From: "Mike Williams" 
Subject: [drakelist] DR-7 Display


"Mike Williams"  made an utterence to
the drakelist gang
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Thanks to all who offered advice on the digital display on my TR7 which =
was ( is) going bonkers.  The problem was that after an hour of warm up =
the display would start to display random digits  very rapidly.  The =
radio was still on frequency.  To complicate matters, I tried the =
counter function with a wire in the back of the ext  counter connector =
and switch set to EXT. for the external counter function.  Sometime the =
counter display worked properly with a 144 MHz signal input and =
sometimes not.  Tested dc voltages and tried to signal trace but my =
scope's bandwidth prevented any solid measurements.  Finally isolated =
the problem down to U9013 on the DR7 board by blasting it with freeze =
mist; repeated this test numerous times with the same results.  Looks =
like a thermal intermittent.  Here is the question;  anyone know where I =
 can find this chip?  MC 10138 P is stamped on the top of the case and =
the Drake parts list just calls  it a 10138.  I have searched a few =
electronics sites with no avail. =20


Thanks much,

Mike W4DL
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Thanks to all who offered advice on the digital =
display on=20
my TR7 which was ( is) going bonkers.  The problem was that after =
an hour=20
of warm up the display would start to display random digits  very=20
rapidly.  The radio was still on frequency.  To complicate =
matters, I=20
tried the counter function with a wire in the back of=20
the ext  counter connector and switch
set to EXT. =
for the=20
external counter function.  Sometime the counter =
display worked=20
properly with a 144 MHz signal input and sometimes not.  Tested dc =
voltages=20
and tried to signal trace but my scope's bandwidth prevented any solid=20
measurements.  Finally isolated the problem down to U9013 on the =
DR7 board=20
by blasting it with freeze mist; repeated this test numerous times with =
the same=20
results.  Looks like a thermal intermittent.  Here is the=20
question;  anyone know where I  can find this
chip?  =
MC=20
10138 P is stamped on the top of the case and the Drake parts list just=20
calls  it a 10138.  I have searched a few electronics sites =
with no=20
avail.  
 
 
Thanks much,
 
Mike
W4DL

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