TK-8150
11
INSTALLATION
9. Special Instructions for Replacing the
Final Amplifier Q5
To replace the Final Amp Q5, ensure to follow the instruc-
tions given below:
9-1. C77 and C78 Positions
1. Ensure to solder C77 and C78 to securely contact Q5.
Note :
The TX power may vary depending on the position
of C77 and C78.
9-2. Soldering
1. Ensure to solder C77 and C78 with the earth spring legs as
illustrated in Fig. 9-3.
Note :
Use excessive solder to make it thicker than the
the electrodes of the chip.
2. Solder the terminals until the electrodes of the chip are
fully covered. (Refer to Fig. 9-1.)
Note :
Use excessive solder to make it thicker than the
the electrodes of the chip. (Refer to Fig. 9-2.)
3. To solder the source side of C78 (FET Q5 source side),
solder the earth springs until they are fully covered. (Refer
to Fig. 9-4.)
C77,C78
NG
C77,C78
OK
C77,C78
NG
C77,C78
OK
PCB
Top view
Side view
C77
C77
C78
C78
Q5
Metal plate
Metal plate
Solder
Solder
Solder
Electrode
Connect with solder
The C77 and C78 must
contact securely the
Q5 package
OK
Top view
C77
C78
Q5
The C77 and C78 must
contact securely
the Q5 package
Fig. 9-1
Fig. 9-2
Fig. 9-3
Fig. 9-4
