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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:
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!
At Keithley 2000 I measured all voltages after repair manual is within the tolerances , reference voltage of 7V (U141 LM399 ) which I suspected is 6.98 , the more I replaced several of the analog IC's (mux-u163, u165 ADC, u113, u115, u129, u166, u132 operational amplifiers) but errors not disappeared . At the same IC's Keithley 2015 functions without error , or something I'm missing and do not know what , any idea is welcome.
For the many errors found defective circuit is about R271 = TF-245, but do not know what the equivalent circuit can replace, repair manual specified as RES NET circuit. I compared it with ohmmeter with a good track but we found significant differences may be a range of electrical resistance, but do not know any pin configuration and no values??. As measured with the ohmmeter does not look like a typical resistive area.
Any idea is welcome.
Thank you very much
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