Need help waking up an older doosan puma 12

alonzo83 · Nov 26, 2020

We recently were given an old doosan puma 12 with fanuc 10t for the cost of hauling it back to the shop. It seems like it was used very little as the buttons are all legible and everything is in very good shape.

We got it placed and wired up and when we try to turn it on we hear the cooling fans and when we press the on button we heard a relay latch momentarily on this board, said board also has a red light come on after the relay un latches.

Any idea of where to check for the cause of the problem?

Batteries show that they still have voltage

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Vancbiker · Nov 26, 2020

The symptom you describe usually points to a problem with the CNC power supply (black boxy thing attached to the right side of the mother board). On a machine that age, many power supply issues are caused by the electrolytic capacitors going bad which causes noisy or out of range voltages. Cheap and easy first step to replace them.

alonzo83 · Nov 26, 2020

Any way to check that it is the power supply?

Tha caps don’t look bad at all.

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Hardplates · Nov 26, 2020

An oscilloscope for the power supply or an LCR meter to test the caps themselves. When caps are referred to as leaky it means electrically leaky, not gooooeee leaking out. To check the caps you can't just use a simple multi meter, they need to be check with an LCR meter. I usually test them for ESR

alonzo83 · Nov 26, 2020

I did check the caps there all quick to come up to about 2.6 kf and stop climbing. Not sure if that means anything at all.

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Vancbiker · Nov 26, 2020

alonzo83 said:
......Tha caps don’t look bad at all.

Man you're way better than me if you can look at a cap and tell it's not bad. I reckon you don't need help then.

alonzo83 · Nov 26, 2020

Vancbiker said:
Man you're way better than me if you can look at a cap and tell it's not bad. I reckon you don't need help then.

No I am really that ignorant. I honestly thought the caps would have fluid leaking from them.

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DouglasJRizzo · Nov 26, 2020

FanucWorld (T.I.E.) has spare parts.

alonzo83 · Nov 26, 2020

I found a local guy that can test the caps on the power supply. Anything else I can check?

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FrankieB · Nov 28, 2020

Check power to the relays and coming out of them and see if one is stuck.

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