-=> On 03-08-98  09:53, Ed Kriston said to All,<=-
-=>"About Yaesu FT-102 problem...,"<=-
 
Hi, Ed;
 
 EK> I have an FT-102 that has a small? problem.  It only receives part of
 EK> the time. I suspect a problem in one of the TR relays.  It was
 EK> receiving the other day  after tapping all the relays in sight.  Put it
 EK> in tune position and transmitted into a Yaesu YP-150 dummyload
 EK> wattmeter and now it doesnt receive again.  Tapping the relays doesn't
 EK> bring it back.  If things remain the same, it will  receive again one
 EK> of the next 50 startups with the power switch.  Any ideas?   
 EK> I would really like to keep this rig for base operation.  It seems
 EK> that it has  some really nice receive tuning features for an older
 EK> radio.  Any input on  having used this radio would be appreciated.
 
Try this: First open up all the relays so that you can get to the
contacts.  Then cut some harrow strips from a common brown paper bag,
(like you get at the grocery store), and use them to clean the contacts.
Simply slip a paper strip between each pair of contacts, press the
contacts tightly together and pull the paper through.  Open the contacts
BEFORE you come to the end of the paper so that they don't snap together,
or you may drive any impurities, (dust, etc), into the contacts instead
of removing it.  Do this several time for each pair of contacts, at least
3-4 times or until the paper no longer shows a dark mark.  If the problem
is caused by dirt/dust in the contacts, or if the contacts have become
oxidized this should cure the problem.  It is also possible that the
spring tension is out of adjustment in which case it can probably be
adjusted, a spring could have come off, or a relay could just be worn
out.  (Has the unit seen a lot fo service?)
 
Another possability is that a transistor has become intermittant, in
which case it will require signal tracing to isolate the intermittant
stage.  The way you described the intermittant nature of the receive
would suggest to me that this is the likely cause.
 
N3WJA DE KB9QPM
   Ivy
 
 
 
... The problem with troubleshooting is that trouble shoots back.   :-}
 
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           ³  SysOp: Ivy's WALL BBS - 6 Networks 920-457-9255  ³
           ³             IMHO: 5 WPM for EVERYONE.             ³
           ³           KB9QPM/AE as of 11/19/97 :->>           ³
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