This Harmon Kardon HK-3390 receiver sat unused for around 5-6 years and working fine when put away. Moving forward, a few days ago, plugged it in and took about 15 to 20 on/off times for it to "kick" in. Powering it on, the light would go from stand by to on but no display or relay clicks and after 5 seconds back to stand by. Eventually after so many tries, it does power up and when it does, is business as usual, sounds great and it might play anywhere from 5 minutes to hours before shutting down again on its own.
What I have noticed going inside... no overheating, idle current around 20mv on both channels, speaker terminals DC -15mv and -27mv. This happens whether the Pre in and Pre out jumpers are on or not. On a couple of occasions, the display has read.... "Check Input"
What I have noticed going inside... no overheating, idle current around 20mv on both channels, speaker terminals DC -15mv and -27mv. This happens whether the Pre in and Pre out jumpers are on or not. On a couple of occasions, the display has read.... "Check Input"