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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 # 869
MODEL: TS-930S
SUBJECT: PLL Unlock
Some users of the TS-930S have reported a problem where the PLL will
sometimes not lock (digital display does not come on) if the power switch
is turned off and on while xx.499.9 MHz is displayed, after the unit has
warmed up. This may occur also in the FSK mode.
This may be caused by detuning of VCO-2 and VCO3 in the PLL unit (X50-1880-
00). This may be cured by a simple increase in the voltage obtained in the
PLL alignment procedure. Make the following change in your service manual.
Service Manual page 58.
3. VCO-3 T14 change 3.7v to read 4.2 vdc
4. VCO-2 T15 change 3.0v to read 3.5 vdc
Notes: 1. Be sure to adjust T14 and T15 of VCO-2 and VCO3 whenever a PLL
related circuit is serviced.
2. This change applies to units before S/N 306XXXX.
3. Installation time for this change is 1/2 hour or less.