Got in the mail today this Tatsujin Oh PCB (japanese release of Truxton II), a great vertical shoot ’em up released by Toaplan in 1992 :
The board was bought on eBay and according to the seller it didn’t accept credits.But actually, when I powered it up, it booted to a ‘TILT’ message screen and then kept resetting in an endless loop:
I have experienced this issue many times and the culprit was always him, the “infamous” ‘HK-1000’ :
This custom IC handles all the inputs including SERVICE, TEST and TILT and it’s a very prone to failure part, especially the first ceramic revision (like the one present on this board) cracks very easily or goes internally bad.As you may know, I have done a reproduction of this custom IC so I installed a unit after removed the original part and put some round machine pin headers :
Board booted now into game and correctly played but audio was loud, especially explosions and other sound FXs :
As you can see in above video I could not even adjust the volume by acting on the 1K potentiometer :
So I removed it:
It was broken as it fell off in pieces :
I installed a good one:
Sound was fully restored, board 100% fixed.End of today job.
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