Seems like the Left output amp died. Does anyone have circuit diagrams for the device. Or, who repairs.
Stereo amplifies are just two mono ones joined together. So if you have a problem with the left you can always look at the right side if that is working good. As all the parts are the same and so are any voltage readings taken. A visual inspection is the first option, if something looks strange in the left channel compared to the right, then replace it with the same part you can see in the right. The only problem is when the amp uses one power amp for both channels. But in that case replace the thing.
Apart from that individual parts, such as the power supply, you can leave alone, as they would affect both channels.
SOURCE: Output volume has dropped in right channel
dear sir,pls check the HT voltage fuse, LTsupplay also and out put stage,and volume controle,
SOURCE: Left channel out
There are NO mechanical pots on the system. The "pots" for volume are a special bitsequence comparator, and the signal for the gain on the amp is a modulated matrix signal.
The most common problem for this kind of amps are the safety-thermal switch... They are normally located really close to the output for the speakers. Normally gray or black boxes (30x10x40mm). Flick your finger on them with volume at 9 o'clock...
If you can hear a click, and the sound appear again you've found the sollution.
NOTE! Hazardous currents are present inside the cabinet, mind your fingers, arms and other bodyparts.
SOURCE: NAD C272 Amplifier: Intermittent left channel
My solution was actually indeed the output protection relay. What I did was to open up the relay and use contact cleaner and a very fine abrasive to clean the contact surfaces of the relay. After that, the problem was gone!
The way to diagnose this for me was to run the amplifier open until the problem recurred and to simply tap the relay's box. The sound came on immediately, and I was convinced.
SOURCE: My amplifier has one pair of rca inputs. radio only has 1 output
Subwoofer signals should be MONO - not stereo (hence the single Component out on the radio)
Only use one RCA to send signal to your amplifier.
If you use a Y splitter - the signal voltage will be cut in half - deteriorating the quality, and therefore amplifying "dirty" signal.
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SOURCE: Marantz Pm-7200 left channel weak compared to the right
hmmm. Let's start by swapping the wires you are using for your speakers. Double check the wire connections first, then take the left and place iton the right and vice versa.
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