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Author Topic: re: repairing the 2m pa in a tm-733a  (Read 745 times)
KC7BYP
Member

Posts: 51




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« on: July 13, 2013, 11:19:54 PM »

I got this Kenwood tm-733a asis knowing there is a problem in the 2 meter pa (a s-av17).   It was putting out about 3 to 5 watts when I tested the rig down in my 94 explorer.  I have a 12vdc 10ah gellcell battery in my room.  When it is fully charged up the 70cm works great (though the gellcell doesn't last long on transmit, I need a bigger battery).  The 2 meter side has stopped putting out period,  no reading at all on the swr/power meter.  I need to drag the rig back down to my explorer again were I have more battery power available and run the test again.   If the 2m pa is totally bad now.  How do I find out what went wrong?  I have never opened one of these pa's before.  I have been reading about a small trace on the board that cracks from over heating because of the lack of heatsink compound.  I have heatsink compound from just having replaced the dc converter transistors on a Yeasu FT-101E.

Steve
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W9GB
Member

Posts: 2579




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« Reply #1 on: July 14, 2013, 05:21:02 AM »

KENWOOD TM-733A Service Manual
http://www.pd0jan.nl/index.php?option=com_docman&task=doc_view&gid=1492&Itemid=

Repair of the Toshiba S‑AV17 (and similar) RF power modules (2006)
By Kevin Custer W3KKC, edited by Mike Morris WA6ILQ       
Repeater Builders Technical Information Pages
http://www.repeater-builder.com/kenwood/s-av17/s-av17-repair.html

2002-2010 eHam.net thread on same question (Toshiba S-AV17 repair)
http://www.eham.net/ehamforum/smf/index.php?topic=54808.0

Check with RF Parts, IF you require replacement for Toshiba S-AV17

Icom Part Number: SC1022
Toshiba (mfg) Part number: SAV17
« Last Edit: July 14, 2013, 05:26:28 AM by W9GB » Logged
K9YLI
Member

Posts: 846




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« Reply #2 on: July 14, 2013, 08:42:03 AM »

 I have fixed a couple these  this way.  You need a good solder sucker  to remove the 6 wires to the PA.
then the black  cover just  pops  off..  replace the obvious  blown land pattern with a strand or maybe 2 of  stranded wire.  about  30 to 35 wire size.
reinstall with  heat compound. tighten screws.

 Piece of cake..
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