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BINGO! Fixed: insufficient vertical height. F321221WNNO1 (CTC169 chassis)

Discussion in 'Electronic Repair' started by Jason D., Feb 2, 2004.

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  1. Jason D.

    Jason D. Guest

    That is TOUGH DOG. Set sat for weeks, I've been at it on and off.

    CR4501 tests ok on diode test but fails on ohm check, leaks like 26K
    ohm both ways. Scope did not catch that, except voltages with dmm on
    pin 2 and 3 of this LM113 were low.

    That diode is jellybean 1N4148.

    Cheers,

    Wizard
     
  2. RonKZ650

    RonKZ650 Guest

    CTC169 with vertical troubles is always a "tough dog". The only reliable way to
    check this diode would be to check the DC voltage on both ends of it. If you're
    dropping more than the normal 0.6v of a good diode, the diode is open, and yes,
    they will always check good on a diode checker.
    Ron
     
  3. JURB6006

    JURB6006 Guest

    Heck, that ain't shit, how about "no color" intermittently, 164589 130V
    rectifier, super high speed. Tried one ECG580 and it lasted 10 seconds. Had at
    least ½ dozen of those when the chassis was newer. Later the 15V rectifiers
    started going.

    Being a ½ way smart muthaf......nevermind, I've reasoned that these diodes must
    be built in two cells, a high speed section with lower specs and a higher
    current section that takes over after the beginning of the conducted pulse.

    This is the only way I can see for a diode to lose it's high speed switching
    characteristic and yet be able to function and test normally at lower
    frequencies.

    Any otrher ideas ? Anybody care ?

    Is there an official explanation ?

    JURB
     
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