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Does less than 3v to the MOSFETs seem right? The things max out at 140v. I ran out of time last night to check the main power circuit components but I'm thinking that might be the problem possibly that main relay like you were saying. The speaker output relays I thought were not engaging are working fine however.
Russound x125 Amp Relay Won't Stay Engaged
- Thread starter naps1saps
- Start date
Maybe
https://www.manualslib.com/manual/1055398/Onkyo-Ht-R570.html?page=13#manual
My Manual say's on page 13 the Voltage is -6vdc and +6vdc my problem was one channel the SBR a co-worker hooked up a speaker while the unit was on. Blew the last stage and so far one diode, resistor and small Transistor, its all I've had time to do but I need to check the whole pre-amp section now because of those parts failed.
kv
https://www.manualslib.com/manual/1055398/Onkyo-Ht-R570.html?page=13#manual
My Manual say's on page 13 the Voltage is -6vdc and +6vdc my problem was one channel the SBR a co-worker hooked up a speaker while the unit was on. Blew the last stage and so far one diode, resistor and small Transistor, its all I've had time to do but I need to check the whole pre-amp section now because of those parts failed.
kv
Can you help me identify probable preamp circuit components in my first image post? This is the first amp I've ever gotten into. I'm getting lost with all the extras like the delay circuit, trim volume, and audio sensing + trigger circuits. And the jumpers!!! There are so many of them I'm going nuts. I believe there is a problem with the triggering circuit because the relay in the middle of the board is a strange one (8 pin double relay single coil) and doesn't seem to be engaged. It's an HJR 1-2c L-09v. The coil is getting +12v but no ground. And the "ground" from the relay comes from a circuit so it must have a switched ground but this is hard stuff lol. What did I get myself into. I'm tempted to bypass the relay and see what happens. What do you think? I don't need an audio sensing trigger circuit because this is going to be switched with my receiver.
It would be the blind leading the blind, this is my first amp as well and I'm just a Hobby guy that worked in a TV shop my boss did all the Amplifiers, no formal education in Electronics, if you have an education in Electronics you have more luck in understanding the problem. Sorry man
Still like I said before your amp is made by a company unwilling to assist you really need a schematic. The Onkyo receiver is a cheap amp and if I cannot justify purchasing parts or find it's also affecting the audio distribution board I will just leave the last output stage lifted from the circuit, and use only those outputs available, the "Souround Back Right" for this guy doesn't matter.
I will post my success or failure in a thread, the only reason I'm able to do what I'm doing is because I built a Plasma Speaker with the help of some really smart people both here on this site and another site. I can't say enough about the people here, great guys and gals.
kv
Still like I said before your amp is made by a company unwilling to assist you really need a schematic. The Onkyo receiver is a cheap amp and if I cannot justify purchasing parts or find it's also affecting the audio distribution board I will just leave the last output stage lifted from the circuit, and use only those outputs available, the "Souround Back Right" for this guy doesn't matter.
I will post my success or failure in a thread, the only reason I'm able to do what I'm doing is because I built a Plasma Speaker with the help of some really smart people both here on this site and another site. I can't say enough about the people here, great guys and gals.
kv
First I'll recommend you review the six-step troubleshooting procedure. It's one I like and following it seems to work.
You can learn about at http://www.tech-service.net/Troubleshooting/six_step_troubleshooting_process.html
If you wish to proceed, let me know. Then I recommend you obtain a service manual or schematic. Then we both can literally on the same page.
Let me know.
Kv, the same deal for you.
You can learn about at http://www.tech-service.net/Troubleshooting/six_step_troubleshooting_process.html
If you wish to proceed, let me know. Then I recommend you obtain a service manual or schematic. Then we both can literally on the same page.
Let me know.
Kv, the same deal for you.
Thanks man, going to complete some more cement next week hopefully be done Saturday, I'll do some reading and digesting, got the Manual already. BTW, I purchased a Frequency Geni, and have a scope, MM just been probing with the MM looking for leaky transistors or shorted diodes. Found like 3 already, but the pre-amp circuit is very confusing I must admit.
I've got a lot of experience trouble shooting but, always open for a better method. I remember a kid only 9 years old ask's me if he can watch me work on a dishwasher, I tore down the front panel removed the handle but you have to put other parts in sequence, I found the trouble and was putting it back together when out of nowhere this kid say's hey doesn't that part over there go in first? Sheesh, I'm so glad that kid
was there watching it saved me 20 minutes in an already bad day.kv
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@killivolt
I have some recommendations on some apps that can come in handy. I wouldn't use them in a shop environment but they could help in some situations where you don't have access to other test equipment, especially during the initial problem determination. I'll post a list later when I get home.
