gcb-95 wah repair needed?

formerMember1 · July 23, 2005, 10:23:38 AM

hi,
A guy at a music store was going to modify my wah about a year ago. he changed that 33k resistor. Well when i unsoldered that resistor to try a different one, the two little circles on the board where the resistor solders to is missing. Like there is nothing to solder the resistor to. i was going to jumper the one end of resistor to the other part the trace comes from, but now the other end of resistor does't go anywhere. it is just soldred into the board.
Can i jumper the one end of resistor to other part? What do i do about the other end? The hole doesn't lead to anywhere?

What can i do to fix this? Does it mean i will have to get another board?
thanks :wink:

jimbob · July 23, 2005, 10:26:57 AM

I had this same problem when i 1st started..You just solder it to the other part..no biggie. and if you break/damage any others you can do the same- as though you were perfing it..

Paul Marossy · July 23, 2005, 10:40:19 AM

A great reason to carefully use desoldering braid for removing components like that...

jimbob · July 23, 2005, 10:57:37 AM

esp w dunlop boards!

formerMember1 · July 23, 2005, 10:58:02 AM

i always use a bulb solder sucker. i could never get the braid to work. It always get's stuck to the board and causes a mess. Is it because i got the cheap braid from Radio shack?

and what should i do with the other end of resistor. the is no trace going to it. that end was just soldered to the board.
\
thanks

Paul Marossy · July 23, 2005, 11:18:11 AM

Quote from: formerMember1i always use a bulb solder sucker. i could never get the braid to work. It always get's stuck to the board and causes a mess. Is it because i got the cheap braid from Radio shack?

and what should i do with the other end of resistor. the is no trace going to it. that end was just soldered to the board.
\
thanks

I use the RadioShack desoldering braid all the time, it works great for me. It just takes a little bit of practice to use well. It sounds like your soldering iron isn't quite hot enough to use the desoldering braid effectively. What is the wattage rating of your soldering iron? (Or maybe you don't apply the heat for long enough?)

On the resistor, I guess just solder it to the board like it was before.

BTW, I have modded my GCB95, and I didn't have any problems with the pads lifting off. I used my trusty RadioShack delsodering braid, too. :wink:
That's not to say that those boards aren't delicate. They are just about as bad as working on the new Fender amp PCBs. :shock:

formerMember1 · July 23, 2005, 11:24:29 AM

well i have a weller soldering station that goes from 5 to 40 watts.

it wasn't myfault that the traces came up, when i took the resistor out if literally fell out, they had huge globs of solder just holding it there. i think they overheated the traces and they came off. and they had to glob the solder on thick or something,

QuoteOn the resistor, I guess just solder it to the board like it was before.

but there is nothing for that end to solder too. there are no traces or "paths" leading to that hole and there is no little silver circle to solder it to. it is just like a hole in the board

thnaks

jimbob · July 23, 2005, 11:31:52 AM

It took a little while for me to get used to the RS braid but i really like it! Its really usefull when working on delicate boards ect.. Expensive though..at least i think so. I remember having that same wah and the pads lifted real easy. Your better of making another board or buying one and populate it.

Smokin Tone · July 23, 2005, 06:23:53 PM

Here is the schematic for the GCB-95.

http://www.geocities.com/j4_student/crybaby95.gif

Solder the resistor to the correct components or use jumpers to make the connections. Should work as good as before (or maybe better).

Paul Marossy · July 24, 2005, 12:24:56 AM

Quotei think they overheated the traces and they came off. and they had to glob the solder on thick or something

Yeah, probably so. Some of these "tech guys" are real hackers, if you know what I mean. Anyhow, I guess you'll have to use jumpers or the component leads to make the necessary connections.

guitarmonky55 · July 24, 2005, 12:56:19 AM

i made the mistake of trying to change out that very resistor as my first dive into soldering, diy fx, and work with circuit boards. i actually had to double check whether resistors had a specific orientation when i did it :oops: :oops:

anyway one end of the pad lifted off. luckily i managed ot keep it from actually breaking, when i put the new resistor in i just gently eased it back into place with the soldering iron and globbed up to keep it there. but the morla of this story is that those boards are really fragile!

