embryon single drop target resetting to quick

[pinball god]

Don't know much about drop targets but this one has me. What's supposed to happen is knock down the target and then score the award when you hit the captive ball against a standup target.

Currently 95% of the time you drop the target and within a few seconds it resets without hitting the captive ball/red target. All sounds activate like the red target has been hit

Checked the leaf switch is opened when target dropped. Standup I think works as when in switch test, 17 comes up when target dropped and remains until standup activated giving zero.

I though the leaf switch have been the problem but don't think so. Any ideas guys?

[Strangeways]

The vibration of the DT hitting the baseplate is enough to trigger the standup switch. Adjust the standup switch. For testing place a piece of paper keeping the stand up switch open. Also check to see if the tabs on the switch are not touching, and if there is a capacitor on this switch, it could be intermittently shorting.

[pinball god]

Thanks mate, this stand up is different in functionality. It is normally closed and when hit the switch blades open up. Also there is no diode or cap. That's why I'm a little stumped. I too thought as you initially and raced to fix it 

[LittleSilverBall]

Hi Pinball G,
Try going to Diagnostics and running through the switch tests, you could have a shorted/dead diode which may trigger 2 switches at once.
print out the switch matrix and run through each and tick it off.
if you find that more than 1 come on at a time I can assist. if all ok try the switch edge test and tune each of the drop target leafs and the stand up leaf also.

[pinball god]

Hi Pinball G,
Try going to Diagnostics and running through the switch tests, you could have a shorted/dead diode which may trigger 2 switches at once.
print out the switch matrix and run through each and tick it off.
if you find that more than 1 come on at a time I can assist. if all ok try the switch edge test and tune each of the drop target leafs and the stand up leaf also.

thanks mate for the offer. Unsure about your advice. This is a 1980 game and I'm only aware of one test I can do which is like a switch edge test. I did try all switches and the work ok although the rhs standup has a switch value but the target in question has a switch value of zero. So if I drop the drop target it gives a reading and then when I activate the standup, it gives zero.

My problem is a little intermittent, you can drop the  drop target and a phantom standup activation my take place in a second or after a minute or two or maybe never  as you can lose the ball. I have repeated hit the right flipper and t may activate which is the only time I can say a device may have attributed, but then maybe its vibration??? I'm really unsure on this one.

[LittleSilverBall]

Hey,
My apology I should have read the game specs :)
as usual Nino is probably on the money Re the vibration and switches.
couple of questions though,
1) which one is this left or right?
2) does the function work properly on the other drop/captive ball?
3) did you try putting the paper/cardboard in the captive ball target switch?
4) oh and did your game reset to defaults recently?

[pinball god]

Right target
Works great on all other captives
Didn't try the paper as switch is activated when contacts open so don't know if applicable
No resets at all

Hope this helps with any ideas

[Ballywannabe]

One thing you could try is to 'jumper' the switch legs with a piece of wire.  Then drop the target and see what happens.  If it resets I would suspect a switch matrix issue, if not, then it would almost certainly be a faulty switch.

cheers
Ian

[pinball god]

One thing you could try is to 'jumper' the switch legs with a piece of wire.  Then drop the target and see what happens.  If it resets I would suspect a switch matrix issue, if not, then it would almost certainly be a faulty switch.

cheers
Ian

if its a switch matrix problem, does that mean a pcb problem and if so what part of it and can it be repaired easily? thanks

[Ballywannabe]

See if it is the switch first - would seem the most likely and easiest to fix.  Switch matrix problems can be caused by faulty diodes on the same strobe/return as the switch giving trouble - can be hard to track down.  Could possibly be the CPU, easiest way to check is to borrow an Alltek (switch adjustable for all Bally games) CPU off someone and give it a try.

[pinball god]

Update, unsure if this could be the cause of my target problem, but I replaced the under playfield fuse holder (thanks to Nino for the part) that was being held together with some insulation tape. Could a loose fuse cause strange things to happen?

Otherwise had two great games tonight and will see how the next games go in the future.

Btw its not a great idea touching the two contacts on a coil with your wedding ring while the game is on. Scares the hell out of you and makes inserting leds difficult 

[Ballywannabe]

Almost certainly no - the fuse is part of a different circuit.  I suspect the most likely cause is an intermittent break in the switch from vibration.  If it starts doing it again, jumper the solder lugs on the switch and see what happens.

[pinball god]

Thanks mate

[pinballmedic]

I cant recall ever seeing normally closed targets on a bally or most other makes for that matter, I would say change the target to a normally open one that closes on being hit and see how that goes and remove or replace caps on bumper switches.

[pinball god]

Thanks, problem seems to have sorted itself out. I forget what I did unfortunately but the target switch is normally closed as per the manual