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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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17th Sep 2021, 11:16 am | #1 |
Pentode
Join Date: Mar 2012
Location: Rotherham, South Yorkshire, UK.
Posts: 152
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Broken 746 telephone
My father in law has dropped his 746 telephone.
Now, it sits and hisses and crackles and gives feedback through the receiver even when the phone is on cradle. It does sort of work, although ringing on incoming calls is now a bit stop-start and struggles to get going, only really properly ringing a good 6 seconds or so into an incoming call. I'm wondering if anyone knows what could be done to sort the problem? They'd be quite happy to convert the phone into a bellset only if all else fails, as they've gone over to a cordless handset in the meantime but the ring on the cordless handset is woeful! Last edited by boombox; 17th Sep 2021 at 11:16 am. Reason: wrong bit |
17th Sep 2021, 11:51 am | #2 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,865
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Re: Broken 746 telephone
They're very simple phones, and I think you'd be able to find out what's wrong if you took the cover off.
Look for cracks on the PCB and the ASTIC ("transformer") wires pulling away from their solder terminations; the expected DC resistances are printed on the ASTIC. You may have more than one fault, so examine the bell "motor" too. N. |
17th Sep 2021, 1:30 pm | #3 |
Pentode
Join Date: Jan 2019
Location: Manchester, UK.
Posts: 163
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Re: Broken 746 telephone
Following from #2 the mechanism from the cradle may have been disturbed upsetting the switch hook microswitch operation.
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17th Sep 2021, 1:53 pm | #4 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,865
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Re: Broken 746 telephone
Good point. In fact, that's the most likely explanation by far.
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17th Sep 2021, 2:09 pm | #5 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,130
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Re: Broken 746 telephone
I wonder whether the eccentricity of the bell gongs has been disturbed so that they're no longer optimally positioned for the striker - particularly whether the bolts have come loose and the gongs are no longer firmly held in one position.
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