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TonyDuell · 24th Jul 2022, 9:44 am

There's no official schematic, I do have the reverse-engineered one of the board in my 150-II but it is very possible that there were several manufactuers of said board. My HP150-II is a very early one, so early that the 'Elmer' ASIC is actually a daughterboard full of standard ICs fitted alongside the coprocessor board.

Let's see how close our two boards are before going much futher.. The monitor-related ICs on mine are :

Vertical deflection : IC31 AN5763
Horizontal centring/delay : IC42 AN5791
Horizontal osicllator : IC41 AN5753

If those agree it's worth me suggesting testpoints etc

24th Jul 2022, 9:44 am	#6
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,215	Re: HP 150 Touchscreen II repair There's no official schematic, I do have the reverse-engineered one of the board in my 150-II but it is very possible that there were several manufactuers of said board. My HP150-II is a very early one, so early that the 'Elmer' ASIC is actually a daughterboard full of standard ICs fitted alongside the coprocessor board. Let's see how close our two boards are before going much futher.. The monitor-related ICs on mine are : Vertical deflection : IC31 AN5763 Horizontal centring/delay : IC42 AN5791 Horizontal osicllator : IC41 AN5753 If those agree it's worth me suggesting testpoints etc