Mata Hari
Bally, 1978New problem with my Mata Hari that only seems to happen after a half dozen or so games have been played. The 1000 point chime just stops working. It doesn't seem gummed up and the wiring to the coil seems ok. After the game has been turned off for a little while it works fine again. What should I be looking for? It has an Alltek MPU board. Thank you.
Play it until it stops working. Peek in the door and see if the plunger is stuck up in the coil. If you can't see it thru the door, gently raise the field enough to get your eyes on that coil. If the plunger is stuck in the coil, turn the game off and see if it drops back down. Then replace the driver tranny.
If the plunger is at rest, lift the plunger enough to get a rag moistened with Goo-Gone in there to clean the rubber stopper. If there is no stopper order replacements. Retest. If it works, stop here. If it still doesn't work...
Go up in the head and find the chime driver tranny. Connect a jumper to the braid in the head (should be a stud in the middle of the bottom of the head) and quickly tap the tab of the driver. There will be sparks. This is normal. Does the chime sound? If yes, replace driver tranny. If no...
Get your meter out and set to 200VDC. Black lead on cabinet ground braid, red lead on each lug of the coil in turn. Should see solenoid voltage on both.
That gets you started...
Thank you for the info. I made a small mistake. It's actually the 10,000 chime. It's the one that's by itself. I don't have a schematic. The 10,000 pt chime is solenoid 6. Would that correspond to transistor Q6?
Quoted from phillyfan64:Thank you for the info. I made a small mistake. It's actually the 10,000 chime. It's the one that's by itself. I don't have a schematic. The 10,000 pt chime is solenoid 6. Would that correspond to transistor Q6?
In stern world... yes. In Bally world.... no, they mixed it all up for some stupid reason.
http://www.pinwiki.com/wiki/index.php?title=Transistor_Mapping_for_Bally_Games
looks like the 10k chime is Q7 and connector J2-12. look for cracked solder joints. The transistors hang off the pcb and the solder can crack like header pins will.
Quoted from barakandl:In stern world... yes. In Bally world.... no, they mixed it all up for some stupid reason.
http://www.pinwiki.com/wiki/index.php?title=Transistor_Mapping_for_Bally_Games
looks like the 10k chime is Q7 and connector J2-12. look for cracked solder joints. The transistors hang off the pcb and the solder can crack like header pins will.
Great info. Thanks guys.
Following the troubleshooting steps above it appears to be a bad transistor. However I decided to sort of bulletproof the game and replace the old board with an Alltek solenoid driver board. I know it's overkill but the game already has an Alltek MPU and lamp driver board. I figure this should prevent a lot of issues down the road. Thanks guys.
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Monroe Township, NJ