Panasonic SA-VK31GC Service Manual page 13

Step 4 Release the 2 claws, and then remove the CD Lid.
Step 5 Press the POWER button to turn the power on.
Step 6 Press the OPEN/CLOSE button, the disc tray will be
close.
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[Open the disc tray manually (Using service tools)]
Step 1 Insert the gear tool into the hole on the underside of CD
chassis and then rotate in the direction of arrow. The disc tray
will be open.
Step 2 Release the 2 claws, and then remove the CD lid cover.
SA-VK31GC / SA-VK31GS