(Topic ID: 278177)

EBD Drop Target Problems

By prenfrow01

1 year ago


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  • Latest reply 1 year ago by prenfrow01
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#1 1 year ago

I just purchased an EBD and some of the drop targets are not reseting between players. When I do the solenoid test, 5 of the 7 memory solenoids are not firing. I removed the case holding them and the wiring looks strange. Can someone tell me if it's wired correctly? The two with the sloppy soldering on the end are the two that are working.

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#2 1 year ago

I'm assuming 5-7 are not firing to drop the targets?

#3 1 year ago

one and two are he only ones firing.

#4 1 year ago

If you have a manual turn it to the solenoid driver schematic. Then look at connector j5.

#5 1 year ago

These era games have issues with flaky connections on the circuit boards in the back box. That is where I would start.

#6 1 year ago

I checked the connections and everything looked good. So, I swapped out boards with my mr&mrs pac-man and same results.

#7 1 year ago

Looks like this wire isn’t connected

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#8 1 year ago

What is going on with those diodes? And the poster above nailed it - you have a wire off.

#9 1 year ago

Here’s some pics from my EBD Limited.
Hope these help.

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#10 1 year ago

I know it looks like there is a wire off, but it's actually attached to the diode on the underside (see pic). The strange thing is the two with the jacked up diodes are the only two firing.

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#11 1 year ago

The black wires that are strung together across the five solenoids are the constant “supply” voltage. Should be approximately 43 volts dc. The other wire connected to solenoid , each of which has an individual color code, I term the “control” wire And they individually go back to the solenoid driver board. The control wires are what energize the solenoid. When the solenoid is in the de energized position ( shelf state), the control wires do not go to ground. At this point there should approximately 43 volts dc across the individual solenoid terminals. When the solenoid is to be energized , the control wire goes to ground via the transistors on the solenoid driver board. There is now a current path from the constant supply voltage wires , thru the solenoid coil, thru the control wire , to ground via the solenoid driver card. The solenoid should “fire” and reset the target.

There are three possible problems. No constant voltage , burnt up solenoid coils and no ground path.

You need a multi meter and a jumper wire to trouble shoot.

1) with the game turned on, carefully see if you have 43 volts dc across the terminals of the individual coils with the multi meter. Touch the red multi meter test probe to the supply terminal and touch the black test probe to the control terminal . Since all 5 do not work, most likely all 5 either have or do not have the 43 volts. If no voltage. , need to trace back and find were the disconnect could be. Could be a connector , broken wire, bad board connection, or a board supply problem.

2). If you have the 43 Volts to each coil, Then the supply is good. I would next try to fire each coil. Take the jumper wire and touch the terminal the control wire is attached to ( do not touch the supply voltage terminal) with one end of the jumper wire . Quickly touch the other end of the jumper wire to a known ground. If the solenoid is good, the solenoid will fire. If the solenoid is bad, then nothing will happen. Nothing happens. Need to order new solenoids. If solenoids work, then for some reason the solenoid control wires are not going to ground. I would check the connector at the solenoid driver board or could be problems with the board itself.

#12 1 year ago
Quoted from pintechev:

What is going on with those diodes?

To drop targets 1 and 2, the extra diode is needed because those 2 targets (and only those 2) are on the solenoid expanded circuit. Without the extra diode, it would activate other solenoids when fired. Good thing those 2 work because the expanded solenoids are harder to diagnose and fix.

Since all 5 do not work, there's bound to be a break in the solenoid supply daisy chained wire would be my first line of diagnosis.

Start with what sulli10 says.

#13 1 year ago

Re reading your post. The five solenoids with the five black wires tied together have one source of supply voltage. The two solenoids that you do have firing have a different source. As I recall the , the source voltage for the two solenoids is the same same source as the two larger solenoids that reset the entire 7 drop targets via the mechanical reset. You can tell by the same wire colors on all four. For what it is worth the two solenoids that you do have firing have two diodes per solenoid coil. Versus the other five only have one diode per solenoid coil.

#14 1 year ago
Quoted from slochar:

To drop targets 1 and 2, the extra diode is needed because those 2 targets (and only those 2) are on the solenoid expanded circuit. Without the extra diode, it would activate other solenoids when fired. Good thing those 2 work because the expanded solenoids are harder to diagnose and fix.
Since all 5 do not work, there's bound to be a break in the solenoid supply daisy chained wire would be my first line of diagnosis.
Start with what sulli10 says.

Since all 5 do not work, I agree, most likely a common connection issue. My last game however, all 5 did not work because some of the five black supply wires rubbed against the control wire terminals and lost insulation. Went to ground and the solenoid coils ( or diodes I guess) were failed. Had to order ew coils

#15 1 year ago

Thanks everyone for all the help! I will dig out my volt meter and see what's going on.

#16 1 year ago

The problem has been resolved! I traced the power wire back and found that the solder joint had broken and the wire was hanging. I soldered it back and everything is working! Thanks again for the help, much appreciated!!

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