(Topic ID: 98500)

Data East Left Flipper Sticking

By Crash

6 years ago

Topic Stats

  • 6 posts
  • 2 Pinsiders participating
  • Latest reply 6 years ago by RussMyers
  • Topic is favorited by 1 Pinsider


Linked Games

#1 6 years ago

I have a Lethal Weapon 3 (Data East system 3) with a sticking flipper. When I press the left flipper button the flipper fires, but sticks up. The hold circuit stays energized after I release the button. It drops when I turn off the power so it's not a mechanical bind. I swapped the flipper PCB under the playfield with another one and it does the same thing. Which area/components of the driver board do I need to check? I also verified it's not a switch matrix issue (left flipper stops registering when I release the button which is normal).

#2 6 years ago

The diode on that coil is bad, missing, or broken at one lug.

That's typical behavior for DE when the coil diode has a problem.


#3 6 years ago

Not sure I follow you, are you saying an open diode may have caused the 9v transistor on the driver board to fail?

#4 6 years ago

No, that's not what I'm saying.

On DE games with the Deger flipper board, if the diode on the flipper coil is broken, you can get the symtoms you describe. Try replacing the diode on the flipper coil.

From here: http://techniek.flipperwinkel.nl/desega/index2.htm#flip0

"Flipper Gets Stuck in the Up Position...
Before proceeding with repair, first determine if the stuck flipper is a mechanical or electrical problem. If the flipper is stuck in the "up" position, turn the game off. Does the flipper return to its normal "down" position? If so, the problem is electrical. Otherwise if the flipper stays up even when the game is turned off, then the problem is mechanical.

Electrical: On Deger (Playboy, Monday Night Football) and solidstate flipper games (Robocop and later), check the flipper coil diode. If the flipper coil diode is broken or shorted on, the flipper coil will stay energized after using it. Replace this diode with a new 1N4004 or 1N4007 diode. The counter EMF (Electro-Motive Force) produced by the magnetic field in the coil collapsing is a reverse polarity voltage. This reverse polarity voltage can cause damage to the flipper board. In most cases, it will gate the SCR (Silicon Controlled Rectifier) in the holding voltage circuit, causing the flipper to remain energized as if the player was holding the cabinet flipper button in. This was mentioned in service bulletin number 58. "


#5 6 years ago

Yep that was it. Diode fixed it. Thanks!

#6 6 years ago

Excellent. Good job fixing it.


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