This Fender guitar amplifier was made around 2007. It is a modern guitar amp with a Printed Circuit Board, just like a computer (yuck...)
Anyway, a very ambitious rockstar friend of mine got excited and turned the volume pot past it's maximum and it broke. Upon examination, I realized that it just needed to have the pot replaced. I visited several electronics websites and ordered the wrong part several times. Finally, I just caved and ordered the official Fender replacement part ($17.00 on ebay!!! DANG!)
For this instructable, the supplies needed were:
Screw driver (phillips)
Screw driver (flat-head)
Weller Soldering Iron
Step 1: DO NOT TRY TO FIX YOUR OWN AMP UNLESS YOU KNOW WHAT YOU ARE DOING!!!
DO NOT EVER ATTEMPT TO REPAIR YOUR OWN AMP WITHOUT CONSULTING SOMEONE WHO KNOWS WHAT THEY ARE DOING.
That said, Lets continue...
Step 2: Expose the Guts
Step 3: Access the Motherboard From the Back
The real issue with working on a modern amp is that like this fine example, all of the components are soldered right to the board. This means that to get at the underside of the board, all of the knobs and jacks must be unfastened from the chassis in order to move the board.
So, Off come the knobs, washers, everything holding the board to the chassis.
I used a tupperware dish to keep all the bits in so that I don't lose anything. It's disastrous to lose one little screw and not be able to put the amp back together!
Step 4: Remove the Old Part
Using the soldering iron, I heated the joints where the pot was attached to the board, and sucked the solder out with the sucker.
Step 5: Insert the New Part and Solder
I used the soldering iron to insert the new part. Make sure to heat the thing you are soldering (not the solder itself) so that you get a good joint.
AUDIO NERD ALERT
Quick bit about pots:
They are primarily either linear taper or logarithmic taper. This means that the rate in which they increase resistance is either linear, or exponential.
Logarithmic pots are used where volume control is necessary. This is because of a complex audio property involving decibels and I don't pretend to fully understand it, however the basics are that human ears percieve audio logarithmically.
Linear taper pots are often used in non-volume applications where a steady decrease in power is needed. Think light dimmer.
Since this was a volume pot, I went with Logarithmic taper.