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Kenwood TS-820 Manual
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Kenwood TS-820 Manual

Kenwood TS-820 Manual

Modifications
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TS-820 Fix the problem with the display
Here is somthing you can do if your digital display on the kenwood ts-820 is giving you
a problem..............
1. Remove the counter assembly unit from the 820.
2. Remove both circuit boards from the counter assembly ( upper and lower boards
).
3. Scrape away the varnish from the corners of the boards where the
interconnecting screwes and spacers hold the boards into the case.
4. Reassemble the counter....
That should take care of the problem..
New Display Tube for DG-1
The original display tube (LD-8109) used in the DG-1 digital display for the TS-820
and TS-820S has been discontinued by the manufacturer. However, there is a
replacement tube available. This tube is the LD-8135. It is not a direct replacement for
the original tube. The leads come out of both ends of the display tube instead of just one
as in the LD-8109. Therefore, it will be necessary to replace the complete display unit if
the display tube fails. The part number of the new display unit is X54-1310-00.
Please use this part number when ordering a replacement display unit. The new display
unit is being installed in the current production of the TS-820S and DG-1.
The new display unit (X54-1310-00) is a little more involved to install than the old one.
The installation is as follows:
1. Remove the top cover of the TS-820 (or TS-820S) and set the unit on the bench
so the front panel is facing you.
2. Remove the two screws from the original display unit (save them), unplug the
display unit forom the counter assembly and remove the display unit from the
transceiver.
3. Run the connector of the new display unit through the left bracket (from the
center).
4. Gently (but firmly) push the right side of the display unit throught the right
bracket. ( This is the most difficult part).
5. Gently push the left side of the display through the left bracket.
6. Install the screws from the old display in the mounting bracket of the new
display unit and plug the connector into the counter assembly.
7. Turn on the TS-820 (or TS-820S) and make sure the display tube works
properly.
8. Replace the top cover of the transceiver.
TS-520, TS-820 CW filter select control
Modifications for the Kenwood TS-820
1

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Summary of Contents for Kenwood TS-820

  • Page 1 Modifications for the Kenwood TS-820 TS-820 Fix the problem with the display Here is somthing you can do if your digital display on the kenwood ts-820 is giving you a problem....1. Remove the counter assembly unit from the 820.

  • Page 2: Installation

    Service bulletin no. 11 13-1-1977 The following information is for the installation and alignment of the AUX band inthe TS-820. This extra band will be for receive only. Reference will be made to schematics and board layouts as shown in the Service Manual.
  • Page 3 AC transformer to demagnetize it. TA7201P Substitution Parts Kit The Toshiba TA7201P audio amplifier (Q3) used in the TS-820(S) and R-820 is no longer available. The part has been replaced with a kit (Part # W05-0257-00). This...
  • Page 4 Should it be found that the audio is too low, the value of resistor R4 on the AF AVR board can be reduced from 220 ohms to 82 ohms. The resistor removed from the R40 position can be used in this situation. TS-820 Speech Processor Alignment Author: Trio-Kenwood Communication, inc.
  • Page 5 VR-7 should be adjusted for the particular microphone the customer will be using with his TS-820. 6. Finally check for non distortion of signal, and that comp level of 20db can be obtained at full comp on.
  • Page 6 5. If digital display does not count: Make sure DH is not"ON." 6. If there is no DG display: Make sure you are not inREMOTE VFO with no remote VFO attached. 7. When intermittant in any circuit: a. Check for loose black jumper from point to pointon circuit board. b.
  • Page 7 31. No TX or RX: Loose contact VFO output terminal on Fix Vox unit. TS-820 RIT modification Author: Trio-Kenwood Communication, inc. Service bulletin no. 13 (27-1-1977) We have had a few reports of the TS-820 RIT tuning being "rubbery". The following information will solve this. How to modify:...
  • Page 8 4. Install a capacitor (3.3uF - 10uF) between RIT control and ground. See figure 2. 5. Adjust VR-2 on AF-AVR unit (X49-1080-00) for the same frequency as the center position of the RIT control. Microphone input attenuator for TS-820 Author: Trio-Kenwood Communication, inc.
  • Page 9 Trio-Kenwood Communication, inc. Service bulletin no. 30 (14-3-1978) The purpose of this bulletin is to give a simplified alignment procedure for the TS-820 and TS-820S transceivers. We have tried to combine some of the step and rearranged the sequence of step so the alignment may be done quicker. This may be used in lieu of the alignment procedure in the Service Manual.
  • Page 10 Band Coil Frequency WWV T1 24.08 MHz T2 10.88 MHz T3 12.88 MHz T4 16.08 MHz T5 23.08 MHz T6 30.08 MHz T7 37.08 MHz 28.5 T8 37.58 MHz T9 28.08 MHz 29.5 T10 28.58 MHz Received signal AUX T11 + 0.03 MHz 4.
  • Page 11 b. In the CW mode connect a frequency counter to TP5 on the IF unit (X48-1150-00) and adjust TC1 on the CAR-2 Unit (X50-1320-00) for 8.830.7 MHz. c. Adjust VR1 o the CAR-1 Unit (X50-1310-00) for equal output freq. on USB and LSB.