Turns out I'm still a complete bonehead.
I lost my +12 battery connection while I was bench testing and now the amp doesn't turn on, power LED glows very dimly.
My guess is I popped something in the turn-on circuit. Does anyone have a schematic for this amp or one similar? (PS gate drive is a volt-ish DC, should have checked the reading before tearing it down)
Live and learn, that's why I'm working on these cheap amps.
Thanks in advance gents. Worst case scenario I just buy the service manual for a one-off repair.
I lost my +12 battery connection while I was bench testing and now the amp doesn't turn on, power LED glows very dimly.
My guess is I popped something in the turn-on circuit. Does anyone have a schematic for this amp or one similar? (PS gate drive is a volt-ish DC, should have checked the reading before tearing it down)
Live and learn, that's why I'm working on these cheap amps.
Thanks in advance gents. Worst case scenario I just buy the service manual for a one-off repair.
http://www.bcae1.com/temp/kenwood - Kac-x621.pdf
Kenwood uses similar circuits in a lot of amps. Page 14 of this manual has the remote circuit.
Kenwood uses similar circuits in a lot of amps. Page 14 of this manual has the remote circuit.
Thank you Perry, I should have check the repair Bible first. 
I also should have walked away when I saw the 26 screws holding down the transistors, diodes and regulators.
I also should have walked away when I saw the 26 screws holding down the transistors, diodes and regulators.
OK here's another question.
My meter is reading the diode as open. I get a little blip as soon as I probe it and goes right back to OL.
Is it possible it's passing just enough current to mess with the turn-on circuit but not enough to power it completely?
My meter is reading the diode as open. I get a little blip as soon as I probe it and goes right back to OL.
Is it possible it's passing just enough current to mess with the turn-on circuit but not enough to power it completely?
It's marked D70 in the schematic you linked and the symbol suggests it is a Zener. (Cathode marked with a Z)
Thank you, Perry. I compared 5 or 6 different different schematics (both from your site and in other databases) to the amp and couldn't figure out what was wrong.
I ended up pulling the PS FETs to explore things further (see if I could reduce the current draw,) gate drive signal looked good and it was turning on correctly now. That's when I realized my mistake, I didn't have the audio input board connected correctly.
TL;DR I'm a moron who likes making things hard on myself.
I expect I'll have more questions with this amp as I explore a supposed issue with the output section. Can I edit the title of this thread or would a new thread be more correct?
Thank you for being so helpful and patient with me as I learn.
I ended up pulling the PS FETs to explore things further (see if I could reduce the current draw,) gate drive signal looked good and it was turning on correctly now. That's when I realized my mistake, I didn't have the audio input board connected correctly.
TL;DR I'm a moron who likes making things hard on myself.
I expect I'll have more questions with this amp as I explore a supposed issue with the output section. Can I edit the title of this thread or would a new thread be more correct?
Thank you for being so helpful and patient with me as I learn.