FelloCreator
New Member
Hello everyone! I apologize in advance for this book of a post, but I want to be incredibly specific in hopes that you guys will not have to ask a million questions before being able to understand my predicament.
I purchased a Pioneer SX1500TD from a local thrift store recently for $5. It is in fantastic cosmetic condition and mostly works! The man at the store told me the right channel wasn't working, so I opened it up and saw that one of the fuses on the main amp board was blown, replaced it, and ta-da! It worked! Yay! Right?
The other problem was that the left and right channels had a bit of humming in them, as well as some high frequency noise on the left channel. I once again opened up the contraption (the bottom panel) and noticed there were 2 white wires on the end of the main amp board (labeled as 'TP1' and what I'm assuming is 'TP2' on the other side, couldn't really see any markings on the board or the diagram for it).
(The white wires I spake of):
View media item 8056View media item 8055
One was touching the metal framing while the other was not. So, I naively thought to myself, "I'll just make the other one touch the framing, and turn it on!" Well. That was a huge mistake.... soon as I switched the power on the board caught fire near the middle and burned up some resistors. I was able to cut the power swiftly and stop the flame from getting any bigger, but it seems to have done some damage (this is what happens when you don't properly research things). I poked around on the forums a bit and saw someone mention that these wires might be something called an 'idle wire'? I could have horribly misinterpreted that whole thread so I am not sure. Needless to say, neither of the wires are touching the metal framing and are currently just floating in the little free space between the main amp board and the metal framing.
Ok, so now I have some burnt resistors that look like they should be replaced. Here are some photos.
(This resistor is underneath the C17 Mylar capacitor [0.022] on the main amp board):
View media item 8085View media item 8084
(These resistors are located to the left of the 2A 250V fuses *if you are looking at the board with the board#W23-002-0 in the upside-down position, this is how I took the photo sorry if that is confusing*):
View media item 8083View media item 8082
The resistors shown above are:
(1) R25 - Carbon Film - 150
(2) R23 - Carbon Film - 10
(3) R13 - Carbon Film - 2.7k
My questions on this resistor replacement matter are:
(1) Should I try and find the same model resistors to replace these or are there higher quality versions I could purchase?
(2) Where is a good source for these resistors?
(3) Any tips on the actual task of replacing them?
I have to say, the diagrams I found for this SX1500TD online are not quite the same as what I have in the unit. For example, on my main amp board in the unit, the fuses are labeled as "2A". On the diagram, they are labeled as "3A". The only other difference I could really tell was that the "out2" hole on my main amp board is not listed on the diagram. That seems minor, but worth mentioning. Here is a picture.
(Main Amp Board Diagram):
View media item 8086
I am going to stop here, but I also have questions about the capacitors. I do want to replace all of them as some are leaking (the ones on the power supply unit #W16-026). I figure this is a little much for one post so I'll get to that later. Thanks for reading all of this. Any/all help is invaluable to me.
I purchased a Pioneer SX1500TD from a local thrift store recently for $5. It is in fantastic cosmetic condition and mostly works! The man at the store told me the right channel wasn't working, so I opened it up and saw that one of the fuses on the main amp board was blown, replaced it, and ta-da! It worked! Yay! Right?
The other problem was that the left and right channels had a bit of humming in them, as well as some high frequency noise on the left channel. I once again opened up the contraption (the bottom panel) and noticed there were 2 white wires on the end of the main amp board (labeled as 'TP1' and what I'm assuming is 'TP2' on the other side, couldn't really see any markings on the board or the diagram for it).
(The white wires I spake of):
View media item 8056View media item 8055
One was touching the metal framing while the other was not. So, I naively thought to myself, "I'll just make the other one touch the framing, and turn it on!" Well. That was a huge mistake.... soon as I switched the power on the board caught fire near the middle and burned up some resistors. I was able to cut the power swiftly and stop the flame from getting any bigger, but it seems to have done some damage (this is what happens when you don't properly research things). I poked around on the forums a bit and saw someone mention that these wires might be something called an 'idle wire'? I could have horribly misinterpreted that whole thread so I am not sure. Needless to say, neither of the wires are touching the metal framing and are currently just floating in the little free space between the main amp board and the metal framing.
Ok, so now I have some burnt resistors that look like they should be replaced. Here are some photos.
(This resistor is underneath the C17 Mylar capacitor [0.022] on the main amp board):
View media item 8085View media item 8084
(These resistors are located to the left of the 2A 250V fuses *if you are looking at the board with the board#W23-002-0 in the upside-down position, this is how I took the photo sorry if that is confusing*):
View media item 8083View media item 8082
The resistors shown above are:
(1) R25 - Carbon Film - 150
(2) R23 - Carbon Film - 10
(3) R13 - Carbon Film - 2.7k
My questions on this resistor replacement matter are:
(1) Should I try and find the same model resistors to replace these or are there higher quality versions I could purchase?
(2) Where is a good source for these resistors?
(3) Any tips on the actual task of replacing them?
I have to say, the diagrams I found for this SX1500TD online are not quite the same as what I have in the unit. For example, on my main amp board in the unit, the fuses are labeled as "2A". On the diagram, they are labeled as "3A". The only other difference I could really tell was that the "out2" hole on my main amp board is not listed on the diagram. That seems minor, but worth mentioning. Here is a picture.
(Main Amp Board Diagram):
View media item 8086
I am going to stop here, but I also have questions about the capacitors. I do want to replace all of them as some are leaking (the ones on the power supply unit #W16-026). I figure this is a little much for one post so I'll get to that later. Thanks for reading all of this. Any/all help is invaluable to me.
