UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

TonyDuell · 7th Jun 2019, 4:41 pm

A couple of quick things to do.

1) Test one of you new 1N4002 diodes to make sure it appears to conduct one way only. This will verify you can test diodes with your meter.

2) Now test the 1N4002 you fitted to the rigning converter. Does it still test good? It's possible there's a fault that is burning the diode out.

I beleve you can get the relay in the ringing converter to operate by the buttons on the extensions. Connect your multimeter (DC volts range) between terminals 4 and 5 of the ringing converter (those numbers are the terminal numbers in the ringing converter), +ve lead to terminal 5. 'Buzz' from an extension and check the meter reads normally (should be about 9-12V). If it reads backwards then you have a wiring fault which could damage said diode.

Make sure the diode is fitted with the banded end connected to terminal 5 in the ringing converter.

7th Jun 2019, 4:41 pm	#26
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,224	Re: GPO planset with external extensions A couple of quick things to do. 1) Test one of you new 1N4002 diodes to make sure it appears to conduct one way only. This will verify you can test diodes with your meter. 2) Now test the 1N4002 you fitted to the rigning converter. Does it still test good? It's possible there's a fault that is burning the diode out. I beleve you can get the relay in the ringing converter to operate by the buttons on the extensions. Connect your multimeter (DC volts range) between terminals 4 and 5 of the ringing converter (those numbers are the terminal numbers in the ringing converter), +ve lead to terminal 5. 'Buzz' from an extension and check the meter reads normally (should be about 9-12V). If it reads backwards then you have a wiring fault which could damage said diode. Make sure the diode is fitted with the banded end connected to terminal 5 in the ringing converter.