You can add speakers so long as your ohm load stays within the manufacture specks for safe operation but you will not have a true 7.1 system by definition.
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How about if you disconnect all the speakers and try again. Then what? Add one at a time until it either fails again or starts working with all speakers attached.
Still fails with all speakers disconnected? Take it in to a shop.
Depending upon transmmission bit rate, if the transmission is > then 6130 bit rate it will automatically change to 'STRAIGHT' mode and in this mode only two front speaker will work.
Swap the speaker wire from left rear to right rear if the speaker was from RR now work on LR side this prove the speaker OK then you problem in the receiver
If you swap the RR speaker to LR side and still not work then you
have that RR speaker open
Make sure you hook up speakers cable properly and not short from both terminal speakers and receiver the RED and Black poles
Let me know how you go
Swap the rear right speaker to rear left make sure the speakers and speakers wire are OK
Initializer the unit as follow set the unit in STBY mode if you are not sure which mode turn off the unit with the remote control now the unit is in STBY mode. Pressing STRAIGHT and AUDIO SELECT keys simultaneously then press power STBY button on front panel the display will show 1: Analog ByPass use the PROGRAM knob to move up to 13 PRESET INHI then press 1 or 2 keys to change to PRESET RSRV then turn off power now unit reset to factory just turn on and try it
Let me know how do you go
Cheers
PS: this model have an update firmware if your is still under warranty bring it back to Yamaha or 1 of the service center Yamaha they are able to update for you. Due to confidence I can not post that firmware sorry for that inconvenience
As simple as this sounds, try hitting the speaker a/b button on the front of the unit, next to the headphone jack. I had the same problem, and was about to package the whole thing back up and go back to Best Buy when I hit this button and then the audio test worked.
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