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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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1997-02-01
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
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
==============================================================================
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