Panasonic SA-DA15 Service Manual page 14

Step 14 Remove Tone Knob, Selector Ring, Light Guide and unscrew the nut.
Step 15 Remove all the screws. / Take note of CP503.
Step 16 Remove all the screws.
Step 17 Release the AC In/Out P.C.B. catch.
Step 18 Release the CP771 and pull out the rear panel in the direction shown.
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