Bose 1801 Service Manual download pdf (Page 8)

7

DISASSEMBLY/ASSEMBLY PROCEDURES

5.2 Locate and remove the eight screws

holding the front panel to the chassis. Four

of the screws are located just inside the

two handles and the other four are the

larger screws on the front panel.

5.3 Using the handles pull the front panel

away from the chassis enough to access

the gain controls and LED PCB.

6. Front Panel Replacement

6.1 Slide the front panel into place. Be

careful not to pinch the wiring harness at

the bottom of the front panel between it

and the chassis.

6.2 Align the holes in the front panel with

the chassis, place the screws into their

location by hand and then tighten with a

screwdriver.

Note: While tightening the screws lift up

on the top lip of the panel to provide

enough room to slide the top cover under

the lip.

7. LED PCB Removal

7.1 Perform procedure 5.

7.2 Remove the two screws that secure

the PCB to the front panel.

7.3 Unsolder the wires at the LED PCB,

make a note of the wiring configuration,

and remove the board from the unit.

8. LED PCB Replacement

8.1 Place the LED PCB into place on the

front panel.

8.2 Secure the PCB to the front panel.

8.3 Resolder the wires to the LED PCB.

Note: Refer to Figure 1 for the following

procedures.

1. Top Cover Removal

1.1 Remove the four screws that secure

the top cover to the unit.

1.2 Slide the top cover towards the back of

the unit and lift it off.

2. Top Cover Replacement

2.1 Place the top cover on to the unit and

slide it under the front panel lip.

2.2 Secure the top cover to the unit.

3. Amplifier PCB Removal

3.1 Perform procedure 1.

3.2 Disconnect the wire harness, input

cable, and the two wires going to the

thermal cutout.

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 sinking 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.

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.

1800 Power Amplifier

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