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Old 18th May 2020, 10:38 am   #54
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
Default Re: Quiet or no dial tone in a GPO 706

It sounds as though the two green wires have indeed been transposed. Try swapping them over and see what effect that has.

One side of that double capacitor (1.8μF) should go between T9 and T7, while the other (0.9μF) should go between T10 and one end of R2. I have confirmed this to be the case by looking at the innards of a 706 I have. None of the capacitor's connections should go to T19. That side of the gravity switch should go between T19 and the induction coil.
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