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problem with battery replacement in a tektronix 2445b oscilloscope

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jsblues81:
Is there anybody out there who knows how to replace the internal battery and how to access it once found in a tektronix 2445b scope...thanks in advance for you help.

bdunham7:
It depends on whether or not you have an early or late version.  The early version has an Eagle-Picher LTC-7P Li-Thionyl keeper battery installed on the A5 controller board.  The later version has Dallas NVRAM with integral batteries and replacing those is much more involved.  I believe if your scope is has a serial number below B049999 it will be the early version, provided it has not been modified. 

Edit: Here is a photo that shows both.  If you're new to servicing these, do not run these scopes with the case removed unless you have a strong fan blowing on the entire underside.

jsblues81:
Thanks for the fast response...My scope is #b050143 and has the dallas sram chip...any thoughts on how to approach this...I have been repaiuring and designing analog equipment for over 50 years but am relativly new to diugital,however I can handle tough problems so please your thoughts..thanks.

bdunham7:
Has the battery gone dead and resulted in you getting a Test 04 failure when you start the scope?  Or are you at some other point?

There has been extensive discussion of replacing these NVRAMs here and elsewhere--search EEVBlog and https://groups.io/g/TekScopes/topics for detailed help on this.  I do not know the current best solution nor what will work best for you.  Buying a replacement Dallas NVRAM may not be a good option because they stopped making them long ago and your market choices are very old NOS (not good for something with a battery) and counterfeit.  If you've lost your calibration data you will need to calibrate the scope once you are done, if not you need a programmer to copy over the info.

jsblues81:
Thanks again...what was coming up upon bootup was test 05 fail 44. I am not sure exactly what that means...manual says positive level too positive.Whatever that could mean, I could think of a few things that could mean...but upon looking for a voltage on the control board, there are no voltages on any chip on any pin when the power is off. Is this too far gone...I bought this for $100 on ebay as is..please advise. I will however check the forums you suggested..thanks again.

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