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Yamaha newbie A-700 resto thread

analogwisdom said:
I was not expecting this to be so tiny, lol. But it's not about the size, it's how you use it, right???? LOL. Gonna do some reading on how to use it and practice on some kits I have, it's all been flux with the desoldering vacuum tool for me so far.
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Soder-Wick desoldering braid 80-4-5 is the correct size to use for large pads on circuit boards. I wouldn't go smaller than this, depending upon the application of course. I also use the next size larger (80-5-5) which is not much wider than what you purchased. Get some experience with using it and you'll have found a new best friend!
 
analogwisdom said:
I've been researching oscilloscopes. Seems like the always recommended in the past analog ones are getting just as expensive as entry level new digital ones. I still want an analog one, though. Probably Tektronix, probably refurbished. I'd hate to have to try and repair a repair tool, lol.
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You just missed a great Tek scope recently sold on BT by AKer Tinman. Very knowledgeable guy and any scope he sells is guaranteed good. Send him a conversation and see if he has any available. Or just place a WTB ad on BT.
 
analogwisdom said:
I didn't think to check the underside of boards where that glue is for parts that'll need replacing
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It's hard to see but found a rotted out circular pad trace on my A-1020 tonight to illustrate. Corrosive glue above seeping to the solder side. They look more brown than the other solders but it's not from flux. It's a corroded jumper as usual. Why are the jumpers more prone to electrolysis than other components? Different metals. Check your jumpers under the DSBG area yamagents though they may seem insignificant. There's much fuss & discuss as to which jumper metal replacements we use but I could care less...just as long as it's a conductor. Cuz at the end of the day, if the glue wasn't there this wouldn't be a discussion & any metal would suffice otherwise. I use copper from old telco house wiring, 24 gauge jones from the golden era of service wire.

-Esoteric redneckisms

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Hey guys, haven't disappeared!

I've got all the replacement burnt resistors and transistors replaced, and the 400Ω resistors in place of the output devices. I'm waiting on a set of helping hands to come so I can work on the replacement button and getting it to fit. I've been making do without a set of helping hands so far, but it was time for me to finally get some. I've got one of those rotating PCB holders on the way, too. That'll be nice for smaller boards.

I'm also praying that the channel problem I was having before everything blew up is fixed. I have checked everything I can think of and it all seems good. Connectivity/continuity between ribbon cables, the solder joints of those cables, the cables are all connected and routed to correct places, all of the buttons/switches are clean and have continuity, there are no cold or bridged solder joints on any of the boards... if the wire problem I talked about in post #189 didn't fix it then I'm really stumped.
 
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Good work!

I was just going to stop in and ask how things are going but you beat me to it. The helping hand and pcb holder is good thinking, you are going to love them. I have a Weller pcb holder and would never want to be without it now.

Hint for the future: The steel support rods in my holder are 12mm in diameter. The original ones were too short for some boards so I found some nice hardened steel 500mm long replacements on Amazon. Makes the tool modular and flexible.
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Cheers,
James
 
Bratwurst7s said:
Good work!

I was just going to stop in and ask how things are going but you beat me to it. The helping hand and pcb holder is good thinking, you are going to love them. I have a Weller pcb holder and would never want to be without it now.

Hint for the future: The steel support rods in my holder are 12mm in diameter. The original ones were too short for some boards so I found some nice hardened steel 500mm long replacements on Amazon. Makes the tool modular and flexible.
View attachment 3151515

Cheers,
Jame
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Working by candle light ? Or is that your dim bulb ? :rflmao:
 
avionic said:
Working by candle light ? Or is that your dim bulb ? :rflmao:
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In the summer of '22 when they said that power and heating costs were going to go up by obscene amounts I bought a bunch of candle lanterns and when winter came we started burning a lot of candles and kept the heat and lights turned pretty far down.

These big fat 90 hour candles put out a surprising amount of heat. And they give a nice warm light.

A lot of friends and neighbors thought that was pretty amusing and did a lot of laughing at me going back and living in the middle ages.

Until they all got a breathtaking power/heat surcharge at the end of the year. Like, an average of €1000. Wife and I were the only people in the building that got money back.
Then I got to start laughing.
:biggrin:

Cheers,
James

ps: I'm still searching for a 100W version to use as my dim-bulb-tester. Just haven't figured how to get it plugged in yet.
 
Bratwurst7s said:
For those times when you get tired of the simple, Flatland, Downstream single storey helping hands,

Behold! The double Franken-Hands of Doom!

Cheers,
James
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They look like they want to fight me! lol

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Just won this auction on eBay, it's a KA-3500. Seller says it works, just has scratchiness when changing volume... Been looking at the KA-3500 for a while as another easy resto project so hopefully this will be a fun one!
 
analogwisdom said:
They look like they want to fight me! lol

View attachment 3152598

Just won this auction on eBay, it's a KA-3500. Seller says it works, just has scratchiness when changing volume... Been looking at the KA-3500 for a while as another easy resto project so hopefully this will be a fun one!
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My good friend and fellow AK member morfeora has one of them, unrestored and needing it. If you do a thread on yours I am sure that he will be interested.
 
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Had an oopsie with a kitchen knife and my thumb tip while making birthday dinner for the fiancee... Cut a decent sized chunk off. Thankfully no stitches needed but it sure does hurt like a b@!$# and bled enough to make the kitchen look like a set for a cheesy 80s slasher flick.

Repairs postponed for a few days, lol
 
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