Yamaha CA-800 Channel Out.

[avionic]

TR709----
Collector to R720 .. Emitter to D710 cathode.

 

[HomerJSimpson]

Great one of the blue wires broke off and I don't know where it goes

 

[mbz]

Looking at the icon and comparing it to the t existing c458's it may be in incorrectly

. Should be correct board version, see TR709 orientation versus yours

 

[HomerJSimpson]

See pic

 

[HomerJSimpson]

TR709----
Collector to R720 .. Emitter to D710 cathode.

It's definitely in wrong, but can't do nothing thill figure out where to solder the blue wire!

 

[avionic]

 

[HomerJSimpson]

Exactly

 

[HomerJSimpson]

I'll see if I can find a pic online to compare to.

 

[mbz]

See pic below, check tab highlighted for broken wire. Tab should be marked BE(Blue)

 

[avionic]

One blue wire goes to ground and the other to FR705.

 

[HomerJSimpson]

See pic below, check tab highlighted for broken wire. Tab should be marked BE(Blue)
View attachment 1875131

That's what I thought but there is a gray wire there too

 

[avionic]

That's what I thought but there is a gray wire there too

Yep. Thats the ground connection.

 

[HomerJSimpson]

One blue wire goes to ground and the other to FR705.

Got it

 

[HomerJSimpson]

I put the transistor in what I think is correctly, and no relay click on dbt.

 

[HomerJSimpson]

I put the transistor in what I think is correctly, and no relay click on dbt.

Maybe I fried it having it in the wrong way?

 

[avionic]

Maybe I fried it having it in the wrong way?

Maybe..I'm not holding my breath.

 

[HomerJSimpson]

Maybe..I'm not holding my breath.

Me either lol

 

[HomerJSimpson]

Well I put a new one in and no relay click

 

[HomerJSimpson]

What voltage are you seeing at each end of R721 ?

22 and 3.8

 

[mbz]

Back to basics, check for excessive Vdc at R and L as below