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
http://www.repairfaq.org/
There you will find a wealth of technical helps.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
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"Michele Smith" wrote in message
.. .
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.