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My 7x12 Northern Mini-lathe has suddenly quit working. Previously, when I flipped the switch from forward to reverse I heard relays click. Now nothing. The fuse tested good. I did not see any evidence of burnt parts.
I know something about electronics, but it is hard to proceed without a wiring diagram. I do not have an oscilloscope, but I have a VOM. I would hate to replace the control board, only to find that the problem is elsewhere...... I looked online, but did not find anything relevant.
Richard
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LMS has wiring diagrams; one will probably match your lathe.
On Oct 29, 2024, at 1:08 PM, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
My 7x12 Northern Mini-lathe has suddenly quit working. Previously, when I flipped the switch from forward to reverse I heard relays click. Now nothing. The fuse tested good. I did not see any evidence of burnt parts.
I know something about electronics, but it is hard to proceed without a wiring diagram. I do not have an oscilloscope, but I have a VOM. I would hate to replace the control board, only to find that the problem is elsewhere...... I looked online, but did not find anything relevant.
Richard
--
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
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And this site has more detailed info on the (probable) controller board, but honestly, unless you’re adept at repairing complex electronics, if it’s the board, getting a new one is the easiest bet.
On Oct 29, 2024, at 1:42 PM, Bruce J via groups.io <bruce.desertrat@...> wrote:
LMS has wiring diagrams; one will probably match your lathe.
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On Oct 29, 2024, at 1:08 PM, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
My 7x12 Northern Mini-lathe has suddenly quit working. Previously, when I flipped the switch from forward to reverse I heard relays click. Now nothing. The fuse tested good. I did not see any evidence of burnt parts.
I know something about electronics, but it is hard to proceed without a wiring diagram. I do not have an oscilloscope, but I have a VOM. I would hate to replace the control board, only to find that the problem is elsewhere...... I looked online, but did not find anything relevant.
Richard
--
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
--
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
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How far did you check power? As in, is the control board even getting power (past the fuse, mag switch, e-switch)? A VOM is certainly your friend here and even beyond that a scope isn't necessary. Also, do you switch directions with the lathe powered up?
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Had a similar problem with my 7x11 and track it down to the connection to the carbon brush. Good luck
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LMS also has a good troubleshooting guide:
Having said that, a close visual inspection is always a good first step. Look for things like disconnected connectors, foreign objects, broken and/or pinched wires.
Roy
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I want to thank everyone for their suggestions, which seemed particularly good. I was able to print out the schematic, thanks.
I started trying to measure voltage on the control board. Nothing. I could not even see voltage on the AC line...... That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow. I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in. An embarrassingly simple solution. I know perfectly well that when something is not working, I should first check power, AC or battery.
Thanks to all,
Richard
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I wouldn't be too embarrassed. That sort of thing happens to most everybody. And if not, it is because they never DO anything. And even though a simple fix, it helped to go through some steps and then you got there.
I was once testing a very high impedance op amp amplifier circuit I was designing and was getting all sort of noise. I checked all sorts of things. Checked that the oscilloscope was isolated. Everything. Was at it a couple of hours. Then I realized I had not turned on the power supply to the board. With no power, my circuit was basically just being an antenna.
The GOOD news is that there was no electronic issue with your lathe - this time. But with a schematic now, you will be better prepared if some issue does arise.
Charles E. "Chuck" Kinzer
On Tuesday, October 29, 2024 at 07:46:58 PM PDT, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
I want to thank everyone for their suggestions, which seemed particularly good. I was able to print out the schematic, thanks.
I started trying to measure voltage on the control board. Nothing. I could not even see voltage on the AC line...... That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow. I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in. An embarrassingly simple solution. I know perfectly well that when something is not working, I should first check power, AC or battery.
Thanks to all,
Richard
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That makes me feel better for my experience of thinking my lathe was dead - only to realize I had activated the emergency shut-off switch.
On Tuesday, October 29, 2024 at 07:46:58 PM PDT, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
I want to thank everyone for their suggestions, which seemed particularly good. I was able to print out the schematic, thanks.
I started trying to measure voltage on the control board. Nothing. I could not even see voltage on the AC line...... That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow. I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in. An embarrassingly simple solution. I know perfectly well that when something is not working, I should first check power, AC or battery.
Thanks to all,
Richard
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I spent the best part of an hour pulling my “dead” laser cutter apart before realising I’d forgotten to turn the emergency switch back on. We all have brain fades occasionally. At least it’s funny afterwards, Tony
From: 7x12MiniLathe@groups.io <7x12MiniLathe@groups.io> On Behalf Of Arthur Coe via groups.io
Sent: Wednesday, 30 October 2024 4:02 PM
To: 7x12minilathe@groups.io
Subject: Re: [7x12MiniLathe] Troubleshooting Dead unit That makes me feel better for my experience of thinking my lathe was dead - only to realize I had activated the emergency shut-off switch. I want to thank everyone for their suggestions, which seemed particularly good. I was able to print out the schematic, thanks. I started trying to measure voltage on the control board. Nothing. I could not even see voltage on the AC line...... That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow. I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in. An embarrassingly simple solution. I know perfectly well that when something is not working, I should first check power, AC or battery.
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As a retired I.T. Professional my goto is to usually ask that but sometimes it can come off as sarcastic or rude to ask the universal question (actually there are 2; is it plugged in and did you turn it off then on?) . I'm glad it was a simple fix.
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LOL. Been there, done that! Glad it was simple! On Oct 29, 2024, at 7:46 PM, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
I want to thank everyone for their suggestions, which seemed particularly good. I was able to print out the schematic, thanks.
I started trying to measure voltage on the control board. Nothing. I could not even see voltage on the AC line...... That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow. I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in. An embarrassingly simple solution. I know perfectly well that when something is not working, I should first check power, AC or battery.
Thanks to all,
Richard
--
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
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