Re: Mazda 626, Fujitsu tuner

From: Wayne Tiffany (wayne.tiffanyRMVJUNK_at_asi.com)
Date: 11/29/04 

Date: Mon, 29 Nov 2004 08:11:24 -0600

A bit of further observation. I have had the radio installed since the time
of this post and after paying attention to it, I find that it works ok if
the temperature is below about 75° F, and also above about 40° F. I've seen
devices become sensitive to being too hot, but never one that would also
quit at a low temperature. Any more thoughts?

Just another note - I have gone over the boards under a microscope and found
no solder problems.

  WT

"Wayne Tiffany" <wayne.tiffanyRMVJUNK@asi.com> wrote in message
news:2q6a6nFrv24lU1@uni-berlin.de...
> I have a Fujitsu Ten modular radio (Model AE-3050TY1A, S/N 9102692) in my
> 1985 Mazda 626 and the tuner has developed a problem. It would
occasionally
> lose its presets, as in clearing its memory. My first thought was that
the
> constant +12 supply line was dropping, but I caught the tuner blanked out
> one time when I had the meter hooked up, and the supply was still there.
So
> then I thought maybe it was a cracked solder joint, but a trip of all the
> boards under the microscope found none.
>
> I have checked the ESR of all the major caps and all appear to be ok. I
may
> have missed something there as I just received & built my ESR meter over
the
> weekend. But I compared caps of similar sizes, and also compared to
others
> I had, and I didn't find any that raised alarm.
>
> The original symptoms started about a year ago, but were so random that I
> could never catch it being bad long enough to do any more than wiggle
wires,
> etc. Now it finally totally quit, so whatever was deteriorating, finally
> quit.
>
> Has anyone been through one of these? Any guesses out there? Schematics
> available? Thanks for any help.
>
> WT
>
>