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Hello,
So I received a peavey xr600b that had belonged to my grandpa from my uncle. He told me it didn't work. And it just blows fuse's. After getting it and opening it up I found two burnt up resistors and a burned up zener diode. After replacing these and reading several forms, I pulled the power transitor and checked all of them. Which checked out. I also checked the voltage coming from the transformer which was Red 39 volts on each side and 20 on each side of the orange wires. While I was putting everything back together I noticed that ( I marked and numbered all of the connections when I was taking it apart) the black and white wire plug was plugged into a three male plug connector. In the center of the board was a two male plug connector. Which seemed like that's where that black and white wire plug should go. But that is not where it was when I unplugged It. So I hook everything back up and turn it on. The compression light came on but not the power light. Then one of the resistors I replaced started to smoke and pop went the fuse. So replaced resistor moved plug to two prong connection flip the switch and, came on. fuse didn't blow and resistor didn't burn. Compression light comes on for a sec when turned on then fades out. Still no power light. There is a half volt of DC on output jacks and no AC. Test speakers plugged in it makes a metallic swooshing sound. When you turn it off the speakers make a high-pitched squeal sound. Back to the board after doing some more reading I start checking all the transistors I went ahead and changed the 5331's and 5332. I also decided to recap it due to testing results of the original caps. 8 of the 12 had failed. So after all of that when turned on it no longer makes noise while on but still makes the high pitch squeal and doesn't work. So hopefully someone can give me some ideas. It has the 400b/g board on it. And if you need numbers or have questions about anything else I have checked or done please ask away. Thanks for any help.
So I received a peavey xr600b that had belonged to my grandpa from my uncle. He told me it didn't work. And it just blows fuse's. After getting it and opening it up I found two burnt up resistors and a burned up zener diode. After replacing these and reading several forms, I pulled the power transitor and checked all of them. Which checked out. I also checked the voltage coming from the transformer which was Red 39 volts on each side and 20 on each side of the orange wires. While I was putting everything back together I noticed that ( I marked and numbered all of the connections when I was taking it apart) the black and white wire plug was plugged into a three male plug connector. In the center of the board was a two male plug connector. Which seemed like that's where that black and white wire plug should go. But that is not where it was when I unplugged It. So I hook everything back up and turn it on. The compression light came on but not the power light. Then one of the resistors I replaced started to smoke and pop went the fuse. So replaced resistor moved plug to two prong connection flip the switch and, came on. fuse didn't blow and resistor didn't burn. Compression light comes on for a sec when turned on then fades out. Still no power light. There is a half volt of DC on output jacks and no AC. Test speakers plugged in it makes a metallic swooshing sound. When you turn it off the speakers make a high-pitched squeal sound. Back to the board after doing some more reading I start checking all the transistors I went ahead and changed the 5331's and 5332. I also decided to recap it due to testing results of the original caps. 8 of the 12 had failed. So after all of that when turned on it no longer makes noise while on but still makes the high pitch squeal and doesn't work. So hopefully someone can give me some ideas. It has the 400b/g board on it. And if you need numbers or have questions about anything else I have checked or done please ask away. Thanks for any help.
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