Bugs Bunny Birthday Bash randomly "freezes"? any advice?

shawnbo42

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Bugs Bunny Birthday Bash randomly "freezes"? any advice?

Okay, here's the deal. I can't figure this for the life of me, and I'm hoping somebody around here can help. I believe it's a system 11b, what will happen is this.

You turn on the game. Everything is cool. It will credit, start, and play.

At ANY point during the game, the displays go dark, no more sound effects, if the ball goes into a hole or anywhere the ball is held, the solenoid will not kick it out. However, the music is still playing, and you can still hit the ball with the flippers all over the p/f.

Once the ball is locked in anywhere on the p/f, the game will just sit there indefinitely, playing the music until you turn off the machine. Once it is shut down and turned back on, it will kick the ball out of wherever it was hanging around at, and go back to the attract sequence. Once again, you can start a game, and play until the same thing happens. I am not really skilled at pin board diagnostics and repair, but I am competent to do so if I know what I'm looking at. Far as I can tell, all the voltages are okay, both a/c and d/c. Hoping someone around here can point me in the right direction to get this thing going. Thanks!
 
Yep power supply issue, so the reseating connectors probably won't help you. If it does then you probably have cracked solder joints on the back of the board which you will need to address.


Verify you have the +5 volts on the CPU board with the game in attract mode. Should be 4.9 volts to 5.2 volts DC.

Per Clay's sys 11 guide you can check the following:

Inspect every coil diode for cracks or loose/broken leads, especially the flipper coils.
Put the game in diagnostic switch test, and press all the playfield switches.

Make sure no one switch activates two switches (or more) on the score display during this test (indicating a switch matrix problem, which can slam tilt a game into a reset).

Check the power supply fuse holders F5 and F6. Sometimes these can tarnish or crack, or the fuses themselves can become resistive.

Replace the +5 volt filter capacitor C10 (18,000 mfd, 20 volts) on the power supply. These games are 15+ years old, and these filter capacitors have an approximate lifespan of about 10 years. So every system11 game is really due to have this capacitor replaced!

Replace the power supply capacitor at C8 (47 mfd, 50 volt). This cap often goes open and will cause a low +5 volts.

If the +5 volts is still low or the game is still resetting, replace the power supply bridge rectifier BR1. This is a 35 amp 200 volt lug lead bridge.

If the +5 volts is still low or the game is still resetting, replace the +5 volt Darlington transistor on the power supply at Q5 (2N6057, but replace with a 2N6059).

If the +5 volts is still low or the game is still resetting, replace the +5 volt regulator chip on the power supply at IC1 (MC1723C, also known as a 723C).

If the game is still resetting, look for cracked solder joints on the backs of the connector pins on all of the boards in backbox. This is a common problem and can cause reset as well.

The most likely connectors to cause reset problems are power supply connector 3J6 (power out) and CPU connectors 1J17 (power in). Resoldering these circuit board connectors.


Go through all of that and you should find it...
 
One more thing to check--make sure the game roms are securely seated in the sockets. GENTLY remove and replace them firmly. (Best to do this when the board is out to avoid flex.)
 
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