blown two zx 700.5s and two deq 9200a

[Perry Babin]

You'd want to confirm that the meter reads OL base to emitter and base to collector with the probes placed one way and several megaohms with the probes reversed. It should read OL no matter the placement on the collector and emitter.

If you're still unsure about the test procedure, go to the following page. Find the section shown in the attached image, read what's circled and follow the instructions. In this instance, it would be better to set your meter to ohms instead of diode-check because the transistors may only be leaking.

Basic Amplifier Repair - Transistor Test Applet Link

 

[rolexcomm]

both of them are bad, they both have continuity between emitter collector and one doesn't show mega ohms like it should between emitter, base.

 

[Perry Babin]

OK, well let us know if there are any other problems after replacing them.

 

[rolexcomm]

will do, one last question. Do you think both of these are the same part numbers. the q315 has a hole burned in it on the top. Can only see it with a magnifying glass

 

[Perry Babin]

They should be the same.

 

[rolexcomm]

got both of them replaced and the amp was put to work yesterday at idle for about 5 hours and so far so good. Today will hook it up and try it out..

 

[rolexcomm]

Perry, Ran this amp all weekend in my car and everything is a ok..... Thank you again. You know ur stuff...