Thread break detection

[Bill C @ Fineline]

One of our 4 XTs quit detecting thread & bobbin breaks. It just keeps sending thread. The detection is turned on. We checked it many times & it wont stop the machine. So we orderd a new sensor bar. Put that on & it still wont detect thread or bobbin breaks. I checked all the connections in the brain box also. What else could it be? Also Melco sends the plate with the thread holes along with the sensor bar, that dont wear out. Thanks for any answers, Bill from Manhattan, IL

[Rod or Sharon]

Bill,

Have you traced the cable from the threadbreak sensor down to the motherboard? Sometimes exercising the connector to the motherboard by unplugging and plugging it back in will cause a connection to take hold if there is some corrosion involved....we do this often as a trouble shooting technique when necessary. Did you physically unplug and replug it a couple of times when you checked it?

If the sensor replacement did not do the trick then ....

1. you replaced a bad sensor with a defective sensor.

2. Neither sensor is bad.

3. The cable from the sensor to the motherboard is malfunctioning.

4. The connection from the cable to the motherboard is not secure or is corroded.

5. The sensor PC board is shorting out against the needlecase if the insulator is not present.

6. The main motherboard is kaput....

It is a bit of a hassel, but taking a known good sensor off of one of your other machines and trying it on the problem one would tell you the story...if that did not work....swap the known good cabe from one machine to the other....bet you would isolate the problem this way....

Rod Springer
Amaya Tech & Trainer

[Bill C @ Fineline]

Thank you Rod, I had checked that everything was plugged in tight, but didn't unplug & replug them. That did the trick, all detections are working now. My Son said why didn't you do that in the first place and save me the money buying the new sensor. I said, now we have a spare. Is there a tests with a meter you can do, to see if the old one is still good? Thank you again for your help, Bill from Manhattan, IL

[Rod or Sharon]

Good deal...sometimes it is the simple things that are the problem. What is it they say....Can't see the forest for the trees......

I am sure that someone that knows something about solid state circuitry could trace out any problem area in that small pc board or wiring to the pc board and crystals, but I don't have that kind of training.

Rod Springer
Amaya Tech & Trainer

[Bill C @ Fineline]

Rod, I thought the unplugging the thread break sensor in the control box and replugging it fixed the problem, but I was wrong. It was just the turning the XT off and back on that did it. But it still doesn't detect some of the time. Sometimes it detects and sometimes it doesn't. Ever thing else works ok. Thanks

[The Embroidery Authority - OLD]

Bill,
In addition to the intermittent faulty thread break detection, does this machine ALSO sometimes give you problems when turning on the machine? As if you flip the power switch to the on position but the machine doesn't boot up. Then you try it again or possibly at a later time and the machine powers up okay???

Ed

[Bill C @ Fineline]

Sorry it took so long to get back. No, it starts up ok, but when it runs awhile it will not detect thread breaks. Bill from Fine Line