problem with Kenwood TS-50

Discussion in 'Radio Circuits, Repair & Performance' started by SP3ELD, Jul 31, 2020.

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  1. SP3ELD

    SP3ELD Ham Member QRZ Page

    Maybe someone can help me?

    I am a Polish amateur radio. I have a Kenwood TS-50 transceiver since the beginning of the 1990s. I never had any problems with him!

    In recent days, however, a strange phenomenon has appeared: from time
    to time all the frequency digits on the LCD display go out, but all the decimal points appear. This phenomenon is preceded by a telegraphic message with the text "UL".

    After some time the problem passes...

    Maybe some of you know this problem and can help me somehow, for example by suggesting where to look for the fault?

    Thanks in advance for any help!

    Chris, SP3ELD
  2. KA5IPF

    KA5IPF Ham Member QRZ Page

    The dots and "UL" indicate that a PLL has unlocked. By it coming and going I would go the the PLL unit and replace the leaking SM electrolytic caps. Replace all and clean the board with good alcohol. Using a magnifier check all traces for damage.
  3. 4E9VVN

    4E9VVN Ham Member QRZ Page

    try to check the soldered pin at the PCB sometime the pin goes corrosion i had experience it but it is recomended if you know how to open your RIG.if not better to go a qualified technical guy....

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