• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

SX-1000TD Odd problem - hoping for some help

Channels seem to sound the same at #10 terminals. Harder to tell there....not as much gain, so can't get a lot of volume there...but I am pretty confident that they are the same at that point.

You may recall that I compared all resistors, R to L...all measured very close (resistance).

Freeze spray would be quite difficult, given that board has to pulled up more than 90 degrees to get at components...while unit is under power. Scary.

Any alternatives for investigating resistors while under power (for example, measuring voltages across them)?

FYI, no resistors have been replaced.
 
spark1 said:
Freeze spray would be quite difficult, given that board has to pulled up more than 90 degrees to get at components...while unit is under power. Scary.
Click to expand...

Just a thought, when I was working on my power board, I tied a pice of string from one upper screw hole to the other, the right length so I could loop it under one of the control knobs. Held the board fairly stable in one place so I could use two hands to work, without stressing the wires passed 90 degrees.
 
The alternative is to just replace the resistors.
Try swapping the pin 10 input wires and see if it switches the problem channel. That should be easier than changing all the resistors. At low volume levels human ears are less sensitive to high and low frequencies, so they may sound the same, you just can't hear the difference.
 
As I said, channels sound the same at #10 terminals, and loudness function has equal effect on both channels there, so no reason to swap.

I'm not going to replace all the resistors...for me, that's a "bridge too far". Next would be all the film caps, and then the pots and switches. This unit is just not worth that kind of time and expense.

Thanks for all the help, but I'm giving up on this one.
 
Last edited:
Perhaps my friend will choose to take it to a repair shop, where they are equipped to more easily find the trouble. On the upside, this pretty much cured me of trying to do repair work in the future!
 
A scope and a signal generator may have helped with this, but I think you did just fine with the equipment at hand.
I am curious to find out what the fix is if he does take it to a shop, or what he does with it if not. It is too good a unit to just trash or scrap it.
See you around!
 
I doubt he will pay shop rates to have it repaired, unfortunately. I would guess it is destined for a shelf in his basement or the scrap heap. But if he chooses to have it fixed, I'll try to find out what the problem was.

As for repair...now that I've learned that the logical trouble isolation process is not valid in electronic circuits, I've realized I just don't have the necessary capabilities...nor the ability to acquire them. I'll stick to simple things going forward.
 
I know you said you're done with working on this, but I thought of you and your unit when I watched this troubleshooting video:
 
Spark1. I'm sorry you though in the towel. I've been following this thread with much interest from the beginning. I rebuilt one of these about 3 years ago, I didn't have the problems you had but I had my ups and downs. From what I could find out about this unit it was only made in 1967 and for European distribution and sales.The schematics and the transition from Japanese to English was rough. The schematics I had were spot on but there were mistakes in the translation and the orientation of some of the caps were incorrect. If this was just a one year run when they started to run out of parts near the end and they would substitute other boards and parts from what they had in stock. I believe you proved this by some of your posts. I replaced everything on the boards, after all this time it was well past it's shelf life. Please don't scrap this receiver, it's one of the finest Pioneer's ever made and with 50 wpc it will drive all efficient speakers with ease. I have tube amps and receivers and this one out shines them all. You say your in the Great Midwest, I'm in southern Indiana, If you don't want the unit maybe we can come to some deal and I'll take it off your hands. Please don't junk it, it's worth saving...Fritz
 
iplagolf said:
Spark1. I'm sorry you though in the towel. I've been following this thread with much interest from the beginning. I rebuilt one of these about 3 years ago, I didn't have the problems you had but I had my ups and downs. From what I could find out about this unit it was only made in 1967 and for European distribution and sales.The schematics and the transition from Japanese to English was rough. The schematics I had were spot on but there were mistakes in the translation and the orientation of some of the caps were incorrect. If this was just a one year run when they started to run out of parts near the end and they would substitute other boards and parts from what they had in stock. I believe you proved this by some of your posts. I replaced everything on the boards, after all this time it was well past it's shelf life. Please don't scrap this receiver, it's one of the finest Pioneer's ever made and with 50 wpc it will drive all efficient speakers with ease. I have tube amps and receivers and this one out shines them all. You say your in the Great Midwest, I'm in southern Indiana, If you don't want the unit maybe we can come to some deal and I'll take it off your hands. Please don't junk it, it's worth saving...Fritz
Click to expand...

I don't own it. Its disposition is up to the owner. The idea of replacing all the resistors was too much for me...and of course the same rationale would call for replacement of all mylar caps as well. At some point, the investment of time and money just can't be justified.

When/if I get an oscilloscope, I may give it another shot if my friend still has it on a shelf. But honestly, this project put me off wanting to do much other than simple maintenance. Discovering that logical trouble isolation is not an effective process really set me on my heels.
 
OK, see if he wants to sell it. I asked where you are. I don't want this unit scraped. I can fix it.. Don't give up, you are exactly what this what ever we are needs to keep this going.....I just have more equipment and a little more knowledge, like Ben Hogan said about his golf game, I dug it out of the earth...That's me with this equipment...Talk to your friend and let me know...Don't Let this unit die...
 
Several others have asked about it as well. I will certainly let him know. He lives in western MO.
 
You must log in or register to reply here.
Back
Top Bottom