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-   -   My Smart-1 4 line looses programming (https://www.vintage-radio.net/forum/showthread.php?t=170788)

dagskarlsen 6th Sep 2020 8:56 am

My Smart-1 4 line looses programming
 
My Smart-1 4 line version looses programming on power-outs.

I am not able to locate any internal battery for the memory. Any body out there who has solved that?

https://www.britishtelephones.com/smart14line.htm

All hints are welcome.

dsk

Graham G3ZVT 6th Sep 2020 2:29 pm

Re: My Smart-1 4 line looses programming
 
2 Attachment(s)
I looked at mine and can't find a battery or a supercap. Perhaps it is corrupt NVM that causes the processor to do a hard reset?

The only other thing is a "long star @ power-up" reset being performed, however unlikely.

Even when these were new, it could be a challenge to find a phone that sent continuous DTMF.

dagskarlsen 6th Sep 2020 8:48 pm

Re: My Smart-1 4 line looses programming
 
Quote:

Originally Posted by rambo1152 (Post 1286643)
The only other thing is a "long star @ power-up" reset being performed, however unlikely.

Even when these were new, it could be a challenge to find a phone that sent continuous DTMF.

At least I have such phone :-)

Dr-of-style 8th Sep 2020 12:28 am

Re: My Smart-1 4 line looses programming
 
You could put a small ups on it.
It would hold quite a while in an outage.
If there are no jumpers for ext Batt, not much you can do.
:beer:

dagskarlsen 9th Sep 2020 9:50 pm

Re: My Smart-1 4 line looses programming
 
I had an American version not working too, that one had a leaking battery I have replaced it with something I had, time will show how it turns out.

dsk

dagskarlsen 26th Sep 2020 12:49 pm

Re: My Smart-1 4 line looses programming
 
I have changed battery on 2 of the American versions, one works like it should, but the other does not.
The other got a battery across the 5V capacitor, in series with a diode, I used a Li-ion battery (18650) and a resistor shunting the diode so it will "charge" with 0.1 milliamp to keep it full. (Do not know how that will turn out, but at least with new battery it keeps the memory for at least 12 hours, and so long power-out does "never" happen.

dsk


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