Difference between revisions of "Williams System 8"
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===Power Supply=== | ===Power Supply=== | ||
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==Problems and Solutions== | ==Problems and Solutions== | ||
Revision as of 17:15, 21 February 2012
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Click to go back to the Williams solid state repair guides index.
1 Introduction
The Williams System 8 boardset was used in 1984, and with only one game, a pitch and bat called Pennant Fever. Combining the driver board, sound board, and cpu directly onto one board eliminated several design deficiencies of the earlier System 3-7 boardsets; mainly the 40 pin interconnector, and extra wiring harness interboard connectors.
The System 8 is very similar to its successor, the System 9, but it is more like a "slimmed down" version. There are a total of 8 controlled solenoids versus the 16 used with the System 9 boardset. Another distinct difference is that the System 8 hardware does not utilize special solenoids. Although the System 8 is capable of driving four 7 digit displays and one 4 digit display, only two 7 digit displays are used with Pennant Fever. Therefore, a master display board is not needed. Both the lamp and switch matrices are 8 x 8 in size, but Pennant Fever does not nearly use all of the switches in the matrix.
2 Games
| Title | Date of Release | Model # | Other Boards | Notes |
|---|---|---|---|---|
| Pennant Fever | 05-1984 | 526 |
3 Technical Info
3.1 CPU Driver Board
3.2 Power Supply
4 Problems and Solutions
4.1 Power Problems
4.2 MPU boot issues
4.2.1 Relocating the battery from the MPU board
4.2.2 Repairing Alkaline Corrosion
Remove the battery holder entirely from the MPU board and wash the board's affected areas with a 50/50 mix of vinegar and water. Scrub the corrosion with a soft toothbrush, rinse with water, then rinse with 91% or 99% isopropyl alcohol to displace the water.
4.2.3 Connecting a logic probe to the MPU
4.2.4 Using a PC Power Supply For Bench Testing
4.3 Game resets
4.4 Solenoid problems
this is a stub
4.5 Lamp problems
4.5.1 Lamp Matrix Row and Column Testing
4.6 Switch problems
4.6.1 Switch Matrix Row and Column Testing
4.7 Display problems
WARNING: This circuit uses high voltages. Don't continue, unless you are confident in your diagnostic abilities.
4.8 Sound problems
5 Repair Logs
Did you do a repair? Log it here as a possible solution for others.