Zaccaria/Associated Leisure Hyper Sports Maintenance 2021
27/05/2022 - Game PCB #001 repair
Pre-show testing discovered sprite corruption and the game PCB was removed for repair.
On the bench, the Shoestring test ROM was fitted that confirmed ROM and RAM tested OK. In game
mode using a video probe found the data bus of ICs H8 & H9 (2214) noisy compared to ICs
J8 & J9 (2114). Comparing ICs H10 & J10 (LS245) and ICs H11 & J11 (LS244) found:
- H10 pin 1 equivalent to J10 pin 1
- H10 pin 19 equivalent to J10 pin 19
- H11 pin 1 not equivalent to J11 pin 1
Checking with a scope found H11 pin 1 OBJSEL had a poor logic low level. This traced back to
IC E3 (LS04) pin 10 and the scope revealed that all the logic low outputs from IC E3
were marginal. A piggyback check cleaned up the graphics and replacing IC E3 (LS04) fixed
the game.
Hyper Sports Maintenance 2022
prswan@gmail.com