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First check the pressure of low and high side, for R22 they should be around 60 and 250 respectively.
Second
check the temperature of the compressor by touching it lightly from bottom to top. where you can feel the level of oil present in it
Third .(Cut the power supply before touching it)
if the compressor is not running at all,
check the electric continuity between terminals and body, if no connectivity is checked then check resistance between terminals of compressor
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