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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb0962.txt
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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 # 962
MODEL: TS-950S/SD
SUBJECT: Early Protection With TL-922
The TS-950SD RX to TX switching time in semi break-in is approximately
10mS. At key down, the transceiver momentarily sees an open circuit
because the linear's keying relay has not engaged. As a result, the
transceiver's protection circuit turns on, causing the output power to
be reduced. The following modification will make the RX to TX switching
time, in semi-break-in, approximately 30mS. This modification does not
affect full break-in switching. Increasing the switching time to 30mS
may restrict certain long distance high speed communications.
REQUIRED PARTS:
DIGITAL TRANSISTOR (QTY 2) PART # DTC124ES
100K OHM, 1/4W RESISTOR PART # RD14BB2E104J
2.2uF, 50V ELECTROLYTIC CAPACITOR PART # CE04EW1H2R2M
1. Disconnect the power cord and antenna.
2. Remove the top and bottom covers (18 screws).
3. Remove the top screw from each side of the front panel assembly.
4. Loosen the bottom screw on each side of the front panel assembly.
5. Pull the front panel assembly forward to expose the Digital and
Control boards.
6. Remove the two screws that secure Control board B/3 to the top of
the chassis and swing the board out of the way.
7. Remove the 4 screws from Control board A/3 and rotate the board down.
Disconnect the right hand plugs as necessary to expose the foil side
of the Control board.
8. Install the circuit shown in figure 1 on the foil side of Control
Board A/3.
9. Assemble the transceiver by reversing steps 1 - 7.
+
/--- 2.2UF -----> TO PIN2 IC-10
b c/
/--!-|
b c/ | e\
CN8-3 <----| | |
e\ | GND
\ |
| |----------100K-------->TO CN8-7 (15V)
GND
This modification is covered under the 1 year warranty.
Time required to perform this modification is 1hr. or less.