ferguson fv77 hv

[tinpan]

Does anyone know how to disable the stereo hi-fi in the sound section?
I live in the Winterhill Transmission area and the Ch 5 is very weak.
When recording and subsequent playback, the unit is trying to find the best sound signal source and is constantly switching across the standards, causing the sound to go on and off. It works fine on all the remaining channels.
I do not need the nicam stereo hi-fi. I just need the normal audio head source for sound.