Hi there = You might be able to sort the problem if u look at the Service Manual pdf - u get to it via the Products and follow the links.  All the info u require is there, but if this is too difficult for u, then a pic of your pcb might point me or someone to the problem - always worth a try! = Brian (Northumberland)

Hi again = Is it the 5-way con from/to the Data Link board (pcb2) that is the problem?  If so, you can easily trace the cons from pcb2 to the main board - the 5-way con strip is there right in the centre (almost).  If you look in the Service Manual 1-4 its there - if your eye-sight is good, you should have no problem!  Let me have some feedback.  = Regards Brian (Northumberland) 

A bit more = Also look at 1-5.  On page 1-4, you can see con 1 is joined to the anodes of both D4 and D5. Then if u look at 1-5 you will see that it goes to R2 and C4 on the main board - similarly with the other cons! This way you should see how all 5 cons go.  Good luck.

Thank You for your help. Im sorry for the slow response, my email placed this as junk. Nevertheless, all you info has helped me get started, which came with some delay. 

OK thanks for coming back - let us know how you eventually get on - you ought to be able to fix this one ok! = Brian (Northumberland)