Introduction
These are the preliminary steps that are often useful when you think about repairing something.
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            If it is not obvious, check if the behaviour is actually a problem or not. 
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            Pro tip: even if this is the intended behaviour, you are entitled to modify it, if you like. Just it's not "fixing" anymore: that's hacking! 
 
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            Did you forget to put the plug in the socket? Did you check the battery? Is the light bulb burn out? 
 
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            Speak with friends, family or colleagues. Even if they don't know anything, speaking helps a lot the reasoning. 
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            Speak to a rubber duck 
 
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            Take a minute to think if there is anything that could be a safety hazard. 
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            Check the user manual and the package, if available, and the device itself for any danger label. 
 
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You are now ready to repair your stuff!
I want to fix razor hair clipper of Philips HC 3420 from loosing speed.
Thank you
dedi zulfikar -