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World of Ham Radio 1997
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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 # 1032
MODEL: TS-450S/TS-690S
SUBJECT: TS-450/690S Low Mic Gain w/DSP-100
Symptom: Proper microphone gain/ALC readings cannot be obtained unless the
user adjusts the TX GAIN potentiometer on the rear of the DSP-100.
This irregularity is caused by an instability of the DSP-100 MIC amplifier
(IC-5).
Corrective Action: Replace capacitor C200 on the IF unit (X48-3090-11)
with R300, a chip jumper wire. This capacitor locoated on the foil side of
the PC Board near the DSP Connector.
Parts Required:
Description Part Number Circuit Description
Chip Jumper R92-0670-05 R300
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 1 hour or less.
Service code A:35 B:X48-3090 C:R300 D:91