Products > Test Equipment
121GW strange range/socket problem
tautech:
--- Quote from: Morg on August 18, 2024, 05:01:11 am ---I can't see cracks on the jack in question for sure. I can see the whole jack fixture is cracked right in the middle, though I'm not sure if this is relevant to my problem.
Is there a special way to ask for replacements or should I just write to Dave?
--- End quote ---
Report yourself to the moderators with a @ Dave, which will get his attention.
J-R:
The replacement jacks were for units where the cylindrical portion split apart due to a plastics contamination.
If the jacks themselves are not cracked, then I would focus on finding a loose connection such as where each jack is soldered to the PCB. There are two solder points on each jack, 180 degrees from each other.
Can you post a couple photos? Front and back of the bottom half of the DMM PCB.
Morg:
You can see the crack on the backside; I can't see any other (obvious) cracks.
The jack for mA/µA has already been resoldered, but to no avail.
robert.rozee:
using a second multimeter, check for continuity between each of the two solder joints for the offending jack and the associated half-round inside of the 4mm hole. i'm picking you will find continuity on one, and not on the other.
the break will be within the molded plastic, where the half-round narrows down to the 1mm wide strip that emerges and goes to the solder pad. apart from replacement, the only way of fixing will be to dig down into the plastic from the back until you get to the edge of the half-round and carefully solder on a wire. since it is the 'sense' contact it will be carrying next to no current.
cheers,
rob :-)
J-R:
Those jacks appear to be in excellent shape. I don't see how they could be the issue. But still agreed, start by verifying continuity on each jack, and then follow the circuit, checking for loose solder joints or some other type of crack.
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