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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb0836.txt
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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 # 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).