==============================================================================
                             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 # 836
MODEL: TR-7800
SUBJECT: OPTIONAL CONTINUAL CHARGE FOR INTERNALBATTERIES
                                                             
     The internal batteries for memory back-up charge only when the
     radio is on. If the radio is used less than 2 hours a day, the
     internal batteries may not charge sufficiently to retain memory
     if the main power is disconnected. This optional change may be
     made to continuously charge the internal batteries from the main
     power source, whether the radio is on or off.
     
     1. On the RX unit X55-1270-l0, change R94 from 56 OHMS to 120 OHMS,
        l/2W.
        
     2. Cut the foil at the input to Q27 and connect via a 3/4" lead
        to the BB terminal on connector l.
        
     3. Battery charge current will be 15ma nominal.
     
     NOTES:
     
     l. The radio should be connected directly to the vehicle battery
        and not through the ignition switch.
        
     2. Turn the radio off before connecting or disconnecting the
        power cable.
        
     FOR EARLY UNITS:
     
     3. Before closing the case, check clearance from the back of the
        battery case to the chassis. If very close, add suitable
        insulation between the battery case and chassis.
        
     4. Check for the presence of a 470K l/8W resistor which should
        be located on the bottom of the Control unit X53-1180-xx,
        Connector ll, UP pin. Add if not already installed (and see
        Service Bulletin #829).