Products > Test Equipment
Saving yet another Fluke 189
daisizhou:
Black rubber material for the end of your button----
One approach is relatively simple, using a conductive metal film with adhesive force on one side and conductive on the other side,You only need to cut a small disc and paste it accurately in the original black position.
Another method is to use conductive rubber adhesive, but this method is complex, but it can last for a long time after repair
joeqsmith:
I pulled both terminal blocks at 640F. No trouble at all and both appear original. Do you have a document from Fluke that talks about the need for a special silver solder? Something you were told? I'm interested in hearing more about this.
I am not sure what the seat is or what is meant by pad becoming focal. Plan will be to replace the entire terminal block. Again, the terminal block is molded into one part. The pads stay the same.
I use copper foil tape which sounds like what you are suggesting. I'll let you know how the conductive paint holds up.
Video showing same repair I plan to do.
daisizhou:
I drew a schematic diagram,When you weld, you increase the welding temperature of the soldering iron,So it will cause discoloration of the PCB insulation layer,If the temperature is too high, it will cause two welding points to conduct and have resistance.
I'm referring to turning brown,To be precise, the PCB insulation layer is affected by temperature,Causing the previously insulated part to become conductive now
joeqsmith:
Attached are photos of the new meter. Consider I had pulled the original terminal block, then installed the one from my bad meter, then removed it again. So 4 heat cycles so far when you include the factory original install.
I wonder if someone used lead free on the boards you worked on. Normally I solder around 620-640F. Not enough to damage the board.
Pins for the com and V are shorted on the board. The current inputs are open for the sense. Because you are not measuring through the two pins, it shouldn't effect the measurement. With the damage you describe, it could however cause the LEAdS error.
daisizhou:
You have good temperature control, but few people are able to do so
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