No power on control

[wolfy11511]

I have a 1988 Hurco BMC 30. Came in this morning and there was no power on the control. I opened the side with the spindle drive and it's on with no alarms, the amp has one green light lit up, so it appears all good there, but when I open the cabinet with all the relays and such the fans are working but nothing else is no lights on anything. I have checked all the fuses I can find reseated all the boards and checked all cable connections. The spindle sometimes stops in the middle of whatever its doing and I get a spindle drive fault or agree system failure. Sometimes it does that alot and sometimes not. Actually on Friday it didn't do it at all.

Any help is appreciated,

John

[bloke]

Check that you have 115vAC to the input side of the power supply (gold mesh box, 12" x 5" x 2") between L & N.
If 115v is present, check that you have the following DC volts on the output wires relative to 0v (grey wires):
yellow 5v
brown 12v
orange -12v
blue 24v

[wolfy11511]

Thanks for the reply. I checked the voltage, I am getting 135.4v in. While checking I noticed the small fuse was blown I replaced it and it blew immediately as I turned on the power. Of course with the blown fuse I got 0v out. I traced all wires out and could not find a short or anything. We have a brand new machine coming in two weeks. I just need her to hold on a bit longer lol.

Just an update. I tried unseating the boards and installing a new fuse and fired it up and it immediately blew the fuse again, I am stumped.

[bloke]

Which fuse is blowing? Is it inside the power supply?

[wolfy11511]

Yes just a small 3amp glass fuse.

[wolfy11511]

I have checked for shorts, bare wires, etc... I can't find anything.

[bloke]

Sounds like your power supply has gone west. If you just need it short term, you could fit it with a PC power supply and a separate 24v supply to replace the blown supply.

[wolfy11511]

Thanks for the help Bloke. I will order a new one.