[Collins] R-390 (non A) Crystal oven access!

[Dr. Gerald N. Johnson]

Somewhere there must be a manual on repair of modules. The TM-11-856 
manual that I just downloaded from www.jamminpower.com/PDF/TM11-856.pdf
has some tantalizing illustrations with the crystals exposed and 
identified. But I didn't find any obvious description of how to get 
there. This is a huge but very high quality scan. Takes about 180 MB and 
a long time to down load. About 20 seconds per megabyte. I didn't find a 
reference in it to other manuals.

The TM 11-5820-357-35 manual from 1962 references TM 11-5820-357-20, 
organizational maintenance manual, but I think TM 11-5820-357-20P, 
organizational maintenance repair parts and special tools lists and 
maintenance allocation chart, may show were to find those module service 
manuals. I haven't looked for these.

On 1/28/2014 1:33 PM, K3PID wrote:
> I need to replace Y404&  Y408 in my R-390. I’ve followed the manual to get the Crystal Oscillator subchassis out and remove the cover from the oven ... BUT I can’t figure out how to open up the oven to replace the crystals. Any help will be appreciated!!
>
> Ron K3PID
> ______________________________________________________________
>
73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association