My out of 1 year warranty DVDR75/051 (receipt was binned) was experiencing the stuck in “dealer/demo” mode so I reflashed the firmware and opened it up to clean the laser lens with isopropanol and cotton buds. The DVDR75 now operates - haven’t put it to standby yet (also changed the Standby setting to “Low Power” as I think the original problem was related to the standby setting going to "Demo mode).
The current problem is that when in Tuner mode the picture is displayed okay but no audio is output to the TV via the scart. The scart connection to the TV is okay as audio is present when a DVD is played. I think I must have unseated a connection ribbon when I was cleaning the laser lens. Anybody have any ideas what I should check is connected correctly? I have the service manual for the DVDR70 and DVDR75/0x1 if that is any help to anyone - it is 29Mb in Winzip format.