SA-7500 relay and other problems

[SMD88]

I have them available here.

I would be all over them if I was in the US. The only idiotic ebay seller in this idiotic country, is charging TWO DOLLARS, EACH!!! I sent through an offer to pay $1x25 pieces, but I bet it will be rejected. Paying $25 for 25 KSA1845 transistors makes me rather sick considering what they are worth! But, they will not be available until November so I have no choice. I may just raid the 7500 and another amp I have with issues rather than paying that disgusting amount of money. If I did need them in a hurry, I would just order from the US. I have two SA-9500 amps and a SA-9500 II amp to rebuild. Those 25 would not even be enough. *sigh*

 

[SMD88]

Ended up getting the 25 1845s for $25... I hate myself, lol. 100 for $22 on mouser. I will be ordering a crapload once they are back in stock.

 

[merlynski]

Mind to say where you are located?
Did you get your wiring sorted out?

 

[SMD88]

Mind to say where you are located?
Did you get your wiring sorted out?

I am in Australia, on the Gold Coast.

The wriring looks okay, still not sure about the wire wrap that looks like there was a wire connected to the wire sticking out at the top. There is a wire connected to the bottom.

Not sure about the yellow wire connected to the power amp board here, either.

 

[merlynski]

I see no problem with the wrap on either of those, from the view provided. It is not unusual for a wire wrap tool to leave a little bit of a tail of wire at the top of a pin. It would be highly unusual for a wire wrap on a pin to be in the middle of a wire (never seen it done). When I was doing wire wrap assemblies in telecom, multiple connection were stacked wraps on a longer pin, never in the middle of a wire, never a wrap around the outside of a previous wrap. The pressure of the wrap process actually creates a tiny pressure weld where the wire contacts the pin corner. The telecom pins were tall enough to stack 3 correct wire wraps, and repeated connections were daisy-chained from pin to pin. The Pioneer wire wraps I have seen were just one wire on one pin.If there were multiple connections to a common point, there were multiple pins set in the board, with one wrap/wire per pin.

 

[SMD88]

I see no problem with the wrap on either of those, from the view provided. It is not unusual for a wire wrap tool to leave a little bit of a tail of wire at the top of a pin. It would be highly unusual for a wire wrap on a pin to be in the middle of a wire (never seen it done). When I was doing wire wrap assemblies in telecom, multiple connection were stacked wraps on a longer pin, never in the middle of a wire, never a wrap around the outside of a previous wrap. The pressure of the wrap process actually creates a tiny pressure weld where the wire contacts the pin corner. The telecom pins were tall enough to stack 3 correct wire wraps, and repeated connections were daisy-chained from pin to pin. The Pioneer wire wraps I have seen were just one wire on one pin.If there were multiple connections to a common point, there were multiple pins set in the board, with one wrap/wire per pin.

Exactly as you say, there should not be a wire on the bottom and another on top from what I've seen of Pioneer. Thank you for the explanation! It must just be a random bit of wire at the end of the wrap.

The yellow wire in the second picture is connected to a leg of a cap. I stupidly forgot to take a photo before I swapped out the caps, so am unsure if it is on the correct leg or not. I see no instructions in the service manual, either. I have to have a search through my transistors to see if I have an output to replace that one with the broken leg. No idea how that happened. I do remember the legs being horribly fragile, though.