Article rights to VE7AVV
The FL-2100Z amplifier referenced in the following images is the 6-Band model covering 10m thru 160m (no WARC bands) and not the 9-Band version that included the WARC bands. I believe YAESU called this an off-shore or export model of the amplifier — but it is definitely a FL-2100Z.
The burned band switch from my YAESU FL-2100Z amplifier
Here is where I believe the (band switch) trouble began….
Use a mirror to examine these parts closely so you can view the bottoms and then replace these weak links with parts from http://www.vcnet.com/measures/ . Install all the parts in the 572B kit.
The original layout
The stock parasitic suppression proved to be a very weak link in the overall design of this amplifier
The yellow arrow points to the burned contacts
A crude, but hopefully informative sketch of the retrofit wiring
I am indebted to John, VE7ML; Dale, VE7SV; and Chuck, VE7WO for their invaluable assistance in making repairs to this amplifier — without them, this amp would likely have become scrap metal.