The fuses are not expensive. They are just a nuisance to replace. The leads are pretty soft so getting them into the sockets usually requires you hold the end of the lead with needle-nose pliers. And you have to disconnect cables to open up the case.
Reading Sherline's troubleshooting guide, it mentions that a broken cable from controller to motor can also blow the fuse. I pulled the last leg of the cable which goes from DIN to a Molex-type connector, to test connectivity.
I taped the Molex end to the table so that I could effortlessly (almost) touch each contact. There was no similarly easy way to do the DIN end. If I had a connector that brought out the leads to wires, it would have been easier. Nonetheless, I was able to verify that some wires lack connectivity
.
Yes, I have a spare believed to be operational replacement. I am going to test it before hooking it up. I am also going to test the fuse for resistance before completing reassembly.
Yes. I can test the fuses in situ and the Z axis fuse is definitely blown. No continuity while all the rest are.
UPDATE: Manual operation is just so painfully slow. I need to move cutting tool 1.75" to the left. Instead of G1 X-1.75 F25, I calculate the number of handwheel turns. 1.75"/.050=35 turns. Some distances become x turns and turning the handwheel 15 lines.
Also, specifying feed rate is so much more precise than calculating how many rpm to turn the handwheel. In theory, you should get a feel for whether you are cutting tool fast. I am not confident that I am there.
It can be done, but waiting for the controller to return makes more sense.
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