Panasonic SA-AK640E Service Manual page 36

Step 2 Detach cable (CN5950) remove the 5 screws on Power P.C.B..
Step 3 Remove Power P.C.B..
Note:
Insulate the Power P.C.B. with insulation material to avoid short circuit.
- Replacement of the Power Amp IC or Voltage Regulator
Step 4 Remove 2 screws at the Power Amp IC and/or 3 screws to
Voltage Regulator.
36