Backup battery change

This radio was a christmas present given to me by my parents in 1991 and has seen extensive use. After being replaced by the MC-22 it has served as a backup radio. I planned to start using it again as an easy to carry indoor and small electrics radio when I noticed that the backup battery was empty, it deleted all settings each time it was turned off. That’s a bummer after you have just set up a model. The radio is worthless without backup battery so I started taking it apart and here’s how it went.

Removing the screws in the backplate and taking off the two main connectors between the transmitter module and the main circuitry leaves no clue as to where the battery is located. But I suspected it was attached to the main circuitry surrounding the display, so…

Removing the screw holding the main circuit board did not allow me to get it off so I had to remove all 8 screws that hold the stick assemblies in place to get some more clearance.

Turn the circuit board around, and voila! A very dead, almost 20 years old 3V lithium battery (CR2032). To my great surprise, the bastard battery was not meant to be replaced, it’s soldered to the battery clamps! I had to remove the battery clamps by de-soldering them from the circuit board (easy does it!) and then pry them off by force. The clamps survived and although not looking like a basket of fruit anymore, soldering on a new battery should pose not problems.  What thoroughly scares me though is getting the circuit board back in place, in front are 6 buttons with metal springs for the buttons in the front panel and you have to work blind while installing them. 



  1. Mikael Vendel
    Posted October 20, 2009 at 13:57 | Permalink

    Jag har en 347:a också…Antagligen måste jag med byta batteri.Enligt vad jag inhämtat på Nätet, så bör man skaffa det nya batteriet med löd-öron och koppla in det INNAN man löder loss det gamla, för att inte hela tjillevippen går i baklås….
    Hur gick det för dej?? Fanns dina default-inställningar kvar efter batteybytet??

  2. Jon Gunnar Wold
    Posted October 20, 2009 at 14:23 | Permalink

    Ja, man bør ha et batteri med loddeører :-)
    Det gikk ikke særlig bra, batteriet har gått igjen så jeg antar at det ble skadet av loddingen. Radioen fungerer, men uten backup batteri er den tilbake til fabrikk-innstillinger hver gang den slås av/på. Det er umulig å bruke siden alle modellminner slettes for hver gang. Jeg skal forsøke igjen nå som flysesongen snart er slutt.

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