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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb1049.txt
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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 # 1049
MODEL: TS-850S
SUBJECT: "Click Noise" with Notch On
Symptom: When a strong signal of S-9 or greater is received at the antenna
terminal with the NOTCH circuit ON a "clicking" noise might be noticed.
This is caused by excessive response in the AGC loop circuit.
Countermeasures: The changes detailed below will add additional delay to the
AGC circuit and reduce or eliminate this tendency.
Parts Required:
Qty Description Old PartNo. New PartNo. Circuit Description
1 22 k Ohm chip resistor RK73FB2A103J RK73FB2A223J R289
1 0.47 uF capacitor N/A CQ92M1H474K NA
Procedure:
On PC Board X48-3080-00 (Foil Side) change R289 from 10K to 22K.
Add the 0.47 uF Cap across C43.
Caution: This modification requires advanced sufface mount soldering
equipment that is rated for CMOS circuits. It also requires familiarity
with advanced sufface mount soldering techniques. If you do not have the
proper equipment or knowledge do not attempt this modification yourself.
Seek qualified assistance from your closest Kenwood Service Center
(Long Beach, CA, or Virginia Beach, VA).
Time required for this modification is 60 minutes or less.
Service code A:09 B:X48-3080-00 C:C43 D:91