Comment on Mission MS 200 Schematics / Repair pointers
boojumliussnark@lemmy.world 7 months agoThanks again for looking at this!
The NTC meassures very low ohm, in circuit it’s around 14 ohm.
The markings on the “receiver” board are: +27v, gnd, -27v and “mute”.
I would like to try to do some “divide and conquer” debugging, as the total number of components is rather low. I would like to try to eliminate the different “blocks”. Like I can connect it up, and measure the voltage after certain “stages”. Maybe after the inrush current limiter? To my very limited understanding that should be right at the end of the AC block/stage? Maybe dividing the board into 3 or 4 stages like this I could start to narrow down the issue?
Goodman@discuss.tchncs.de 7 months ago
You could try that yeah, start at the AC input and try to find where the circuit fails. If you want to do that though I’d recommend that you take 2 good pictures of the front and the back, put them side to side and sketch out the circuit diagram. It’s no use trying to measure voltage nodes if you don’t know what they are supposed to be. Question is if that is worth your time, there is certainly some educational value but there is always a chance that you just won’t find the fault.
If you do make a schematic then react to my post. I’ll try to help you with reading the circuit if you want.