Seeburg 3WA Wallbox

[Ron Rich]

Hi Gordon,
"Earth" is supposed to be switched, on to that relay at the proper time-- Use the test lamp to find the "open"-- Ron Rich

[jukenorman]

Hi Gordon,
You're closing in on the problem. RA is connected to RB only on the earth side (ie RA and RB both switch earth) so you have proved that the earth is present. Using the test lamp and with power off, connect one side to earth and the other side to the switched contact of RA. Manually operate the letter step relay, if the light doesn't illuminate, the RA contact is poor. If the light does come on there are two other possibilities - the plug/socket contact is poor or there's a broken wire somewhere between RA and the transfer relay coil.

Norman.

[gordo]

Hi Ron and Norman,

I have made some progress!
I found a broken trace hidden behind the R506 resistor.
Now, both the DC Relay and Transfer Relay work.

When I first connected everything together, I made a selection on the wallbox and the letter stepper stepped, then the number stepper stepped.
All looked promising.

However, this only lasted a couple of selections.
Now the letter stepper only steps twice and jams up. It stays jammed even with the power off.
The DC relay, Transfer Relay and Reset Magnet remain energised (until I power off) as the letter stepper is jammed closed.
I need to physically move the letter stepper off after the power is off.

I have looked for anything that may be binding it, but no luck.
I have also adjusted the pawl travel, no change.
I also adjusted the Letter switch cam, no change.

This is getting close to working, just a few more hurdles, I feel.

Thanks for your advice.
Cheers Gordon..

[jukenorman]

Hi Gordon,
That's good progress though. Sounds like a mechanical issue with the letter stepper, probably requires dismantling?

Norman.

[gordo]

Hi Ron and Norman,

I think I have (again) burnt out the 2050 tube.
It no longer works when I put it into the TEU-1.
No selections can be made. I hope I have not damaged anything else.
I need to wait for my shipping from the US to replace the 2050 tube.

So, this stepper has beat me.
I don't believe that I can get it working, so, I'm giving up and making it an expensive ornament.

It has taken far too much of your time. Thanks for that time and advice.

I will let you know if a new 2050 gets my selector working again (if not, I may seek your assistance again).

Regards
Gordon....

[gordo]

Hi,
Some more bad news.

I can smell a slight burning smell and my Power Transformer T751 is slightly warm.
Could i have burnt out the transformer?

I guess to check the transformer I need to measure each lead (with power on) back to earth?
Is this correct?

Cheers
Gordon...

[Ron Rich]

Hi Gordo,
WHUT didja do ?? Make sure you have a 5 amp fuse in the phono-- and allow it to run-- watching (touching) the transformer- yep- if "hot"-- it's gone   Ron Rich

[gordo]

Hi Ron,

Yes, it gets warm, and I can smell something burning.
It has been missing selections for a while now. Often taking twice (or more) to select.

Is my method of checking the windings correct?

If I do need one, fortunately I have found one in Australia. Expensive though!

Cheers
Gordon

[Ron Rich]

Hi Gordon,
From what you are writing-- the transformer is OK-- They are normally "warm" to the touch-- should run 24/7 warm, to "hot"-- just under finger burning temp after 24 or more straight. No Do NOT "check", the transformer that way-- just run it--
As for missing selections -- describe this in better detail-- are you saying you have checked the Read-out sense/detent loop" using the "battery trick" and -- what has been discovered ?? What size/type fuse is being used in that TSR ? Ron

[gordo]

Ron,

You have raised my hopes, I am looking at about $300-$400 (AUD) to replace the transformer.

I intend to wait until my new 2050's arrive, then I will install them and respond to you.

Thanks
Cheers
Gordon..

[Ron Rich]

Hi Gordon,
OK- No problem-- meanwhile, I would strongly suggest you add fusing as shown in the sticky above. Ron Rich

[jukenorman]

Hi Gordon,
I realise how frustrating the 2050 failures must be for you! I wonder if your latest issue with the letter stepper sticking is actually being caused by the faulty 2050? After your 2050s arrive and you get your jukebox back up and running, you might think of returning to the stepper. What I think you should consider doing though, is replacing the stepper 2050 with an SCR (thyristor). You should have no trouble sourcing suitable SCRs locally and they are cheap (I checked your ebay, $2.95). If you do decide to proceed, we can give you guidance.

Norman.

[gordo]

Hi Ron and Norman.

Once my new valves arrive I will work through the extra fusing and perhaps your Thyristor upgrade
(I just have to consider my very limited electronics knowledge)
however, shipping is sometimes very slow at present and could still be a few weeks to go.

I am also hopeing the problem is the 2050. I am concerned why 2 burnt out on me?

Gordon..

[Ron Rich]

Hi Gordon,
What makes you think that both 2050's "burnt out" ? IF, they are the "coke bottle" style envelops, look straight down the top of them-- is the glass clear or black ? Ron Rich

[gordo]

Hi Ron,

Neither are the 'coke bottle' style and the glass is relatively clear.

My KD200 stepper unit did not have a 2050 so I 'borrowed' one from my Seeburg C stepper (it was almost new) while I worked on the KD200 stepper.

When my KD200 stepper stopped stepping, I checked the 2050 by putting it back into the Seeburg C, it didn't work anymore.
I assumed it was burnt out.

So, I borrowed the 2050 from the KD200 Tormat Unit (TEU1) putting it into the Stepper Unit (RCSU1), the stepper worked for a while as I worked on it.
I was obviously unable to make any selections at this stage.

After a bit more work on the stepper, the stepper unit again stopped stepping, so, I moved the 2050 back to the Tormat Unit to test it.
No selections can be made.
Again, I assumed I had burnt out a second 2050.

I have no more 2050's to try until my shipping from the US arrives.

Regards
Gordon...