Fanuc 10ma blank screen...HELP - Page 2
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  1. #21
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    OK.

    Sounds like you lost the high voltage section.

    How far up this thing's ass are you willing to get? Check the usual suspects for a used working CRT. Check prices for a LCD upgrade. If that fails, we can do some further troubleshooting.

    If you are willing to play with some high voltage stuff, we can get confirmation. The flyback transformer can create upwards of 15,000 volts, but it's extremely low amperage, so if it bites you, you'll surely feel it, but it's not going to kill you unless you do something really wrong.

    Under that weird looking suction cup thing is the high voltage output. Using some insulated tools, see if you can pop it out of the back of the CRT. Then hold the metal clip on the bottom side of the suction cup maybe 1/4" from the chassis of the CRT and turn the power on. Use some kind of insulated tool to hold it. You should see it make a continuous blue arc to the chassis, just like checking the spark on an old Briggs and Stratton.

    If there is no arc, there's no high voltage and the CRT will be dead. Then we have to figure out why. Could be a bad HOT transistor.

  2. #22
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    It is a A61L-0001-0086. There is a new lcd replacement in Illinois on ebay for $650 I also sent a request in to Industrial-panels.com to see what one of their lcd replacements cost. Replacing with a lcd seams the easiest

  3. #23
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    Yes. It is easiest. But, I'll bet you can fix that CRT with $5 in parts. But, knowing which parts is the trouble.

  4. #24
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    Ok so you’re saying pull the suction cup looking thing out of the side tube/ pyramid back of the screen? Just to clarify

  5. #25
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    Yes. But do it carefully because there are capacitors that may hold a charge and zap you. Once it's out, it should arc to ground any time the power is turned on.

  6. #26
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    Quote Originally Posted by ewlsey View Post
    Yes. But do it carefully because there are capacitors that may hold a charge and zap you. Once it's out, it should arc to ground any time the power is turned on.
    Just tried it but no arc. Thanks ewlsey you've been a lot of help. What to test now?

  7. #27
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    Do you have a multimeter with a diode test function?

  8. #28
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    Yes. I have a fluke 117

  9. #29
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    OK. I'd start checking diodes and transistors. The transistors should all check as 2 diodes from the center leg to each outside leg.

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  11. #30
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    The new LCD from Dynamic Displays showed up today. The installation took a little longer than the 10 minutes they said because it did not fit the existing crt chassis but with some slight modification it bolted right up to the operator panel. I need to play with the adjustments a little to make it appear a little more pleasing to the eye but its up and running again. Thanks for all the help guys. Now back to trying to figure out the junkford
    Attached Thumbnails Attached Thumbnails img_0087.jpg   img_0081.jpg  

  12. #31
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    Please tell me they don't make you run an external 120V cord to power that thing?

  13. #32
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    yes...but the op panel had a 100v plug on the side of it. I installed a plug on the inside of the cabinet from those leads so you can't see it and don't have a wire coming out of it.

  14. #33
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    Wow. That's pretty lazy. I guess their panel can't run on 24VDC and a simple voltage regulator was too much work.

  15. #34
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    Not very many machines have 120VAC in the operator panel. That would add a PITA factor to install one of these in a machine without that. Having to fetch a wire from the back cabinet out to the pendant can sometimes be pretty tough.


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