Nick Danger's Yamaha M80 Amplifier Repair/ Restoration

[avionic]

I find a flat bladed exacto knife, like a chisel tip works great for scraping the glue remnants off the PCB.

 

[brutal]

I find a flat bladed exacto knife, like a chisel tip works great for scraping the glue remnants off the PCB.

I thought you stripped the PCB completely and used your 30 ton press?

 

[laatsch55]

Well, there's an idea....

 

[Nick Danger]

Checkin' in, boys. Been a loooooong week for me and I have not been able to get any progress completed on the M80 as of late, but I hope to have the board cleaned up a bit and the bus bars looking pretty by Sunday. The autos need a little attention the next couple of day and then I hope to get a bit more work done on the Yammie.

Then the real crying can begin.........

 

[avionic]

I thought you stripped the PCB completely and used your 30 ton press?

Pfffff 30 ton is for kids.

 

[laatsch55]

Got a 500 ton horizontal if needed...

 

[Nick Danger]

Bus Bars

Got the bus bars looking a little bit better:

Going to start cleaning up the boards a bit more tomorrow and hope to know what components I will need to aquire for this repair.

 

[NavLinear]

Those came out looking really nice. What did you use to get them looking this good?

 

[Nick Danger]

Cheers. I ended up using Hope's copper cleaner/ polish that was applied with my Dremel and a polishing wheel. It's crazy how nasty that glue becomes. The corrosion actually etched the copper a tiny bit.

 

[Nick Danger]

Jumper Question?

Do you folks make your own wire jumpers or do you buy them from one of the electronics suppliers?

 

[NavLinear]

Do you folks make your own wire jumpers or do you buy them from one of the electronics suppliers?

You can make your own depending on what type of jumper you're referring to. If it is a jumper on a circuit board you can use bus wire with Teflon sleeving or bus wire that comes with insulation from the manufacture. The gauge is dependent on what you intend to jumper.

 

[avionic]

Do you folks make your own wire jumpers or do you buy them from one of the electronics suppliers?

A while back I picked up a resistor "grab bag" on ebay for a couple dollars. Thats what I use for jumper wires. I just snip the leads off the resistors.Use the leads and shit can the 50megΩ resistor.

 

[Nick Danger]

You can make your own depending on what type of jumper you're referring to. If it is a jumper on a circuit board you can use bus wire with Teflon sleeving or bus wire that comes with insulation from the manufacture. The gauge is dependent on what you intend to jumper.

A while back I picked up a resistor "grab bag" on ebay for a couple dollars. Thats what I use for jumper wires. I just snip the leads off the resistors.Use the leads and shit can the 50megΩ resistor.

Thanks for the info, gents. Looks like there are 2- 3 at first glance that are corroded badly and need to be replaced.

 

[brutal]

A while back I picked up a resistor "grab bag" on ebay for a couple dollars. Thats what I use for jumper wires. I just snip the leads off the resistors.Use the leads and shit can the 50megΩ resistor.

This.

Actually, I generally save the cap leads after installing them and use them for jumpers as needed.

 

[Nick Danger]

This.

Actually, I generally save the cap leads after installing them and use them for jumpers as needed.

Brilliant, brutal! Should have affected components removed and board cleaned by this afternoon.

 

[Nick Danger]

Going smoothly until Murphy showed up.

Affected components have been removed and glue cleaned from top of board. Lots of chipping, picking and tweezing:

Flux cleaned off backs of most of the boards:

All parts neatly arranged on sheet of paper with locations labeled for easy replacement and then about a 25 MPH gust of wind came along.......

Uncontrollable sobbing to begin in 3, 2, 1......... Time to sit back before I do something rash.

 

[Nick Danger]

Tragedy averted! Referred to some before pics and I think I have everything back in their appropriate piles again. I think......

Any thoughts on the part number of this?:

I am coming up with A180J, yes, no?

 

[avionic]

18 picofarad +/- 5 % tolerance

180----capacitance
J------ tolerance



http://www.electronics2000.co.uk/calc/capacitor-code-calculator.php


http://www.mouser.com/ProductDetail...inVFKM98vCmggniHpDuVtAtJd01FxsXqasV82tHH55A==

 

[avionic]

Now you need to make the rest of the main board as clean as the area you removed the glue from. Get busy !

 

[Gepetto]

18 picofarad +/- 5 % tolerance

180----capacitance
J------ tolerance



http://www.electronics2000.co.uk/calc/capacitor-code-calculator.php


http://www.mouser.com/ProductDetail...inVFKM98vCmggniHpDuVtAtJd01FxsXqasV82tHH55A==

Recommend you measure it as it can also be 180 pF 5% The capacitor manufacturers are quite inconsistent in their marking of capacitors. It could be either 18 or 180