Mackie S408 Operating instructions

1
S408 REPAIR MANUAL
S408 REPAIR MANUAL

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 determine the nature of the problem and what parts will repair the unit.
Tools needed:
***NOTE: not all tools listed below will be needed for your repair***
• Phillips head screwdriver.
• 3mm allen wrench.
• 8mm combination wrench.
• Solid workbench.
Parts needed:
***NOTE: not all parts listed below will be needed for your repair***
• 8” Woofer (Top Left) Part #0011806 pages 3-4
• 8” Woofer (Top Right) Part #0011806 pages 5-6
• 8” Woofer (Bottom Left) Part #0011806 pages 7-8
• 8” Woofer (Bottom Right) Part #0011806 pages 9-10
• High Frequency Driver Part #0008093 pages 11-13
• Diaphragm Part #coming soon pages 14-15
• Input Assembly Part #0012048 pages 16-18
Safety Warnings:
• Make sure that you disconnect all cords before you begin these procedures.
• Always use safety glasses!
• Please try NOT to touch any of the pcb circuitry, capacitors, resistors, etc.
• Take care to read and follow these instructions. It may help to read the
instructions prior to the repair to get an idea of what it entails.

3
Top left woofer replacement:
1
1Six 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, the
screws also hold the decorative trim. The
trim should be removed, too. Keep the
twelve screws in a safe place.
2
2Eight 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 flat 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 (as pointed out
by the arrows in the picture above).
Also note the “tinsel dressing teardrops”
(circled above) which are facing down.
The woofer should be placed back the
same way. It is for visual consistency.
More importantly, the cables from the
printed circuit board to the woofer
terminals are quite short; it probably
would not work otherwise. The eight
screws should be kept in a safe place.
8
8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
9
9
10
10
11
11
12
12
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8

4
3
3Carefully begin to remove the woofer.
Caution: The woofer is approximately
8 pounds with the weight unevenly
distributed.
Top left woofer replacement continued:
4
4The 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 terminal
and pulling out the cable.
5
5The picture above shows what the S408 looks like with the grill and top left woofer
removed. Place the new woofer (part
#0011806) where the old one was. Follow
the same steps as above, but backwards
4 to 1. Power up the S408 and the
new woofer should now be pumping
out glorious lows. Awesome, you just
replaced an 8” woofer!
*
*If you find it too difficult to connect the
cables to the woofer terminals due to
the short length of the cables, there
is an easier (albeit lengthier) way to
connect them. Instead of reconnecting
the cables to their terminals, just attach
the woofer to the cabinet as normal.
Follow steps 1-5 on how to remove the
horn assembly (pages 11-12) as this is
an easier way to access the woofer
terminals without having to work under
such tight circumstances!
+
+
-
-
push down
push down

5
Top right woofer replacement:
2
2Eight 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 flat 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 (as pointed out
by the arrows in the picture above).
Also note the “tinsel dressing teardrops”
(circled above) which are facing down.
The woofer should be placed back the
same way. It is for visual consistency.
More importantly, the cables from the
printed circuit board to the woofer
terminals are quite short; it probably
would not work otherwise. The eight
screws should be kept in a safe place.
8
8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
9
9
10
10
11
11
12
12
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
1
1Six 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, the
screws also hold the decorative trim. The
trim should be removed, too. Keep the
twelve screws in a safe place.

6
3
3Carefully begin to remove the woofer.
Caution: The woofer is approximately
8 pounds with the weight unevenly
distributed.
Top right woofer replacement continued:
4
4The 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 terminal
and pulling out the cable.
5
5The picture above shows what the S408 looks like with the grill and top right
woofer removed. Place the new woofer
(part #0011806) where the old one was.
Follow the same steps as above, but
backwards 4 to 1. Power up the S408
and the new woofer should now be
pumping out glorious lows. Awesome,
you just replaced an 8” woofer!
+
+
-
-
push down
push down
*
*If you find it too difficult to connect the
cables to the woofer terminals due to
the short length of the cables, there
is an easier (albeit lengthier) way to
connect them. Instead of reconnecting
the cables to their terminals, just attach
the woofer to the cabinet as normal.
Follow steps 1-5 on how to remove the
horn assembly (pages 11-12) as this is
an easier way to access the woofer
terminals without having to work under
such tight circumstances!

7
Bottom left woofer replacement:
2
2Eight 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 flat 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 woofer (as pointed out
by the arrows in the picture above).
Also note the “tinsel dressing teardrops”
(circled above) which are facing
upwards. The woofer should be placed
back the same way. It is for visual
consistency. More importantly, the
cables from the printed circuit board to
the woofer terminals are quite short; it
probably would not work otherwise. The
eight screws should be kept in a safe
place.
8
8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
9
9
10
10
11
11
12
12
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
1
1Six 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, the
screws also hold the decorative trim. The
trim should be removed, too. Keep the
twelve screws in a safe place.

8
3
3Carefully begin to remove the woofer.
Caution: The woofer is approximately
8 pounds with the weight unevenly
distributed.
Bottom left woofer replacement continued:
4
4The 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 terminal
and pulling out the cable.
5
5The picture above shows what the S408 looks like with the grill and bottom left
woofer removed. Place the new woofer
(part #0011806) where the old one was.
Follow the same steps as above, but
backwards 4 to 1. Power up the S408
and the new woofer should now be
pumping out glorious lows. Awesome,
you just replaced an 8” woofer!
+
+
-
-
push down
push down
*
*If you find it too difficult to connect the
cables to the woofer terminals due to
the short length of the cables, there
is an easier (albeit lengthier) way to
connect them. Instead of reconnecting
the cables to their terminals, just attach
the woofer to the cabinet as normal.
Follow steps 1-5 on how to remove the
horn assembly (pages 11-12) as this is
an easier way to access the woofer
terminals without having to work under
such tight circumstances!

9
Bottom right woofer replacement:
2
2Eight 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 flat 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 woofer (as pointed out
by the arrows in the picture above).
Also note the “tinsel dressing teardrops”
(circled above) which are facing
upwards. The woofer should be placed
back the same way. It is for visual
consistency. More importantly, the
cables from the printed circuit board to
the woofer terminals are quite short; it
probably would not work otherwise. The
eight screws should be kept in a safe
place.
8
8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
9
9
10
10
11
11
12
12
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
1
1Six 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, the
screws also hold the decorative trim. The
trim should be removed, too. Keep the
twelve screws in a safe place.

10
3
3Carefully begin to remove the woofer.
Caution: The woofer is approximately
8 pounds with the weight unevenly
distributed.
Bottom right woofer replacement continued:
4
4The 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 terminal
and pulling out the cable.
5
5The picture above shows what the S408 looks like with the grill and bottom right
woofer removed. Place the new woofer
(part #0011806) where the old one was.
Follow the same steps as above, but
backwards 4 to 1. Power up the S408
and the new woofer should now be
pumping out glorious lows. Awesome,
you just replaced an 8” woofer!
+
+
-
-
push down
push down
*
*If you find it too difficult to connect the
cables to the woofer terminals due to
the short length of the cables, there
is an easier (albeit lengthier) way to
connect them. Instead of reconnecting
the cables to their terminals, just attach
the woofer to the cabinet as normal.
Follow steps 1-5 on how to remove the
horn assembly (pages 11-12) as this is
an easier way to access the woofer
terminals without having to work under
such tight circumstances!