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Generalmusic (GEM) S2R with battery problem

A friend of mine found a GEM S2R. Dead. Battery (internal NiCd) was completely dead and some leakage had occoured. A new NiMH was installed but the unit was still dead. Well, not completely dead. Some strange things appeared on the LCD, as shown in the video below.

I will probably have to clean the are on the mainboard around the battery and replace some IC´s.

The area around the battery is shown in the picture below. The blue-green powder is from the leaky battery.

GEM-S2R-battery-leaked-LCD-chips.jpg

Great links:

Thread at Gearslutz

Schematics, manual and sound-disks

Someone visiting the abandoned GEM factory