(Topic ID: 144862)

Strange Behaviour in 8BD

By leaffan67

6 years ago


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  • 17 posts
  • 7 Pinsiders participating
  • Latest reply 6 years ago by leaffan67
  • Topic is favorited by 3 Pinsiders

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#1 6 years ago

Hi All. Just now (happened twice) I knocked down several of the bonus multiplier drops, then hit the A,B and C lanes which (correctly) drops two of the pool ball drops on the rt side. However, it also reset the bonus multiplier drops. I was on 3x. Suddenly, I have to do 2x and 3x again just to get to 4x! Surely this isn't correct behaviour. Any ideas?
thx in advance, Dave

#2 6 years ago

Bueller?

#3 6 years ago

Enter test mode and step to solenoid test. Let it cycle through a couple of times following along in the manual. Make sure all the correct #s are displayed for the solenoid in action.

Then go into switch test (ball out of game, all targets up) and drop the multiplier targets one at a time and make sure the correct # is displayed for them as well.

Also, the solenoids driven by the Solenoid Expander Board should have two diodes affixed to their lugs. If one-diode coils are fitted at those designations, very weird solenoid behavior ensues.

#4 6 years ago

Roger that last bit Cody. A one diode coil in a Medusa had me going in circles.

#5 6 years ago

thank you! will do and report back!

1 week later
#6 6 years ago

Would anyone be so generous as to provide a photo of the wiring for the right side drop target bank showing the double diodes and the wiring to the solenoid lugs? Please and thank you. It appears I have a "hacked" drop bank. strange that it worked properly for years before this problem started....

#7 6 years ago

What was the result of the solenoid test? Did everything fire properly? Any switch errors?

#8 6 years ago

Yes, all the solenoids fired properly. However, when the 2 ball solenoid fired, it also reset the bonus multiplier drops.

#9 6 years ago

Sorry, mine is currently folded up. If you still need one this weekend I could probably get you one.

#10 6 years ago

it would really help me to have a couple of photos. two of the rt bank solenoids have double diodes and the other 5 don't. I think there is some strange wiring too.

#11 6 years ago
Quoted from leaffan67:

Would anyone be so generous as to provide a photo of the wiring for the right side drop target bank showing the double diodes and the wiring to the solenoid lugs? Please and thank you. It appears I have a "hacked" drop bank. strange that it worked properly for years before this problem started....

My EBD is currently staying with a friend. I had trouble sorting out solenoid issues (ended up being a failed solder joint.)

Solenoids 1 and 2 had two diodes, whereas the rest had one.

#12 6 years ago

on mine only 6 and 7 have two diodes.

#13 6 years ago

The coils that should have two diodes are:

7-drop target bank reset
8 ball saucer
1 ball
2 ball
Multiplier drop bank reset
Outhole

If the saucer or multiplier bank or outhole coils don't have two diodes, the multipliers will reset every time the game drops the 2 ball (via A-B-C-D).

#14 6 years ago

If you still need pictures let me know. I have two complete (and fully-functional) EBD assemblies that are out of machines that I can sit on my bench and take pictures for you. One assembly is the early Bally design and the other is the final Bally/Midway design. They are both the same except for the connectors.

#15 6 years ago

Yes pictures please!

1 week later
#16 6 years ago

Alright, since you say you have the 3rd edition with the under playfield circuit boards with twist-in lamp sockets, I took some pictures of the same version drop target assembly. The two versions are basically the same except the 2nd version includes a connector and can be easily unplugged where the switches on the older version are hard wired. The 2nd version also has a plate that allows you to adjust the target height with sheet metal "fingers" between the targets to prevent the ball from hanging-up.

This is a fully-rebuilt and tested assembly and I think this is the view you are looking for (click on it to enlarge and then click again to zoom-in):

IMG_2450.JPG

#17 6 years ago

Yes that photo should help a lot! Thx!

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