(Topic ID: 81394)

78 Bally Playboy issue.... HELP!

By REMPins

10 years ago

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4 posts
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Latest reply 10 years ago by ChrisM
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Linked Games

Playboy Bally, 1978

Bally Playboy continued:
Got my rebuilt MPU and put it in today, boots up fine.... I get the 7-flashes but no tune/sound... is this a sound issue ??
Took the only fully working display and put it in Position-1, game starts but still... no sound, ball doesn't kick out and no other solenoids working, manually checked Solenoid Driver board, did the ground test to the collectors and most engaged a Solenoid and the relay on the board engaged as well but didn't get a reaction from all the collectors, is this normal ??
I tried the self test switch on the coin door and nothing, pushed once, then twice, then three times and so on and still nothing, the only thing that did happen is a few of the bulbs under the playfield flashed dimly ??
I need help to figure this one out.

REMPins:

The sound board either needs a recap (always recommended), and/or the 555 or LM380 are bad. Possibly the ROM at the upper left of the board, but not likely. Also check solder joints.

Sounds like the 43V is OK for your solenoids. make sure you check AL fuses, especially if there is one under the playfield. Possible reasons that MPU wil not communicate to solenoid driver include:

1) If your original MPU was very, very damaged, and battery crud got into the connector at the lower left of the MPU, this will cause solenoid issues
2) Be sure on the solenoid driver board to check al the solder joints. Cracked solder joints are common and problematic.
3) The small pinned connectors at the right of the solenoid driver MUST be clean - use a fine (320-400 grit) sandpaper to clean them off. This is your communication point to the SDB.
4) The solenoid driver REALLY should be checked/ground upgraded/fresh 5V recapped

Those are the significant items that come to mind at this point. Your replacement/rebuilt MPU was play tested with 2732 ROMS in my EBD, and validated on the Bally tester, so for those unaware who read here and wish to add, know that the MPU has been properly serviced and can be ruled out as problematic.

Chris

The voltage on both boards at each TP was good.
I'm getting a complete rebuild kit for the Voltage Regulator..... the 20-header pin and connector are burn't and the resistors are getting excessively hot so I'm rebuilding and upgrading the board. Meanwhile I'll get a recap kit for the sound board.

On the Solenoid Driver should I get a response from each transistors collector doing the ground test.

Good, voltage supplies on those early games are usually in very bad shape from sitting for hours on end powered up which generates a lot of heat. More heat = more resistance = more heat, a deadly cycle.

Recap on the sound board MAY fix your issues, if not, let me know.

Yes, you should get a response from each transistor on the SDB. If you don't, it can be a bad transistor - not uncommon.

Chris

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