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Old 7th Feb 2023, 3:37 pm   #21
russell_w_b
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Location: Penrith, Cumbria, UK.
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Default Re: Vintage 706L not ringing

Quote:
Originally Posted by Daisy May View Post
I have an old multimeter (ie not digital ) and can use it under instruction. Ive already tested ohms to show that ringer is good. What next?
Set your multimeter to measure a.c. Volts, then measure across Terminals T4 and T16 when the telephone is meant to be ringing - with the handset 'on-hook'. You're looking for about 75V across these terminals, to which your bell is connected. An analogue multimeter like yours is probably better than a digital one under the circumstances, as the ringing cadence is only 400ms on, 200ms off, then 400ms on again (repeated until answered), so watch for a peak on your meter pointer.

If you get about 75V a.c. here, then your problem is between these terminals and the bell coils.

If you measure no voltage here, it's possibly a break in the capacitor track on the PCB.
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