Difficulty

Moderate

Steps

5

Time Required

Suggest a time??

Sections

1

  • Front pushbutton
  • 5 steps

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Introduction

https://www.philips.de/c-p/BTM2310_12/mi…

What you need

Step 1

              Open
  • Remove screws

Remove screws

1024

Step 2

              Open
  • Open tray and unclip front of tray
  • There are two hooks and some glue
  • Close tray
  • Remove screws for front
  • Remove front

Open tray and unclip front of tray

There are two hooks and some glue

Close tray

Remove screws for front

Remove front

Step 3

              Remove PCB
  • Remove screws
  • Remove PCB from front

Remove PCB from front

Step 4

              Measure
  • This is the section of the pushbuttons. Each of them, when pressed, is shorting to ground one connection in a resistor chain. This basically is a variable resistor to the microcontroller on the other end of the ribbon cable. The microcontroller measures the resistance and decides which value means which keypress.
  • The problem comes when there is another resistance appearing due to dirt or other reasons. Then the whole circuit can behave as if random keys are pressed.
  • Remove ribbon cable
  • Measure resistance to ground at this point. Should be OL (open)
  • If not, measure resistance across pushbuttons. Search for lowest resistance. This is the place you want to replace the pushbutton
  • The resistances (in the circles) from left to right are 1k, 1k2, 1k8, 1k8, 2k7, 4k7

This is the section of the pushbuttons. Each of them, when pressed, is shorting to ground one connection in a resistor chain. This basically is a variable resistor to the microcontroller on the other end of the ribbon cable. The microcontroller measures the resistance and decides which value means which keypress.

The problem comes when there is another resistance appearing due to dirt or other reasons. Then the whole circuit can behave as if random keys are pressed.

Remove ribbon cable

Measure resistance to ground at this point. Should be OL (open)

If not, measure resistance across pushbuttons. Search for lowest resistance. This is the place you want to replace the pushbutton

The resistances (in the circles) from left to right are 1k, 1k2, 1k8, 1k8, 2k7, 4k7

Step 5

              Remove/replace/clean pushbutton
  • Remove pushbutton and either clean it, or replace it.
  • I did not find a way to open and reseal a button, so instead ordered replacement buttons. They are very cheap.

Remove pushbutton and either clean it, or replace it.

I did not find a way to open and reseal a button, so instead ordered replacement buttons. They are very cheap.

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

Cancel: I did not complete this guide.

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                    Thomas Widmaier

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