Tektronix 2440 Battery Self-Check Failure Problem

Started by Hawaii596, 12-19-2008 -- 11:30:04

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Hawaii596

12-19-2008 -- 11:30:04
We have a Tek 2440 Scope in lab that fails "4000-FPP" for battery.  It checks out for cal otherwise.  We opened the unit and found a jumper in place of that battery (that looks factory done).

I'm wondering if either someone swapped a board between two different scopes, or is this a glitch in the self-test based on a memory update (i.e.: newer memory chips don't require the battery).

We haven't found it addressed in any manuals; but wondering if anyone here may happen to know about this issue.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883

mdbuike

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12-20-2008 -- 04:19:59
If I mis-remember correctly, the ROM chips have the battery built in, and I think it is serial number dependent.  I recall this problem about 9 or so years ago with a customer.  We were able to get replacements and the problem cleared up.  But, I think we got the last of Tektronix bits then, and they no longer support it.

There should be two chips on the top board that are approx. 3 times thicker than normal..those are the chips with built in batteries (designed obsolescence).

I don't think they're available any longer, so, you may advise your customer to upgrade to a new TDS model, which will at least be supported for another year or two.

Hope this helps,

Mike
Summum ius summa iniuria.

The more law, the less justice.

Cicero, De Officiis, I, 33
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