Panasonic SA-HT650P Service Manual page 21

Step 1 & 2 : Remove all the screws.
Step 3 : Slightly spread open both sides of the cabinet before lifting it upwards to remove.
Step 4 : Remove the top cabinet.
- Carry out the check for Power P.C.B. as per condition indicated in
diagram shown below.
Step 5 : Remove all the screws.