On edit ... Fixed some autocorrect errors.
I have some recommendations on some apps that can come in handy. I wouldn't use them in a shop environment but they could help in some situations where you don't have access to other test equipment, especially during the initial problem determination. I'll post a list later when I get home.
On edit ... Fixed some autocorrect errors.
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@killivolt
Here is the android app test equipment I spoke of earlier, as seen on the left side of my tablet. I have the same apps on my phone as well. They are priced as FREE.
I haven't chosen which spectrum analyzer I like better, so they both still reside. I would use them in audio work to identify the frequency of what we all call hum. Naturally if it is low frequency, 60 Hz or 120 Hz or other power line related frequencies, as rectified and technically identified as ripple, it would show up. If it doesn't relate to power line frequencies, I wouldn't look in the power supply area from the problem.
The frequency counter is also an oscilloscope.
Both of those devices use the microphone as the input, so you can place your phone near a speaker and use a low level signal to keep peace in the house.
The function generator uses your headphone jack to supply a number of frequencies and signals, just like a function generator on the work bench.
The wifi analyzer, I use to ensure any network I use, the competing networks won't interfere. You'd be surprised on how many wifi networks are on the default channel, channel 6. The speed test is an internet speed test.
Any way, here is the picture .....
0
I added the picture so you can identify the icons.
I chose these so anyone working on a audio system can send screen shots of what they are "hearing" vice describing it. Hum as a low frequency sound isn't very description, yet most immediately think of a power line related frequency, but I can't say that everyone who uses the term hum follows that definition.
Here is the android app test equipment I spoke of earlier, as seen on the left side of my tablet. I have the same apps on my phone as well. They are priced as FREE.
I haven't chosen which spectrum analyzer I like better, so they both still reside. I would use them in audio work to identify the frequency of what we all call hum. Naturally if it is low frequency, 60 Hz or 120 Hz or other power line related frequencies, as rectified and technically identified as ripple, it would show up. If it doesn't relate to power line frequencies, I wouldn't look in the power supply area from the problem.
The frequency counter is also an oscilloscope.
Both of those devices use the microphone as the input, so you can place your phone near a speaker and use a low level signal to keep peace in the house.
The function generator uses your headphone jack to supply a number of frequencies and signals, just like a function generator on the work bench.
The wifi analyzer, I use to ensure any network I use, the competing networks won't interfere. You'd be surprised on how many wifi networks are on the default channel, channel 6. The speed test is an internet speed test.
Any way, here is the picture .....
0I added the picture so you can identify the icons.
I chose these so anyone working on a audio system can send screen shots of what they are "hearing" vice describing it. Hum as a low frequency sound isn't very description, yet most immediately think of a power line related frequency, but I can't say that everyone who uses the term hum follows that definition.
How could I use my HP 15MHz Function / Arbitrary Waveform Generator Model 33120A
I'm not sure if this will also assist? I figured I could send a Waveform in once I've purchased and installed the pre-amp parts then lift the Outputs on that channel, do a test with my Oscope
What do you think @JoeJester ? I have no idea yet how to use it either but I just downloaded the Manual.
Thanks again,
kv
I'm not sure if this will also assist? I figured I could send a Waveform in once I've purchased and installed the pre-amp parts then lift the Outputs on that channel, do a test with my Oscope
What do you think @JoeJester ? I have no idea yet how to use it either but I just downloaded the Manual.
Thanks again,
kv
Yes, I have the Service Manual but it only parts and circuit definition, it does have voltages with component part # and locations.
https://www.manualslib.com/manual/1055398/Onkyo-Ht-R570.html?page=13#manual
Page 13 SBR output channels got fried, it took some of the pre-amp circuits with it. As soon as I get some parts in I'll lift the outputs separating the pre-amps so as to not further cause damage, like a I said both output transistors are shorted, in the pre-amp I have one resistor, diode, and transistor I have found bad. I still need to remove the circuit board to test for any other damage.
I'll open another thread so it doesn't get to confusing. Take a look I'll put the Model Number HT-R570.
kv
https://www.manualslib.com/manual/1055398/Onkyo-Ht-R570.html?page=13#manual
Page 13 SBR output channels got fried, it took some of the pre-amp circuits with it. As soon as I get some parts in I'll lift the outputs separating the pre-amps so as to not further cause damage, like a I said both output transistors are shorted, in the pre-amp I have one resistor, diode, and transistor I have found bad. I still need to remove the circuit board to test for any other damage.
I'll open another thread so it doesn't get to confusing. Take a look I'll put the Model Number HT-R570.
kv
