[Repeater-Builder] IFR-COM120x Service Manual or Schematics

[w2zt]

I'm looking for an IFR-COM120A or COM120B service manual or at least 
some schematics. In particular, I need the Baseband tray schematic. 
Thanks, Eric

[Repeater-Builder] IFR 1900 Schematics

[w2zt]

Does anyone know of a source for the IFR-1900 schematics? I have each 
of the Service, Calibration & Operating manuals, however, schematics 
are not within them.

I assume this is because Aeroflex still supports the units for a 
lucrative fee and doesn't want competition.

Thanks, Eric 

[Repeater-Builder] IFR 1900 Versions 1 - 5

[w2zt]

Does anyone know what the differences are between versions 1 through 5 
of the IFR-1900 CSA?

Thanks, Eric

[Repeater-Builder] IF-1600S self test issue

[w2zt]

Hello,

I have an IFR-1600S service monitor that appears to work properly.

However, when I run its series of self tests, it fails the "low pass 
filter" test. The maintenance manual I have doesn't  contain 
schematics, nor does it speak to any of the self tests. Accordingly, I 
have no idea which of the several low pass filters it's testing and 
which one it thinks is malfunctioning.

Does anyone have any experience\knowledge of the self tests within 
this series of test systems?

Eric