Flipper - false triggering some sounds ????

[Marty Machine]

Hi All.

My left Flipper (Stellar Wars) seems to trigger the soundboard fx almost everytime.
It seems the flipper switch? or solenoid coil/dead diode? is creating a spike somewhere that upsets the soundboard and generates the odd ding/boing fx.

Any ideas?
Marty.

[Strangeways]

The old "ghost switch" - Try tapping the playfield in the lower left hand side of the playfield.. Could be a switch that is adjusted too close ?

does the score increase ?

[Marty Machine]

No, i've looked at the flipper switch, there's a healthy gap there.
It's not triggered by tapping the cabinet or anything microphonic like that, it's ONLY when pressing the left-flipper button.

Also, it's not the same sound each time, there's a variety of boings/dings and even the odd explosion is triggered too.
I imagine there's a common supply rail that the flipper coil is spiking.

Thanx,
Marty

[markc]

hey Marty

you still working on it I see
how did that playfield go ?

your manuals  will be at work monday for collection too


thanks

mark

[Marty Machine]

Howdy Mark,

Yep, always tinkering with Stellar Wars, gradually ironing her out....

That other playfield is being sorted, chucking the junky bits and cleaning the usable bits, should be a good start for the "project pin".

It also helps see how everything's mounted, before i open a can'o'worms with Stellar mods. 

Seeya Monday for the manuals, and probably seeya tuesday if you still need more hands for container-day.

Thanx,
Marty.

[markc]

no worries mate

the more thans the better  re container     you will upset a few if you come and help
a few boys here would love to come .....


i will post here and confirm tuesday  once i have a time booked in


mark


ps  you have opened a can of worms already  but i am sure you will get plently of help here

[Marty Machine]

Thanx Mark, keep me posted.

MY next purchase is a *BIG* can of worm food 

Marty.

[Strangeways]

GI issues and a phantom sound triggered by a flipper button...

Sounds like a Grounding problem.

Stupid Question #1 - There's a Earth strap that connects from the body, and is fixed to the earth point on the head. Male sure this is connected properly.

Check the connectors throughout the machine - maybe refit all of them..

[Marty Machine]

The sound trigger is hairy, i checked the grounding straps, all in tact, all measure .000001 ohms back to earth point.

The sound trigger is also triggering the normal (bell/chime) sounds when in fact the rom is in "synth" mode.
I manually flick every switch on the playfield and can't find the same sound that the flipper triggers, but when i switch the soundcard into normal mode (not synth) i hear the same sounsd on various targets etc.

weird.
Marty.

[Retropin]

Check the ground on the sound board itself, even running  an extra ground from the board to ground strap.
Tey this in flipper ground also.

Im inclined to agree - youve got a little spike from the flipper which is triggering a sound. One of these has an indirect path to ground

[Marty Machine]

hehehehe, i guarantee i won't forget this one, once i solve it   

[Marty Machine]

Damn! Doh! and everything else.

I discovered today that the Right flipper switch has a 0.1uF greencap (supression) across it, and the Left flipper doesn't.
I added a 0.1uF onto the left flipper switch and Tah-bloody-Daaah ! it's now silent!
No more false triggered sounds anymore.

It's reduced from 9/10 false triggers to 0/10 when hitting the flipper switch constanly for 10-20secs or upto 1 minute.

Yay Yippeee   

The caps aren't shown in the manual, i can only guess this was a mod from previous owner(s) ???

I won't forget this in a hurry ;-)

Thanx for everyone's input anyway.....
Marty

[Strangeways]

Good stuff Marty.. I don't have any on my Flash, so I was stumped myself !

 

[Marty Machine]

Yep, it's hard to trace components that aren't in the manual.

I guess it always pays to snoop around inside the machine, looking for mods and nasties lurking ;-)

p.s. the machine is still quiet