Electronics > Repair

Help with Fluke 175 repair

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MC2Short:
Hey guys, I'm new here, and got suggested to post this here from a good dude on discord who was trying to help me figure this out.
So I accidentally blew up my Fluke 175 on a MOT like an idiot, and I've been trying to fix it. The ohms and continuity modes especially were messed up. The resistance testing didn't work at all, and the continuity setting would beep with or without the leads, or the fuses. I figured out I had some bad MOV's. I replaced them with good ones from another dead older fluke. I checked the diode bridge and that tested fine, I tested the green resistor it tested at 1K ohm. The grey one on the left is 1 ohm. I now have it to the point where measuring ACV and DCV is accurate, and my resistance setting works somewhat now, but it's reading wrong. The continuity setting doesn't continuously beep when on continuity, and it was beeping when I shorted the leads, but it still also gave me wrong resistance numbers. So at this point I'm trying to figure out what I need to do or check or replace to get the ohms/continuity reading right. Thank you for your help. *Update* My 175 is now apparently not reading AC voltage now for some strange reason. [ Specified attachment is not available ]

MC2Short:

MC2Short:
I should also add I tested all those and resistors all were 123.6K ohms. Battery is brand new, I also used different leads I had. I'm not sure what else to do or check at this point.

MC2Short:
Lol I seen this cal point on the back of the 175[ apparently it's not going to do me any good as it seems I need a multifunction calibrator which used at cheapest I've seen is roughly $500 all the way up to $80,000!! Good Lord.
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bdunham7:
Unfortunately I'm not aware of a schematic being available for this, but here's a guess (and what I would try next).

If you have hot tweezers or another way of easily removing and reinstalling SOT-23 packages, look at the photo I've attached and locate the six three-terminal devices that I've drawn a red line around.  Just remove them all and set them aside and try the meter again and see if it works properly.  Make sure you keep them organized so they go back where they came from in case this turns out to be a dead end.

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