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Alvarez S408 manual

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Table of contents for the manual

  • Page 1

    1 S408 REPAIR MANUAL S408 REPAIR MANUAL[...]

  • Page 2

    2 These instructions are intended to help restore any ailing S408 Passive Loudspeaker back to factory working conditions. They show how to remove and replace the drivers. Please contact Mackie Technical Support (1-800-898-3211) to receive a Service Request Number and Order Number for parts needed for this restoration. They will also help you determ[...]

  • Page 3

    3 Top left woofer replacement: 1 1 Six screws need to be removed from each side of the front of the grill (twelve screws total) using the phillips head screwdriver. This grill has a tendency to want to “pop” off, so please be sure to hold it in place with one hand or arm while removing the screws with your free hand. In addition to the grill, t[...]

  • Page 4

    4 3 3 Carefully begin to remove the woofer. Caution: The woofer is approximately 8 pounds with the weight unevenly distributed. Top left woofer replacement continued: 4 4 The positive (blue and black) and negative (solid black) cables are still attached to the woofer terminals. Remove the cables from their terminals simply by pushing down on the te[...]

  • Page 5

    5 Top right woofer replacement: 2 2 Eight screws need to be removed from the woofer using the phillips head screwdriver. Once the screws are removed, the woofer may be loosened by prying a fl at head screwdriver in between the cabinet and the woofer; a good place to start is in the notches located just above the horn assembly and below the woofer [...]

  • Page 6

    6 3 3 Carefully begin to remove the woofer. Caution: The woofer is approximately 8 pounds with the weight unevenly distributed. Top right woofer replacement continued: 4 4 The positive (blue and black) and negative (solid black) cables are still attached to the woofer terminals. Remove the cables from their terminals simply by pushing down on the t[...]

  • Page 7

    7 Bottom left woofer replacement: 2 2 Eight screws need to be removed from the woofer using the phillips head screwdriver. Once the screws are removed, the woofer may be loosened by prying a fl at head screwdriver in between the cabinet and the woofer; a good place to start is in the notches located just below the horn assembly and above the woofe[...]

  • Page 8

    8 3 3 Carefully begin to remove the woofer. Caution: The woofer is approximately 8 pounds with the weight unevenly distributed. Bottom left woofer replacement continued: 4 4 The positive (blue and black) and negative (solid black) cables are still attached to the woofer terminals. Remove the cables from their terminals simply by pushing down on the[...]

  • Page 9

    9 Bottom right woofer replacement: 2 2 Eight screws need to be removed from the woofer using the phillips head screwdriver. Once the screws are removed, the woofer may be loosened by prying a fl at head screwdriver in between the cabinet and the woofer; a good place to start is in the notches located just below the horn assembly and above the woof[...]

  • Page 10

    10 3 3 Carefully begin to remove the woofer. Caution: The woofer is approximately 8 pounds with the weight unevenly distributed. Bottom right woofer replacement continued: 4 4 The positive (blue and black) and negative (solid black) cables are still attached to the woofer terminals. Remove the cables from their terminals simply by pushing down on t[...]

  • Page 11

    11 High Frequency Driver replacement: 8 8 1 1 2 2 3 3 4 4 5 5 6 6 7 7 9 9 10 10 11 11 12 12 2 2 Twelve screws and fl at washers need to be removed from the horn assembly using the phillips head screwdriver. Once the screws are removed, the horn assembly may be loosened by prying a fl at head screwdriver in between the cabinet and the horn assembl[...]

  • Page 12

    12 3 3 Carefully begin to remove the entire horn assembly (with the high frequency driver still attached). Caution: The horn weighs about 8 pounds, and the weight is unevenly distributed. High Frequency Driver replacement continued: 4 4 The positive (red and black) and negative (solid black) cables are still attached to the high frequency driver te[...]

  • Page 13

    13 High Frequency Driver replacement continued: 6 6 Four bolts and eight washers may be removed from the driver using the 8mm combination wrench. Turn counter- clockwise to loosen and remove, clockwise to tighten. The other three are located around the horn assembly. Notice that the fl at washer is on the bottom, followed by the locking washer, an[...]

  • Page 14

    14 3 3 The horn assembly is shown above with the high frequency driver circled. Four screws need to be removed from the driver using the 3mm allen wrench. 4 4 Keep the four screws in a safe place. 5 5 The diaphragm and plate adapter are easily removed from the horn assembly. Notice the terminal locations in relation to the indents of the high frequ[...]

  • Page 15

    15 7 7 This is what the plate adapter (left) and diaphragm (right) both look like. Place the new diaphragm (part # coming soon) where the old one was. Follow the same steps as above, but backwards 6 to 1. Power up the S408 and the new diaphragm should now be pumping out those highs again. Sweet, you just replaced a diaphragm! Diaphragm replacement [...]

  • Page 16

    16 Input assembly replacement: 1 1 Eight screws need to be removed from the input assembly (located on the rear of the cabinet) using the phillips head screwdriver. Once the screws are removed, the input assembly may be loosened by prying a fl at head screwdriver in between it and the cabinet. Keep the eight screws in a safe place. 1 1 2 2 3 3 4 4[...]

  • Page 17

    17 3 3 Two cables need to be removed from the input assembly PCB (as shown on the left and above): (1) the solid black cable attaches to the negative terminal (connection J4). This is for the input jack, and (2) the grey and black cable attaches to the positive terminal (connection J3). This is for the thru jack. Do not force cable removal or conne[...]

  • Page 18

    18 Input assembly replacement continued: 4 4 Place the new input assembly (part #0012048) where the old one was. Follow the same steps as above, but backwards 3 to 1. Remove the serial number from the faulty input assembly (as shown in the picture above) and place on the new input assembly. Power up the S408 and relish in the fact that you just rep[...]

  • Page 19

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