Hello everyone!
I have an Alpine MRX-V60 that seems to power up but there is something wrong in the audio part. I cannot get any voltage to the speaker terminals.
I have gotten pretty good at figuring out power supply and output failures but this one seems to have micro controlled circuits and a multitude of dual channel op amps. I don't know if these are even serviceable or if anyone has a schematic for this amp. I have had the worst luck trying to fix digital stuff but I am still have lots of questions as to how the function and how to diagnose faulty digital stuff.
Anyone who could possibly point me in the correct direction would be appreciated. I can post pictures for anyone willing to help me.
I have an Alpine MRX-V60 that seems to power up but there is something wrong in the audio part. I cannot get any voltage to the speaker terminals.
I have gotten pretty good at figuring out power supply and output failures but this one seems to have micro controlled circuits and a multitude of dual channel op amps. I don't know if these are even serviceable or if anyone has a schematic for this amp. I have had the worst luck trying to fix digital stuff but I am still have lots of questions as to how the function and how to diagnose faulty digital stuff.
Anyone who could possibly point me in the correct direction would be appreciated. I can post pictures for anyone willing to help me.
At the speaker terminals i was looking for anything >0v AC, right now that is all that i have and my RCA inputs are jumping around .4-.7v AC
Would I sound like an idiot if i said "I cant find any output transistors?
I have 4x IRF3205s bolted to the heat sink. and some rectification TO-220 cases next to them, but on the other side there is nothing. I have not pulled the mainboard out of the aluminum case yet and I suspect they could be under there?
Would I sound like an idiot if i said "I cant find any output transistors?
I have 4x IRF3205s bolted to the heat sink. and some rectification TO-220 cases next to them, but on the other side there is nothing. I have not pulled the mainboard out of the aluminum case yet and I suspect they could be under there?
I'm not too sure where to find either of the "output filter" or "rail voltage". I am rapidly thumbing through my notes and found that on previous repairs I found rail voltage at the largest capacitors on the board. I checked these ones and with my test lead on the ground terminal of the power coming into the amp and my red probe on the legs of all of the capacitors, I cant find any voltage greater than 0v DC
With the black probe on the amp ground and the red on the positive terminal of the rectifier, power up the amp while watching the meter. Does the voltage change when you power up the amp? Watch the meter from just before you apply remote voltage to about 10 seconds after applying remote voltage.
The 2 bridged channels and the sub woofer channel are oscillating DC at start up
I enjoy following your steps but I am always left wondering what you are thinking, its rewarding chasing this down and watching my meter jump around, but what are you thinking is a possible cause of this symptom? or what is leading you to tell me to check this or that?
I enjoy following your steps but I am always left wondering what you are thinking, its rewarding chasing this down and watching my meter jump around, but what are you thinking is a possible cause of this symptom? or what is leading you to tell me to check this or that?
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