I have a Yamaha Stagepas 300 PA system with the left channel out. There are separate power inputs to each Power Amplifier. I repaired the left channel amplifier so both work. However, I still have no left channel output to speaker. Both speakers are good. I have a multimeter and an old Radio Shack signal tracer for troubleshooting and that's it. I checked all voltage inputs to both amps and they match. Don't know how to proceed to check or trace signals or voltages at amp outputs BEFORE they go to speakers. Any help appreciated. Thanks in advance, Dave
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So like the title says, I have an old Stereo Receiver/Amplifier that I picked up from the goodwill, it's a HH Scott Model A510. When I first got it home it had zero output. Opened it up, notice the fuses are missing. Pop in 2 new fuses (AGC4A 250V) and try again, within 5 seconds the L channel fuse POP! I don't see any visible indications of damage or arc burns on the PCB, no popped resistors or diodes, no burnt traces or blown out caps. So I decide to just try another new fuse, POP. Swapped around my R and L speaker wires, and checked the integrity of all wires and connections. Everything looks... -
Hi everyone , I have a rx-A3010 that all alllll the channel working except of Front left , if someone can lead me on what to begin wit it would be very helpful
what I did so far ,
factory reset
test all other channel
tone test
dissasemble and look , visual inspection witout full dissasembly
looked at all the mosfet for temperature to see if they eas operating
scratch my head couple of time
thanks in advance all help is appreciated , service manual are welcome too ! =)... -
Hello,
I know some might say... just buy another one. Sell it as parts..!
So had this AMP for quite some time. Recently I saw light smoke coming out of the AMP. Had my fire extinguisher close by. Just kidding. Turned immediately all devices off from mains.
Let things cool a bit, and opened up the amp device. I clearly saw on the main board which hosts the 5X amp (5.1), 3 10 ohms 1W resistors had their leads looking black, while the rest of the remaining 2 x 10 ohms were brownish as being installed from factory.
Spent some time downloading the Service...06-11-2024, 08:38 AM -
Hi:
I've realized that one of the channels of this amplifier has no proper sound.
This is the signal at the speakers output.
As long as the audio coming in to the amplifier board (blue) looks ok although with some noise due to the wire, I think that there's nothing to look at the preamp section.
Now, I could start looking at components to see whether I find the guilty one.......but I would rather prefer to ask for advice. Here there is the amp. schema. Which points would you check with the oscilloscope to gather... -
Anyone run memory speed tests with an old X58-based triple channel 1st gen or any other >2 channel board? The one I have is a Gigabyte I think.
Anyway I had four 4GB DDR3-1333 modules in the 6 memory slots and got around 11GB/sec memory speeds assuming that it went dual channel since it didn't have enough modules for triple channel. Now I stuck in two more 4GB modules, but they are DDR3-1600. I'm still getting 11GB/sec speeds according to memtest86...
Just wondering, anyone do memory speed analysis on these triple (and higher) channel memory boards? Are there any...
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