Panasonic PV-D4742 Service Manual page 13

If the tray has still not opened after 3 minutes or Error Indication
appears, 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
CAUTION:
1. Do not unplug the AC Cord during updating.
2. Do not press any buttons during updating.
4.1.9. SERVICE POSITION
4.1.9.1. Service Position
CAUTION:
HOT CIRCUIT (Primary circuit) exists on the Main C.B.A.
Use extreme care to prevent accidental shock when servicing.
4.1.9.1.1. Service Position (1)
4.1.9.1.2. Service Position (2)
"HOW TO RESET ALL MEMORY
Fig. 7-1
Fig. 7-2-1
13
FUNCTIONS."