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HP8753E GPIB I/O problem?

Question asked by FM on Jul 3, 2009
I just bought a nice 8753E but found out that the GPIB interface is not working.  I looked inside and each line on the GPIB bus is protected with clamping diodes.  The VCC+ for each clamping diode is 0.7 volt???? I will like to follow that VCC on the board but it is hard without schematic.  Is somebody have a PDF format for the Service Manual at Components Level with schematic?  If the PDF format is not available, can I buy the manual somewhere?
Thank you