QMS DRO went flakey
PrecisionmachinisT wrote: "Karl Townsend" wrote in message ... Leaving it on all the time helps too. Indicates possible thermal expansion of a solder joint or component...oftentimes, you can poke around with toothpick or something to locate the culprit. Beware of switching power supplies, they can produce a fairly nasty shock. Hairline thermal stress solder fractures around component leads are fairly common. Back when I helped a friend at his repair business any Sony receivers that came in for repair automatically got a manual resolder at all points (heat and add a bit of fresh solder) as that was by far the most common failure. If you looked under a good magnifier you could see the circular fracture around the component leads. |
QMS DRO went flakey
"Pete C." wrote in message ... PrecisionmachinisT wrote: "Karl Townsend" wrote in message ... Leaving it on all the time helps too. Indicates possible thermal expansion of a solder joint or component...oftentimes, you can poke around with toothpick or something to locate the culprit. Beware of switching power supplies, they can produce a fairly nasty shock. Hairline thermal stress solder fractures around component leads are fairly common. Back when I helped a friend at his repair business any Sony receivers that came in for repair automatically got a manual resolder at all points (heat and add a bit of fresh solder) as that was by far the most common failure. If you looked under a good magnifier you could see the circular fracture around the component leads. Wave soldering is notorious for leaving cold joints, especially at any point where fairly large components are mounted, things like cable headers, rheostats and so forth etc. Reason being, the molten solder is not in contact for a long enough period of time for the leads to heat up sufficiently. |
QMS DRO went flakey
"Pete C." wrote in message ... PrecisionmachinisT wrote: "Karl Townsend" wrote in message ... Leaving it on all the time helps too. Indicates possible thermal expansion of a solder joint or component...oftentimes, you can poke around with toothpick or something to locate the culprit. Beware of switching power supplies, they can produce a fairly nasty shock. Hairline thermal stress solder fractures around component leads are fairly common. Back when I helped a friend at his repair business any Sony receivers that came in for repair automatically got a manual resolder at all points (heat and add a bit of fresh solder) as that was by far the most common failure. If you looked under a good magnifier you could see the circular fracture around the component leads. https://www.google.com/search?num=10...TlqAGyxoCA BA |
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