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TonyDuell · 6th Jun 2019, 4:48 pm

Did you read my last comment?

There is a diode in parallel with the relay coil in the ringing converter. Desolder it and check it. If it is open-circuit then the relay will not respond to the AC ringing signal I think.

Diagram N626 is the one for the ringing converter. The diode is D1 on the circuit diagram. It says the relay coil should be 400 ohms, but you wouldn't pick up a few shorted turns like that (not that I think that is the problem). It's a special 'slugged' relay so you would have problems getting a replacement...

6th Jun 2019, 4:48 pm	#20
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: GPO planset with external extensions Did you read my last comment? There is a diode in parallel with the relay coil in the ringing converter. Desolder it and check it. If it is open-circuit then the relay will not respond to the AC ringing signal I think. Diagram N626 is the one for the ringing converter. The diode is D1 on the circuit diagram. It says the relay coil should be 400 ohms, but you wouldn't pick up a few shorted turns like that (not that I think that is the problem). It's a special 'slugged' relay so you would have problems getting a replacement...