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#1
Posted to rec.audio.tech
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NEED Schem. for Pioneer VSX-4900S
Hello there;
I was replacing the spkr relay in my Pioneer VSX-4900S and it worked for a moment but the main board was not mounted yet and it moved enough for one of the temp compensating transistors to touch ground and it popped something. Now, the receiver in in protection and the relay won't even fire. I checked all the B+ and B- and they're all there. Check resistors, diodes and transistors. Can't find anything bad so far. I'm hoping some kind soul has a schematic for this model. Thanks, Spark |
#2
Posted to rec.audio.tech
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NEED Schem. for Pioneer VSX-4900S
"Sparkey" wrote in message
... Hello there; I was replacing the spkr relay in my Pioneer VSX-4900S and it worked for a moment but the main board was not mounted yet and it moved enough for one of the temp compensating transistors to touch ground and it popped something. Now, the receiver in in protection and the relay won't even fire. I checked all the B+ and B- and they're all there. Check resistors, diodes and transistors. Can't find anything bad so far. I'm hoping some kind soul has a schematic for this model. Thanks, Spark This model is too old for a PDF schematic, except for probably an aftermarket seller of scanned service manuals, like Justmanuals, servicemanuals.net, and the like. Most likely you have a blown channel. Shorted output transistors, open emitter resistor, bias transistor bad, probably a couple or more resistors bad as well. Mark Z. |
#3
Posted to rec.audio.tech
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NEED Schem. for Pioneer VSX-4900S
On Apr 16, 9:24 pm, "Mark Zacharias"
wrote: "Sparkey" wrote in message ... Hello there; I was replacing the spkr relay in my Pioneer VSX-4900S and it worked for a moment but the main board was not mounted yet and it moved enough for one of the temp compensating transistors to touch ground and it popped something. Now, the receiver in in protection and the relay won't even fire. I checked all the B+ and B- and they're all there. Check resistors, diodes and transistors. Can't find anything bad so far. I'm hoping some kind soul has a schematic for this model. Thanks, Spark This model is too old for a PDF schematic, except for probably an aftermarket seller of scanned service manuals, like Justmanuals, servicemanuals.net, and the like. Most likely you have a blown channel. Shorted output transistors, open emitter resistor, bias transistor bad, probably a couple or more resistors bad as well. Mark Z. Thanks Mark, but I have checked all of the above including just about every resistor on that board. My fear is that I destroyed an ic somewhere on another board where signal and protect routing goes through and returns. I don't want this to be a nightmare. Spark |
#4
Posted to rec.audio.tech
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NEED Schem. for Pioneer VSX-4900S
"Rick" wrote in message
... On Apr 16, 9:24 pm, "Mark Zacharias" wrote: "Sparkey" wrote in message ... Hello there; I was replacing the spkr relay in my Pioneer VSX-4900S and it worked for a moment but the main board was not mounted yet and it moved enough for one of the temp compensating transistors to touch ground and it popped something. Now, the receiver in in protection and the relay won't even fire. I checked all the B+ and B- and they're all there. Check resistors, diodes and transistors. Can't find anything bad so far. I'm hoping some kind soul has a schematic for this model. Thanks, Spark This model is too old for a PDF schematic, except for probably an aftermarket seller of scanned service manuals, like Justmanuals, servicemanuals.net, and the like. Most likely you have a blown channel. Shorted output transistors, open emitter resistor, bias transistor bad, probably a couple or more resistors bad as well. Mark Z. Thanks Mark, but I have checked all of the above including just about every resistor on that board. My fear is that I destroyed an ic somewhere on another board where signal and protect routing goes through and returns. I don't want this to be a nightmare. Spark I took some pics of the schematics and emailed them to the address shown above. Hope this helps. Mark Z. |
#5
Posted to rec.audio.tech
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NEED Schem. for Pioneer VSX-4900S
On Apr 18, 5:20 pm, "Mark Zacharias"
wrote: "Rick" wrote in message ... On Apr 16, 9:24 pm, "Mark Zacharias" wrote: "Sparkey" wrote in message ... Hello there; I was replacing the spkr relay in my Pioneer VSX-4900S and it worked for a moment but the main board was not mounted yet and it moved enough for one of the temp compensating transistors to touch ground and it popped something. Now, the receiver in in protection and the relay won't even fire. I checked all the B+ and B- and they're all there. Check resistors, diodes and transistors. Can't find anything bad so far. I'm hoping some kind soul has a schematic for this model. Thanks, Spark This model is too old for a PDF schematic, except for probably an aftermarket seller of scanned service manuals, like Justmanuals, servicemanuals.net, and the like. Most likely you have a blown channel. Shorted output transistors, open emitter resistor, bias transistor bad, probably a couple or more resistors bad as well. Mark Z. Thanks Mark, but I have checked all of the above including just about every resistor on that board. My fear is that I destroyed an ic somewhere on another board where signal and protect routing goes through and returns. I don't want this to be a nightmare. Spark I took some pics of the schematics and emailed them to the address shown above. Hope this helps. Mark Z. Mark,,,,, Got it! .....thank you very much my friend. This will make my life a lot easier.. Spark |
#6
Posted to rec.audio.tech
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NEED Schem. for Pioneer VSX-4900S
"Rick" wrote in message
... On Apr 18, 5:20 pm, "Mark Zacharias" wrote: "Rick" wrote in message ... On Apr 16, 9:24 pm, "Mark Zacharias" wrote: "Sparkey" wrote in message ... Hello there; I was replacing the spkr relay in my Pioneer VSX-4900S and it worked for a moment but the main board was not mounted yet and it moved enough for one of the temp compensating transistors to touch ground and it popped something. Now, the receiver in in protection and the relay won't even fire. I checked all the B+ and B- and they're all there. Check resistors, diodes and transistors. Can't find anything bad so far. I'm hoping some kind soul has a schematic for this model. Thanks, Spark This model is too old for a PDF schematic, except for probably an aftermarket seller of scanned service manuals, like Justmanuals, servicemanuals.net, and the like. Most likely you have a blown channel. Shorted output transistors, open emitter resistor, bias transistor bad, probably a couple or more resistors bad as well. Mark Z. Thanks Mark, but I have checked all of the above including just about every resistor on that board. My fear is that I destroyed an ic somewhere on another board where signal and protect routing goes through and returns. I don't want this to be a nightmare. Spark I took some pics of the schematics and emailed them to the address shown above. Hope this helps. Mark Z. Mark,,,,, Got it! .....thank you very much my friend. This will make my life a lot easier.. Spark Let us know how it turns out! Mark Z. |
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