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Keithley 6485/6487 teardown

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Minikisscool:
Hi,

I have a 6485 which is not working.
There is no display of value.
Error reading Read command in GPIB (timeout)
I read all topics here, used preamp schematic v2 to check input
preamp is working, I have proportional voltage on analog output


I look to check ADC, it's OKI component (2000-802A04)
In my board, it's a bit different, it's a new version 2X00AD component.
Does anyone have documentation on this component or old version ?


Thanks in advance

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