Panasonic PV-D4733S-K Service Manual page 122

5. After comfirmation, remove a Disc from the Tray and press POWER
OFF to end this menu.
How to update the firmware of DVD:
1. Turn on the power.
2. Set the unit to DVD mode.
3. Press OPEN/CLOSE button to open the tray. Then, place the Firmware
Disc for DVD in the tray.
4. Close the tray. Updating will begin automatically.
5. After approx. 1 minute, the tray will open automatically.
Note:
If the tray has still not opened after 3 minutes, updating was
unsuccessful. In this case, repeat above steps from step 1.
6. Remove the Firmware Disc from the tray. Then, disconnect the AC
Plug. (The tray will not close.)
7. Connect the AC Plug and turn on the power. Then, reset all VCR
memory. Refer to "HOW TO RESET ALL VCR MEMORY FUNCTIONS."
CAUTION:
1. Do not unplug the AC Cord during updating.
2. Do not press any buttons during updating.
4.1.8. SERVICE POSITION
4.1.8.1. Service Position
CAUTION:
HOT CIRCUIT (Primary circuit) exists on the Main C.B.A.
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