hifi engine

Service manual for a DENON DN-770R

Hi everyone, i'm looking for a SERVICE MANUAL for my Denon DN-77R twin cassette deck.

Can anyone help?

The VFD display has began to fail, it is a power supply related fault, as the same display lights up perfect when placed into another DN-770R.

Any help would be appreciated.

Or any info if someone out there has had and cured the same fault.