[R-390] R390A schematics

[pete wokoun, sr.]

Hi all:

  You probably all know about the R390A Y2K manual.   The Y2K manual is 
already in its second release.  This endeavor was undertaken by several 
dedicated 390a enthusiasts:  Al Tirevold, Barry Hauser, and myself.  I 
volunteered redrawing the schematics and sketches into a hopefully, more 
easily read format using standard-size paper.  The originals were done using 
Visio and converted into the manual's PDF format that you download to save a 
lot of file space.  Well, file compression is functional, you do get the 
information but it distorts the drawings a little.

   What I have available are the originals, updated and presented in their 
original Visio format.  If you have Visio they will download into 
good-looking drawings where circles are round, junction dots are clearly 
visible, and text stays readable in its intended fonts and doesn't run over 
into adjacent lines.  If you don't have Visio, you can download a free 
viewer from Microsoft.  They will open in your browser window where you can 
view and print them.

  I also measured the DC current levels on the various B+ lines going to the 
different modules using an HP428B Clip-on DC Milliammeter.  These values 
were added to Fig. 5-11 (Power Distribution Diagram) from the Y2K manual.  
This new diagram is called Power Distribution Current Levels and is included 
as an additional troubleshooting aid.

  These visio drawings are available from my website:

http://www.qsl.net/kh6grt/page4/r390aschematics/r390aschematics.htm

They are available as self-extracting zipped files to save space.  Just 
double click on them after downloading to extract the original .vsd file.

I also have links to the microsoft down-loadable visio viewer and both 
Barry's and Al's websites that have the complete Y2K manual.

This whole undertaking is my first attempt at creating a website so bear 
with me as I try to work out any bugs.  Feel free to let me know of any 
errors you come across or tips on how the schematics could be improved.

regards,  pete KH6GRT

_________________________________________________________________
Compare high-speed Internet plans, starting at $26.95.  
https://broadband.msn.com (Prices may vary by service area.)