[Yaesu] FT-1000 Tuning Upgrade Kit Instructions from International Radio Services
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.
More information about the Yaesu