[volt-nuts] 7061 On Board Clock and Battery

[Fabio Eboli]

I didn't have the time to study my 7061 enough.
I just gave an eye to the pcb's:

The earthy logic has this sticker:
PCB 70610513A
main firmware memories are D27C256D-15 the revision is AB

floating logic pcb is 70610515X B
SP1 selects 2716 memories
SP2 selects 2732/64 memories
on the pcb there is also an hand written sticker : ST/255/34 A0011

The memories on floating board are 4 M5L2764 k-2 with FW revision CA
As I understand these memories don't contain executable
code but data bit patterns used to command various signals needed
for the measurements setup.

The SP1/SP2 selects the address line A11 on the memories for +5V
or Ground, so one of the two has to be shorted.
It's strange that mine are both disconnected, it isnt ok leaving
the address line disconnected. When I have time I must indagate better.

Fabio.

"J. L. Trantham" <jltran at att.net> ha scritto:

> OK!
>
> Now I understand.  On my unit, SP1 is soldered 'closed'.  SP2 is 'open'.
>
> As I said earlier, I have the 'AA' version of the Floating firmware with
> TMS2516-45JL chips that have 24 pins.  They are on the PCB 70610505Y F board
> which I interpret to be the 'Revision F' board.  There is room for a 28 pin
> socket.  I wonder if it would be possible to modify my board for the 28 pin
> EPROM's?
>
> I would be interested in knowing what board the 2764 chips are on.
>
> Thanks.
>
> Joe
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
> Behalf Of Fabio Eboli
> Sent: Monday, June 25, 2012 5:03 PM
> To: Discussion of precise voltage measurement
> Subject: Re: [volt-nuts] 7061 On Board Clock and Battery
>
>>> I don't understand 'SP1 and SP2 on floating board are both open circuit'.
>>> To what does this refer?
>>
>> In this photo...
>
> ... the photo :)
>
> http://www.flickr.com/photos/14336723@N08/7443455140/
>
> Fabio.
>
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