The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)

The Craftmans Shop > New from Old

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hermetic:
Andrew, could you rig up some sort of tester to put, say, 1 to 2amps through each connection to see if it broke down,, that would show if you had any more dry joints. Possibly the action of pushing in the plugs helps to cause this problem? What a pain! You could of course leave it as is, because you would know where to look in the event of another failure, but also considering the job or worse that the failure might cause damage to.................I think my autistic nature would make me check them all too! Good luck!
Phil

hermetic:
actually, looking at those tracks, maybe 500mA!

awemawson:
Well Phil, I cracked on and did IP2 Klippon Block.

Only one pin that looked possibly suspect, but of course I re-soldered them all. This one was a bit of a pain to do as several terminals had multiple cables entering them. There was the "bugger" moment when re-wiring it I found that I had two white wires BOTH labelled #30. I remember now that that was when the Postman arrived :bang: Easily sorted with the circuit diagram and a meter. Cable #29 now CORRECTLY labelled :thumbup:

Then there was the heart stopping moment when testing and the machine refused to jog. Looking for a wiring error I found I'd left the 37 pin cable unplugged - plonker :clap:

Tested OK eventually - so that's three out of five done. Depending on how good lunch is I'll try for another later !

awemawson:
On a bit of a roll, I went straight ahead and attacked the first of the digital output blocks OP1. Relatively lightly populated only having 13 wires needing labelling, the rest already bearing sensible numbers, and no complications of 'two in a hole'

All went well, the soldered pins looked absolutely fine, but of course I soldered them anyway. Re-assembled it - re-wired it and all tested OK - phew !

. . . on to the next (LAST :thumbup:) one before I crack !

awemawson:
So after an absolutely marathon session un-wiring, labelling, soldering, testing, and re-wiring Klippon 37 way terminal blocks all five are now done. :clap:

The last one, OP2, wasn't too bad. Although pretty well fully populated all but eight wires had sensible numbers on them. Once out an inspection showed that one pin was a bit suspect at the extreme end of the socket, but of course I soldered all 37 then tested them for continuity. All well when re-installed :thumbup:

So hopefully that has shaken out a few failures down the road and improved reliability markedly. It was only the IP3 block that show a gross error with virtually every pin moved off the board. Strange really as the cables to the D37 sockets are all well secured to the cabinet and not apparently straining the connector :scratch:

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