Williams Flintstones Flash Lamp circuit

dandydan1959

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Hi,

I have a Williams Flintstones that blows C11 on the driver board which is in the flash lamp power circuit. This game has done this twice. It does not blow the fuse F111 associated with that circuit. J107 pin 6 and J106 pin 5 are not shorted to ground. Let me know if you have seen this before.
Thanks
Dan
 
check D's,11,12,13,14, and if C12 is bad, C11 is doing all the work, caps in parrell add up thier values, like resistors in series do.
 
Update

Hi,

Replaced C11 on the power driver board. Placed back in to the machine and did not connect J106 or J107 which is the playfield and backbox voltage outputs to the lamps and solenoids. The power at the board on J107 pin 6 was a solid 21.0 Volts. I shut down the machine and placed J106 back on and the ps voltage was still 21 volts. The next step was to connect J107 which I did and the voltage jumped up to 47 volts. I quickly shut down the machine and pulled J107 off and the voltage returned to 21. The next step I followed was to remove the wire on J107 pin 6. The results were that the voltage returned to 21 volts. I measured the voltage on the wire I removed from J107 pin 6 and it was 74 volts with the wire disconnected which is 50 volts unregulated. I came to the conclusion that there had to be a short between the 50 volt circuit and the 2o volt circuit on the playfield.

I forgot to mention that this machine belongs to a fellow enthusiast and he said it was working when he purchased it. At this point memories of the days when I worked in the industry came flooding back. I worked on countless games that the owners said that they worked and then quit and then later found out that they moved them and crossed plugs when reassembling them or they attempted a repair.

I am older and rusty so things are just coming to life but slowly so I worked around the playfield and found that all of the playfield flashlamps were blown also possibly indicating a over voltage situation. The real indicator of the issue was that some of the solenoid select lines which are brown in color with stripes on this game have 20 volts on them and with the machine turned off they are shorted to the flashlamp power supply. I was about fried on this so I quit last night at this point and came home. Looking at the schematic last night I realized that the only way this could happen is to have crossed connectors on the power driver board for solenoid and flashlamps. I have not proven this yet since my friend is not at home but I know this has to be the case because the only way to get the two sources crossed is to cross these plugs.
Other indicators were sling shots weak, some playfield lamps were not on despite having been replaced and left ball divertor and stuck on.

I will update you all once I get this resolved.

By the way "It was working and then quit". "I didn't do anything", "I bought it and it was working according the guy I bought it from" are all indicators to stop and check the connections.
thanks
Dan
 
found it

Hi guys,

J124 was plugged in to J128. J128 is not used on this game. Moved back to J124 and everything is back to normal. I am glad I checked the voltage as I powered up the game or I would have fried another C11. Lesson to me any anyone else reading this post is to check the connections even when it was working and quit.
Thanks
Dan
 
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