Panasonic EYFPA1J Service Manual page 7

3.2.3. Integrity
• With the switch activated, shake the tool back and forth and up and down and verify that its sound does not change excessively.
• Verify that there is no dirt, scratching, or other damage on the tool's exterior from the repair process.
(Check the shaft cover assembly carefully for surface scratches since it is made of aluminum.)
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