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TH-K2AT/K2E/K2ET
DISASSEMBLY FOR REPAIR
Soldering the antenna terminal
1. With the shield cover removed from the antenna terminal section, install two screws on the PC board and bring the PC board into contact with the chassis (z). 2. Solder the antenna terminal with a soldering iron (x). 4. Apply the tips of soldering irons to all the four pins of the final FET at the same time (c), heat them sufficiently, and remove the final FET (v). (Two persons should be required to do this.)
x z
v
c
5. Remove all PC boards from the chassis. 6. Confirm that there is no space between the radiation plate installed on the foil side of the TX-RX PC board (TX-RX unit A/3) and the PC board (b). If there is any space between the radiation plate and PC board, eliminate it by applying the tip of the soldering iron to the radiation plate. 3. Remove the two screws installed in step 1 above, and install the two screws again on the PC board together with the shield cover (c).
b
Radiation plate
c
TX-RX PC board 7. Apply the tip of the soldering iron to the installation side of the radiation plate of the TX-RX PC board, put a little amount of solder to the radiation plate that is seen through a square hole in the final FET installation section and melt the solder (n). 8. When the solder in step 7 is melted, place the final FET on the PC board by aligning it with the silk of the final FET installation section of the PC board (m).
Replacing the final FET (Q12)
1. Remove the two screws holding the shield cover of the final FET section (z). 2. Remove solder from the shield cover completely with a solder absorber. (E and E3 types only) 3. Remove the shield cover (x).
m n
z x
9. Release the soldering iron and confirm that the final FET and radiation plate have been soldered. 10. Solder the four pins of the final FET with the soldering iron. 11. Install all the PC boards. 12. Reinstall the shield cover removed in step 3 above in its original position and install two screws. 13. Solder the shield cover to the PC board. (E and E3 types only) 14. Install the chassis on the case assembly and assemble them. 15. Readjust transmission power. Note: Since the FET is sensitive to static electricity, always wear a grounding band. Use a highly insulated ceramic heater solder iron.
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