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Test Equipment Anonymous (TEA) group therapy thread
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xrunner:

--- Quote from: bd139 on July 20, 2022, 05:45:11 pm ---Ok just bought a dead Marconi 2022E signal generator from scottrade12. Down the rabbit hole we go  :scared:

Almost certainly it's one of several problems:

1. The osc is duff and this runs the synth and CPU -> run off external one and test then replace it.
2. The power supply is duff -> debug and fix
3. Probably several dead OM345's -> MAR6 MMIC + friggery.
4. Attenuator duff -> kill me with fire.


--- End quote ---

Had a 2022D 7 years ago. It worked OK after some fixes. One of the major things I found were solder joints simply no good anymore. Had to reflow a bunch of them.  :-\
mnementh:

--- Quote from: Saskia on July 20, 2022, 06:19:01 pm ---Seppuku is not okra. Seppuku is taking some blade, wrapping it in paper, ramming it into your belly and performing 3 cuts. after which the kaishakunin helps you into the void.
buying a farm seems to be typical expression within the us military of the 50-70s. as can be read in Heinlein novels or listened to in periscope films military training videos. sometimes snuffing it is also referred to as real estate deal in this context.
--- End quote ---

Yes, I know what Seppuku is. My meaning was that it evokes a similar response as yours to brussels sprouts.

So yes, If I intended to buy the farm, I would probably buy a farm with fields of okra and brussels sprouts, because I would be dead and I wouldn't care.

mnem
Who wants to live forever?
bd139:

--- Quote from: xrunner on July 20, 2022, 06:34:48 pm ---
--- Quote from: bd139 on July 20, 2022, 05:45:11 pm ---Ok just bought a dead Marconi 2022E signal generator from scottrade12. Down the rabbit hole we go  :scared:

Almost certainly it's one of several problems:

1. The osc is duff and this runs the synth and CPU -> run off external one and test then replace it.
2. The power supply is duff -> debug and fix
3. Probably several dead OM345's -> MAR6 MMIC + friggery.
4. Attenuator duff -> kill me with fire.


--- End quote ---

Had a 2022D 7 years ago. It worked OK after some fixes. One of the major things I found were solder joints simply no good anymore. Had to reflow a bunch of them.  :-\

--- End quote ---

Yeah fully expecting some trouble for my money (£100)

Worst case if it’s a lemon I can get money back on parts I reckon.
mnementh:

--- Quote from: xrunner on July 20, 2022, 06:34:48 pm ---
--- Quote from: bd139 on July 20, 2022, 05:45:11 pm ---Ok just bought a dead Marconi 2022E signal generator from scottrade12. Down the rabbit hole we go  :scared:

Almost certainly it's one of several problems:

1. The osc is duff and this runs the synth and CPU -> run off external one and test then replace it.
2. The power supply is duff -> debug and fix
3. Probably several dead OM345's -> MAR6 MMIC + friggery.
4. Attenuator duff -> kill me with fire.


--- End quote ---
   Had a 2022D 7 years ago. It worked OK after some fixes.

One of the major things I found were solder joints simply no good anymore. Had to reflow a bunch of them.  :-\
--- End quote ---
Oooooh... wouldja lookit dat V-212. All shiny & bright, like a new penny.

Reminds me I need to design and print a new bezel for my old one...  :-\

mnem
 :-BROKE
tggzzz:

--- Quote from: Kosmic on July 20, 2022, 03:54:50 pm ---Arrggg just saw a cheap Tek 485 on ebay this morning, sold as "used" and supposed to be working. I was about to post the link over here but hitted "Buy" instead  :palm:

--- End quote ---

Oooh; you lucky person. Very sensible.

Get rid of the 15V tant caps on the 13V PSU line - the line that isn't shown on the PSU diagram. Start with C911(!); the rest are a pain to find on the schematics.

Two things use when you get it: the cal out signal (which is <1ns risetime) and the real 50ohm inputs (not the 50ohm//15pF travesties found on most scopes).

When you can explain the difference between the cal out signal driving the 1Mohm and 50ohm inputs, you will have been amused and learned something :)
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