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Keithley 2000+2015 THD

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costas:
Hello,
 
I have two flawn Keithley multimeters:2000 and 2015THD. For the 2015THD I would need the content of the two memories of 27C020 ( U156 , U157 version B07 ). It starts when I put the memories from 2000 but i don't think it is working in the normal parameters...where could I find the memory content? I am willing to trade the Keithley 2000. For the Keithley 2000 I have found the following errors when I run an internal test:
101.2
101.3
200.1
200.2
201.1
201.2
300.1
301.1
301.2
302.1
302.2
303.1
303.2
304.1
400.2
401.2
402.2
403.2
500.1
500.2
600.1
600.2
601.2
Do you think that there is a possibility for reparing the Keithley 2000? Maybe with a scheme...but I didn't find one! I could really use some advise from more experienced peers in the field!
 
Thank you very much!

Costas

free_electron:
if you have all of those errors then most likely one of the supply voltages is missing so the analog section is misbehaving.
to actually have all these errors in 'part defects' half of the parts would need to be broken...

check the supply voltages.

costas:
Thank you for reply , I will verify the power supply ...
About 2015 working  memory dump where I can find ? Maybe somebody try to read from personal device .

Costas

muvideo:
Hello, I have a 2015, check my teardown in this forum:
https://www.eevblog.com/forum/product-reviews-photos-and-discussion/keithley-2015-teardown

I think my fw is a different revision, dont know if
they are compatible and board rev. are the same.
I have a (low cost) eeprom programmer, but I dont
have a plcc adapter around now.
If I find how (safely ) dump I'll send you the dumps.

Fabio.

costas:
Hello,
I saw your teardown , I found very interesting ... your version is B15, if it works with dump from 2000 do not see why it would not work with a newer version from 2015, however if you have a backup dump is great for "accidents". To check if they read well you can clone in two sites 29F020 flash (29F040, or eeproms 28F020, 28F040, 28C020 , 28C040) that you have on hand without disturbing the OTP's whether or not reading and writing well
And I'm still use a low cost  programmer (willem) I was able to read well, with professional programmer - labprog 48 - I was just checking errors for AT27C020
Thank you
Costas

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