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| 121GW strange range/socket problem |
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| electr_peter:
As mentioned above, measure continuity on all connections. All terminals are exposed on the back side, almost no plastic cutting should be required. |
| Morg:
Measured continuity between inner contacts and outer terminals on the back of the jack, outer terminals and solder joints - nothing (means all are connected...). Guess I will dig into the terminals anyway, as mechanical stress on the terminals could trigger the (mal)function in the first place. Will also check further into the pcb wiring, though I don't expect anything there... |
| J-R:
If the jacks test OK, then for sure look at the PCB and components for a while instead. Some common techniques are pressing/flexing the PCB using a plastic poker of some sort, and heating/cooling the PCB & components to see if that helps to narrow down the fault. Also, SMD parts can crack themselves, not just the solder joint. Also, try to reproduce the issue with the leads connected to the jacks, and perform the continuity tests at that point. |
| Morg:
On the jack detection side everything seems fine with/without connected lead up to the OP-Amp (black brick next to the jacks, present next to uA and A jack). I'm neither sure what it really is, nor where and how it's soldered (I see two solder joints at the sides, but they look as if they are really soldered to the PCB below the part?). I removed part of the back of the jack's plastic, but didn't dare "dig deep"; anyway, measuring from inside the jack and alternative from a plugged lead every contact point leading from the jack to the "jack detection" side measures okay so far. As soon as I plug a lead, both jack contacts are well connected. |
| J-R:
If flexing the jack a certain way solves the issue, then just keep doing that while you hunt? Also, it looks like the sense connection for the mA/uA jack goes into an inner layer of the PCB then goes under the selector? Does pressing on the selector make any difference? |
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