REPLACEMENT OF BIAS BATTERY ON MULIPLEX 3030

Any old or new electronic projects on the go
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OZPAF
Posts: 3
Joined: 06 Oct 2021, 05:16

REPLACEMENT OF BIAS BATTERY ON MULIPLEX 3030

Post by OZPAF »

I received a multiplex 3030 for a very good price and before upgrading it to 2.4 Ghz , would like to replace the on board bias battery.
I believe the new battery needs to be installed in parallel before removing the existing one, to avoid a break in supply to the computer chip.
the existing battery is a MnO2- lithium - Sanyo CR2500(? number obscured) which has a bracket spot welded to the positive face, and with the connection to the -ve side of the case obscured.
I have read that soldering to these batteries is not good practice and I'm curious about the negative contact.
Has anyone here had any experience doing this?

Thanks
John
bluejets
Posts: 316
Joined: 19 Jun 2019, 04:09

Re: REPLACEMENT OF BIAS BATTERY ON MULIPLEX 3030

Post by bluejets »

Not difficult to solder a couple of wires to the tracks and add an external battery and case such as a CR2032.
Tape up so nothing comes in contact with it and shove away in a corner somewhere.
Done it on the JR388 no worries.

Then cut the old battery out afterwards.
coin battery.jpg
coin battery.jpg (11.21 KiB) Viewed 3901 times
OZPAF
Posts: 3
Joined: 06 Oct 2021, 05:16

Re: REPLACEMENT OF BIAS BATTERY ON MULIPLEX 3030

Post by OZPAF »

Thank you Kalle and Bluejets - that is exactly what I need Kalle.

That is also a possibility Bluejets.

I'm busy translating :D

This MPX 3030 is too good to throw away and as a MPX user for 30yrs - I couldn't do that anyway.

Cheers

John
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