Yaesu MD-100A8X
                                      

MD100A8X for  FT-1000    FT-1000D    FT-650    FT-736R    FT-747GX    FT-757GXII 
FT-767GX     FT-890    FT-890AT     FT-990     FT-990DC
Technical Support, Yaesu U.S.A

Symptom:
This modification allows the MD100A8X microphone to be used with the FT-990

Component value abd part number. 

IC1       78L05       REG 1C         G1090084
C1, C2    10uF 16WV   Tabtalum Cap   K70140013
C3, C4    .1uF 16WV   Ceramic Cap    K19149025
P1        8Pin Plug                  P1090164
P2        RCA Plug                   P0090544
Procedure:
  1. Remove 4 screws from bottom cover of the MD100A8X.

     
  2. Cut PCB trace on 5V line. See the picture below.

     
  3. Install 78L05 two 10uF and two .1uF.

     
  4. Remove shield side wire from M-GND and solder it to the GND of the 78L05. (Center pin)



     

  5. Make DC supply cable for MD100A8X. See the picture below.

This modification should also work for the following rigs:

FT-1000
FT-1000D
FT-650
FT-736R
FT-747GX
FT-757GXII
FT-767GX
FT-890
FT-890AT
FT-990
FT-990DC

ATTENTION
The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.