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World of Ham Radio 1997
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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 # 999
MODEL: TS-950SDX
SUBJECT: No Beep in Headphones
Background:
Several owners of the TS-950SDX have reported the absence of an audio
confirmation tone when using monaural headphones. The tone is present
when listening with stereo headphones but only from the right hand speaker
element.
Cause:
In this design the SUB AF PA circuit supplies audio when using a monaural
headphone, and the MAIN AF PA supplies audio to the right speaker of a
stereo headphone. The audio confirmation tone is not applied to both the
SUB AF PA and the MAIN AF PA. To simplify circuit design the tone is only
routed to the MAIN AF PA. Unfortunately this left monaural users without
a confirmation tone and stereo headphone users with a confirmation tone
only in the right side of the headphones.
Corrective Action:
The following modification permits the user to hear the audio confirmation
tone from both sides of a stereo headphone and from a monaural headphone.
WARNING: This radio uses micro-sized surface mount components, and/or
multi-layer circuit boards. If you are not familiar with the techniques
for service of this type of equipment do not attempt this modification
yourself. You will invalidate your warranty if you attempt to modify the
equipment and damage the radio. If you are at all in doubt about your
qualification to perform this modification you should seek qualified
assistance.
Required Parts:
R138: 100K radial lead 1/4 watt resistor RD14BB2C104J
Procedure:
1. Unplug the DSP Unit from the rear of the transceiver.
2. Remove the top and bottom covers (18 screws.)
3. Remove one screw from each side of the front panel and tilt the front
panel forward.
4. Add R138 from the wiper arm of VR1 to the negative side of C39. Use
insulating tubing on the resistor leads.
5. Reverse steps 1 through 3 to reassemble.
This modification may be covered under warranty.
Time required for this modification is 1 hr or less.