....almost there.


Craig
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Well......in anticipation of sending the transformer off for a rewind I removed the item, however.....and there is always an "however" the company who originally quoted the job decided against it when they where pressed for a delivery address, Justin is distraught......


Craig
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This is the offending item..........as it is now out in the open I decided to do some more measurements to see how it shapes up, I made the assumption that the primary winding Green/Black/yellow wires, that are all bundled together in the same yellow sleeve where connected to terminals 8 3 and 1 of the voltage selector switch respectively, while the remaining primary white/red wires, also bundled together in a yellow sleeve, where connected to terminals 2 and 4. 


Craig
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Based on that assumption I roughly sketched this out........but when I started to measure up the resistances it didn't pan out. The green wire, connected to terminal 8 of the selector switch, was open circuit with both the black and yellow wires with which it shares a yellow sheath? The yellow and black wires measured 44.5 ohms.....the red and white wires connected to selector switch terminals 2 and 4 respectively measured 44.4 ohms.

This made no sense to me as the transformer would never power up.....as can be seen if the green wire is open circuit to both black and yellow we are going nowhere......and I know this isnt the case. (click on image below.....poor drawing I know) Surprise


sonavor
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When I started out on my BG4000 (with the bad transformer) I was excited at first because I found a transformer repair shop that said they could fix the windings.
Once they received the BG4000 transformer they sent it right back and said they couldn't repair it because the windings are epoxied together.

That's when I went the route of having the Toroid company design me one.  That worked out okay in the end but I didn't realize at the time that I would need the 220V for the neon strobe.  If I were to do it over I would have had them include a secondary for that 220V.  However, I am also happy with my 10V powered LED strobe substitute.

John

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