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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 # 856
MODEL: TS-660
SUBJECT: Microprocessor Latchup
Microprocessor latchup may occur if the power switch is cycled several
times in quick succession, if the supply is turned off while the power
switch remains on, or if the power supply is turned on with the transceiver
already on. Symptom will be no display, erroneous display, or locked
display. Change two components on the Control unit to prevent further
trouble.
On the Control unit X53-1220-00:
1. Replace R23 680 ohm with a 470 ohm resistor (RD14CB2E471J).
2. Remove and delete C4 47pF
3. Add a 22pF 16v electrolytic (CE04WlC220M) on the foil side of the
board between D24, R23 (positive) and ground (negative).
Notes: 1. This change applies to units before serial number 209xxxx.
2. Installation time for this procedure is 1/2 hour or less.