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Old 20th Feb 2014, 8:41 am   #1
M0SOE_Bruce
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Default Diagram needed for AT3796/N1070

Looking for the wiring diagram LD133/1 for the GPO AT3796 switchboard aka N1070.

Flag drops and buzzer works when sub goes off hook but when answer cord plugged in line is dead.
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Old 22nd Feb 2014, 7:18 pm   #2
AndiiT
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Default Re: Diagram needed for AT3796/N1070

This one?

Regards

Andrew
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Old 22nd Feb 2014, 8:03 pm   #3
M0SOE_Bruce
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Default Re: Diagram needed for AT3796/N1070

Thanks Andrew,

I've been working from a photograph of a printout that isn't quite all in focus. Although the original print is drawn different it appears the circuit is the same.

Bruce
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Old 24th Feb 2014, 12:29 am   #4
Pellseinydd
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Default Re: Diagram needed for AT3796/N1070

Quote:
Originally Posted by M0SOE_Bruce View Post
Looking for the wiring diagram LD133/1 for the GPO AT3796 switchboard aka N1070.
Flag drops and buzzer works when sub goes off hook but when answer cord plugged in line is dead.
The Switchboard AT3796 is not the same switchboard as the Switchboard N1070. They may look the same but internally the circuitry, particularly the cord circuitry, is quite different. The N1070 was introduced about 1954 to improve the circuitry for signalling and transmission.

The N diagram for the Switchboard AT3796 is N1093 which dates from 1935 when it replaced the earlier Switchboard AT1810 (N1090) of 1925 which again looked very similar and replaced a yet earlier version of the 10+50 style.

You'll need to check to see which version you have - there should be a wiring diagram LD.... pasted inside the rear door which should be the clue - LD41 = AT3796 and LD133 for the N1070
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Old 25th Feb 2014, 7:39 am   #5
M0SOE_Bruce
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Default Re: Diagram needed for AT3796/N1070

Is there a way to easily tell the difference between the two?

The back panel is missing.
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