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Old 7th Nov 2017, 7:03 pm   #8
DrBagPhD
Retired Dormant Member
 
Join Date: Nov 2017
Location: Glasgow, Scotland, UK.
Posts: 7
Default Re: Converted GPO 332 (mk1) receiver EXTREMELY quiet, help!

Apologies for double posting but I had a bit of spare time so was able to try adjusting the off-normal contacts. They were indeed both closed. Adjusting has, however, brought an odd issue to light.

I've attached an image for reference, as I'll be calling the outer contact A, and the inner contact B. It's worth noting that the microphone doesn't appear to work with any configuration of the contacts.


When both A & B are closed, the telephone acts as described above.

When only A is open, sound is heard loud and clear through the receiver.

When only B is open, the telephone will not answer a call when the handset is taken off the hook. Instead, a sort of buzz-buzz (as opposed to ring-ring) is heard coming from the receiver.

When both A & B are open, the result is the same as when only B is open, but there is also a faint white noise coming from the receiver instead of no dial tone at all.
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