| The Craftmans Shop > New from Old |
| The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20) |
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| awemawson:
The capacitors from RSComponents arrived during lunch, so with no delay they were installed and the orange IG-38 box reassembled. Then it was just a matter of replacing the wiring, putting my fingers in my ears and switching on. . . . . what could possibly go wrong ! . . well in this instance nothing thank goodness. It did precisely what it is supposed to. Initially started pumping showing 15 BAR on the gauge, then after a period switched off into idle mode for the prescribed period before starting over again . . . .PHEW . . so at least I've not introduced other faults, but whether the long term intermittent fault is cured or not there is no saying :scratch: Still, electrolytics changed, socketed IC removed, pins and sockets treated with switch cleaner and re-inserted. ALL PCB solder pads re-flowed, relay contacts cleaned, and interface terminal posts treated with switch cleaner before re-assembly - what more could I do in the absence of a replacement? . . . fingers crossed for the NEXT 8 months :clap: |
| modeng200023:
The nice thing about older electronics is that the components are of a repectable size :clap: John |
| russ57:
You mean visible... About to tackle a harman kordon avr2000 amp with dead channel. The circuit diagram (Iove the internet) suggests the pa module is basically direct coupled discrete power transistors. With luck the problem will be a) visible, b) accessible, and c) a component that is either available or at least a substitute. -russ |
| awemawson:
So once again this lubrication fault has reared it's ugly head stopping the lathe in it's tracks . . . BUT . . I have absolutely positively determined what it is and in essence it is trivial - fixing it might be a different matter. What is supposed to happen is that on power an, and at pre-set intervals then on, the pump starts up and the electronics 'looks' for the pressure switch to close within a certain time frame. If it does, all very well, it goes to sleep for a bit until the next pumping cycle. However if the oil pressure switch doesn't close for what ever reason the electronics flags an error to the CNC controller which promptly curls up it's toes and refuses to make any movements. It turns out the the pressure switch is intermittent high resistance - I've linked it out temporarily and the machine works splendidly. Now the pressure switch, so VERY conveniently, is immersed in the oil reservoir, so not the easiest thing to get at. System pressure is up to 18 bar so probably a 10 bar switch would be fine, but until I dig in a bit further I have no idea of thread size or terminations or body size, though it looks to be quite compact. . . . still. . . . sell the positive . . I now know what the fault is that's eluded me for quite a few months. :thumbup: |
| WeldingRod:
I hate pressure switches! It's always a matter of "when" they die, not "if" Sent from my SM-G892A using Tapatalk |
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