Hi Guys, I have an old QT10 with T1 control in great shape with very low use despite its age. But lately its giving me a little trouble. I've struggled with this machine randomly shutting off occasionally for couple years now. Everything runs fine and then just totally shuts off like you hit the off button. Turn it back on and it fires right up again. Might do this few times a week. But lately it struggles to come back on. Sometimes need to hold the on button in for 4-5 seconds and then let it go. And seems to shut down little more often, especially first thing in the morning.
So ive done a lot of reading on this and it looks like if the power supply output is too high/low or if current is too high it shuts itself off to protect itself. Sounds like this is my trouble. I have checked all voltages and they are great. 99.5V coming in to power supply and the outputs are all exactly where they should be. I wonder if I have too much current shutting it down? Or maybe voltages are dropping intermittently See PDF Here Power supply.pdf - Google Drive
I found one thread on the other CNC forum (google: Need help with QT 10 w/ T1 control) where a guy had a similar problem and unplugged one board and it stayed running. Then found a shorted capacitor on that board. This might be hard for me since problem is intermittent. I had a close look at all the capacitors tonight and most look great, one had little bit of corrosion on end but measured fairly high resistance across it so probably isnt shorted. Ive heard others on here reccomending replacing ALL caps on old machines. Is it worth replacing all the caps anyway even though they look good? How do I know which ones to replace? Do all capacitors go downhill or is just the round electrolytic ones? Disk ones of to leave alone? How about the yellow one in the picture. Does that type break down too?
Anything else I can check?
So ive done a lot of reading on this and it looks like if the power supply output is too high/low or if current is too high it shuts itself off to protect itself. Sounds like this is my trouble. I have checked all voltages and they are great. 99.5V coming in to power supply and the outputs are all exactly where they should be. I wonder if I have too much current shutting it down? Or maybe voltages are dropping intermittently See PDF Here Power supply.pdf - Google Drive
I found one thread on the other CNC forum (google: Need help with QT 10 w/ T1 control) where a guy had a similar problem and unplugged one board and it stayed running. Then found a shorted capacitor on that board. This might be hard for me since problem is intermittent. I had a close look at all the capacitors tonight and most look great, one had little bit of corrosion on end but measured fairly high resistance across it so probably isnt shorted. Ive heard others on here reccomending replacing ALL caps on old machines. Is it worth replacing all the caps anyway even though they look good? How do I know which ones to replace? Do all capacitors go downhill or is just the round electrolytic ones? Disk ones of to leave alone? How about the yellow one in the picture. Does that type break down too?
Anything else I can check?