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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 # 904
MODEL: TM-2550A
SUBJECT: DCL Call Sign Data
Some owners of the TM-2530/50/70 have reported a loss of the DCL system
call sign data when the power switch is turned off. The call sign data
actually remains in memory, but timing prevents its utilization in some
radios. Adding a resistor will correct this problem.
If you receive a radio that exhibits this symptom add a 47K ohm resistor to
IC3 to the Slave CPU on the control unit (X53-1440-XX) between pins 4 and
20. Cover the resistor leads with "spaghetti" type insulation. Adding the
resistor to radios that do not have this symptom will not cause any
problems, so you may wish to add the resistor if you receive a radio for
service for some other problem.
Before soldering unplug the DC power cable and antenna from the radio.
When soldering to this IC you must use a soldering iron that provides
voltage isolation on the tip since IC3 is a CMOS device and can be easily
damaged by static electricity or voltage on your iron. Use normal CMOS
precautions. One final precaution: Don't bridge any of the pins on the IC
with excess solder!
Time required for this modification is 1/2 hour or less.