Products > Test Equipment
Keithley 2400 SourceMeter review and teardown
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kawal:
I made the official request to Tektronix  to release the drawings for the 2400 SMU .  This design must be at least 25 years old by now and I doubt that they would still want to protect that design.  I think the issue is that the current model is the same model number as the one sold in the 1900s and 2000s but the design must be different since there is a lot of obsolete parts in the older 2400.
Lets see what happens .
Zucca:
Thanks kawal.
+1

#freetheK2400 !

TTi is giving the schematics for old devices to people who ask nicely, I do not know why not all the other are doing the same.
kawal:
I asked nicely but Tektronix  did not  like my request.  Gave me the link to the manual I said I already have.
Here is the reply :

   Techsupport
    Thu, 03/05/20 5:09 pm   
 
    Service manual is what we offer https://www.tek.com/keithley-source-measure-units/keithley-smu-2400-series-sourcemeter-manual. Schematics are not available to general public.

kawal:
Got a new reply from Tektronix but the story is the same.  No we cannot give you schematics.

KI-Support-Apps <ki-support-apps@keithley.com>
Attachments
9:47 AM (5 hours ago)
to me

Hello,

 

Unfortunately, Tektronix and Keithley no longer provide schematics for our products, as they are considered IP that is unavailable to customers.

This policy was instituted before the release of the Model 2400.

The best resource for self-repair is the manual. Otherwise, we would recommend working with our Service Department to schedule a repair appointment.

 

Best Regards,

Jake Austin

Applications Engineer
kawal:
Made major progress after coming back from business trip.
I changed the current DAC and the meter started working . After that changed the overheating Voltage DAC and now the unit seems functional in Voltage ranges.  I  made a rough calibration as the display was out quite a bit out after DAC changes. When all done I will send the unit out for calibration. Dacs are warm but not anything near the temperatures as the old ones.

Next issue is the output always on issue .  I found the issue with that as well. This issue is caused by damaged U253 74HC4094. The output pin 5 controls the output solenoid and it always is high no matter what. Grounding the pin releases the ouput relay.
I checked the U256 which switches current ranges and that works  perfectly.  U255 switches voltage dac and gains for the voltage input amp and seems fine. U254/U252 did not measure as I am not 100% how to check that.

Will need to by some shift registers as next purchase.


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