According to owners manual when standby light flickers on and off it's a voltage issue, it still plays the CD for up to 20-30min and then it goes into service protection mode . I unplug the unit wait a few min and turn it back on and while in standby mode the blue light keeps flickering on and off , pop in a CD and plays again for 20min and goes back to service protection mode. I was hoping someone has a schematic they can share so I can have a tech look deeper into what is causing this issue.