EEVblog Electronics Community Forum

Electronics => Repair => Topic started by: Crambone on December 09, 2022, 01:38:14 pm

Title: Battery replacement HP 8901B
Post by: Crambone on December 09, 2022, 01:38:14 pm

The 2.8v battery in the HP 8901B is said to be, “Non Volatile Memory” it is a 4331DE number battery.
Question is can I replace without jumping in a power source and just remove old and replace with new?

Title: Re: Battery replacement HP 8901B
Post by: Tony_G on December 13, 2022, 07:17:33 am

I'm pretty sure that there is nothing held in RAM that relates to calibration data (i.e. the RAM is just working memory) - The service manual doesn't mention anything more than just disposing of the battery correctly - I've had my 8901 for almost a decade and haven't experienced any issue with the battery (it is only used I believe when the power drops to the unit).

TonyG

Title: Re: Battery replacement HP 8901B
Post by: TheDefpom on December 17, 2022, 04:18:18 am

I did a couple of repair videos on the 8901B, I have included them below in case they are of help to you, I don't think I showed the battery replacement in them though.

Part 1:
https://www.youtube.com/watch?v=4P7Gk_z_WOU (https://www.youtube.com/watch?v=4P7Gk_z_WOU)

Part 2:
https://www.youtube.com/watch?v=VllReFFbzTU (https://www.youtube.com/watch?v=VllReFFbzTU)