adamok7 perfect thank you.. and from that I have been able to locate the correct datasheet 8252...

truclacicr
Now I am really baffled.. I have just realised it does not have any connection to pin 3 (Ouput) so can't be a 555 timer can it...

truclacicr
whoops I forgot to include pin 7 of the IC, which connects to the base of NPN Q5 transistor...

stj
Thank you for pointing that out. I actually didn't see that one. I think I managed to locate a few that were broken/cracked.. and still going through them slowly...

truclacicr
Thanks as always. I think sometimes I over think it in regard to the component searching, and try to use the sites that let you search by the Marking code, instead of trying to do a standard google image search first.
In regard to the IC 8pin SOIC connections are as follows ( I think it is just 555 timer chip - but just want some clarification please):
Pins are as follows:
Pin 1 connected to Cathode of D1 diode and bridged with pin 4
Pin 4 goes to collector of PNP (Q3) transistor via current limiting resistor
Pin 2 goes to collector of NPN (Q4)and...