Panasonic SA-AK640E Service Manual page 210

CRS1
Step 19: Insert the service gear into the service hole and
rotate the gear anti-clockwise.
Step 20: Press and hold the plunger lever and rotate the
gear clockwise until it stop.
Step 21: Release the plunger lever, rotate the gear
clockwise continuously until it stop at "HOME" position.
Step 22: Install the trigger slide plate as arrows shown in
sequence.
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