[Test-Equipment] Help- HP 8660A problems

[DJED1 at aol.com]

Anyone out there familiar with the HP 8660 series?  I have an 8660A  with a 
86601A RF plugin.  It's worked well, but I just bought an 86602B RF  plugin 
which I tried out today.  the meter worked, but I got no RF  output.  Sold as 
untested, so maybe NG.  However, when I plugged the  86601A back in, it had no RF 
output either.  Did the 86602B blow something,  or did I damage things when I 
"hot swapped" the modules?   I've got  the service manual for the mainframe, 
but not for the RF modules.  Any  guidance would be greatly appreciated.
Ed  WB2LHI