[1000mp] AW: MP Display issue

[Uwe Fleischer]

Hi Garry,

I never opened the display of a FT-1000 and I have no techdoc about it. But
due to the fact, that nobody answered your question, here is one general
thought that was in my mind, when I read about your problem. Maybe it helps
or at least gives you a hook.

At the moment, I'm also not sure, whether the display of the FT-1000 is a
LCD or not. But in conjunction with LCDs, you can often see a thin
rubber-layer between the PCB and the glass carrier with the LC-figures. This
rubber-layer has a lot of small pad-areas, enriched with some kind of
carbon, and these carbon pads work like contacts, to form a kind of
3D-connection between the PCB and the glass carrier with the LC-figures.
If you find a construction like this in the FT-1000, chances are, that the
problem is only on a mechanical basis. Maybe the rubber layer was a little
bit "displaced" by a shock, e.g. putting the package with the FT-1000 a bit
too hard on the floor. Another idea is, that some of the contacts on the PCB
got some oxidation on their surface and therefore the electrical connection
is not working properly. 
I hope that somebody could verify or discard these hypothetical thoughts by
a look into the service documentation. IMHO you need to look into
appropriate techdoc anyhow, because one of the first decisions to make is:
is it a problem of the display itself, a contact problem or a problem of
display drivers. This decision can often be made by simple voltage
measurements. But you need to know, WHERE exactly to measure and therefore
the brief study of techdoc is a must in this case. Again: because the error
occurred during storage, chances are not too bad, that it is only a contact
problem.

Please excuse my English, which is surely sufficient for some smalltalk, but
sometimes not perfect enough to explain more complex details. Nevertheless I
hope, I was able to express my thoughts ;-)

gl es 73 de Uwe, DL8UF



-----Ursprüngliche Nachricht-----
Von: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
Im Auftrag von Garry Shapiro
Gesendet: Mittwoch, 10. Oktober 2007 05:32
An: All about Yaesu 1000mp
Betreff: MP Display issue

I own two original MP's, but am not (yet) an SO2R station, so one 
normally sits in the closet as a spare. A year ago both were used in SS 
as part of the NCCC HMO strategy--a second callsign requires a second 
transmitter.

The more recent unit has been the one on the operating desk. Last week, 
preparing for the Cal QSO Party, I was setting up a new MicroHam MK, 
which derives its DC power from the MP's 13.8V output jack. Alas, this 
jack was dead, the internal fuse blown. I had not used that jack before, 
had not tested it, and have no idea whether the failure occurred on my 
watch or with the prior owner, which of course does not matter.

Happily, I had the original MP and swapped it in. Unhappily, when I 
powered up that MP, 13.8V was present but I found I had three stuck LED 
segments on the Main frequency display. I had never seen that anomaly 
before. The closet that held the radio is interior, dry and always at 
indoor ambient; nontheless,  the failure appears to have occurred during 
storage. This radio has been to Rodrigues and other places and was 
always reliable, except for an oft-discussed front-end relay issue . To 
have it fail while it was sleeping is ironic and disappointing.

The stuck segments make the display confusing, indeed. During the 
contest, I relied upon Writelog's frequency display to keep my sanity.

I need to get this fixed--and I presume display replacement means big 
bucks. Any thoughts re what might have caused this failure? Are there 
any recommendations for last-gasp procedures I might follow before 
sending this radio off to Yaesu or someone else?

Garry, NI6T
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