TH-K2AT/K2E/K2ET
3
DISASSEM BLY FOR REPAIR
Soldering the antenna terminal
1. With the shield cover removed from the antenna terminal
section, install tw o screw s on the PC board and bring the
PC board into contact w ith the chassis (
z
).
2. Solder the antenna terminal w ith a soldering iron (
x
).
3. Remove the tw o screw s installed in step 1 above, and install
the tw o screw s again on the PC board together w ith the
shield cover (
c
).
Replacing the final FET (Q12)
1. Remove the tw o screw s holding the shield cover of the
final FET section (
z
).
2. Remove solder from the shield cover completely w ith a
solder absorber. (E and E3 types only)
3. Remove the shield cover (
x
).
z
x
c
z
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.)
5. Remove all PC boards from the chassis.
6. Confirm that there is no space betw een 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 betw een
the radiation plate and PC board, eliminate it by applying
the tip of the soldering iron to the radiation plate.
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 w ith the silk of the final FET
installation section of the PC board (
m
).
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 w ith 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 tw o screw s.
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 pow er.
Note:
Since the FET is sensitive to static electricity, alw ays
w ear a grounding band. Use a highly insulated ceramic
heater solder iron.
Radiation plate
TX-RX PC board
b
c
v
m
n
