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Thread: Repair Kenwood TS-820s

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  1. #1

    Default Repair Kenwood TS-820s

    For starters I goofed, I bought 2 TS-820s off of ebay,
    just got my Tech Lic and made up a dummy Load for testing.
    Both of them will not TX,I replaced both 100mfd/500dcv capacitors,
    RF driver tube on one of the rigs.I have a service manual & very limited knowledge.

    Using the dummy Load my DVM reads 0dcv.

    Q:In the transmitter section,there is a schematic from the mic to
    the ant. Would it make sense to start checking voltages via the
    chart? I'm thinking of going right to the finals and checking the plate
    voltage 920 (750) and working back towards the mic.
    Another Question: (750) means ?

    I have tested the power transformer,it's fine.

    Maybe I'm asking too many dumb questions! Thanks

  2. #2

    Default

    Quote Originally Posted by KD0KLH View Post
    For starters I goofed, I bought 2 TS-820s off of ebay,
    just got my Tech Lic and made up a dummy Load for testing.
    Both of them will not TX,I replaced both 100mfd/500dcv capacitors,
    RF driver tube on one of the rigs.I have a service manual & very limited knowledge.

    Using the dummy Load my DVM reads 0dcv.

    Q:In the transmitter section,there is a schematic from the mic to
    the ant. Would it make sense to start checking voltages via the
    chart? I'm thinking of going right to the finals and checking the plate
    voltage 920 (750) and working back towards the mic.
    Another Question: (750) means ?

    I have tested the power transformer,it's fine.

    Maybe I'm asking too many dumb questions! Thanks
    Two rules:

    1. Never buy a rig you can't try out personally.

    2. The number in parentheses (750) means the "key down" voltage on transmit, as opposed to the "first" number, which means the "standby" voltage (not key-down).

    The TS-820S is a very easy rig to work on.

    I know it inside-out.

    But I'd never buy one without trying it out first. It was designed 35 years ago.

  3. #3
    Join Date
    Feb 2006
    Location
    The Desert
    Posts
    530

    Default

    If, by your own admission, you are not familiar with trouble shooting, I would advise you stay away from the tube section. In fact, I would recommend you find someone who can elmer you in SAFE troubleshooting techniques. It takes a long time to become adept at successfully working on electronic equipment. Please, safety first!

  4. #4

    Default Repair Kenwood TS-820s

    Quote Originally Posted by WB2WIK View Post
    Two rules:

    1. Never buy a rig you can't try out personally.

    2. The number in parentheses (750) means the "key down" voltage on transmit, as opposed to the "first" number, which means the "standby" voltage (not key-down).

    The TS-820S is a very easy rig to work on.

    I know it inside-out.

    But I'd never buy one without trying it out first. It was designed 35 years ago.
    If I decide to farm it out for repairs,one has SSB filter & CW filter
    Can I swap them over to the other rig? The one I want to have repaired
    does not have them.

  5. #5

    Default

    Quote Originally Posted by KD0KLH View Post
    If I decide to farm it out for repairs,one has SSB filter & CW filter
    Can I swap them over to the other rig? The one I want to have repaired
    does not have them.
    I don't understand the question.

    The rig won't work without the SSB filter...

  6. #6

    Default Repair Kenwood TS-820s

    Quote Originally Posted by WB2WIK View Post
    I don't understand the question.

    The rig won't work without the SSB filter...
    I wanted to swap the IF board,got the answer "yes" from another ham.
    I have 2 TS-820s and wanted to keep the best looking one.

  7. #7
    Join Date
    Aug 2008
    Location
    SanDiego, People's Republic of California FEMA District 9
    Posts
    41,517

    Default

    Quote Originally Posted by KD0KLH View Post
    For starters I goofed, I bought 2 TS-820s off of ebay,
    just got my Tech Lic and made up a dummy Load for testing.
    Both of them will not TX,I replaced both 100mfd/500dcv capacitors,
    RF driver tube on one of the rigs.I have a service manual & very limited knowledge.

    Using the dummy Load my DVM reads 0dcv.

    Q:In the transmitter section,there is a schematic from the mic to
    the ant. Would it make sense to start checking voltages via the
    chart? I'm thinking of going right to the finals and checking the plate
    voltage 920 (750) and working back towards the mic.
    Another Question: (750) means ?

    I have tested the power transformer,it's fine.

    Maybe I'm asking too many dumb questions! Thanks
    Chalk it up to a learning experience.
    We all started somewhere.
    The important thing is you were attempting to do something you haven't done before and what you learn in the process is valuable.

    New experiences are always a good thing.
    When it's time, it's time, and it maybe sooner than you think.

  8. #8

    Default Repair Kenwood TS-820s

    [QUOTE=KD0KLH;1879944] For starters I goofed, I bought 2 TS-820s off of ebay,
    just got my Tech Lic and made up a dummy Load for testing.
    Both of them will not TX,I replaced both 100mfd/500dcv capacitors,
    RF driver tube on one of the rigs.I have a service manual & very limited knowledge.

    Using the dummy Load my DVM reads 0dc


    The good news I got both Transceivers to transmit,
    I replaced 12BY7A in both and pulled out the comp level
    knob. The bad news is:I checked the last one with a
    dummy Load 31 volts=10 watts about 1/10 of what the
    TS-820s is designed for!! Question: any ideas? Thanks

  9. #9

    Default

    [QUOTE=KD0KLH;1881112]
    Quote Originally Posted by KD0KLH View Post
    For starters I goofed, I bought 2 TS-820s off of ebay,
    just got my Tech Lic and made up a dummy Load for testing.
    Both of them will not TX,I replaced both 100mfd/500dcv capacitors,
    RF driver tube on one of the rigs.I have a service manual & very limited knowledge.

    Using the dummy Load my DVM reads 0dc


    The good news I got both Transceivers to transmit,
    I replaced 12BY7A in both and pulled out the comp level
    knob. The bad news is:I checked the last one with a
    dummy Load 31 volts=10 watts about 1/10 of what the
    TS-820s is designed for!! Question: any ideas? Thanks
    RF isn't DC. DVMs don't work at HF. What are you using to measure the voltage?

  10. #10

    Default Repair Kenwood TS-820s

    RF isn't DC. DVMs don't work at HF. What are you using to measure the voltage?[/QUOTE]


    My DVM taken at post of my home made dummy load
    see www.K4eaa.com
    Last edited by KD0KLH; 03-09-2010 at 03:05 AM.

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