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 ! =)... -
Hi all forum members,
Fyi, i have been working on this old model PCT-4082 (4 channel car amplifier). The owner said only one channel is working.
My initial finding is this amp originally use Toshiba 2SA1943 and 2SC5200 transistor for its output but after opening the top casing i found it used Toshiba A1941 (pnp)and C5198(npn). I desoldered all the 4 pairs transistors and found 1 piece A1941 open(tested "OL" on all legs) and replaced the 1st pair with 2SA1943 and 2SC5200, thats why you can see in the picture it is the bigger size transistor. The other A1941 and C5198 all... -
Hello Everyone,
I have an Onkyo TX-SR353 Audio/Video Receiver (5.1 ch with HDMI) that I am having a really hard time diagnosing and I'm about to throw this in the junk and go buy a new unit that is on sale until the 7th.
Symptoms:- Intermittent (part of the reason why i'm having a hard time isolating problem), sometimes will work for 10+h at a time without issue
- Original symptom was wife reported loud banging noise (like someone was banging on the wall with their fists) from the LEFT SURROUND speaker and then the unit shut off.
- I swapped the Left and Right surround
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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
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