Boss Chromatic Tuner Tu 2 Fix Battery Connection Repair Guide

Difficulty

Difficult

Steps

Time Required

                          10 - 30 minutes

Sections

Fix battery connection
8 steps

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BackBoss Chromatic Tuner TU-2
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Introduction

The guide is marked as difficult because it requires soldering, but it’s just a simple soldering job, other than that assembling and disassembling is easy and straightforward.

Step 1

              Reproducing the problem

With the 9V DC input connected, the unit switches on correctly
When on batteries, the pedal will not work unless a jack is plugged into the input (for battery saving). However, in this case the unit won’t work.
Note that instead of a 9V battery I’m using alligator clips to connect the battery connector to my DC power source at 9V, which does the same.

With the 9V DC input connected, the unit switches on correctly

When on batteries, the pedal will not work unless a jack is plugged into the input (for battery saving). However, in this case the unit won’t work.

Note that instead of a 9V battery I’m using alligator clips to connect the battery connector to my DC power source at 9V, which does the same.

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Step 2

              Opening the pedal

Turn the pedal upside down and remove the 4 screws in the corners with a regular Phillips screwdriver

Turn the pedal upside down and remove the 4 screws in the corners with a regular Phillips screwdriver

Step 3

              Access the PCB

Remove the plastic lid and lift the circuit board. There are no delicate connections but there are cables connecting it to the other PCB, so don’t pull too hard and don’t separate them completely.

Remove the plastic lid and lift the circuit board. There are no delicate connections but there are cables connecting it to the other PCB, so don’t pull too hard and don’t separate them completely.

Step 4

              Test the cable connections

From the battery connection, test continuity with a multimeter to where the cable is soldered to the PCB, input connector, etc…
For me, all of these connections worked fine

From the battery connection, test continuity with a multimeter to where the cable is soldered to the PCB, input connector, etc…

For me, all of these connections worked fine

Step 5

              Test the PCB traces

Starting where the cable is soldered to the PCB, follow the traces checking for continuity.
In my case I found one that was not connected, I cleaned it with a bit of isopropyl alcohol, and looked with a magnifying glass to reveal what looks like a crack on the trace.

Starting where the cable is soldered to the PCB, follow the traces checking for continuity.

In my case I found one that was not connected, I cleaned it with a bit of isopropyl alcohol, and looked with a magnifying glass to reveal what looks like a crack on the trace.

Step 6

              Short the contact pads

Solder a thin piece of solid wire between the two contact pads that should be in touch by the trace

Solder a thin piece of solid wire between the two contact pads that should be in touch by the trace

Step 7

              Check the soldering

Test for continuity between the two pads that have been joined
Make sure no other contacts have been affected by the soldering

Test for continuity between the two pads that have been joined

Make sure no other contacts have been affected by the soldering

Step 8

              Test the battery connection

Insert a battery (I’m still using my DC power source) and check that the unit powers up
Don’t forget to add a jack to the input or the unit won’t power up on batteries

Insert a battery (I’m still using my DC power source) and check that the unit powers up

Don’t forget to add a jack to the input or the unit won’t power up on batteries

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

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Author

                                      with 1 other contributor

                    palako

Member since: 02/01/2015

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Member-Contributed Guide#

Introduction#

Member-Contributed Guide

Introduction