DECNA / Transciever question - test-drb@ccmp.vtda.org

19 Dec 1999

On Dec 18, 23:05, Zane H. Healy wrote:
...
  Not a good day, was working on my PDP-11/73 this
morning, 
...
  investigation shows I'd apparently smoked a
Transceiver, and blown the
 fuse on DECNA Cab Kit. 
I have days like that... I seem to have an unfair share recently :-(

...
  So did the Transceiver take out the fuse?  I assume
so, the three LED's are
...
  lit on the DECNA, but what little doc's I've
found on the card doesn't tell
...
  me if that is good or bad.  The transceiver definitly
has a smokey smell to
...
  it. 
I don't know what the lights mean, but I've seen transceivers on Suns take
out the corresponding fuse.  I'd remove the transceiver, replace the fuse,
and see if the voltage on the AUI connector is OK.  Pins 1,4,6,8,11 should
be ground, and pin 13 should be +12V.

...
  Now why on earth would a transciever blow? 
Possibly a short on the cable, but usually it's caused by surges (eg due to
induced current from a nearby lightning strike).

-- 

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York