[Yaesu] FT-1000 Tuning Upgrade Kit Instructions from International Radio Services

Paul Christensen w9ac at arrl.net
Mon Jun 1 13:43:13 EDT 2015

Thanks to all who came to my rescue with offers to help.  John, GW4SKA just
sent me the .PDF scans.  With that, hopefully I can make some good progress.

The oddity to the FT-1000D's memory loss is that the back-up battery voltage
appears all the way to the one and only connection point and that's the
28-pin RAM chip.  Through a steering diode, that point is in parallel with a
+5V source from the power supply for memory operation while the rig is
running.  So, all normal there.

All I can figure is that the back-up core
of the RAM isn’t loading.  The Yaesu service manual is of zero help; there's
no description of the load/recall.  However, while the rig is powered on and 
making panel changes, it
does retain frequency, band, memories, etc.  But all is lost at power-up and 
reverts to 7.000 MHz on both VFOs.

I'll post results when I find the root cause.

Paul, W9AC 

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