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What is The value of resistance no 512?

After replaced The H out transistor the resistance no.512 burnt l need The value of The resitance

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Posted on Dec 09, 2014

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SOURCE: power supply transistor transistor no. C4237 replaced 4 times. each replacement didnot sustain for a week. which transistor can i use instead.

put transistor c3998.it will get o.k.

Posted on Jun 09, 2013

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The treadmill have dcmd67 control board I need to know what value resistor R 19 have


I can't help you (directly) with the resistor value, but be aware that if it exploded, there is probably another bad component (such as a capacitor, transistor, and/or an SCR). Replacing only the resistor may result in the same problem, or may not even work at all due to another bad component. If you do find out the value, try putting in a resistor of the same value, but with a higher wattage rating. I once had a washing machine in which the model had a known problem with circuit boards blowing. I solved it by replacing a bad transistor and installing a higher wattage resistor that had blown up like yours. It never failed again. The way I found the value of the blown resistor is, I looked up a replacement board online, then magnified the photo, and looked at the color code on that same resistor in the photo. How I found the bad transistor is too complicated to explain in few words, but you can google the procedure. (You'll need a multi-meter at the very least; preferably _with_ a built in transistor checker. However, a _totally_ blown transistor can be found with only the resistance settings on a regular multi-meter).

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Transistors don't really have values, just a number on them. Most Japanese transistors are numbered with a letter first, A, B, C, K, and then a number. When searching for a replacement you add the this at the start "2S" so 2SB500 for one marked B500. If you can't read a number due to damage, with stereo amps the two channels are the same. So if the left channel transistor has burnt up look at the right channel one, you will quickly see the parts around it will be arranged the same as the blown channel.

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You need the old transistor. Knowing it's brown is not enough; you need to know its resistance value. It sounds like the resistor you replaced with has too low a resistance value, causing the "cuts" in sound. Find the old resistor and then use this site to find out what you need:

http://www.dannyg.com/examples/res2/resistor.htm

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Its best to replace both IC's. As far as the resistors, there are location #'s marked on the board where the resistors are mounted. If any look burnt, get the location numbers off the board, and your model # and email me @ halselectronics@comcast.net. I will get you the resistor values.

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