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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 # 1046
MODEL: TS-850S
SUBJECT: Mixer FET Change 

Symptom: Several units were discovered during production by our QC department
that experienced difficuty when the transceiver was being adjusted for an 
S-1 reading on the S-Meter.

Countermeasures: Variations in the gain of the devices used for Q16 and Q17,
the second mixers, on the RF Unit (X44-3120-00) appear to cause of this 
symptom. We, therefore, recommend replacing these two transistors with 
2SK520 (K43) devices. These devices have lower IDSS (Drain breakdown current),
and therefore provide a greater conversion gain. As a result the total gain 
of the circuit is increased.

Parts Required:

Qty Description         Old Part No.   New Part No.   Circuit Description
2   Second Mixer FET    2SK520 (K44)   2SK520 (K43)   Q16, Q17

Time required for this modification is 60 minutes or less.
Service code A:43 B:X44-3120-00 C:Q16 D:91