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  1. Philips BTM 2310/12  CD tray randomly opens / closes, Open: 手順 1、 3の画像 1 Philips BTM 2310/12  CD tray randomly opens / closes, Open: 手順 1、 3の画像 2 Philips BTM 2310/12  CD tray randomly opens / closes, Open: 手順 1、 3の画像 3
    • Remove screws

  2. Philips BTM 2310/12  CD tray randomly opens / closes, Open: 手順 2、 3の画像 1 Philips BTM 2310/12  CD tray randomly opens / closes, Open: 手順 2、 3の画像 2 Philips BTM 2310/12  CD tray randomly opens / closes, Open: 手順 2、 3の画像 3
    • Open tray and unclip front of tray

    • There are two hooks and some glue

    • Close tray

    • Remove screws for front

    • Remove front

  3. Philips BTM 2310/12  CD tray randomly opens / closes, Remove PCB: 手順 3、 1の画像 1
    • Remove screws

    • Remove PCB from front

  4. Philips BTM 2310/12  CD tray randomly opens / closes, Measure: 手順 4、 3の画像 1 Philips BTM 2310/12  CD tray randomly opens / closes, Measure: 手順 4、 3の画像 2 Philips BTM 2310/12  CD tray randomly opens / closes, Measure: 手順 4、 3の画像 3
    • 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

  5. Philips BTM 2310/12  CD tray randomly opens / closes, Remove/replace/clean pushbutton: 手順 5、 1の画像 1
    • 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.

終わりに

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

Thomas Widmaier

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