Arcade Collecting > Pinball
Black Knight
ChadTower:
Replaced offending header and connector. Now all of the switches in that string work except 18 - center trough switch.
The other wire on that one is white-red on a different connector... :P Hopefully it just needs a cleaning.
Gah...
--- Quote from: http://www.pinrepair.com/sys37/index3.htm#switch ---Incorrectly Assembled Factory Switches.
Part of the problem Williams was having with switches was due to an assembly mistake, which started in the mid-1970s (pre-solidstate). It turns out Williams was assembling one of the pair of leaf blades backwards. This was not a huge deal with Electro-Mechanical (EM) games, but with solidstate games, it was a BIG problem. Because solidstate games use low voltage (5 volt) switches (unlike EM games in which all switches were high voltage 28 volts), the contact rivets are gold plated to help keep them clean (gold is a non-corrosive metal). But because one of the switch blades was reversed, a gold plated switch rivet made contact with a gnarley rough non-gold plated switch rivt.
Problems occurred mainly with any switch where a ball "sat", like the ball trough, lock or kickout holes. This mistake was not realized until the Firepower era, and Williams offered retrofit kits for Firepower and Black Knight ball troughs using microswitches to fix the problem. Note an improperly assembled leaf switch can be taken apart, spliting the bakelit "switch stack", and turning around the incorrectly assembled leaf blade.
--- End quote ---
This game seems to be riddled with switches where the gold pad is on the outside of the switch... I might have to address that during the swap. I'll think about it.
ChadTower:
Getting closer... cleaned switch 18 and it registers in switch test now. Unfortunately when I play a ball it still doesn't register drains. All trough switches work in test so I guess next is to play around with them in play mode and see if they are all working in actual use.
EDIT: meh, apparently there are more problems than this in play. It's talking but no game sounds. Balls not ending. Two captured balls doesn't kick a third... etc etc.
ChadTower:
--- Quote from: http://www.pinrepair.com/sys37/index3.htm#sound ---Sound Board Test Works, but Missing Sound in Game.
Sometimes there will be a problem where the game is powered on, sound test button pressed, and all the sounds (and speech) work. But in game mode the sounds don't work. Usually this is a 6821 sound board PIA problem, or maybe a 6810 problem. But here's some things to try:
* Verify with a logic probe that the 5 signal lines to the sound board are all pulsing low when cycling through solenoid tests 9-13.
* Grounded each signal pin at the sound board and see if sounds are produced.
* Measure the associated pins on the 6821 when you're grounding pins on the sound board connector pins.
* Check sound board IC6 pin 13 (4068). It should pulse high whenever you ground a pins on the input connector.
* Check sound board chip 6821 pins 37/38. If it's working, the /IRQ will go low when you ground input pins.
--- End quote ---
So at least that's the next steps. Haven't used a logic probe yet but I'm about at that level of troubleshooting now, I think.
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