Service BulletinAmateur Radio Division

Subject: TS-120S - Final ProtectionDate: July 27, 1979

If for any reason work is performed in the Final unit, install two additional parts to the Filter unit X51-1200-00.

This will improve protection action.

  1. Remove top and bottom covers.
  2. Remove Final unit (6 screws).
  3. Filter unit X51-1200-00 will be exposed. Install between Q3 Base, and TP-1, series wired diode and resistor D14 and R34.
No adjustments are necessary.
New Part number
D14 1S1555 V11-0076-05
R34 4.7K ohm

©1979 Kenwood