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Old 04-04-2014, 02:28 PM   #1
budm
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Default FLUKE 43B PM8907 power supply repair

Have two dead out of four power supply for (4) FLUKE 43B.
The resistance reading on the two power prongs shows open circuit.
Open up the module, you will need security bit, and found hair line crack on the circuit board. Too bad that FLUKE did not spec in fiberglass PCB to build this power supply.
Fixed the broken traces and added epoxy to the PCB to help supporting the board.
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Voltage Regulator (LDO) testing:
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Old 04-04-2014, 03:14 PM   #2
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Default Re: FLUKE 43B PM8907 power supply repair

Good eye, bud.
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Old 04-04-2014, 03:54 PM   #3
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Default Re: FLUKE 43B PM8907 power supply repair

Hope you swapped out that "Stone" brand cap. They have all the longevity of a croissant at a feminist buffet.
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Old 04-04-2014, 04:17 PM   #4
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Default Re: FLUKE 43B PM8907 power supply repair

Power supply is made in Germany with lousy cap. The replacement power supply is around $100.
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Old 04-04-2014, 04:41 PM   #5
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Default Re: FLUKE 43B PM8907 power supply repair

Very disappointing for Fluke. Then again, after seeing CapXon in a Tektronix signal generator, I'm not too surprised.

My Rigol scope uses Epcos caps, even though it is made and designed in China, they are OK caps. Not the best, but far from the worst...
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Old 04-04-2014, 04:55 PM   #6
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Default Re: FLUKE 43B PM8907 power supply repair

Epcos is not a reliable brand. I've seen Dave Jones claim they are, but he's wrong.
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Old 04-04-2014, 05:02 PM   #7
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Default Re: FLUKE 43B PM8907 power supply repair

Quote:
Originally Posted by mockingbird View Post
Epcos is not a reliable brand. I've seen Dave Jones claim they are, but he's wrong.
EPCOS are one of the largest manufacturers of capacitors primarily used in industrial and hi rel applications where the Japanese brands don't fill the market and they also cost a little less. For example they're a lot better at higher temperatures - the water electrolyte in the Japanese caps can boil off at high temperatures, reducing reliability.

I have reasonable confidence in them. I doubt they're as good as a Rubycon or Panasonic, but I wouldn't call them unreliable. I've never seen one go bad.
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Old 04-05-2014, 07:09 AM   #8
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Default Re: FLUKE 43B PM8907 power supply repair

Quote:
Originally Posted by mockingbird View Post
Epcos is not a reliable brand. I've seen Dave Jones claim they are, but he's wrong.
Like tom, I've never even heard of them going bad? Have you?!
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Old 04-06-2014, 12:49 AM   #9
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Default Re: FLUKE 43B PM8907 power supply repair

Thanks for sharing. I'm surprised they are made in Germany and not China.
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