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QSD3A Question

Started by bbuswell, October 20, 2021, 07:56:43 AM

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bbuswell

Greetings,

I recently bought a QSD3A post pay phone off eBay and I cannot get it to work.  I have a working 685A subset wired up as indicated in the directions posted on the web but I cannot get dial tone to the handset.  I'm wondering if my issue is the coin switch has been removed and I need to jumper a connection on the relay to get it to work.  Attached are some pictures of what I have.  I get dial tone on my test set if I connect to TR and Y on the contact switches but I can't get any further.  Any help would be greatly appreciated.

Best,
Brett

FABphones

A collector of  'Monochrome Phones with Sepia Tones'   ...and a Duck!
***********
Vintage Phones - 10% man made, 90% Tribble
*************

Stan S

Assuming the coin switch has been removed and nothing else is wrong with the payphone try putting a jumper between SL and BKX on the transfer contact assembly.

bbuswell

Quote from: FABphones on October 20, 2021, 10:15:47 AM
A few QSD3A restoration threads:
http://www.classicrotaryphones.com/forum/index.php?topic=11331
http://www.classicrotaryphones.com/forum/index.php?topic=8856
http://www.classicrotaryphones.com/forum/index.php?topic=8416

And
http://www.islandregister.com/phones/qsd3a.html

Also, QSD3A/NE685A wiring diagram attached blow.

:)

Thanks for the links.  I double checked my wiring several times and it still doesn't work.  :'(

Quote from: Stan S on October 20, 2021, 03:31:20 PM
Assuming the coin switch has been removed and nothing else is wrong with the payphone try putting a jumper between SL and BKX on the transfer contact assembly.

I was hoping that was the simple fix I needed Stan but I still can't get any dial tone.  Is there anyway to test the relay or the handset?

Thanks,
Brett

Stan S

Simple wavy to test the handset is connect one side of the mic to one side of the earpiece then hook the remaining side of each to a standard 9V battery. Speak into the mic you should hear yourself in the earpiece.

Stan S

Correction. Simple way. Fat fingers small iPad.