Danger
Potentially Dangerous
Injury may result if this procedure is not followed properly. Use caution and follow all warnings.
Danger

Introduction

The power PCB is attached to the inside of the back panel and provides access to the power inputs from the exterior of the speaker. This PCB transforms the incoming power to appropriate level for use by the other PCB's in the B212D speaker.

Image 1/1: Remove the 8 Phillips screws from the back of the speaker.
  • Unplug your speaker from the power outlet.

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

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Image 1/1: To avoid damaging your speaker, remove slowly, as there is still a wire attached from the electronics box to the speaker.
  • 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.

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Image 1/3: 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. Image 2/3: You should have removed a total of '''7 machine screws''' and '''2 washers'''. Image 3/3: 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.
  • 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.

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Image 1/1:
  • Remove the portion of the metal housing that you freed with the 7 screws in the previous step.

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Image 1/3: 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. Image 2/3: Snake the clip head through the hole in the metal electronics box casing. Image 3/3: 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.

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Image 1/2: Image 2/2:
  • Remove the 4, 7/32" long machine screws with a #2 phillips head screwdriver.

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Image 1/2: Remove the wires to you can fully remove the back panel. Image 2/2: Remove the wires to you can fully remove the back panel.
  • 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.

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Image 1/3: Remove the box containing the power PCB. Image 2/3: Remove the box containing the power PCB. Image 3/3: Remove the box containing the power PCB.
  • Remove the 4 indicated 7/32" long machine screws with a #1 phillips head screwdriver.

  • Remove the box containing the power PCB.

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Image 1/2: Remove the power PCB. Image 2/2: Remove the power PCB.
  • There are 4 remaining 7/32" long machine screws holding the power PCB to the box which contains it; remove these with a #1 phillips head screwdriver.

  • Remove the power PCB.

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Conclusion

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

gameslammer7

Member since: 03/29/2012

816 Reputation

6 Guides authored

4 Comments

This PCB does not convert electricity, and is rarely what fails. AC leaves this board and gets converted to DC at the rectifier bridge, which is part of the main amp PCB. This main amp board is where 99.9% of issues arise...

Gabriel Talamantes - Reply

Do you know where I can find replacement boards for this speaker? It takes about 20 times of cycling the power button for it to finally come on. Can't seem to find parts anywhere. May not be financially smart to replace the board, but if it's not that expensive, I feel it's worth it.

Justin -

Hi. Why dont you fix the board?

riaandd - Reply

Has anyone got a circuit diagram for the power board. Is it a switch mode power supply - the power plug indicates 240V or 110 V AC which would normally indicate it uses a switch mode power supply at the front end

Jonathon - Reply

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