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

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PK:
IMO, input caps for regulators tend to blow when they see voltage spikes, so I wouldn't be too concerned about root cause..... Just replace it and trust in Jesus......
PK

awemawson:
I've got an SMD capacitor on order, and I won't pull the OMM again until it's to hand. But if it is the input cap for the 5 volt regulators then I doubt that it's the fault, just 'a fault' as both 5 volts regs measured ok on the Fluke - this thing takes in 10 volts from the MI12 which is itself regulated (I'd assume) so as PK says - just change it !

The cabling for this device is ridiculous. The MI12 sits in the hydraulic cupboard under the controller where there is a 24 volt supply, but the MI12 takes it's 24 volts from a cabinet at the diagonally opposite (rear) corner, with the cable draping all over the place and passing through ungrometed holes. The MI12 to OMM cable goes round three sides of the machine to join front right to front left, with the same draping cables. When it's working (if?) there will be a re-routing exercise.

It was obviously an 'upgrade on site' and of course although I have all the panels off at the moment, the chap who installed this didn't, so it's easy to be critical unjustly.  :scratch:

awemawson:
The ordered SMD capacitor arrived by post this morning, so I braced myself for some VERY tiny soldering. But when I opened the envelope I thought - 'by heck those ARE small'

So rather than dis-mount the OMM and find that I'd cocked up the order I thought I'd try and scale the size from the photographs knowing the size of an 8 pin SOIC IC (which was in the same frame)

Turns out these 33 uF caps need to be between 6.7 and 8.5 mm long, whereas the ones I ordered are only 4 mm long  :bang:

Never mind, better to find out now rather than when the thing is in bits on the desk stopping everything else while waiting for parts. So another order sent off, and this time (plonker before didn't!) I checked the physical size - 7.3 mm long in this case - should arrive tomorrow

. . . hey ho . . onwards and upwards

PK:
If the voltage rating is adequate, then just solder them in. 7805's aren't particular about input  caps.

awemawson:
PK at that scale I don't fancy putting in wire extensions - it's about the limit of my soldering dexterity to get them off and on, never mind extra floating bits of wire  :lol:

(Although I do have a hot blower as part of my de-soldering iron I suspect I'll just use a very fine tip for this capacitor)

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