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DISASSEMBLY PROCEDURES
3.5 On the rear of the console base (21),
unclip the four tabs that secure the I/O panel
(19) to the base. Pull away and down on the
top of the I/O panel until it unclips from the
base. It should come off completely.
3.6 Carefully lift the front edge of the main
PCB (20) out of the base. Slide the main
PCB forward slightly until it clears the jacks
on the back of the board. Lift the main PCB
out of the base.
Re-assembly notes:
Be sure to install a thermal barrier, Bose
part number 267574-001 into the console
chassis before re-installing the main PCB.
On the main PCB, check to make sure that
the large thermal pad (16) is in place on top
of the DVD decoder IC (U3000) and the
small thermal pad (17) is in place on top of
the CODEC IC (U4000). Check that the
eight small EMI shield conductive strips
(15,18) are in place in the groove around the
bottom of the casting (14).
On the heatsink (9), use a straight-edge
razor blade to scrape off any thermal phase
change pad (11) material. Take care to not
scratch the coating on the heatsink. Clean off
any residue with alcohol. On the main PCB,
clean any thermal phase change pad residue
off of the output IC. Apply a small amount of
thermal compound to the back of the output
IC.
4. LCD Display PCB Removal
4.1 Perform procedure 2.
4.2 On the main PCB (20), unplug the ribbon
cable at jack J6500. Peel off the foil ground
strap (24) located directly under the ribbon
cable. You will need to re-install this later.
4.3 Using a small flat-tip screwdriver, press
in the tabs that secure the bezel sub assem-
bly (26) to the console base (21). There are
two located at the top of the base behind the
front panel near the ribbon cable and the
heatsink (9). There are two more inside the
opening for the DVD drawer.Release the four tabs on the bottom of the
base directly behind the bezel sub assembly.
Take care not to drop the LCD display PCB.
4.4 Place the bezel sub assembly face
down on a soft surface. Lift the LCD display
PCB out of the bezel sub assembly. Using
a small flat-tip screwdriver, flip up the edge
of the ZIF connector at J2. Unplug the ribbon
cable. Take care to not plug and unplug this
cable too many times. It has a carbon coat-
ing that wears off after just a few removals
and insertions, ruining the cable.
Bass Module Procedures
Refer to Figure 2 for the following proce-
dures.
1. Rear Enclosure Removal
1.1 Place the bass module on its side.
Using a Phillips-head screwdriver, remove
the four screws (9) that secure the rear
enclosure (8) to the bass module.
1.2 Slide the rear enclosure off of the bass
module.
2. Power Transformer Removal
2.1 Perform procedure 1.
2.2 On the bass module PCB/heatsink
assembly, unplug the cables at J3 and J5
that run to the power transformer. Unplug
the woofer harness cable at J7.
2.3 Using an 8/32" nut driver, remove the
four nuts (6) that secure the power trans-
former (7) to the bass module enclosure.
2.4 Lift the power transformer off of the
mounting studs (5) and out of the enclosure.
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DISASSEMBLY PROCEDURES
3. Bass Module PCB/Heatsink Assembly
Removal
3.1 Perform procedure 1.
3.2 On the bass module PCB/heatsink
assembly (10), unplug the cables at J3 and
J5. Unplug the woofer harness cable at J7.
3.3 Remove the four screws (11) that secure
the bass module PCB/heatsink assembly to
the enclosure. Lift it out of the enclosure.
3
21 Satellite Array Procedures
Note: The standard 321 (non-GS) satellite
arrays are non-repairable. The only parts that
can be replaced are the grille and the name-
plate.
1. Grille Removal
1.1 Wrap some masking tape around the
shaft of a flat-tip screwdriver approximately
1/2" back from the end. This is needed to
protect the plastic enclosure of the array.
1.2 Place the satellite array on its back on a
bench. Use your thumb to press down on the
array grille at the center of the curve near the
side. At the same time, use the screwdriver
to pry the end of the grille off of the array
enclosure. Repeat this at the other end of the
grille.
2. Nameplate Removal
2.1 Perform satellite array procedure 1.
2.2 On the back of the grille (1), unbend the
two metal legs that secure the nameplate (2)
to the grille. Pull the nameplate away from
the grille.3
21 GS Satellite Array Procedures
Note: Refer to the figure below for the
following procedures.
1. Grille Removal
1.1 Using a scribe or small flat blade screw-
driver to grasp the edge of the grille (2).
Gently pull the grille away from the enclo-
sure.
2. Twiddler
TM Removal
2.1 Perform procedure 1.
2.2 Using a Philips-head screwdriver, re-
move the four screws (5) that secure the
driver (1) you wish to remove.
2.3 Lift the driver out of the enclosure and
remove the two faston connectors of the
wiring harness.
Re-assembly note: Be sure that the driver
gasket is properly aligned behind the driver
to ensure an airtight seal.
1
2
3
44x
58x1
