robotype
Member
anybody tried to put a system 11A board in a system 11B game? in the specific I would like to use pinbot pcb inside elvira...any experience?
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[FONT=verdana,arial,helv,helvetica][SIZE=-1]The most flexible CPU board is system11A. The system11A CPU board can be used in any 1986-1990 sys11, sys11b or sys11c game The only exception is if the sys11A CPU board is going into a original sys11 game (High Speed, Road Kings, or Grand Lizard). In this case, connector 1J15 (four pins, .156" molex male header) must be added to the sys11a CPU board (that's all that needs to be done). To use a system 11a board in a system 11c game, don't use connectors 1J16 (volume control) and 1J15 (speakers). Also the sound ROMs at U21/U22 and CPU at U24 and PIA at U9 are not used, since they are moved to the sound board. [/SIZE][/FONT]
from pinrepair.com
If you get in a pinch rotten dog has replacement mpu's and I have been wondering how well they function.
actually I almost succeeded in repairing my elvira board, the switch matrix was completely shorted I replaced 4 or 5 PIAs, rams and almost all the audio components so now it is finally playable. the only thing I couldn't fix is special solenoid Q79, it works if grounded manually and I replaced driver transistor 2n4401 but the coil won't be energized both in game mode and test mode so I assume it could be a bad 7402 (U50), 7407 (U49) or the pia (U54) or maybe some other component, I would like to find the problem without replacing all of them...
Trace through the driver circuit with Leon's test ROM and a logic probe. That's what I would try.
I just did it and found out there is no exit from U50 to Q78, so I will try to replace that (7402).
Good work!
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Does the fuse blow with U50 removed? If yes, check Q76-79 to see if anyone are shorted, also check the coils and thier diodes. Pins 2-3-4-5 of U50 are inputs from the data bus and output to Q78.
Did you check all the output transistors Q69,71,73,75,77,and 79 for a short to ground?