[Test-Equipment] HP 8553B repair query

[marv_e_ads at juno.com]

On Tue, 23 Nov 2004 12:36:45 -0000 "Alan Melia"
<Alan.Melia at btinternet.com> writes:
> Hi all, I wonder if I can tap into the vast pool of experience here in
the Group
> I have an 8553 unit which is about 35 to 40 dB down on gain. I have
removed
> the A9 unit the 1st mixer and 200MHz amplifier module and want to
disconnect
> the 1st mixer to test the amplifier. The rudimentary test in the manual
> suggests that the mixer diodes are OK.
> 
> I can release the  IF output SMB connector from the mixer to the amp,
but I
> cannot release the two connectors J2 and J3 which are the RF input and
the
> LO to the 1st mixer.  It appears as though the threaded sleeve on the
> connector attached to the mixer module is used to lock the right-angle
> adapter into to top die-cast cover. I can only rotate the "sleeve"
about
> 1/8th of a turn withough it binding. I am cautious of applying too much
> force, this style of connectors usually undo quite easily. I did wonder
at
> first whether the right-angle adapter was an SMB to SMC , but there 
> does not seem to be room for that, and the mixer will certainly not
"pull" 
> off easily.
> 
> Can anyone, who has achieved this kind of repair, supply some ideas /
> encouragement that I am proceeding in the right direction with the
> mechanical disassembly. Am I just being too much of a wimp? does it
require
> more force?
> 
> Thanks for your interest.
> Regards
> Alan G3NYK
> alan.melia at btinternet.com
> 

Hi Alan,
   This is from 20 year old memory... 

   If you have the IF connector loose and remove the two (?) screws from
the back of the mixer then, the assembly should just slip off (down?)...

73 & Good morning,
   Marv  WC6W












*

________________________________________________________________
Juno Platinum $9.95. Juno SpeedBand $14.95.
Sign up for Juno Today at http://www.juno.com!
Look for special offers at Best Buy stores.