Noel,
this is something every '34 owner must go through. Welcome to the club ;-)
Joerg
Am 29.03.2016 um 13:19 schrieb Noel Chiappa:
  So, something I just found out the hard way, while
debugging another
 'situation' with a PDP-11/04:
 The KY11-LB Programmer's Console maintainence manual contains a major error,
 in describing the configuration of the 20-conductor flat cable that connectors
 the front panel and the UNIBUS interface module (M7859). This is covered in
 Chapter 9, "Installation", which includes two figures, Figures 9-4 and 9-5.
 Those figures show the 20-conductor flat cable with the red edge stripe
 toward the outer edge of the front panel PCB (correct), and also toward the
 outer edge of the M7859 (WRONG). On the M7859, the red stripe edge needs to
 be oriented _away_ from the outer edge of the board.
 If it is plugged in as shown in these figures, the machine will not operate:
 the four 'RUN/SR DISP/BUS ERR/MAINT' lights will be on, but nothing else, and
 it will not respond to any keys. Fortunately, plugging the cable in reversed
 does not damage anything; simply reverse the cable.
        Noel