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contact 3av head homing errors

Views: 2087

#62739

contact 3av head homing errors | 20 September, 2010

i have an old contact 3av pick and place machine that has started to display placement head position errors. the machine seems to start working if you switch it on and leave it for a couple of hours to warm up. has anybody had simillar issues with this particular model?, if so what was the solution.

regards darren

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#62768

contact 3av head homing errors | 23 September, 2010

I had 4 of these machines. They are good machines but I have seen this error often.

Is the problem only on one head L or R? If so swap electronics L to R and see if it follows. You can even swap the Y motors. The items that could cause this problem, if I remember correctly, are linear glass Y scale, Y motor, and MEI motion card in the PC. I have replaced MEI card 2 times, glass scale once, and 2 Y motors.

Good luck,

Chris

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#62769

contact 3av head homing errors | 23 September, 2010

What is the exact message on the screen?

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#62776

contact 3av head homing errors | 24 September, 2010

I remember this problem but can't remember exactly what the reason was. It might have been the wrong pullup resistor on the MEI interface board used for the home photo on the y axis. You are right, after a couple hours the machine would work fine.

I'm not positive but I think that is what it was. The home photo signal should be at 5V and should drop somewhere below 2V when the head passes over the photo. I would find the drawings and compare them with the resistor values used in this circuit on the board.

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