[sdiy] Alpha Juno battery replacement

[Adam (synthDIY)]

Thanks for the heads up Richie!

Just opened my MKS-50.
Battery looks OK 
Measures 2.9 volts.
I think it's the original, soldered in, which means I must have never seen a low battery warning since I've owned it since the 90s, because I always replace these with holders!

Plenty of room for a holder in the chassis, off the board.

A

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> On 2 Sep 2026, at 05:58, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
> 
> Just changed the battery in my Roland Alpha Juno 2 that was likely 40 years old!  The old Sanyo CR2032 coin cell looked fine from the top (+) side, measured 3.295v and hadn't shown any battery warning message on the synth's display.  In fact it's terminal voltage was higher than my brand new Panasonic CR2032s that both measured 3.278v.  However, when I de-soldered it the hidden underside was covered in tiny crystals and green crud (>.<) Looks like I got there just in time!  So, don't wait for the low battery message, or visible corrosion, and don't wait for 40 years before changing it!!!
> 
> For anyone with an Alpha or MKS-50 there's an excellent step-by-step guide here:
> 
> https://llamamusic.com/mks50/MKS-50_battery_replacement.html
> 
> -Richie,
> 
> 
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