Introduzione
Tearing down my DPTA-RS1 stylus and replacing the dead li-ion battery without damaging the cosmetics.
Ricambi
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With the buttons removed, you can now slide out the guts in the tip's direction. You can now perform a battery replacement.
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Apparently, the pen is built by Hanvon and is powered by ATMEL's (now Microchip's) maXStylus Technology.
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ATMEL maXStylus mXTS220 Capacitive Stylus Driver
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TI BQ24232RGTR Li-ion Battery Charger
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Conclusione
To reassemble your device, follow these instructions in reverse order.