ESX100 Problems

[jukenorman]

Hi Paul,

Checking at test point B is electrically the same as checking across the detent switch with your neon. Maybe you have bad solder joints at the detent switch that you are disturbing when you connect there?

Update - I cannot really see any other reason for your problems here other than the detent switch - you have the source voltage (2% or so, low), you've changed any component that could be suspected as a potential problem and as far as I can tell, you've shown that you don't have a short to ground.  The only other possibliity is very poor contacts on the reversing switch and both the A and B side contacts would need to be bad (and you have shown that they can pass voltage).

One thing to be aware of, the neon lamp will rob energy when you have it in circuit  in which case the tormat toroids will not flip, it's purely for daignostics.

Norman.

[paullperth]

Hi Norman,

I have spent a couple of hours checking and double-checking your guidance. I have 385v across the detent switch. If I place a piece of card across the tormat contacts the voltage disappears in both directions.

I have checked for any breaks in the wiring from the tormat contact switches back to the SCC. I haven’t identified any issues.

I am totally stumped to be honest. There is probably something glaringly obvious that I’ve missed. This is my first jukebox so there is lots I don’t know, but I am just not getting anywhere, in fact I am going backwards despite your excellent help!! It has to be operator error.

I can’t see why I am now not getting any voltage variation at SCC terminals 2/3 when I am getting it at the detent switch. I’ve traced the wiring through from tge contacts to the detent, from detent to cam switch and from there to the orange plug and internally on the SCC. Everything checks out in terms of a continuity “beep test”. The read out variation at terminals 2/3 was there before, why not now?

It might be time to put this aside until my eyes are fresher. Right now I am so sick of looking at the same wiring and components that I am likely not seeing something simple.

Paul

[jukenorman]

Hi Paul,
One thing that we must not lose sight of is that the fault may not be in the above circuit and that it's in the "sensing and trip circuit". If the battery test doesn't work, there could be a fault in either the "read" or "sense and trip" circuits. We had been concentrating on the read circuits first.

Pretty much everything you've done above on the read circuit shows no problem. My only concern was why, when you connect the neon lamp at the test point, you see no flashes. However I would argue that the tests that had been done prior to that were more comprehensive. For example, we checked the actual ground circuit used in the read circuit as opposed to the general ground you used for the test point check.

Maybe it's time to look at the sense and trip circuit?


Norman.