Need Help!- Boss 5 Intermitent not responding

[timprebleco]

Guy's
I have been running my Series I Boss 5 some lately. I was doing a real simple drilling job, After about 6 hours running it quit responding. This is the longest I have ever ran it at one time, when I would restart the program. Some times if you hit the start switch 3 or 4 times it would run. I shut it down and reloaded the program and it would run once or twice and then not respond. I removed all 3 large boards and used an eraser on the contacts and it would run a couple of times and then nothing. After about an hour I gave up because even the axis would not jog. I started it up this morning and and it ran fine for the rest of the parts that I had, about 2 hours. I would seem to me that it is heat related. Where would I begin to look for the answer. Any suggestions?
Thank you;
Tim

[machintek]

Check all the fans. There is one beneath the logic boards. There are two behind the tape reader. And one on the back cabinet.
Tell us if there is a difference.

George

[timprebleco]

George,
All 4 fans are working. I took the outer grill & filter off of the enclosure under the tape reader and put a box fan in front of it, I opened up the rear main power door and put a large volume blower in front of it. I was moving a lot of air through those cabinets. It ran longer than it did without the extra fans but it began doing the same thing as before only not as often. If I shut it down for an hour, I could get it to run for about 1.5 hours. It was warm in the garage today, about 73 deg.

[machintek]

There is one possibility that comes to mind but you may not like it. It may be a bad solder joint. How do you find it? Only by substitution. Even then, it may not be on a board.
When it fails, is the ERR LED lit? Is there any other details you can give? Have you checked the logic voltages?
Sounds like things are still heating up to a critical point but at a slower rate with the additional air flow. You may need to get a can of cold spray and start to use it on small areas at a time until you find the culprit.

George
George