Electronics > Repair
Fluke 343A repair
Rax:
--- Quote from: 70bytes on June 21, 2024, 01:35:09 pm ---For the top one you need to pull op from the middle. It will fold a bit and come loose. It has slots on the sides.
The bottom one i think is the same.
I have a very early one. Serial# 183
I don't know if later units are build the same.
--- End quote ---
I wasn't clear enough in my request, sorry. I believe that, in order to access that switch - STANDBY/ON - I need to remove the cover(s) that are further to the front of the unit (see pic below). It inserts in side channels (see arrows) and it won't just come off if the screws are removed. Unless I'm missing something obvious, it looks like the handles have to at least be loosened to allow for the cover to no longer be captive to those two side channels.
70bytes:
Ok.
I opened mine to check. No problem. Just needed to tilt. See photo.
Rax:
--- Quote from: 70bytes on June 21, 2024, 02:39:36 pm ---Ok.
I opened mine to check. No problem. Just needed to tilt. See photo.
--- End quote ---
Interesting. Mine won't release even with some force applied (as much as I feel I can before I bend it out of shape or break it). It's captive under the side channels, and it's pretty clear to me it's not intended to just come off by tilting. It may be a later redesign or something like that.
Thank you very much for going into your unit and trying this out.
Rax:
Well, stop press... I pushed my luck and tried harder and it very reluctantly came off. I think there was some possibly conformal residue that was petrified in place holding it in, and it was also probably never removed since coming out of the factory. It looks like it needs to slide in a bit, so I may need to remove that residue to make room on that narrow transversal channel it needs to lock onto.
I just conditioned the STANDBY/ON switch with some Deoxit D5 - being the exact same symptom as in your case, 70bytes - and I'll let it cure for a few minutes and retest... crossing fingers.
Rax:
--- Quote from: 70bytes on June 14, 2024, 10:03:11 am ---The limit LED turned off and immediate turned on again. This time the needle wanted to go to the other site over its max limit. I measured 200V+ at the outputs in the 10V range.
The cause of this problem in my unit was a dirty standby/On switch. After cleaning the switch the problem was solved.
Regards,
Maurice
--- End quote ---
Maurice - that was just spot on. Brilliant, and thank you. Once I conditioned that switch, the unit seems to be working again with no hitch. I should probably say "we'll see," as it seems these may be a bit cranky until several issues (probably all related to age) are resolved.
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