Concert question.

[tribi9]

Hello guys, just wondering if anybody could help me out. I got an 80's Fender Concert.

I got a loose wire that Im not sure where it should go. It is the green wire in the pic. it goes to a funky blue not sure if it is a cap or resistor that goes to a cap resistor junction that ends up on pin 3 on V4. I first I thought it was a ground but when I grounded the wire, I lost maybe 90% of the output on my amp.

I looked at the schematic but I couldn't figure it out. Cheers and thx.

[IMG:800:600]http://i114.photobucket.com/albums/n271 ... 160320.jpg[/img]


http://ampwares.com/schematics/concert_ii_83.pdf


Cheers

[tribi9]

I had added some dots to highlight the location, but I don't think they really showing up. Sorry the text on my first post is a little confusing. The loose green wire that I'm talking about you can see it near the input jack. That goes to a funky blue cap then to a cap/junction resistor that goes to pin 3 on V4. Hope that is a little easier to understand.
cheers

[Tillydog]

Is the funky blue an 0.1uF cap?

If so, I think it's the 0.1uF to ground just below the two diodes on the top left of the schematic. The green wire is something to do with the channel switching, and I think is the connection between the 0.1uF cap/diode and the top jack on the schematic ("Jack 2").

The other end of funky blue and the 1k5 / (25uF ??) cap junction is a ground.

It would be a damn sight easier if people put component ids on schematics!

Can't tell for sure, but hopefully you can trace it out (or not) from there.

Andy

[martin manning]

Second input jack, top "inner" lug, looks like.

[tribi9]

Thank you Martin. I love this place.

That would be a ground tho, right? When I grounded the wire, I lost a lot of volume. Sound dropped by around 80%.

[martin manning]

It's an isolated "break" switching contact in the jack, part of the channel switching circuits. I'd hook it up and see what happens, with a signal plugged into input 1 and then input 2. It is possible that someone disconnected it on purpose?

[tribi9]

Input 2 is completely disconnected. What I'm going to do is wire it back the same way they pic shows. I don't have one of those jacks handy, so I'll have to do it tomorrow.

Thx guys.

[tribi9]

Thx guys, I did have a jack handy. I wired it as per the picture and now both inputs are working fine. Time to button it up and play loud.

Once again you guys have saved me.

[Structo]

Cool!

Another satisfied customer.