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World of Ham Radio 1997
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1997-02-01
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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 # 949
MODEL: TS-440S
SUBJECT: PROTECTING Q33
If pin 7 (RL) of the remote connector is accidently
connected to ground, current from the 14 volt line (14L)
will damage transistor Q33 on the IF unit. This will prevent
the radio from transmitting. To protect Q33, a 4.7 ohm
resistor should be installed in series with the RL line on
the foil side of the IF board. In the event that pin 7 is
connected to ground, the resistor will open, but the
transceiver will still be capable of transmitting.
REQUIRED PART:
4.7 OHM, 1/6 WATT RESISTOR ........ RD14CB2C4R7J
1. Disconnect the power supply and antenna from the
transceiver.
2. Using a #2 Phillips screw driver, remove the 9 screws
from the top cover of the transceiver. Remove the cover
and unplug the speaker wire.
3. Locate connector 19 on the IF unit.
4. Using a #1 Phillips screw driver, remove the 7 screws
that secure the IF unit to the chassis of the
transceiver.
5. Pull the board up and rotate it towards the front of the
transceiver to expose the foil side of the board.
6. On the foil side of the board, locate the trace that is
connected to pin 3 (brown wire) of connector 19.
7. Using a craft knife, cut the trace comming from pin
three so as to open the foil trace.
8. Solder the 4.7 ohm resistor across the now open trace
(i.e. in series with the trace).
9. Assemble the transceiver by reversing steps 1 - 5.
Time required for this modification is 0.5 hrs or less.