Introduction
It had been working OK for about 18 months and then after leaving it to charge overnight, I tried to use it, but it now turns itself off a few seconds after it is turned on.
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Remove the four black plugs with a picker and use a PH1 Philips to unscrew the four screws. Unscrew them in a crisscross order to avoid stressing the internal plastic screw bosses. You can then pry off the bottom cover and open the unit.
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Using a PH0 tip, remove the four smaller screws holding the top cover and the three holding the motor. You can now separate these parts, be careful, because the charging socket leads are still connected.
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You can now separate all the main parts and pry off the PCB to enable inspection and testing.
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