TS850S KENWOOD TS-850S EXPANDED RF REMOVE SCREWS FRO BOTTOM AND TOP COVERS. REMOVE COVERS, CAREFUL WITH SPEAKER WIRES. REMOVE SCREWS HOLDING FROUNT PANEL. PULL FROUNT PANEL FORWARD TO SEE DIGITAL BOARD. LOCATE AND CUT DIODE D11. REASSEMBLE THE RADIO. RESET MICROPROCESSOR BY HOLDING A=B AND TURNING ON RADIO.