I was ask to look at this board to see why it would not power ON
A used servo drive run around $1500 to $2500 and from $2000 to $5000 on Ebay
The servo drive was made back in the 199_--> something
They used a good brand name caps on all of the boards
This first thing I saw was electrolyte coming out of the two 3.3uf @ 50 volts caps for the switching IC chip
One note on this it also had taken the coating off of the traces under one the two caps for the switcher IC chip
I also cleaned the board with flux remover all around where the coating had come off of the traces
When I check the IGBT modular that was on the bottom board it had some funny meter reading from one terminal to the next terminal and they were not the reading that the manual says I should have
So we ordered all of the caps that were on all three boards except the very big cap that was not ordered
We also ordered a IGBT modular for the last board and the two small IGBT modular and 8 mosfets that control the big IGBT modular for the last board
When I check the mosfets that have the same part number on them not all of them had the same reading and reading on a new one were not the same as the one on the board ------> All of the new one have the reading
The small IGBT modular s did not have the same reading pin per pin as the new one dose
I recap the two boards install the 8 mosfets the three IGBT modular one switching IC chip
Another note This board took a while to rework because this is malt-tee lair board I was using a de-soldiering gun set at 800' F
and even with that on some parts I had to hold it there for a little while before I could suck all of the soldier out of each hole
What do you know the servo board come back to life
We could not test the drive to see if it works or not because the battery for the CNC controller went dead and now all the parameter need to be reprogramed in to the controller
A used servo drive run around $1500 to $2500 and from $2000 to $5000 on Ebay
The servo drive was made back in the 199_--> something
They used a good brand name caps on all of the boards
This first thing I saw was electrolyte coming out of the two 3.3uf @ 50 volts caps for the switching IC chip
One note on this it also had taken the coating off of the traces under one the two caps for the switcher IC chip
I also cleaned the board with flux remover all around where the coating had come off of the traces
When I check the IGBT modular that was on the bottom board it had some funny meter reading from one terminal to the next terminal and they were not the reading that the manual says I should have
So we ordered all of the caps that were on all three boards except the very big cap that was not ordered
We also ordered a IGBT modular for the last board and the two small IGBT modular and 8 mosfets that control the big IGBT modular for the last board
When I check the mosfets that have the same part number on them not all of them had the same reading and reading on a new one were not the same as the one on the board ------> All of the new one have the reading
The small IGBT modular s did not have the same reading pin per pin as the new one dose
I recap the two boards install the 8 mosfets the three IGBT modular one switching IC chip
Another note This board took a while to rework because this is malt-tee lair board I was using a de-soldiering gun set at 800' F
and even with that on some parts I had to hold it there for a little while before I could suck all of the soldier out of each hole
What do you know the servo board come back to life
We could not test the drive to see if it works or not because the battery for the CNC controller went dead and now all the parameter need to be reprogramed in to the controller
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