YAESU FT990 - 1.5 to 30 MHZ TX mod:
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-Open FT990 like explained in your OPERATING MANUAL.
-Localise JP5002 on "CONTROL UNIT" and close it with solder.
-If no transmit between 4 to 6.5 MHZ and 8 to 10 MHZ, do the following:
1) Display 5.5 MHZ in CW mode, "meter selector" to ALC, push "MOX" button and adjust VR1003
on "RF UNIT" for normal ALC meter deflection.
2) Display 9 MHZ and do the same with VR1005.
F1LOU @ ON7RC.BT.BEL.EU
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Note: I havent tried or verified this, proceed at your own risk, and do not transmit outside of legal bands!