RDRGX3 Connectivity Information

Hello, does anyone have any information regarding connectivity
information for the following equipment please ?

TV ( 2 scarts )
Digibox ( Panasonic TU - DSB30 )
DVD Recorder ( Sony RDR GX3 )

Absolute novice regarding AV, I have connected the system
as per the Sony manual and it works in as much as I can
record from TV or the Digibox, however I need to turn the DVD
off after recording before I can access the Digibox again.

Something not quite right I'm sure, any help from the forum
members would be very much welcome.

Regards de Wessy