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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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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 # 1016
MODEL: TS-950S
SUBJECT: Hum with Monitor ON
Symptom:
On early versions of the TS-950 series a hum might be heard when the MONI
function is active and headphones are connected to the PHONE jack. No hum is
experienced when the MONI circuit is OFF.
Cause:
This noise can only be found in the monitor circuit itself and not on the
transmitted signal. We have found that the VCO shield cover for the PLL unit
might be contacting the shield plate for the filter unit. This physical
contact can allow a slight amount of vibration to be felt in the sub-receiver
section. This vibration, combined with too much gain in the sub-receiver
section contributes to the hum.
Parts Required:
Qty Description Kenwood Part No.
4 Low profile PLL Unit cover screws N35-2640-05
Procedure:
1. On the IF Unit (X48-3060-00) adjust VR-1 to the point the audio output
just decreases when the MONI circuit is activated.
2. Replace the screws on the VCO Unit shield case with the new low profile
screws.
Time required for this modification is 15 minutes or less.
Service code A:09 B:X48-3060 C:VR1 D:91