Programming interface schematics for Kenwood :
Programming software for Kenwood TS-820 (TS 820 TS820) :
PDF User Manual for Kenwood TS-820 (TS 820 TS820) :
PDF Service Manual/schematics for Kenwood TS-820 (TS 820 TS820) :
The DS-1A DC-DC converter for the TS-820 series and TS-520/S has been replaced by a new model, the DS-2. Wiring color code is the same. Physical size is smaller. Two additional mounting holes must be drilled in the transceiver rear panel.