So i found a Yamaha RX-700 amplifier in the garbage and it was dusty and all. But i cleaned it up , also volume knobs and stuff. It works but the thing is ,
left side of the speaker doesn't isnt that bassy as Right side of the speaker .
I tried many different speakers, different outputs and inputs. What could be the problem ? Everything seems fine inside .
Thank you !🙂
Also got a schematic .
left side of the speaker doesn't isnt that bassy as Right side of the speaker .
I tried many different speakers, different outputs and inputs. What could be the problem ? Everything seems fine inside .
Thank you !🙂
Also got a schematic .
Did you clean all the switches and pots? Could be related to the bass or treble pots, tone bypass switch, loudness control pot, etc. The power supply is shared, so that isn't likely to be the problem.
Yes i cleaned all the switches and pots . I will try to clean them again see if it fixes it but im certain its not that .
Your schematic isn't complete.
I used to work on these under warranty. They were pretty good and didn't have any one failure mode. Have you checked the speaker relay?
It's a nice receiver. It would be good to get it fixed. If the relay checks okay, then it's time for troubleshooting and I'm afraid you will need some electronic test equipment most likely.
-Chris
I used to work on these under warranty. They were pretty good and didn't have any one failure mode. Have you checked the speaker relay?
It's a nice receiver. It would be good to get it fixed. If the relay checks okay, then it's time for troubleshooting and I'm afraid you will need some electronic test equipment most likely.
-Chris
I would rig up the cabling to perform a loopback test of frequency response on both channels using a PC with RMAA or ARTA or whatever you like (line-out --> CD/tape/VDP in --> headphones out --> line-in/combo-in, with adapters as needed). Be very careful with the volume control in order to avoid damaging the input (which probably will be able to output 10s of Vrms when the input may only accept ~1 Vrms), you are not too likely to need a setting very much higher than 9 o'clock or so and best keep it turned down when not measuring.
Any anomalies? Best obtain results with loudness both off and on.
If frequency response is very much the same in both channels, there is little left besides bad contact in protection relay or speaker selector... maybe a hairline crack in the board.
If there is a substantial difference - there are a few more options - it might be a bad coupling capacitor or bad capacitor or resistor in feedback, a problem in the loudness circuit, and that's not all.
Any anomalies? Best obtain results with loudness both off and on.
If frequency response is very much the same in both channels, there is little left besides bad contact in protection relay or speaker selector... maybe a hairline crack in the board.
If there is a substantial difference - there are a few more options - it might be a bad coupling capacitor or bad capacitor or resistor in feedback, a problem in the loudness circuit, and that's not all.
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