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                             K E N W O O D
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                        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

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BULLETIN # 1061
MODEL: TM-733A
SUBJECT: PL Tone Bleed Through 

Symptom: When transmitting a PL tone a "humming noise" might be heard 
coming from the internal speaker of the TM-733A. This is caused by a 
difference of potential between the tone generating circuit and the AF 
amplifier circuit.

Countermeasure: This symptom is corrected by tying the ground connections 
in the AF amplifier and Tone generating circuits together.

Parts Required:

Qty	Description	Old Kenwood Part No.	New Kenwood Part No.
		
2	Screw           N87-2606-46             N87-2608-46
2	Star washers    N/A                     N16-0026-46
1	Small gauge hookup wire

Procedure:

1. Disconnect the power cable, microphone and antenna's, etc.
2. Detach the front panel and set it aside.
3. Remove the top and bottom covers.
4. Remove the speaker and speaker mounting bracket
5. Disengage the plastic front panel from the main chassis.
6. Remove the two Phillips head screws that secure the TX/RX unit to the 
   chassis.
7. Install the new screws and star washers.
8. Solder a jumper wire from the ground side of C424 (the one nearest IC405)
   on the Control Unit to pin number 8 of IC7 (next to battery) on the 144 
   Mhz TX-RX Unit.
9. Reverse steps 1 - 5 for reassembly.


Caution: This modification requires advanced surface mount soldering 
equipment that is rated for CMOS circuits. It also requires familiarity 
with advanced surface mount soldering techniques. If you do not have the 
proper equipment or knowledge do not attempt this modification yourself. 
Seek qualified assistance from your closest Kenwood Service Center 
(Long Beach, CA, or Virginia Beach, VA).

Time required for this modification is 30 minutes or less.
Service code A:09 B:X57-4360 C:ADDW D:91