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Introduction

The control PCB is attached to the inside of the back panel, and provides access to adjustment knobs and inputs and outputs for the B212D speaker.

Pièces

Aucune pièce spécifiée.

  1. CAUTION: Unplug your speaker from the power outlet.
    • CAUTION: Unplug your speaker from the power outlet.

    • Remove the 8 Phillips screws from the back of the speaker.

  2. Carefully remove the back panel, lifting out the metal electronics-box with it.
    • Carefully remove the back panel, lifting out the metal electronics-box with it.

    • To avoid damaging your speaker, remove slowly, as there is still a wire attached from the electronics box to the speaker.

  3. There are two silver, 6 mm-long machine screws with two 1/8" inner-diameter washers on the exterior of the metal electronics box; remove these first using a #2 philips screwdriver. There are five of the same type of machine screw (silver, 6 mm-long) remaining around the metal electronics box's exterior; remove these as well. You should have removed a total of 7 machine screws and 2 washers.
    • There are two silver, 6 mm-long machine screws with two 1/8" inner-diameter washers on the exterior of the metal electronics box; remove these first using a #2 philips screwdriver.

    • There are five of the same type of machine screw (silver, 6 mm-long) remaining around the metal electronics box's exterior; remove these as well.

    • You should have removed a total of 7 machine screws and 2 washers.

    • The reason for removing the two screws with the two washers first (or replacing them last when reassembling) is that their holes are actually slots. They are designed as slots to accommodate slop in the assembly, and if unscrewed out of order, you may have difficulty while removing - or possibly even damage - the other five screws.

  4. Remove the portion of the metal housing that you freed with the 7 screws in the previous step.
    • Remove the portion of the metal housing that you freed with the 7 screws in the previous step.

  5. Inside the metal electronics box housing is a white clip attached to a small PCB; remove this. The white clip in this image has been glued, indicating that the manufacturer may not expect  the end user to remove this clip; it is difficult to proceed with the disassembling without doing so, however, because the rest of the speaker does not provide a sufficient surface on which to work. Snake the clip head through the hole in the metal electronics box casing.
    • Inside the metal electronics box housing is a white clip attached to a small PCB; remove this.

    • The white clip in this image has been glued, indicating that the manufacturer may not expect the end user to remove this clip; it is difficult to proceed with the disassembling without doing so, however, because the rest of the speaker does not provide a sufficient surface on which to work.

    • Snake the clip head through the hole in the metal electronics box casing.

  6. Batteries pour ordinateurs portables

    Une réparation facile pour un gain en puissance max.

    Acheter maintenant

    Batteries pour ordinateurs portables

    Une réparation facile pour un gain en puissance max.

    Acheter maintenant
  7. Remove the 4, 7/32" long machine screws with a #2 phillips head screwdriver. Remove the 4, 7/32" long machine screws with a #2 phillips head screwdriver.
    • Remove the 4, 7/32" long machine screws with a #2 phillips head screwdriver.

  8. Caution: The circuit board contains many capacitors that could cause serious injury if touched. If possible, use a capacitor discharge probe to safely rid the capacitors of dangerous charges. Rotate the back panel so you can view the interior; note the three wires attached.
    • Caution: The circuit board contains many capacitors that could cause serious injury if touched. If possible, use a capacitor discharge probe to safely rid the capacitors of dangerous charges.

    • Rotate the back panel so you can view the interior; note the three wires attached.

    • Remove the wires to you can fully remove the back panel.

  9. Remove the 4 indicated 9/32" long screws with the #1 phillips head screwdriver
    • Remove the 4 indicated 9/32" long screws with the #1 phillips head screwdriver

  10. Remove the plastic cover.
    • Remove the plastic cover.

  11. Remove all three of the knobs by pulling them straight up.
    • Remove all three of the knobs by pulling them straight up.

  12. Remove the 4 indicated 9/32" long screws using a #1 phillips head screwdriver.
    • Remove the 4 indicated 9/32" long screws using a #1 phillips head screwdriver.

  13. Remove the 2 indicated 3/16" long machine screws with a #1 phillips head screwdriver.
    • Remove the 2 indicated 3/16" long machine screws with a #1 phillips head screwdriver.

  14. The control PCB is free now, ready to be removed from the speaker's back panel.
    • The control PCB is free now, ready to be removed from the speaker's back panel.

Conclusion

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

Une autre personne a terminé cette réparation.

gameslammer7

Membre depuis le 29/03/2012

897 Réputation

6 tutoriels rédigés

In Step 3 there are 2 more screws, along the side of the 'electronics box’.

The washer and nut securing the 1/4” socket also need to be removed.

plasticmojo - Réponse

Where do I find a replacement control PCB for my B212A??

jcard2002 - Réponse

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