x2turbo
Well-Known Member
A friend gave me a SA-8500 that is having issues and hoping for some advice.
It powers up and comes out of protection and actually sounds good for the first few seconds and then degrades into distortion and the sound level fades.
I tried following the procedures in the service manual to set the junction point and idle current but it's not working very well.
I turned VR1 and VR2 clockwise to 0 but turning the VR3 or VR4 has no real effect. Starts out at -175mv and can get it to move to -165mv with a full spin of the pot.
By adjusting both VR1 and VR3 I was able to eventually get the values where they should be but it didn't have any positive effect on the sound.
I'd like to get it working again without taking a shotgun approach as that hasn't always fared well for me in the past. Live and learn.
Thanks
It powers up and comes out of protection and actually sounds good for the first few seconds and then degrades into distortion and the sound level fades.
I tried following the procedures in the service manual to set the junction point and idle current but it's not working very well.
I turned VR1 and VR2 clockwise to 0 but turning the VR3 or VR4 has no real effect. Starts out at -175mv and can get it to move to -165mv with a full spin of the pot.
By adjusting both VR1 and VR3 I was able to eventually get the values where they should be but it didn't have any positive effect on the sound.
I'd like to get it working again without taking a shotgun approach as that hasn't always fared well for me in the past. Live and learn.
Thanks