I'm new here and hope I post in the right forum!

I bought my JM for one year ago everything worked fine (even the hand), but now suddenly the hand have stopped working. This pin is really a favorite so it must be fixed!
I have read "all posts" regading hand issues but I cant find my problem anywhere so I hope someone out there have seen this behaviour before....

It started with the error msg Hand mechanism Y- no progress.
So I checked the magnet and the wires was partly burned so replaced them and thought this woud fix it, but not!
The hand works fine in both X and Y directions when running the selftests, but when I press the blue flipper buttons (Y-directions forward/back) then the hand immidiatly seems to "hang" and stops working.

If I reset the hand by doing a hand test, JM boots up normally without any error msg.
But as soon as the ball gets into the hand and I try to move the hand (by the flipper buttons) in any Y direction the hand stops!
It cant be a wire issue as the hand works when JM runs the hand, must be something else....?

- All switches (X, Y & hand) and the four photo couplers have been checked and they all works.
- I have resolder the Dual relay motor driver board, back of the playfield.
- The magnet works and holds the ball.
- All connectors near the hand have been reseated.
- The both drive nuts/screws seems not to be worn at all.

Dont know where to search anymore and where to look!
Can anyone give some advice, Thanks!

Yes and yes, the glove stops working entirly when hitting any Y button.

I will check the blue flipper button, might be a bad button as you mention!

My first though was that the dual relay board under the playfield was causing this with a bad soldering.
But the glove works fine when running the handtest, shouldn't the signals from the Y buttons go the same way (thru the same relay board)?

Just thinking....could a broken diode on the Y button cause this issue?

All switches (buttons) have now been checked and works fine, so the issue can not to be found there!

I have also looked a little bit closer to the glove's magnet.
The magnet catches the ball and keeps it as long as the X-motor runs (or the X-buttons are activated)
But if I touch the Y-button the magnet immediately dropps the ball, the X motor stops and the Y motor
never starts.
Earlier I assumed that the Y movement stopped as I touched the Y-buttons, but it might be that the ball dropps out from the magnet first, and because of that, the X & Y motors also stops (as the machine expects a ball in the glove to run the motors)

What can cause the magnet to loose it's power?
(The glove switch works, there are new and thicker leaders)

Just guessing now:
Could it be a voltage drop to the magnet when the motor starts to build up energy for thr movement?
Do these two have any common connection?

Edit:
I just did the T16 Hand Test.
Self Test =OK
Home= OK
Move= Failed, X motor works fine as always, but the Y motor doesnt move at all when pushing the Y-buttons.
I can hear the relay clicking so the signals from Y-buttons comes to the relay, but there it stops....

Today I removed the complete hand asm with it's motors and drivescrews.
When everything was out I started to check leader by leder with my multimeter.
And suddenly, there it was! A broken leader.
It was one of the the leaders to the Y motor, the insulation looked ok from outside, but inside the wire was broken.

I also found an issue with the drop down target (in front of the ball popper).
The switch could somtimes get stuck in it's bottom position. Maby this switch would affect the magnet to drop the ball.....??

So now Johnny is up again

Thanks all for the help!

No problem to remove the hand asm.
Just get a set of screwdrivers similar to this.
http://www.powerandmotoryacht.com/sites/default/files/pictures/1305/nut_drivers.jpg

You have to loose six screws, disconnect some (seven??) connectors, cut some straps, unsold (or cut) the wires to the right red flasher.
Then you can lift the asm out. Took me 15-20 minutes to remove it.
Take some photos before removing it so you know how to put it back and be careful when lifting the asm out so it want fall apart.