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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 # 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