Game Over before Game Over

[millsy]

Well its about time to solve another EM problem everyone.
Millsys playing his Jumping Jack,finally getting a high score then  goes to GAME OVER.
There is only one common occurance when this happens that I have noticed - Seems to only occur when the ball hits the 100 point Pop Bumpers - Any theories.

[arcadoz]

First theory- check tilt switches, pop bumpers thump the playfield or thump the playfield yourself.
It probably won't be that but it is the easiest to check.
 

[The pinballist formally known as Dean Morgan]

Not enough clearance on the contacts of the Game Over Relay,  with impact of Pop Bumpers it makes? 

[Strangeways]

Not enough clearance on the contacts of the Game Over Relay,  with impact of Pop Bumpers it makes? 

That's my guess !

[millsy]

Checked the game over relay -checked out ok. As this relay is situated at the floor of the cab and not on the PF,I dont think the problem is movement related, I suspect something is activating this relay during play.
99% sure its related to the pop bumpers - maybe I disconnect the pop bumpers to be 100% sure. I did replace these bumpers with new coils - the new coils had resistors across both terminals (Refer Pict) the coils would only work if i disconnected these resistors - may be related ? Any thoughts on this theory?

[ajlaird]

Are you sure that is not a diode rather than a resistor?

[Mr Pinbologist]

Thats a diode and is definitely not a good thing to have on an EM coil

If the coils you used to replace the originals had these diodes on them when you got them, they must've been intended for a SS pin. You did the right thing to cut them as they would've been putting a short across the coil.

Just a thought... are the coils the same part number as the originals??

Cheers...Mitch

[millsy]

Just looking at the schematics - Looks like I have fitted A-1496 coils instead of A-1493. Could this be the problem ? ,maybe I will put the old coils back in and see what happens.

[Mr Pinbologist]

Worth a try for sure. I'm not sure but maybe the A-1496 may have lower resistance windings thatn the original coils 

If thats the case it could be causing the problem you're having

[Strangeways]

Put the original coils back in. A-1496 are a coil common in sys1 and sys80 machines. Diodes are there to protect the driver boards in DC circuits.

You can use A-1496 in an EM, but as you have found out - you need to remove the diode.

[millsy]

fitted old coils back -still resets to game over -definately only happens when pop bumpers activated -back to the drawing board.

[ddstoys]

Do you have a Slam switch on the playfield Kev?   Bumpers might be opening or closing that causing GAME OVER?

[millsy]

Problem solved (Daniel was close) 
Problem was at the slam switch connected to the start switch at the coin door (Refer Pict.) 
Also the diode fitted at the pop bumper coil is for DC Bumpers (Williams 1972 on,Bally 1975 on)
Millsy