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Stromberg Carlson 500-D Ringer Adjustment

Started by fvox13, March 21, 2016, 09:10:20 AM

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fvox13

Picked up a Stromberg Carlson 500-D at a garage sale for $4, on a lark, and I've wired it into my office phone system as another phone on my extension (gotta love PBXes that have FXS ports!) (http://www.allworx.com/products/business-phone-systems/allworx-48x-business-phone-system)

Everything's working, except the ringer... but I don't think it's a wiring problem, because I can get it to ring when it's "slightly off hook".  In other words, if the hook is all the way down, it won't ring, but if I pick the hook up slightly (but not enough to go off-hook) it will ring beautifully.

Per the wiring diagram (http://ssecdn.net/phones/S-C%20500D%20and%20554B%20Telephone%20Wiring%20Diagram.pdf) the ringer is wired as "Individual or Bridged" (L2,L1,K,A).

I tried moving the bias spring rod thingy (technical term...) over to the far right position, and now the phone will go "ting" very faintly when it rings... but I can't move it over any further.

Short of "shimming" the hook somehow so it doesn't go down all the way, what else can I adjust?

unbeldi

#1
Welcome!

hmm....
I would say examine once again your hookswitch wiring, make sure the right colors go to the right places. And check the mechanics to make sure the contacts haven't been bent.  The hood over the contacts can usually be removed.
The tel set appears to be shunting the ringer when on-hook.  One of the switches is a break-make switch, perhaps it somehow engages the wrong connections.

By your description the ringer is wired correctly.

Southernphoneman

Quote from: fvox13 on March 21, 2016, 09:10:20 AM
Picked up a Stromberg Carlson 500-D at a garage sale for $4, on a lark, and I've wired it into my office phone system as another phone on my extension (gotta love PBXes that have FXS ports!) (http://www.allworx.com/products/business-phone-systems/allworx-48x-business-phone-system)

Everything's working, except the ringer... but I don't think it's a wiring problem, because I can get it to ring when it's "slightly off hook".  In other words, if the hook is all the way down, it won't ring, but if I pick the hook up slightly (but not enough to go off-hook) it will ring beautifully.

Per the wiring diagram (http://ssecdn.net/phones/S-C%20500D%20and%20554B%20Telephone%20Wiring%20Diagram.pdf) the ringer is wired as "Individual or Bridged" (L2,L1,K,A).

I tried moving the bias spring rod thingy (technical term...) over to the far right position, and now the phone will go "ting" very faintly when it rings... but I can't move it over any further.

Short of "shimming" the hook somehow so it doesn't go down all the way, what else can I adjust?
If you can, post a photo of the inside, maybe one of us can pick something up by eye that hasn't been spotted.

fvox13

Hi, All!

Here's a few photos, including the wiring block, and the contacts on-hook, off-hook, and during a successful ring. Appears to be a contact that is engaged during a ring this "inbetween" phase that is not engaged when on-hook...

This PBX purports to provide full standards-compliant analog FXS lines with up to 5.0 REN on each port. 

Since my first post, all of the taking-the-cover-off-and-back-on appears to have done... something, since I get a full ring (albeit very quiet) rather than just a "ting".  The "LOUD" wheel is all the way in the "LOUD" position.

Thanks!

unbeldi

#4
Are you sure you don't have on-hook and off-hook mixed up in your image names?


The switch position that you label off_hook.JPG  should be the on-hook state, when the handset is in the cradle.


In this image I have marked the spring designations and the movement when lifting the handset:

poplar1

#5
There should be only one wire on terminal "A." You have two. Apparently one of them is the slate (gray) hookswitch wire, which normally would be with the slate-yellow hookswitch wire, which is already on L2.

The shanks of the spade tips sbould be dressed so that they don't touch adjacent terminals. It appears that F and  K wires may be touching.

Ringer wires:

Black. To L1
Red to L2
Slate to K
Slate-red to A

By having the gray hookswitch wire on A, you are incorrectly shorting L2 to the ringer circuit.
"C'est pas une restauration, c'est une rénovation."--François Martin.

unbeldi

#6
You also appear to have two wires on the A terminal ?



See here for wiring ringers of all of these types of telephones:  http://www.classicrotaryphones.com/forum/index.php?topic=15870.0

poplar1

The slate hookswitch wire serves no purpose except on certain party lines, or with speakerphones. It is normally closed to slate-yellow when the phone is hung up. When the slate wire is on L2, along with the slate-yellow, it has no effect on the circuit --- unless it is inadvertently moved to another terminal, such as has been done in the photos.

Connecting it to L1, for example, would place a short across L1 and L2 whenever the phone is hung up.

So the slate hookswitch may be placed on L2 (per the diagram for non-party lines), or taped and stored, but it should not be connected to A, K, L1,etc.
"C'est pas une restauration, c'est une rénovation."--François Martin.

fvox13

Got it working!  It was indeed the extra slate wire on "A"... I wonder why the previous owner had it wired that way? Or, maybe they thought it was broken and that's why it was $4?

And yes, unbeldi, I did have the captions reversed... got confused when I renamed them!

This is a really cool moment for me, plugging a made-in-Rochester phone into a designed-in-Rochester PBX, in my Rochester-based company :-)

Thanks!

Here it is in action:  https://youtu.be/5zCJMeMaZqg