Panasonic SA-VK470EE Service Manual page 57

Step 4 Remove 4 screws at the rear panel.
Step 5 Lift up the D-Amp P.C.B. together with the chassis
support as arrow shown.
Step 6 Remove 3 screws from D-Amp P.C.B..
Step 7 Lift up D-Amp P.C.B. as arrow shown.
Note: During reassembling procedures, ensure the P.C.B. is
seated properly at the chassis support.
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SA-VK470EE