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World of Ham Radio 1997
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asb0921.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 # 921
MODEL: TS-940S
SUBJECT: SSB Talk Power Improvement
TS-940S's in the serial number range of 601XXXX through 708XXXX may be
limited n SSB peak power as compared to full CW output. The level may be
increased by changing the value of capacitors C182 and C183 in the ALC
circuit on the Control board. The recommended replacement value for each
capacitor is 0.0022 uF, 50v (CK45B1H222K).
Procedure:
1. Disconnect the power cord and antenna from the transceiver.
2. Remove the top and bottom covers (16 screws).
3. Locate the Control board on the bottom of the transceiver.
4. Locate transistor Q37 on the board (toward the back right hand side.)
The two capacitors are mounted on the foil side of the board underneath
Q37.
5. To access the bottom of the board remove the 8 screws that mount the
board and heat sink to the chassis (See figure 1.)
6. Carefully lift the board/heat sink fomr the right hand side and pivot
it toward the front of the transceiver.
7. Replace C182 and C183 with 0.0022 uf, 50v capacitors.
8. Lower the board back into its original position (don't pinch any
wires!) and re-install the 8 mounting screws.
9. Put the covers back on the TS-940S and secure them with the 16 case
screws.
10. Connect the antenna and power cord then test the transceiver for
normal operation.
Time required for this change is 1 hour or less.