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overactive bony beast

unity_neil

unity_neil

Registered
10 Years
Joined
Oct 14, 2012
Messages
301
Location
Nuneaton
I've had my scared stiff for a few weeks now and I'm generally loving it. I've replaced a rollover switch for the centre deadhead and have kne to do for the left loop. But recently a couple of other oddities have popped up that really affect game play. Suddenly the bony beast loop keeps triggering which pushes scores way up and opens the ball lock divider all the time. Secondly the auto firer in the shooter lane keeps activating during play and finally the ball went in the spider hole earlier but wasn't detected until the ball search kicked in.does anyone have any suggestions on how to check these things? I've run a switch check and nothings flickering. I'm a bit stumped as I'm no pinball expert.
 
Yep - what @carl lawrence said.....and if you ever need to compare any work on your Scared Stiff you are welcome to visit mine as I have one too and you are not that far away from me...
 
After some more investigation the fault appears to be with the 2nd set of opts in the bony beast ramp. Wiggling the wire brought back the bong in the edge test. So now it's intermittent. Weirdly when the fault presents the game loses the ball.ball . somewhat randomly kicking off the ball search. Not acknowledging the ball going into the spider hole or plunging the spider hole with no ball present. I'm unsure how to proceed now. I could replace the wiring but how to do that and keep it looking original?any advice gratefully received. Thanks neil

P.s. sorry for the long post.
 
I have an update.i ve retested the game with the fault present. The option transmitter seems to be working. Pic attached. Blocking the light doesn't result in the switch actuating. However unplugging the cable connector under the playfield does. Does this mean that the opto receiver is suspect? It seems weird that the ramp end opto failing also affects the spider hole opto? Please help I'm going nuts over here. Ss is the only table I have being a relative newbie to pinball ownership. Lol
 

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Final update.built a test bulb and operated operated known good opto. The bony ramp opto doest activate. But here's the thing. If I measure the voltage across the receiver terminals it goes from almost 0 to 12v when the path is broken. I have been checking @Spandangler thread. Sorry for this ending up up a similar thread. Could this be the chip mentioned mentioned in that thread? The fault now seems permanent now. perhaps perhaps should call someone in now...
 
Ordered a pair of opto assys from Pinball Heaven. looks like the ramps have to come off to fit them though...<gulp>
 
Me again guys. I've replaced the opto and the fault remains the same. Doesn't recognise blocking the beam. But putting putting a meter across the receiver gives 12v wheb the beam is broken.does anyone have any further suggestions please?thanks kn advance.
 
Have to ask because it is so easily done , the led has a + and - side , is it fitted the correct why
round ?
Sorry for asking that !!
If all correct then it could be one of the chips on the opto board ( U1 U2 U3 U4 U5 ) look on the wiring diagram to see which one :( (I hate opto ,spot on when there are working and a pain the back side when not.)
 
carl lawrence said:
Have to ask because it is so easily done , the led has a + and - side , is it fitted the correct why
round ?
Sorry for asking that !!
If all correct then it could be one of the chips on the opto board ( U1 U2 U3 U4 U5 ) look on the wiring diagram to see which one :( (I hate opto ,spot on when there are working and a pain the back side when not.)
Click to expand...
no problem asking Carl.i bought the assemblies with the led wired in. I soldered the cables on the same way as they came off. So this should prevent the reversed led issue I read about on here
 
unity_neil said:
Me again guys. I've replaced the opto and the fault remains the same. Doesn't recognise blocking the beam. But putting putting a meter across the receiver gives 12v wheb the beam is broken.does anyone have any further suggestions please?thanks kn advance.
Click to expand...

Check you have the same 12v at the MPU when the beam is broken to rule out a broken wire. Then reflow the MPU connector pins and check the connector itself is good. Then follow the paths and check continuity from the connector to the LM339 that you think is faulty.
 
Merry Christmas fellow pinball freaks! Had a little play with my Christmas present yesterday and replaced all the lm339 chips on the opto board socketed them also. Thanks to pinball heaven for the quick pre Christmas delivery! Sadly the fault remains.we even bypassed the wiring from the opto to the under under playfield plug. We have cintinuity to the plug on the opto board. Next test is to check check for 12v at the board when the beam is broken. After that I'll have to try to get a friend over with his oscilloscope. Boy this is proving tough to trace. Hope you all had a great Christmas and got what you asked santa for. Happy new year too . neil
 
Closing this off now as it's fixed.thanks to all those who helped.the issue turned out to all be a dodgy connection on leaper 3. White wire. This was affecting the left ramade affnd spider hole opto for some reason. Weird.
 
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