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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   <<<
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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 # 873
MODEL: TS-930S
SUBJECT: CW VBT

This procedure will allow a simplified alignment method for the TS-930S 
CW VBT section, when a VBT-l jig is not available.

TEST EQUIPMENT REQUIRED
Oscilloscope
Audio signal generator (2)
AF VTVM

PROCEDURE

l. Preset the TS-930S controls as follows:

	l) MODE: 	LSB

2) Disconnect the DRV connector from the Signal Unit.
3) Confirm that CAR2 frequency is the same when switched
   from transmit to receive. If it does not stay constant
   adjust VR23.
2. Connect the oscilloscope probe to Rl76 in the Signal Unit.
3. Connect two Audio Generators to the mic input through 4.7k resistors
   and a 560 across the mic input. Set one frequency to 300 Hz and set the
   other frequebcy at 2.9 KHz

4. Ensure that the output level of AGl and AG2 are equal by using the AF VTVM.

5. Connect the cathode of Dl33 to that of Dl32 in the Signal Unit using 
   a 0.0lpF capacitor.

6. Clip the lead of D124 and place the STBY switch to SEND.

7. Adjust TC4 (CAR1 8.8315 MHz for USB) so that a complete tone waveform 
   is observed, and adjust so that the minimums just touch. Return to 
   REC, and resolder D124.

8. Remove the O.O1pF capacitor installed in step 5.

9. Set STBY to SEND and adjust TC3 (CAR2 8.375MHz ) so that a complete 
   two tone signal is displayed.

10. Return to REC, and reconnect the DRV connector. 

This completes the simplified alignment procedure.