Believe it or not, from an old digital stop watch!

A little bit of detective work by looking at the actual cirucuit boards inside the control unit, I identified 4 oscillators on the board, then sat and entered the IC numbers of the chips around the oscillators into google, I found an IC which was a real time calendar and clock.

Looking at the manufacturers info sheet on the IC found that the oscillator input needed to be 36.325 MHz, and just by chance had an old stop watch with the same rated oscillator on board. So I swapped the one from the system and was delighted with the results.

Luckily the KX-T616, as the guys said is an old system and does not have multi-layered PCB boards, otherwise this wouldn't have been possible.
Fortunatly I have a little electronics know how and was able to carry out the repair myself, saving £££ on sending it away or even replacing the system.

Once again guys thanks for all your help!

Why fight to live, if we're living to die?