2465a error


Hello: Classic and frequent issue, all of these >20 yrs old scopes have NVRAM and backyup batteries failing dso CAL is lost.

The ?????? and errors are the symptom of NV ram battery dead CAL constants lot.

Check schematics for A5 board for your model and serial.

Many long threads on this group and on EEVBLOG.

Search 2465 NVRAM, 2465 A5 board 2465 battery also check for corroded SMD lytics.

Bon Chance



I have a 2465a at the start up display : test 04 fail 03; after it seems works normaly but the bottom line has "?" characters instead of blank characters.
thanks for the help