Looking through the service manual I don't see a connection from the battery
to the NVRAM. I am sure I measured battery voltage on pin28 so I suspect a
schematic error. Can someone that has one open verify that? My 3457 is in
cal and I prefer not to break the seals.
----- Original Message -----
From: "Mark Sims" <hol...@hotmail.com>
To: <volt-nuts@febo.com>
Sent: Sunday, January 24, 2016 7:36 PM
Subject: [volt-nuts] Wanted - UK source of a replacement battery (type LX
1634) for HP 3457A 6.5 digit multimeter
Although I have not done this on a 3457A, I have done it on other
devices:
Take new 3.6V battery. Solder silicon diode to new battery lead (near the
cell) to drop voltage to 3.0ish volts. Solder battery / diode to existing
battery leads (near the circuit board). Cut old battery free.
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