I presume you mean the illuminated push switches on the various plug-ins? If so then I'm afraid the answer is nowhere on the 3-slot chassis!
I believe the reason was a shortage of power in the 'smaller' mainframe but do not despair, Tek produced an app note/mod sheet (040-0686-01) that tells you how to add a standard voltage regulator to provide it.
If you google 'tektronix 040-0686-0' you will find it.
Have fun!
Adrian
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On 2/28/2018 2:44 PM, lop pol via Groups.Io wrote:
I have no lights but I know they work. Im assuming because p10 is empty. I have looked at the schematic for hours but I cant figure out where the input to p10 comes from.
