Marshall Ms 2 Micro Amp Circuit Board Disassembly Repair Guide

Difficulty

Moderate

Steps

Time Required

                          20 - 30 minutes

Sections

Disassembling Marshall MS-2 Micro Amp Case Disassembly
4 steps
Marshall MS-2 Micro Amp Circuit Board Disassembly
3 steps

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Introduction

Your device may have a damaged circuit board if it smells of smoke, or as if something is burning. Another sign of possible circuit board damage is if the volume, tone, and/ or power knobs do not work. For help with common problems, check the MS-2 Troubleshooting Page.

Circuit boards are important because they serve as the central source for all electronic components within the device. A Marshall MS-2 Micro Amp can be damaged if the amp is exposed to environmental conditions such as heat, dust, or moisture. It can also be damaged a by power overload or surge, or if the device is dropped.

The following guide shows how to turn the Marshall MS-2 Micro Amp off, how to remove its battery, and how to take off the back panel of the amp to access the circuit board. Steps 1-4 are also found in the Disassembling Marshall MS-2 Micro Amp Case Disassembly guide also found here. Steps 5-7 give a description of how to properly remove the volume, tone, and power knobs, and finally how to remove the circuit board itself. Please use caution not to touch any of the wires.

What you need

Step 1

              Disassembling Marshall MS-2 Micro Amp Case Disassembly

First be sure to turn the power switch to the off position.
Do this by turning the leftmost knob counter-clockwise as until the line points to “off.”

First be sure to turn the power switch to the off position.

Do this by turning the leftmost knob counter-clockwise as until the line points to “off.”

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Step 2

Now remove the battery.
On the back of the device locate the battery cover.
Remove it by pushing down on the clip.
Then pull the piece of fabric until the battery comes out.

Now remove the battery.

On the back of the device locate the battery cover.

Remove it by pushing down on the clip.

Then pull the piece of fabric until the battery comes out.

Step 3

Use the long, skinny phillips head screwdriver to remove the 4 7/16" screws on the back of the device in the four corners.
Once unscrewed, do not try to take each screw out. Move to next step once all screwed have been unscrewed.

Use the long, skinny phillips head screwdriver to remove the 4 7/16" screws on the back of the device in the four corners.

Once unscrewed, do not try to take each screw out. Move to next step once all screwed have been unscrewed.

Step 4

Now pull the back panel off and place it down as shown. Pull the panel straight up so you do not lose the screws.

Now pull the back panel off and place it down as shown. Pull the panel straight up so you do not lose the screws.

Step 5

              Marshall MS-2 Micro Amp Circuit Board Disassembly

Remove the volume, tone and power knobs by pulling them straight away from the front of the device. If they do not come off easily use the wedge tool to pry them up.

Remove the volume, tone and power knobs by pulling them straight away from the front of the device. If they do not come off easily use the wedge tool to pry them up.

Step 6

Use a 10mm socket to remove the nuts from the volume and tone potentiometers.
Use a 11mm socket on the power switch nuts.
Use a 9/16" socket to remove the nut from the input jack.
Take care when you remove the nuts to not lose the washers.

Use a 10mm socket to remove the nuts from the volume and tone potentiometers.

Use a 11mm socket on the power switch nuts.

Use a 9/16" socket to remove the nut from the input jack.

Take care when you remove the nuts to not lose the washers.

Step 7

Now you must remove the LED from the circuit board.
To do this you will need to use a soldering iron to detach to two pins of the LED from the board. They are the two pins in the lowest leftmost corner of the board.
Be careful to not touch any of the wires with the soldering iron. It might be helpful to remove those with the iron first to get them out of the way.
If you haven’t soldered before check out this guide.
Once detached, pull the board straight up to remove.

Now you must remove the LED from the circuit board.

To do this you will need to use a soldering iron to detach to two pins of the LED from the board. They are the two pins in the lowest leftmost corner of the board.

Be careful to not touch any of the wires with the soldering iron. It might be helpful to remove those with the iron first to get them out of the way.

If you haven’t soldered before check out this guide.

Once detached, pull the board straight up to remove.

To reassemble your device, follow these instructions in reverse order.

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                    MacKinley

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                       University of Maryland, Team 1-1, Shastany Fall 2013                        

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Introduction

What you need

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