TH-77A Mods
 

1- Disconnect the battery and antenna. 

2- Remove the tree case screws and two battery plate screws.

3- Lift front panel from radio. Do not disconnect flex cables. 

4- REMOVE chip resistor R-128 and R-129. Capacitor C-124 may be glued 
down over these resistors. You may wish to unsolder the capacitor to avoid
tearing the flex board foil traces.

5- Reassemble the radio.

6- Reset the CPU

NOTE: AM sensitivity is typically less than 1uV for 10db S+N/N.

CROSS BAND OPERATING PROCEDURES: Turn ON / OFF the repeater mode.
Press and hold the [ SUB UP ] key and turn power on.

ATTENTION
This modification are sent to KB2LJJ. I have no responsibility for any damage during the modification or for any wrong information made on this modification.