HISTORY:
Keithley Instruments (USA) specialise in high quality data acquistion equipment and have been around since the mid 1940’s. Around 2010 the company changed ownership and became a subsidiary of Tektronix.
This active backplane provides matrix switched input/outputs from the user installed 70xx series (and 3rd party) cards installed in the system.
Unlike the other modules in the 7002 which I have ‘parted out’ due to issues with the VFD and one SMPS module, I have NOT been able to test this backplane as I no longer have any cards!
The best I can offer in this regard is the fact that the system WAS fully functioning at the previous owners facilities prior to their decommissioning of the equipment.

KEITHLEY INSTRUMENTS Data Acquistion Switch Mainframe SPARE PART
Model: 7002
Part: Backplane Module A76503 (daughter board mounted on the rear A82092)
Active devices are multiple 74HCT154’s (4 to 16 decoder/demultiplexer) and UCN 5841’s (8 bit serial latched drivers)
PCB is clean and undamaged
Before servicing your 7002, follow ESD safety measures
It would have been nice to undertake testing myself, prior to dismantling the system but this backplane could not be checked as I have no cards left BUT rest assured, the complete 7002 this came from was working 99% but was only dismantled due to an issue with the VFD and one of the SMPS modules.

To ensure this A76503 backplane module remains in pristine condition, it has been placed within a sealed ESD bag and it will be supplied this way.