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WayneL74 · 17th May 2020, 8:00 pm

Hi Sparks.

There is something not quite rights here.

You said there was no continuity from T3 to T19, but since then we have proved there shoud be as we have tested each stage one by one.

Can you try the following with the regulator in upside down & the switchhooks up:

Hold 1 probe on T3. Hold the other probe on regulator contact B, then move it to regulator contact C, then to ASTIC pin 5, then to ASTIC pin 4, then to T19.

You should get continuity all the way, with the resistance increasing as it goes.

17th May 2020, 8:00 pm	#38
WayneL74 Triode Join Date: Jun 2015 Location: Ipswich, Suffolk, UK. Posts: 49	Re: Quiet or no dial tone in a GPO 706 Hi Sparks. There is something not quite rights here. You said there was no continuity from T3 to T19, but since then we have proved there shoud be as we have tested each stage one by one. Can you try the following with the regulator in upside down & the switchhooks up: Hold 1 probe on T3. Hold the other probe on regulator contact B, then move it to regulator contact C, then to ASTIC pin 5, then to ASTIC pin 4, then to T19. You should get continuity all the way, with the resistance increasing as it goes.