(Topic ID: 162836)

Lethal Weapon 3 Flipper Fuse Issue

By jgruiz75

8 years ago



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#1 8 years ago

I can't seem to troubleshoot my issue. My output fuse for my left flipper on the Data East Solid State Flipper Board keeps blowing (the coil never fires). I thought it may be the coil because I disconnected the coil and the fuse didn't blow so I replaced it and right after I push left flipper button, the fuse blows. The leds on the board are lighting up indicating that it is getting the response from the trigger. Any ideas on what can be causing this?

Thanks!
Jaime

#2 8 years ago

Is the transistor blown? Your meter is your best friend.

#3 8 years ago

There is an SCR and a TIP-36 (IIRC) on the flipper board that is screwed to the left side of the cabinet. There is a pair of these for each flipper circuit. Use your DMM set to diode test to test each of them, comparing results to the "good" lane.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#4 8 years ago

Thanks for both of your quick replies. Chris I tested the TIP-36s and came across some weird stuff Q10 (see pic) is a TIP36C and Q9 a TIP 32D. Both had different voltages when comparing to the other lane (both seem shorted, i.e. went down to 0) Also, I noticed that the diode in D6 also seems to out as well as my meter goes down to 0 in both directions. So it looks like at least Q9, Q10 and the diode need to be replaced. The question now is, is this board easy to refurbish by de-soldering or should I just be looking to replace the whole board?

2016-06-25_19.27.34_(resized).jpg2016-06-25_19.27.34_(resized).jpg

#5 8 years ago

If you've nailed it, and it's tough to tell, it's an easy board to repair given that it's single sided. I'd take a crack at repairing it. I always prefer OEM boards when possible although the RD replacement for this board is fine.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#6 8 years ago

While you're at it, after you put the fuses back in, give them a nice downward push just to make sure they're still good. Those Data East fuse clips love to go bad and give way. Cheap fix and very problematic, might as well do it all while its out.

#7 8 years ago

I am having the same issue....It was working great, coils had got to the point the sleaves would not come out but the game played fine...went to change out coils with new ones, did not notice diodes were on the new coils opposite the old ones, hooked up blew both flipper fueses. fixed issue right flipper works perfect left one blows fuse everytime. replaced with the old coil and same result.

#8 8 years ago
Quoted from mainelycoasters:

I am having the same issue....It was working great, coils had got to the point the sleaves would not come out but the game played fine...went to change out coils with new ones, did not notice diodes were on the new coils opposite the old ones, hooked up blew both flipper fueses. fixed issue right flipper works perfect left one blows fuse everytime. replaced with the old coil and same result.

You guys may have diodes backwards on these coils, but the wiring in relation to the diode is crucial. If your power wire is reversed, then thats kablooey. So, you may have turned the diodes back to the way they were or got the wire orientation right as of now, but you have damage further upstream in the actual transistor that fires the flipper(s). So, until you fix the blown transistor (check your flipper board transistors with a meter) then you will continue to keep blowing fuses and it will never work.

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