TS690S KENWOOD TS-690S EXPAND RF REMOVE SCREWS FROM TOP AND BOTTOM COVERS. REMOVE TOP SCREWS OF FROUNT PANEL. LOOSEN BOTTOM SCREWS OF FROUNT PANEL. TILT FORWARD TO SEE DIGITAL BOARD. REMOVE SCREWS HOLDING DIGITAL BOARD. DISCONNECT CABLES TO DIGITAL BOARD. TILT FORWARD TO SEE BACK SIDE OF DIGITAL BOARD. LOCATE AND REMOVE DIODE D27, CAREFULLY, DON'T DAMAGE TRACES. REASSEMBLE RADIO IN REVERSE ORDER.