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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 # 56
MODEL: TS-180S
SUBJECT: DFC ERRATIC OR HUM
For complaints of either induced power supply hum, or intermittent
frequency stability while using the DFC, perform the following
changes to the VCO unit X50-1550-00:
*1. Install a 330K ohm resistor between Qll G1 & the 8V line.
Connect from L7 at C12 to Qll G1, at R35.
*2. Replace L12 68uH with new part L40-6831-21.
*3. Replace L13 150UH with new part L40-1541-27.
*4. Install magnetic shield as illustrated. Use the two
existing screws, plus double faced tape to prevent vibration.
* New Part
No adustments are necessary.
Note: On page 37 of the Service Manual, the VCO Board view shows
reversed callouts for Qll & Q15. D & S, and G1 & G2 are
transposed.
This bulletin supercedes previous DFC bulletins
Please notate your Service Manual.