Disassembly/Assembly Procedures - Bose 1801 Service Manual

DISASSEMBLY/ASSEMBLY PROCEDURES

Note: Refer to Figure 1 for the following
procedures.
1. Top Cover Removal
1.1 Remove the two screws that secure
the top cover at the rear of the unit. Loosen
the two screws located on each side of the
unit towards the front.
1.2 Slide the top cover towards the rear of
the unit and lift the cover off the unit.
2. Top Cover Replacement
2.1 Slide the top cover onto the unit while
making sure the screws on the side of the
unit are lining up with the slots in the top
cover.
2.2 Secure the top cover to the unit.
3. Amplifier PCB Removal
3.1 Perform procedure 1.
3.2 Disconnect the wire harness, the two
wires connected to the thermal cutout, and
the input cable going to the PCB.
3.3 Remove the six screws (2B) located on
the side of the unit between the heat sink
fins (see Figure 2).
3.4 Carefully pry the PCB inward towards
the power transformer (the PCB is stuck to
the chassis by the heat sinking compound)
and lift the board out of the unit.
4. Amplifier PCB Replacement
4.1 Slide the PCB into place. Be sure there
is sufficient heat sink compound on the
PCB's heat sink.
4.2 Align the six screws that secure the
PCB into place and secure the PCB to the
chassis.
1801 Power Amplifier
4.3 Connect the wire harness, thermal
cutout wires, and the input cable to the
PCB.
5. Front Panel Removal
5.1 Perform procedure 1.
5.2 Remove the nut securing the top of the
front panel. The nut is located on the inside
of the front chassis beside the thermal
cutout indicator.
5.3 Remove the knobs on the controls and
remove the two shaft nuts holding the front
panel in place.
6. Front Panel Replacement
6.1 Align the front panel over the controls
and secure it in place.
6.2 Secure the top of the front panel and
replace the knobs.
6.3 Perform procedure 2.
7. Front Chassis Assembly Removal
7.1 Perform procedure 5.
7.2 Locate and remove the four screws
that secure the front assembly to the
chassis.
7.3 Push down on the top of the front
assembly to release the bottom of the
assembly and pull the assembly towards
you.
8. Front Chassis Assembly Replacement
8.1 While pushing down on the front
assembly slide the assembly in towards the
unit.
8.2 Pull up on the front assembly to align
the screw holes with the unit and secure
the assembly in place.
8.3 Perform procedure 6.
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