[R-390] R390A qvs vu meter mod 150 type 8 repair - Complete

[Don Reaves]

Well done, Larry!
Thanks for sharing.

Don


On Fri, Aug 19, 2016 at 8:27 PM, Larry H <dinlarh at att.net> wrote:

> I finally got to work on this meter a little bit.  Thanks Roy, Don, Renee,
> Francesco and Tisha for your suggestions.  I borrowed a drill press and
> drilled (what I hoped and believed were rivets) out a little.  Thanks for
> the suggestion to use the press.
>
> Here's the links to the pictures I posted of it before, untouched, on May
> 23, 2015 8:24 PM:
>
> http://s28.postimg.org/h5d7tqsyl/IMG_6757s.jpg
> http://s15.postimg.org/x29k331yz/IMG_6760s.jpg
> http://s29.postimg.org/fiqt47n0n/IMG_6762s.jpg
> http://s11.postimg.org/wb62rl88z/IMG_6763s.jpg
>
> After I drilled one, I could easily see that they were rivets.  Here's the
> link to the picture after drilling:
>
> https://s3.postimg.org/nn15sx1pv/IMG_7264s.jpg
> https://s4.postimg.org/kc30jownh/IMG_7266s.jpg
>
> I then wrapped the body with masking tape (about 6 layers) to use as a
> prying fulcrum in order to get the face off.  That worked great.  It was
> stuck on with a weak rigid adhesive, which allowed the face to be pried off
> with a little careful pressure with a screw driver between the tape and
> face.  I then removed most of the adhesive around the glass.  It came off
> very easily.  The glass was still adhering to the meter body, so I
> carefully inserted a thin knife blade between the glass and body and
> carefully worked it around the circumference to free the glass.  Here's
> links to pictures showing tape, bezel off and removal of the glass:
>
> https://s3.postimg.org/nn15sx1pv/IMG_7264s.jpg
> https://s4.postimg.org/5idos2lil/IMG_7268s.jpg
> https://s3.postimg.org/ib8snr6dv/IMG_7270s.jpg
>
> After a little examination and manual moving of the needle, it was easy to
> see that the top coiled control hair spring was not in the correct
> position.  The outer ring was coming in contact with the next ring, causing
> it to stick in different places on the low db side.  After careful
> manipulation, I managed to get it good again.  I've been testing it with
> audio from my 390A for a few days, and it's working great.  Sorry I could
> not get a picture of the spring, but here it is cleaned up, painted and put
> back together:
>
>
> https://s4.postimg.org/nybudkfkt/IMG_7276s.jpg
> https://s4.postimg.org/g43q8bkjx/IMG_7273s.jpg
> I glued the glass back on with a very very small amount of flexible glue
> and the same with the bezel.  I applied it with a tooth pick to control the
> amount.  One thing to be careful of is putting the glass in the right side
> down.  The edge of the glass is NOT flat and will only seat correctly one
> way.  If it's put in backwards, the body will not seat correctly into the
> face plate.  I suspect that if too much pressure is applied with the glass
> in the wrong way, it will break.
>
> I'm really puzzled as to how the movement spring got damaged, because from
> all of the signs when I took it apart, I'm the first one to do so.  I did
> buy this from an individual, so who knows how it was handled before me.
> But, the packaging was excellent when it was sent to me.
>
> Regards, Larry
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-- 

Don Reaves  W5OR WD2XSH/15
8101 Barrett Rd. Roland AR 72135
Fiber: 501.244.3574
Radio: 501.952.8573
"I got through grade school, high school, and college without Google."