Technics SU-X301 Amplifier Problem

[Ren]

Could someone point me in the Right direction.

I have a Technics SU-X301 Integrated Amplifier. Class A..
I have all of a sudden begun to experience a bloody frustrating problem with
it.
Whats happening is,

When selecting the Audio Source, be it CD, Tuner, Aux, Phono, the Amp takes
the choosen source for an unknown period of time, then all of a sudden it
will switch itself to the TAPE input mode..
I have had this in pieces time and time again, looking for any dry joints
ect, but with no joy.. I have checked the little switches on the input
select board, but they are ok, as by disconnecting the input select board,
the Amp will still run on the last choosen selection. It still faults out.
I see the problem being on the main selection board which is located behind
the Input select board that has a few IC's aswell as the LCD IC driver chip.

Can any one help, or maybe even spare me a copy of a skematic service
manual.

Cheers..

Ren.. NZ

[Nigel Cook]

I have a service manual for this amp
e-mail div...@tcp.co.uk
electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse
regards,Nigel,Southampton,England