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Ft 817 no output power

Discussion in 'General Technical Questions and Answers' started by G0ILN, May 2, 2012.

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  1. G0ILN

    G0ILN Ham Member QRZ Page

    I have just come back to Radio after a break of 10 years. My old Ft 817 in CW mode does not seem to put out any power. My SWR meter does not show any power and the Power meter on the radio the bar graph does not light up! The red TX light does come on.
    There are four power levels L1 L2 L3 and H (or H may be represented by L3 Flashing.) L3 shows on the LCD but never flashes and H never puts in an appearance.
    What am I doing wrong?
    Richard G0ILN.
  2. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    You are closing the key, right?
  3. WR1O

    WR1O Ham Member QRZ Page

    Does it output power in FM or AM? If this is all band/mode problem could be a bad PA. The older 817's are notorious for that. Good news is the new replacement board has been updated and no longer self destructs and costs less than $50 USD and is user serviceable by anyone with moderate skills.
  4. KF5FEI

    KF5FEI Ham Member QRZ Page

    Yep. Apparently if you left batteries in the 817 and they got low, the finals would self-oscillate and self-destruct. Replacement is supposed to be pretty straightforward -- you need a good regulated power supply and a DVM. The service manual is available online in a number of places.
  5. G0ILN

    G0ILN Ham Member QRZ Page

    Hi all,
    thanks for your help since reading your replys I have Googled the blown finals and my problem is classic! Amateurs have even (tongue in Cheek) started a club the fault is so wide spread. I have downloaded a repair sheet by Mike Perry PA7XG which is a simple guide to replacing the board.
    I have a QRO set so I am not off the air.
    Thanks again.

    Richard. G0ILN.
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