Transistors, Resistors, Diodes

every good boy deserves fudge??? isn't that like the notes of a treble or bass clef??? haha

here are your colors

http://www.the12volt.com/resistors/resistors.asp

 

go for it.you cant hurt them more anyways.lol

 

Your pic isnt showing up!!!


Generally speaking, if you have blown transistors, you will also have other things that are toast too, but not visibly. You may get lucky and change out the blown parts and it will work fine, but i doubt it. Transistors can blow for many reasons, such as overcurrent, over voltage, shorted out, etc.....

I have repaired a few amps over the years, but that was with the help of a tech from Orion ( I used to know "people" ) I learned a bit from him. Unless you have the right test equipment, you are shootin in the dark buddy!

But hey, go for it!!!!!! Good Luck!!!!

 

Check for cold solder joints. Transistors (semi conductors) dont intermit. They work or they dont. No inbetween. Cold solder joints are easy to spot, looks like a ring around the soldered connection.

I did not see it in the link you provided, but transistors must be tested out of circuit. Transistors will always test bad in circuit because they have bias resistors and other components attached to them.

Now is the problem in the power supply or the outputs. Set your volt meter to a 200-volt scale, power up the amp, and test the center pin on the output transistors. Let me know what the voltages are and I can tell you where to go from there.

 

Post pics of the damge to the amp on the CB

 

does your camera have a macro button.?if it does it will focus better up close

 

power supply is dead

 

no no the macro is a setting.not like turning the screen on.it looks like a little flower.is usually near the flash setting.

 

He is right and those are not "exactly" transistors. They are MOSFETs (Metal Oxide Semiconductor Field Effect Transistor). They dont test the same as a typical transistor. Anyway if one is bad you can assume the rest are also.

While MOSFETS can handle extreme amounts of current and voltages and heat, they do not handle shorts very well.

One of two things happened, the output tansistors shorted or one or two of the bias resistors shorted taking out the MOSFETS. Make that three things, the Bridge Rectifiers could have shorted, that will take out a MOSFET Quick. They look like transistors except insted of part #'s they have diode symbols on them. They will be located between the MOSFETS and the output Transistors.

If you decide to fix it, replace all the MOSFETS. Check all resistors and make sure none are open or shorted. All the power supply caps are OK. Any way the amp is dead so take advantage of it, its now a learning experience

 

Location of the Bridge Rectifiers, this should be right. There will be another pair on the other side.