Author Topic: Knocker Coil Locked On  (Read 2222 times)

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Offline Slash

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Re: Knocker Coil Locked On
« on: September 06, 2015, 04:25:40 PM »
Those readings seem ok but checking transistors with a multimeter sometimes doesn't tell the whole story.
I've seen transistors many times where they check ok on a meter but are still bad, ie they break down under operating conditions in circuit. Diodes can also fail in this way.

Another test is to check across the collector and emitter with the meter set on ohms, you should get infinity reading.

 

I put red on the collector and black on emitter and got infinity.  When I switched it around I got 28.4 (I was on the 200K Ohms setting).  Should that reverse setting actually read 0.00 if it was ok?