Ok, so I opened up an old teac cassette deck that was completely dead.
The 3 power electrolytics, or at least one of them, had spilled a messy brown deposit over everything in the area. I removed them, cleaned up as much of the deposit as possible and replaced them with new caps.
Now it works, one of the cassettes has some other problem but that's another story...
BUT, all three of the removed electrolytics test ok on a cheapo ESR meter (including value), and pass the basic DMM test of rising resistance...
So I'm wondering, is this possible? It seemed to be CLEARLY the electrolytics, and it works now. Of course, I could have freshened up a dry solder joint in the area with the removals but then that doesn't explain the messy spillage.
Basically I'm just asking if the basic cap tests don't cover all potential failures!
The 3 power electrolytics, or at least one of them, had spilled a messy brown deposit over everything in the area. I removed them, cleaned up as much of the deposit as possible and replaced them with new caps.
Now it works, one of the cassettes has some other problem but that's another story...
BUT, all three of the removed electrolytics test ok on a cheapo ESR meter (including value), and pass the basic DMM test of rising resistance...
So I'm wondering, is this possible? It seemed to be CLEARLY the electrolytics, and it works now. Of course, I could have freshened up a dry solder joint in the area with the removals but then that doesn't explain the messy spillage.
Basically I'm just asking if the basic cap tests don't cover all potential failures!
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