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CTC 203

Discussion in 'Electronic Repair' started by Michele Smith, May 24, 2005.

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  1. I've discovered the horizontal driver Transistor is shorted Emitter to Base,
    and have been endeavoring to find the cause of this short. Any help would be
    appreciated. Thanks. Mark.
  2. Guest

    Is it shorted Collector to Emitter? Then it is bad.
    If you read around 40 ohms base to emitter, it is good. Look up the
    datasheet for any horizontal output transistor and look at the internal
    B-E resistor.

    Might want to brush up on electronics and consumer electronics repair,
    i.e. TV sets.
  3. sofie

    sofie Guest

    Michele Smith:
    Make certain that you test the transistor "out of circuit" to obtain
    conclusive results.
    The HDrive transistor is usually a "standard" NPN TO-92 silicon so the
    testing is usually straight forward, whereas the HOT usually has an internal
    resistor and damper diode which will complicate the test results and cause
    confusion unless you know what to look for in your meter readings.
    Shorted transistors can be the result of faults in the surrounding
    circuitry.... or.... it could have just been the time for the transistor to
    fail without any other related circuitry failures. Old fashioned
    troubleshooting, testing and experience will speed the diagnostic process.
    You might want to go to the website for this newsgroup at
    There you will find a wealth of technical helps.
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