Paul Marossy · July 24, 2005, 01:11:29 AM

Quote from: guitarmonky55i made the mistake of trying to change out that very resistor as my first dive into soldering, diy fx, and work with circuit boards. i actually had to double check whether resistors had a specific orientation when i did it :oops: :oops:

anyway one end of the pad lifted off. luckily i managed ot keep it from actually breaking, when i put the new resistor in i just gently eased it back into place with the soldering iron and globbed up to keep it there. but the morla of this story is that those boards are really fragile!

I was able to switch out that resistor in my own GCB95 without pulling up the pads. Lucky I guess. :?

formerMember1 · July 24, 2005, 09:41:44 AM

yeah i jumpered traces and that worked. now the other resistor i removed lifted the trace but didn't come off. jeeze louise :lol:

Dai H. · July 24, 2005, 09:43:14 AM

Quote from: Paul Marossy
Quote from: guitarmonky55i made the mistake of trying to change out that very resistor as my first dive into soldering, diy fx, and work with circuit boards. i actually had to double check whether resistors had a specific orientation when i did it :oops: :oops:

anyway one end of the pad lifted off. luckily i managed ot keep it from actually breaking, when i put the new resistor in i just gently eased it back into place with the soldering iron and globbed up to keep it there. but the morla of this story is that those boards are really fragile!

I was able to switch out that resistor in my own GCB95 without pulling up the pads. Lucky I guess. :?

right, too much heat for too long leads to lifted pads and traces. You need to be very quick.

Paul Marossy · July 24, 2005, 08:18:53 PM

Quotetoo much heat for too long leads to lifted pads and traces. You need to be very quick.

Yeah, sometimes it happens no matter how careful you are. :x
For the really pesky desoldering jobs, I desolder a little bit at a time and let it cool down for a little while in between each try. Sometimes I have to kind of just push the component lead with the soldering iron and then wiggle it until it cools off so it doesn't keep sticking to the pad due to the small amount of solder that is left on the pad which doesn't want to come off for nothing. It's a delicate process most of the time. :wink:

Dai H. · July 24, 2005, 11:17:47 PM

yep, same for me. It can take a lot of patience sometimes. You have to be careful not to be too impatient and end up overheating then lifting pads and traces. On a GCB board, I bet I could unsolder and solder parts on/off many times w/out damaging the board. This is not a boast but just to say that w/good technique, it can be done. I've used tons of braid, and I find it's quite easy to use. One thing, is to watch out for old oxidized braid. In that condition, it won't work. I think most people when trained will be able to solder competently, but at the same time it can be somewhat of an intricate process.

Paul Marossy · July 25, 2005, 10:16:53 AM

QuoteOn a GCB board, I bet I could unsolder and solder parts on/off many times w/out damaging the board. This is not a boast but just to say that w/good technique, it can be done.

Same here. I've modded my Fender Hot Rod DeVille several times and changed out the same caps at least four times (not counting removing the originals), and didn't damage the PCB. The PCB is rather delicate, too. :wink:

formerMember1 · July 25, 2005, 05:07:30 PM

i dont know, for me the braid never cuts it. I am not that new to soldering, i built great high quailty guitars. I tried the braid again but for some reason the solder underneath the braid melts and is really hot. But the braid doesn't pick it up. I do notice the braid is about 2 years old and it doesn't have a coppper color. It looks more greenish.

i will pick up some more new braid.

Paul Marossy · July 25, 2005, 05:16:59 PM

Quote from: formerMember1i dont know, for me the braid never cuts it. I am not that new to soldering, i built great high quailty guitars. I tried the braid again but for some reason the solder underneath the braid melts and is really hot. But the braid doesn't pick it up. I do notice the braid is about 2 years old and it doesn't have a coppper color. It looks more greenish.

i will pick up some more new braid.

It sounds like it's oxidized, so it is preventing it from working as it should be...

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gcb-95 wah repair needed?

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