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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 # 807
MODEL: TR-2400
SUBJECT: OPTIONAL CHARGE INPUT PROTECTION
                                                        
 Some users may request addition of a series diode to the Charge Jack to
 prevent inadvertent shorting of the battery pack if a voltmeter probe,
 headphone jack, or other conductor accidentally shorts across the external
 Charge Jack. This can be used only for the standard wall charger. The
 optional fast chargers require battery voltage be available at the charge
 jack as feedback to the charqer requlator.
 
 Add a Si diode in series with the battery charge line, at the Charge Jack.
 Observe battery polarity. Charging current will drop approximately 2 ma.

      1. Si diode must be rated at least 200mA.
      
      2. Install carefully-don't short the YELLOW B+ lead when reassembling.