Electronics > Beginners
Oscilloscopes to stay away from? (spec: Tek 2337 question)
FlyingHacker:
--- Quote from: j ferguson on April 11, 2017, 03:36:42 pm ---I replaced the dallas nvram on my 2445b. and the smd capacitors which had just started to leak, no trace penetrations. I was very careful in solder sucking but did disturb a trace running past one of the pins but it is still sound.
Now I get flashing lights on control board when I turn it on, but it never gets to self-test. I tried replacing the dallas nvram but no joy.
if i do the delta v- delta t slope button push, no effect.
my garage has room, so I could buy another 2445b, or maybe i should go to a 2445 and get away from the smd problem.
what would you do?
--- End quote ---
Join the TekScope yahoo group. Some of those guys are on here too, but they seem to know everything about old Tek gear and how to fix it.
j ferguson:
I do follow the tekscope list-serv. I suppose I could have asked the question more clearly. I have a problematic but otherwise very nice 2445b. But it doesn't work for reasons not clear. I could buy another 2445B and might find a deteriorating situation withe the A5 SMD caps AND get to do another NVRAM ....
OR
I could buy a used 2445 and avoid the SMD problems.
is the 2445 a better bet as far a maintainability over the next ten years or so? Or is this a silly question?
edavid:
--- Quote from: j ferguson on April 11, 2017, 11:36:52 pm ---is the 2445 a better bet as far a maintainability over the next ten years or so? Or is this a silly question?
--- End quote ---
Sure, a 2445 (or 2465) has fewer things to go wrong. Not a huge difference though.
Re: the 2445B, did you double check all the internal cables and make sure they were plugged in properly?
j ferguson:
i only removed the A5 board to fix the smd caps and remove the dallas nvram, install a socket and the FRAM I replaced the Dallas with. When it didn't work I replaced the Dallas NVRAM but it didn't make any difference. it seems possible that one of the ribbon cables may have gone intermittent. there are also some shakey looking cables which are part of the GPIB option. I guess it would make sense to see if all of these have conitinuity and aren't sorted. the advantage of getting another 2445b in addition to all the parts is that if it is working now, i can use it to see if my A5 is actually ok.
thanks for the idea.
john
peter-h:
Just a little update of an old thread, since the situation with these Tek scopes has changed a bit.
The hybrid modules seem plentiful on Ebay, and quite cheap (tens of $) presumably due to plenty of scopes being parted out. A good 2465B may fail but isn't usually expensive to repair.
A late-model 2465B will be mostly as good as new inside.
At work, we spent 4k on a Le Croy 4Gsps digital scope which blew up (some BIOS error message) after 1.5 years. It was done in warranty but if/when it blows up again it will be cheaper to buy a 15 year old Tek digital scope which was 15-20k $ new!
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