[time-nuts] SRS SR620 counter problem

paul swed paulswedb at gmail.com
Tue Oct 26 12:14:25 UTC 2010


Looks like a normal 32 x 8 static ram. But before you go ripping it out.
Cut and lift the power pin and measure the current draw. You can always
resolder a wire to the lifted pin. Should be 1 ua or less in power down.

On Tue, Oct 26, 2010 at 2:34 AM, Robert Atkinson <robert8rpi at yahoo.co.uk>wrote:

> I'd change the CMOS RAM next.
>
> Robert G8RPI.
>
> --- On Mon, 25/10/10, Corby Dawson <cdelect at juno.com> wrote:
>
>
> From: Corby Dawson <cdelect at juno.com>
> Subject: [time-nuts] SRS SR620 counter problem
> To: time-nuts at febo.com
> Date: Monday, 25 October, 2010, 23:39
>
>
> Hi everyone!
>
> My SR620 is giving me an error 3 on power up. The manual says it's most
> likely a dead backup battery.
>
> I can clear it if I hold down the reset button while powering up. (This
> loads the factory defaults into the RAM.)
>
> However if I cycle power the error 3 comes back!
>
> The battery reads 3.44VDC and at the VCC pin of the Ram you get 3.20VDC
> with the AC power off.
>
> This seems to indicate the battery is good.
>
> I'm thinking of placing a 1K resistor across the battery to see if a load
> will cause a big drop.
>
> Any suggestions?
>
> The RAM is a CXK58257AP-70L.
>
> Thanks,
>
> Corby Dawson
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