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                             K E N W O O D
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                        Kenwood Service Centers

   Kenwood Service Corporation             Kenwood Service Center, East
   2201 East Dominguez Street              829 Lynnhaven Parkway, Suite 130
   Long Beach, California 90801            Virginia Beach, Virginia 23452
   Telephone 1-310-639-5300                Telephone 1-804-340-1702

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BULLETIN # 1030
MODEL: TS-50S
SUBJECT: "HELLO" Displayed during TX

Symptom: Occassionally a HELLO message will appear in the display of the 
transceiver when the TS-50S is loaded into an 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 16 vdc.

Corrective Action: 

1. Cut the Final Unit PC Board foil in two places, as shown below. 
2. Add a .1 uF chip capacitor (C125) as shown below. 
3. Add a 10 uH chip ferri-inductor (L102) as shown below. 
4. Add an insulated jumper wire as shown below.

Parts Required:

Description            Kenwood Part No.         Circuit Description

.1 uF Chip Capacitor   CK73EB1E104K                 C125
10 uH Fern-inductor    L40-1001-48                  L102

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.

Time required for this modification is 30 minutes or less.
Service code A:46 B:X45-3460 B/2 C Ll 02 D:91