Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
Vince:
--- Quote from: med6753 on June 26, 2022, 12:09:44 pm ---I guess I've been lucky. No issues with them at all. But given that I'm not going to touch any of them during final calibration unless I have no choice.
--- End quote ---
Yes, don't touch any of them, don't even BREATHE too close to them ! When I opened the scope, all those trimmers look fine at first, it's only when I tried to operate them, barely touching them with my finger tip, that the knobs started to all off one after the other ! Sometimes just moving the scope the bench was enough to make them self destruct ! :scared:
Luckily you are in the US so you can have all of them for cheap, and fast, from Mouser like I did 5 years ago.
So it's not as big a deal for you as it was for me at the time.
bd139:
Ok first thing. Just got back. The 465B does not work. Classic symptom is the power supply gives out after a few seconds. Smells like tant :-DD. I’m not looking at it yet.
med6753:
--- Quote from: bd139 on June 26, 2022, 12:46:00 pm ---Ok first thing. Just got back. The 465B does not work. Classic symptom is the power supply gives out after a few seconds. Smells like tant :-DD. I’m not looking at it yet.
--- End quote ---
Welcome back to 400 series I hate the smell of tants in the morning. :-DD
BU508A:
Soldering in the field, literally (next 10 seconds):
https://youtu.be/yl0NNmuaSJE?t=346
:-/O :-+ :-DD
TERRA Operative:
--- Quote from: Vince on June 26, 2022, 11:30:10 am ---
--- Quote from: TERRA Operative on June 26, 2022, 11:05:44 am ---
--- Quote from: med6753 on June 26, 2022, 10:50:50 am ---
--- Quote from: TERRA Operative on June 26, 2022, 10:30:30 am ---
--- Quote from: med6753 on June 26, 2022, 08:42:14 am ---
--- End quote ---
Ooooh, I hate those blue trimpots, I find they are almost always faulty in the TM500 gear I've repaired. I replace them on sight now...
--- End quote ---
Interesting. I've never had issues with them. :-//
--- End quote ---
Yeah, not sure why I keep finding the bad ones. Usually the grey ones are ok, but I've had a few bad ones of those here and there too. Last one was broken in the center 'axle' so the turny bit kept falling out.
--- End quote ---
Same here, I concur ! :scared:
When I bought my 5000 series scope, found many of thes horrible trimmers on the two CRT boards. Half of them had fallen apart in the way you describe, knob falls apart because the thin plastic shaft holding it to the body of the trimmer just eventually breaks off, disintegrate, leaving you with no wiper because it's part of the knob ! :palm: Cheap horrible design.
So I went to replace them all, but to my surprise the pin layout and pitch was somehow unusual and I had difficulty finding a suitable replacement. Eventually found a brand and model that was identical, but hard to find. Since I needed many different values, I could not find any place in Europe that carried all the values I needed in stock. An Ebay seller would have one particular value, another would have another particular value, and Farnell would have 3 or 4 tops. Only Mouser IIRC in the USA had all the values available, so I resorted to paying a silly amount to import them.
So yeah, I HATE those trimmers too ! :-DD
--- End quote ---
From memory, they are just a 2.54mm (0.1") inline pin spacing. I usually replace them with Bourns multiturn trimpots model 3296W. Gives me super fine control when adjusting and calibrating so I can really dial things in.
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