Products > Test Equipment
BM235 dead on arrival (but easy repair)
jasonb:
Apologies for not responding sooner. I missed that there were more responses.
There was indeed no solder there. However, the component leg was in the hole when I received it. I mentioned in my original post that when I jiggled it, it came out, and I took the pictures after that. I certainly was able to get it to work properly sometimes before I took it apart, and it was correctly calibrated other than on the temperature range.
My belief is that it was never soldered (the pics seem to make this clear), but that it had good enough contact during calibration that it didn't affect it. Likely that was just a missed production step. It likely came loose during shipping.
J-R:
My understanding would be that the SMD component side of the BM235 PCB would be done via solder mask, pick and place and reflow oven. The through-hole components I'm on the fence a little but looking at various photos, I think the opposite side of the main PCB as well as the input PCB are populated and soldered by hand rather than wave soldered. I'm basing this primarily on the inconsistency of the soldering.
From what I see on other tear-down photos, R12 appears to be soldered in vertically, then bent over afterwards.
If you zoom in on the photo of R12 provided by jasonb, you can just see a ring of solder on the pin showing that the component was only inserted a small amount and it also didn't receive a very large dose of solder. Maybe there is a close-up available of that to make it more clear?
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