(Topic ID: 134470)

Tommy blinder servo from Marco


By schudel5

4 years ago



Topic Stats

  • 9 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by bob_e
  • Topic is favorited by 3 Pinsiders

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#1 4 years ago

http://www.marcospecialties.com/pinball-parts/041-5032-00

If you buy this servo from Marco for the Tommy blinders, there are several things you'll need to do to get it to work in the game. It's definitely a nice servo as it has brass gears with bearing guides instead of plastic. Should last a long time.

First, as Marco's website states, you'll have to swap a couple connector wires. It comes in the package with the wires in the connector as brown-red-yellow. The brown and red wires in the small black connector housing will need to be swapped. So when looking at it from left to right it will be red-brown-yellow. Leave the yellow wire as is. The red wire goes on the left side of the board. Should be a red stripe painted on the board for reference. Red is +5V, brown is ground and yellow is signal.

Secondly, this servo spins the wrong direction. When connected it spins clockwise rather than counterclockwise. You want it to spin counterclockwise. In order to reverse the direction to get it to spin counterclockwise, you'll need to open the case up by removing the 4 screws. The back and front of the case come off. Be careful on the gear side as the gears can fall out.

Pull the circuit board out and pull the motor out with pliers. The motor is held in with white caulk but comes straight out. Also down in the case is a potentiometer. It's held in with a tiny Philips screw. Remove the screw and pull the potentiometer out. Be careful not to turn the knob once removed. The potentiometer knob is indexed and fits into a slot in a gear. You'll see when you remove the potentiometer.

In order to reverse the servo, swap the two motor leads on the circuit board. Also, swap the two outside leads on the potentiometer. You'll need to do this with a soldering iron. The board, pads and wires are small so be aware and be careful.

Once done, reinstall the potentiometer and screw. Remember to index the potentiometer. The knob fits into the gear slot. Reinsert the motor. You may need to jiggle the gears to get the pinion to index into the drive gear.

Install the circuit board, front and back case and 4 screws. Connect to the servo board and test under diagnostics.

When installing the blinder arm back on the servo, use the silver metal machine screw that comes with the new servo and not the black wood screw from the old servo.

Just an FYI, make sure connector J2 on the shaker board inside the cabinet below the left flipper switches is disconnected or the servo will never work. Leave this connector permanently disconnected.

#2 4 years ago

Take a look at Frank from TNT's board replacement.

#3 4 years ago
Quoted from VacFink:

Take a look at Frank from TNT's board replacement.

There are lots of replacement boards available, but none will allow you to reverse the servo rotation direction.

If the original servo gears are stripped, you'll be replacing the servo. If you buy the one from Marco (or several others available) you may need to reverse the servo rotation. Most RC controllers have a reverse bias switch to do this easily. Since the original or replacement boards do not have that switch you'll have to do it physically inside the servo. The two pots on the board are simply trim pots to adjust the open close positions.

#4 4 years ago
Quoted from schudel5:

There are lots of replacement boards available, but none will allow you to reverse the servo rotation direction.
If the original servo gears are stripped, you'll be replacing the servo. If you buy the one from Marco (or several others available) you may need to reverse the servo rotation. Most RC controllers have a reverse bias switch to do this easily. Since the original or replacement boards do not have that switch you'll have to do it physically inside the servo. The two pots on the board are simply trim pots to adjust the open close positions.

This one allows to reverse direction by a switch viy software.

https://pinside.com/pinball/forum/topic/tommy-blinder-servo-board-pic-controlled#post-899771

The project was a bit sleeping, but will be ready in a few months finally.

#5 4 years ago

So you'd need a PIC programmer and software in order to reprogram the chip? Might be nice to include a PIC for CW and another for CCW programs in case you wanted to use an off the shelf servo that's CW. Not everyone has access or knows how to use a PIC programmer.

I like that you've included two different servo pinouts so you don't have to swap wires in the connector. Smart.

#6 4 years ago
Quoted from schudel5:

So you'd need a PIC programmer and software in order to reprogram the chip? Might be nice to include a PIC for CW and another for CCW programs in case you wanted to use an off the shelf servo that's CW. Not everyone has access or knows how to use a PIC programmer.
I like that you've included two different servo pinouts so you don't have to swap wires in the connector. Smart.

You do not need a PIC programmer. You simply switch the little red switch, the rest makes the PIC ...

We are still working with the problem, that the blinder at the end position pops a bit against the end, he should do it gently and caressing - we work on it and fasten our efforts now in the hope, to show a video very soon ...

#7 4 years ago
Quoted from german-pinball:

You do not need a PIC programmer. You simply switch the little red switch, the rest makes the PIC ...
We are still working with the problem, that the blinder at the end position pops a bit against the end, he should do it gently and caressing - we work on it and fasten our efforts now in the hope, to show a video very soon ...

Nice. I missed the switch in your thread and misinterpreted what you meant by switch via software. Looks good and a better solution than all the other replacement boards I've seen.

#8 4 years ago

Just an FYI on this subject. An Airtronics 94102Z is a CCW rotating servo. You still have to swap two wires on the connector. The connector comes black-red-blue from left to right. You have to swap the black and red wires so it ends up red-black-blue from left to right. The blue wire stays as is. red = +5V, black = gnd. blue = signal.

It's definitely easier and cheaper to go this route. You can get the entire servo and mounting hardware for around $18 online.

4 months later
#9 4 years ago

When you buy a new Airtronics servo for R/C use, the output shaft has splines. The Data East arm does not have splines it has a hexagonal socket to mate with original servo that was special ordered from Airtronics.

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