K-Schick
New Member
Ok, will do!
I *should* have a bunch of free time tonight after work to really roll up my sleeves and dig into this.
Question:
When I'm doing Bias Adjustments and exercising the VR1 & VR2 Trimpots, is there a threshold or limit that I should watch out for, as to not damage the receiver?
I stumbled across this thread:
http://audiokarma.org/forums/index.php?threads/sx-750-left-channel-distortion.147992/
On page 2, MarkTheFixer mentions to "NEVER" go above 45mV when adjusting Bias. I am positive that I momentarily went well above this (probably into the 70 or 80mV range) when first messing with these VR's. It was momentary, and nothing seemed to happen. (Fingers crossed everything is ok).
I dont want to be overly paranoid here, and I know that the SM calls for Biasing at 50mV for the first 20 mins, but should I always be adjusting the Bias first (to, say, 50mV), then turning those VR's downward when checking these Transistors? I was thinking that if Im starting with the VR's all the way down, then Im blindly turning VRs up/down while testing, I may be going well above the 50mV threshold, and causing further problems.
I just bought a mid-range DMM to replace my old one, so I suppose I could hook up two at once:
One for keeping an eye on the Bias, and one for checking those Transistors, but that seems like double the work, and a lot to keep my eye on at once. Is there a specific workflow for doing this safely with one DMM?
What do you think? Should I be more careful and adjust Bias first, then turn VRs down to see what ranges Im getting on Transistors?
Or is it safe to continue doing what Im doing because Im using a DBT?
Thanks!
I *should* have a bunch of free time tonight after work to really roll up my sleeves and dig into this.
Question:
When I'm doing Bias Adjustments and exercising the VR1 & VR2 Trimpots, is there a threshold or limit that I should watch out for, as to not damage the receiver?
I stumbled across this thread:
http://audiokarma.org/forums/index.php?threads/sx-750-left-channel-distortion.147992/
On page 2, MarkTheFixer mentions to "NEVER" go above 45mV when adjusting Bias. I am positive that I momentarily went well above this (probably into the 70 or 80mV range) when first messing with these VR's. It was momentary, and nothing seemed to happen. (Fingers crossed everything is ok).
I dont want to be overly paranoid here, and I know that the SM calls for Biasing at 50mV for the first 20 mins, but should I always be adjusting the Bias first (to, say, 50mV), then turning those VR's downward when checking these Transistors? I was thinking that if Im starting with the VR's all the way down, then Im blindly turning VRs up/down while testing, I may be going well above the 50mV threshold, and causing further problems.
I just bought a mid-range DMM to replace my old one, so I suppose I could hook up two at once:
One for keeping an eye on the Bias, and one for checking those Transistors, but that seems like double the work, and a lot to keep my eye on at once. Is there a specific workflow for doing this safely with one DMM?
What do you think? Should I be more careful and adjust Bias first, then turn VRs down to see what ranges Im getting on Transistors?
Or is it safe to continue doing what Im doing because Im using a DBT?
Thanks!
