HP150 Touchscreen again

OK, that makes sesne. I assume there's the normal HP-HIL slave chip in there too. It never fails to amaze me how easy it is to get spares for classic computers. Yo uwould ahve thougth that a spare LED for a touchscreen on the HP150 would be somewhat hard to find after more than 25 years. Well, as I said, I thought that RS and Farnell did something similar. For a laugh, I checked Maplin (hobbyist supply of components, limited range, rather like Radio Shack, alas). Amazingly they listed a side viewing IR LED. Even more amazing, the Maplin shop I was going to go past had 2 in stock. Of course I bought them. I fitted on in the touchscreen PCB and tried it on the tester again. Perfect. Then I put the whole HP150 back together again. The machine works fine, but I am having problems with the head motion of the internal 2674 printer (and which idiot decided that printer-out-of-paper should be a self-test failure? I spent quite a time trying to find 'real' problems....) Anyway, The machien si back together for the moment, I will look at the printer soon... -tony