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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   <<<
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                        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

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BULLETIN # 997
MODEL: TH-78A
SUBJECT: Clone Failure w/ME-1 Installed

Background:

Some TH-78A owners have reported a failure of the cloning feature after 
the ME-1 Memory expansion unit is installed. The following modification 
will correct this problem.

Note:  Since the Cloning feature is not one that is mentioned in the operators
manual, and is basically an unsupported feature, we do not anticipate many
reports of this symptom.    

WARNING:  This radio uses micro-sized surface mount components, and/or
multi-layer circuit boards. If you are not familiar with the techniques for
service of this type of equipment do not attempt this modification yourself. 
You will invalidate your warranty if you attempt to modify the equipment and
damage the radio. If you are at all in doubt about your qualification to
perform this modification you should seek qualified assistance.
 
Required Parts:
IC-7 Microprocessor   HD404629A32H

Procedure:
1. Remove the battery, and antenna.
2. Remove the 3 small black #0 phillips head screws from the rear panel 
   of the transceiver and the 1 small black #0 phillips head screw from 
   the side of the transceiver near the antenna connector.
3. Carefully separate the front panel from the rear of the transceiver and 
   fold it over to allow access to the rear of the front panel.
4. Unsolder the brass shield from the circuit board (4 solder points).
5. Locate IC7 the largest of the two IC's under the shield, unsolder and
   remove.
6. Install the replacement part.  Make sure there are no solder bridges or 
   cold solder connections.
7. Reverse steps 1-4 to reassemble.
8. Press and hold the "M" key on the front panel, turn on the power, then
   release the "M" key to reset the microprocessor.



This modification may be covered under warranty. Time required for this
modification is 1 hr or less.