I have an Onkyo TX-SR607 MDD/MDC/MDF that will no longer power on. When I plug it in, the standby light comes on. When I hit the ON/STANDBY button, I hear a relay click and then 1 second later I hear another click and the standby light begins flashing. I believe this is the Onkyo Protect Mode.
The initial failure occurred when I was watching a movie through the receiver and heard a loud pop from the receiver. The standby light began flashing. After looking around I noticed that a speaker plug had been partially unplugged from the RIGHT-FRONT speaker. Possibly the plus shorted to the negative?
I have begun troubleshooting and repair of the problem. I obtained a TX-SR607 Service Manual (http://www.hifiengine.com/manuals/onkyo/tx-sr607.shtml
). All fuses are intact. Thus far I have determined that R6071 (82 ohm) failed open, R6101 (.22 ohm) failed open, Q6051 (2SC5242) failed short, Q6061 (2SA1962) failed short, and Q6011 (2SC1740S) failed. I replaced all of these parts. I also replaced Q6031 and Q6041 due to suggestion on page 137 #5 in the TX-SR705 Onkyo service manual since it is a similar unit and the service manual seems more complete (http://www.scribd.com/doc/34289802/Onkyo-TX-SR705-Service-Manual
). I then verified R6081, R6091, R6021, R6071, and C6041 were all intact and the still the right value. Everything I have found seems to be localized in the RIGHT-FRONT amplifier chain.
I adjusted all idling adjustment resistors counter-clockwise to go through the procedure to reset the idling current, but the receiver still clicks on and then 1 second later clicks off with the StandyBy light flashing, so there must be something else beyond the RIGHT-FRONT amp chain that has failed.
I am still holding out that there is just one or two more simple things to overcome to fix this issue. My cheapness and my sense that I *should* be able to find and fix this problem are keeping me from just buying a new receiver. I have fixed the obvious and now just need a little guidance as to where to look next.
I think my next step will likely be to try and determine which part of the protection circuitry is causing the unit to trip off. There is a VOLH line that comes from the output stages as well as IPROTECT which is over current protection. My issue is the receiver doesn't stay on long enough to really make any measurements.
Thanks for your help.