Hello. I have a 4300 that I got from a friend that said it was broke. He was right but this thing sounds sweet when it is working. It has a mind of its own. I had it on the bench and could not get a steady reading for bias or DC of set. It will come out of protection no problem. I pulled the driver boards checked things out and played around with it for a while.
Put the boards back in and checked DC again and it was stable! So I set it then set the bias. Both where stable and looked good.. Hooked up speakers and listened to FM... All was good. Took it it on the house and it worked for 15 mins then.. Audio faded out and a crackling poking sound came in. It sound's just like a record that has played past the music and you are listening to dirt and lint on the blank record at high volume. I checked the DC at speaker terminals and sure enough its up and down all over the place.. In all chanels.
While still not coming out of protection. Is the problem in the power supply? Any help would be great thanks.
Put the boards back in and checked DC again and it was stable! So I set it then set the bias. Both where stable and looked good.. Hooked up speakers and listened to FM... All was good. Took it it on the house and it worked for 15 mins then.. Audio faded out and a crackling poking sound came in. It sound's just like a record that has played past the music and you are listening to dirt and lint on the blank record at high volume. I checked the DC at speaker terminals and sure enough its up and down all over the place.. In all chanels.
While still not coming out of protection. Is the problem in the power supply? Any help would be great thanks.