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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb0935.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 # 935
MODEL: TM-321A
SUBJECT: LOSS OF TX AUDIO WITH MC-48B
When an MC-48B is used with the TM-321A, transmit audio may be suppressed
due to RF feedback. This occurrence is restricted to mobile operation
where the antenna is in close proximity to the microphone.
The audio can be restored by adding a 100pF capacitor directly to the mic
element terminals.
REQUIRED PARTS:
100pF, 50V CAPACITOR KENWOOD PART NUMBERS CK45BlHlOlK OR CC45BlH101K
1. Remove the 3 screws from the mic case (Figure 1).
Carefully open the case.
2. Pull the PC board, PTT knob, and PTT micro switch out of the mic case
to expose the mic element cover (Figure 2).
3. Remove the 3 screws and mounting clips (Figure 3) securing the element
cover. Remove the PTT spring. Pull the mic element and cover out of
the case.
4. Remove the element from the rubber cover.
5. Install and solder the capacitor directly to the mic element terminals
where the brown and white wires are connected (Figure 4).
To avoid damaging the element, use a low wattage soldering iron.
6. Carefully assemble the mic by reversing steps 1 - 4.