[time-nuts] FTS 4100 (4050/4060) Service Information?

[John Ackermann N8UR]

I recently acquired a couple of FTS 4100/S12 cesium frequency standard 
modules.  These are, I've been told, basically the guts of a 4050 (and 
maybe 4060?) commercial standard repackaged for military "fly-away" use. 
  They run from 22-30 volts and have a couple of switches and a meter 
jack, but no front panel.  I have two units that both seem to lock up, 
though both have minor glitches, and a third once worked but recently 
stopped locking; I'm trying to fix that one for a University group.

I have some very basic operations-level documentation for the 4100, but 
nothing that helps with troubleshooting or repair.

Does anyone here have a service manual that covers the 4100, or much 
more likely, the "CFS" package of the 4050 or 4060?  A scanned copy 
would do the trick very nicely.

Thanks!

John