Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
ch_scr:
--- 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 ---
The common lubricant / cleaner used by japanese service techs on these pots, maybe it is long-term damaging (cracking) the blue plastic specifically? Almost all of these units would have been serviced in japan at least once in their life, given the age?
Vince:
--- 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
Brumby:
--- Quote from: vk6zgo on June 26, 2022, 02:22:13 am ---CB callsigns in Oz were non-conforming to international allocations, as they were assumed to be for "short distance communications", only.
Hence, my CB callsign was WAC 927.
--- End quote ---
Mine was NCH 285. (The first letter being a state identifier. N=New South Wales; W=Western Australia)
That was my only semi-serious foray into the communications scene. Picked up a couple of (unconfirmed) receptions from (apparently) far away. One signal had the typical fade and noise you would often hear when listening in to SW. Only had 2 such "contacts" in 4 or 5 years of operation - and that was enough to satisfy any interest.
I daresay I've saved a small fortune not getting my feet wet in that pond.
nfmax:
--- Quote from: bd139 on June 26, 2022, 10:13:32 am ---Crap report. Some dude emptied the whole place of decent gear before I even got there. Asshat. Had lots of very very nice HP stuff.
Still scored a big Farnell 30V 5A supply, HP 400E voltmeter, HP function generator and a couple of books though :-+
--- End quote ---
Those little HP3311A’s are cute, if limited. Easy to repair if necessary, too. I still like mine
med6753:
--- 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 ---
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.
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