I can verify that from my search today. I can also verify these EAROMs can "forget" after ten years without rewrite. So they need to be refreshed. But that is done in the calibration sequence and I dont want to do that right now.
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--- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote:
Patrick, I think the A5 boards without the battery have a flash memory. U2008, a ER1400 EAROM holds the cal constants.
Regards,
Tom
----- Original Message -----
From: Patrick Wong
To: TekScopes@...
Sent: Monday, February 25, 2013 6:52 PM
Subject: [TekScopes] Re: New here with a 2465 to clean up
Hi Mac,
Again, qservice.tv is our friend. See:
>
In case the link doesn't work, I found the listing for the 2465A A5 board which includes a few photos. You will see the lithium battery with a yellow label. (By the way, when I bought replacements from Mouser, the new batteries were totally black, no yellow label.)
I also looked at the A5 for the 2465 and did not find a battery. Perhaps the repair manual theory of ops might indicate how calibration constants are maintained when the unit is powered down.
Thanks,
Patrick Wong AK6C
--- In TekScopes@..., "machineguy59" wrote:
>
> I cannot find a lithium battery anywhere in teh scope. Unless it is buried inside a DIP on A5...I will read the calibration procedure to see what they call out for changing ROM values and post back if I find anything.
