[Jukebox-list] Amp meter was Wurlitzer 2410S problem

[Don]

Hi Joey,

Thanks for the tips. I'll add'em to my arsenal.
Didn't know about the inductive volt tracers 'til you told me. Sounds great.

There were some assumptions I made in suggesting the ammeter trick in 
circuit. I guess the main assumption being that there is a faulty, partially 
shorted coil and if left powered on for some much longer time than normal it 
will start to smell, apart from not doing its job properly.   So because it 
is a partial short it should not take out the meter's fuse or damage the 
ammeter as long as the amp range setting is well above the expected current 
draw.

What I liked about the meter idea is that you can easily note the current 
draw in the circuit legs that work fine and when you hit the partial shorted 
leg it should be obvious by its somewhat large current draw.

That said Steve's smell problem might be coming from something else.....

Until the reason for the smell is found and fixed, there exists the 
potential for a fire.
So let's wish Steve well on his hunt for the problem.
Don


----- Original Message ----- 
From: "Joey McDonald" <joe400f at shaw.ca>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Friday, May 25, 2007 5:36 PM
Subject: Re: [Jukebox-list] Amp meter was Wurlitzer 2410S problem


> Any multimeter that is capable of measuring amps should be fused internal.
>
> I use a Fluke 189 meter that is fused 20 amps.
> I always test the ckt for shorts with a fused 15amp  jumper first
> before hooking up the meter. This saves $$$ in fuses.
> Fluke meter fuses can get expensive.
> I was listening in on this disussion when I thought I would add my 2 cents 
> worth.
>
> I spend a lot of time tracing ckts for shorts.
> I am GM tech and do electrical repairs all day long.
> You would be amazed at the source for shorts
> that I find everyday.
> The multimeter should be used to measure current draw
> not to find shorts. There is no need to measure current draw
> on a shorted ckt. Repair the short then measure current draw
> to see if it is within spec.
>
> The lamp idea is an old tried and true way to find a short.
> Also using a ckt breaker is a cheap tool and works well.
> If a ckt has many branches that run off 1 fuse, isolate ckts
> by adding fuses to each branch. Then trace the isolated ckt for the source
> of the short. Leave the extra installed fuses in place. They will
> only help in future diagnosis if needed.
>
> There is also many inductive volt tracers now that can be bought for 
> arounbd $25. Guide it along the ckt and when
> the lite stops flashing or changes colour is where the voltage stops.
> BINGO. You found the short.
>
> Finding a shorted ckt should not be too hard to diagnose.
> Finding intermittent shorts requires the thinking cap.
>
> Hope this ramble helps someone.
>
> Joey McDonald
>
>
>
>
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