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Frankenstein's Fix: When in Doubt, Try Banging on It!

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Caleb Kraft
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truly a pro
Caleb Kraft   9/26/2013 12:41:38 PM
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haha, I lOVE the diagram!

Embedded SW Dev
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Device just needed some PM
Embedded SW Dev   9/26/2013 3:34:47 PM
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I had an army friend who described this process as performing PM - percussive maintenance.

Caleb Kraft
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Re: Device just needed some PM
Caleb Kraft   9/27/2013 11:56:08 AM
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I've heard it called "BFR" or Blunt Force Repair

David Ashton
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Re: Device just needed some PM
David Ashton   9/28/2013 7:09:15 AM
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My dad used to call it "Brute force and ordinary ignorance".  It can take you a long way, sometimes.

Caleb Kraft
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Re: Device just needed some PM
Caleb Kraft   9/28/2013 9:42:25 AM
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Your dad sounds like a wise man!

Ron Neale
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Re: PM The old hammer cure
Ron Neale   9/28/2013 12:34:37 PM
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Wise and no doubt experienced.  I can remember visiting an instrument (scopes and the like) hire company in the UK. Their business model required that they kept detailed records of repair call-outs for the equipent out on hire. Those records showed that irrespective of original instrument manufacturer, most repair call-outs were in the first few days after delivery. While the hire company diligently serviced their customers requests one of the engineers at the hire company gave the following insight, "In most cases a good bang on the case would have solved the problem". The problem that is of boards and connectors moving in transit. It is to be hoped modern instruments have for the most part dealt with this problem.

Caleb Kraft
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Re: PM The old hammer cure
Caleb Kraft   9/28/2013 12:39:34 PM
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I think that has been improved considerably. I haven't had an issue with a bad connection out of the box in a long time. That doesn't stop me from banging on things when they don't work though!

Ron Neale
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Re: PM The old hammer cure
Ron Neale   9/28/2013 5:45:05 PM
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Caleb Kraft- I certainly hope the moving pcb problems have gone away, no doubt aided by higher levels of intergration and surface mount. However, here are two similar that happened to me today. Went to use the scanner, up came the message your C4280 is not connected. I knew it (expletive deleted) well  was, so I rebooted still the same then found that in moving a nest of cables that links this office together I had moved the USB slightly out of its socket. I know, go Wifi.

Well decided to watch my Smart TV and although it responds to my voice and various hand waving signals I decided to use the remote. Nothing happened, couple of sharp taps on the table and the connection between me and the world of TV was restored. (the old battery/spring problem)

David Ashton
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Re: PM The old hammer cure
David Ashton   9/28/2013 8:19:32 PM
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It's always a problem.  Had two similar experiences just in the last week.  My PC (an ancient XP machine  I cobbled together with begged and scrounged bits) is a bit flaky and sometimes fails to boot.  Percussive maintenance usually works.  I have been running it with the case off and by a method similar to that in the story, determined that it's the video card that is the problem  Since I reseated it in the slot, no more problems (cross fingers, grab nearest bit of wood  :-)

And my label printer exhibits similar problems.  Take battery cover off, rotate all the (AA) batteries half a turn or so, and it's good for another few labels.

If electronic equipment never failed, I'd be out of a job.  So long may it continue!

WKetel
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Knock it to check it
WKetel   9/28/2013 8:59:03 PM
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Many long years ago, prior to my engineering career, I was a service tech for Sony corp, servicing recorders, mostly. We had a very standard service procedure, and about the third step was to slap the tape deck while it was playing. The slap would reveal a number of problems, the most common being a bad record-play switch. If the slap test revealed a noise, the next step was a blast of contact cleaner, which, if that fixed the problem, indicated that the switch needed replacing because the silver plating on the contacts had worn off and the switch had become intermittant. The slap would also reveal a broken connection to the tape head, which that piece of #30 stranded wire would beak under constant flexing if the routing was not exactly correct. And a different sort of noise from one channel would indicate that a soldered board connection had broken and needed to be resoldered.

So that gentle slap would provide a diagnosis of many faults, with a minimum of tech time.

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