Panasonic SA-HT540E Service Manual page 35

Step 9 Pull the lever (B) in the bottom side to your side and
remove the change lever.
Step 10 Remove the drive rack, the sub rack and the drive
gear.
11.1.4. Disassembly of Tray Loading
P.C.B.
Step 1 Remove 3 screws
11.1.5. Disassembly of Optical Pickup
Unit
Special Note: Anti-static measures are necessary due to
handling of OPU unit .
Step 1 Spread the tabs to push in the pin.
Step 2 Remove 4 pins.
Step 3 Remove the middle chassis.
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SA-HT540E / SA-HT540EB / SA-HT540EG