[R-390] VU Meter Issue...newbie on first 390a

[Larry H]

Hi again David,  Forgot another easy possibility for the VU mtr - check the 'line meter' switch contacts and the 'line gain' pot.
Regards, Larry
      From: Larry H <dinlarh at att.net>
 To: 390 List <r-390 at mailman.qth.net> 
 Sent: Wednesday, April 6, 2016 9:12 PM
 Subject: Re: [R-390] VU Meter Issue...newbie on first 390a
   
Hi David,  Congratulations!  Welcome to the group.
For the VU mtr - have you checked the jumper on tb103 11 to 12?  If yes, do you get audio on 10 and 13?  If no, replace V604 and then  V602.  If yes, check for audio on the VU mtr terms.  No need to disconnect it.
As for cleaning the inside of our mtrs - some are easy to open and some are NOT.  Just be careful with any possible dust from the inside - you don't want to breath it.  A simple nose and mouth filter should be good, if concerned.  If you're careful, you should not need one.
Good luck.
Regards, Larry

      From: R. David Eagle via R-390 <r-390 at mailman.qth.net>
 To: 390 List <r-390 at mailman.qth.net> 
 Sent: Wednesday, April 6, 2016 7:22 PM
 Subject: [R-390] VU Meter Issue...newbie on first 390a
  
Hello all...Today was my first day of powering up my very first motorola 390a that I have been slowly working on over the last year.  I went through and checked all tubes with my tv7 and found a couple that needed to be replaced.  Today was the day that the speaker finally got hooked up and the rig warmed up.  Much to my surprise, I was copying cw on 40 after a few gleaming moments.
One thing I noticed though, was my VU meter was not working what so ever and I have searched around for common fixes/problems but haven't turned anything up.  Is there any common problems to look for outside of replacing the meter?
Also...I noticed that the carrier meter has a film on the inside of it that is almost brown.  I am somewhat reluctant to pull it apart due to the whole radioactive particle scare, but are these easy to disassemble and clean?


Thanks in advance,
DaveKB8NNU
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