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TS-50S "Hello" displayed during TX | Radioaficion Ham Radio

TS-50S "Hello" displayed during TX


kenwood TS-50S "Hello" displayed during TX

Author: Kenwood Communication, inc.

Service Bulletin no. 1030 (29 June 1993)

Occasionally an "Hello" message will appear in the display of the transceiver when the TS-50S is loaded into a antenna without the use of an antenna tuner. This symptom usually occurs when the negative terminal of the power supply is floating (un-grounded for RF). This can result in RF feedback that causes the supply voltage to exceed to 16 Vdc.

Corrective action:

  1. Cut the Final Unit PC Board foil in two places, as shown below.

  2. Add a .01 µF chip capacitor (C125) as shown below.

  3. Add a 10 µH chip Ferri-inductor (L102) as shown below.

  4. Add an insulated jumper wire as shown below.

Parts required:

Qty   Description                          Kenwood Part No.  Circuit description
1 .1 µF chip capacitor CK73EB1E104K C125
1 10 µH Ferri-inductor L40-1001-48 L102

kenwood TS-50S "Hello" displayed during TX

Caution: This modification requires soldering equipment rated for CMOS type circuits. It also requires familiarity with surface mount soldering techniques. If you do not have the proper equipment or knowledge do not attempt this modification yourself. Seek qualified assistance.

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