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Tech Head - The Technology Section
The Work Bench and Soldering Station
Faulty 0/12v output?
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<blockquote data-quote="Llew" data-source="post: 282571" data-attributes="member: 175007"><p>The switching transistor is the surface mount one slightly to the right of the socket - marked as Q13 (or may be Q19 - there's a solder-through blob right on the number in mine).</p><p></p><p>The three legs come out as - top leg = collector. Should have 12V when switched.</p><p></p><p>You want the bottom left leg = base, this is the switching line. This should be 12V <em>when you switch to 0V.</em></p><p></p><p>Switching to 12V, this line goes to ~11.3v, switching the transistor on, giving 12V to the socket.</p><p></p><p>The bottom right leg = emitter, and is pegged at 12V with the switching in either state.</p><p></p><p>I would definitely suspect this transistor, but could be some other cause.</p><p></p><p>Not much room for mistakes when taking measurements, don't short out the legs!</p><p></p><p>Llew</p></blockquote><p></p>
[QUOTE="Llew, post: 282571, member: 175007"] The switching transistor is the surface mount one slightly to the right of the socket - marked as Q13 (or may be Q19 - there's a solder-through blob right on the number in mine). The three legs come out as - top leg = collector. Should have 12V when switched. You want the bottom left leg = base, this is the switching line. This should be 12V [I]when you switch to 0V.[/I] Switching to 12V, this line goes to ~11.3v, switching the transistor on, giving 12V to the socket. The bottom right leg = emitter, and is pegged at 12V with the switching in either state. I would definitely suspect this transistor, but could be some other cause. Not much room for mistakes when taking measurements, don't short out the legs! Llew [/QUOTE]
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The Work Bench and Soldering Station
Faulty 0/12v output?
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