Sunday, January 17, 2016

BOSE SoundDock Digital Music System Disassembling procedure - Test Procedure - Audio system repair and service - Manual Service

Category: Audio System Repair and Service 

Contents of this article 

  • Disassembling The soundDock
  • Testing the soundDock 

BOSE SoundDock 

SoundDock Functional Tests
Equipment Required
Digital Multi-meter
Audio Signal Generator
iPod Eliminator PCB, P/N 287089
1. Begin the test with no power applied to the SoundDock.
2. Confirm the audio signal generator output is set to zero volts before connecting it to the SoundDock.
3. Remove the input signal before removing power from the SoundDock.
1. Air Leak Test
1.1 Install the iPod Eliminator board into SoundDock’s docking cradle and connect the audio signal generator to the eliminator board via a 3.5mm minijack cable.
1.2 Apply power to the SoundDock. (Note: This will cause SoundDock to ramp to a suitable volume level for the test.)
1.3 Set the signal generator output to:
A. Voltage = 750mV +10%.
B. Frequency = 80Hz +10%
1.4 Listen for potential air leaks around all the cabinet seams, joints, and wire harness through-holes.
PASS if no audible air leaks can be heard at a distance >1ft 0.3M) from any exterior surface of the enclosure.
FAIL if any air leaks can be heard at a distance >1ft (0.3M) from any exterior surface of the enclosure.
1.5 Reduce the input signal to zero volts.
2. Left Right Driver Test
2.1 Apply the input signal to SoundDock’s left channel only. Set Generator as in step 1.3, except set the frequency to 800Hz and confirm that only the left driver plays.
2.2 Reduce generator output to zero volts.
2.3 Repeat step 2.1 for the Right channel.
2.4 Reduce Input signal to zero volts and reconnect SoundDock’s right channel.
3. Frequency Sweep Test
3.1 Set audio signal generator to:
A. Voltage = 750mV +10%.
B. Sweep Range = 40HZ - 5KHz +10%.
3.2 Execute the sweep for a minimum of five seconds up and then down the range.
3.3 Listen for any extraneous noises such as buzzes, rattles, ticks, and distortion.
PASS if no noise can be heard at a distance > 1ft 0.3M).
FAIL if any noise can be heard at a distance of > 1ft (0.3M).
3.4 Reduce the input signal to zero volts.
4. Button & Remote Control Test
4.1 Set Audio Signal generator to:
A. Voltage = 100mV +10%.
B. Frequency = 100Hz
4.2 Using the Volume Down button, momentarily press & hold the Volume Down button. Verify that the SoundDock responds to the commands.
4.3 Using the Volume Up button, momentarily press & hold the Volume Up button. Verify that the SoundDock responds to the command.
4.4 Using the Remote control, turn the volume down. Verify that the SoundDock responds to the command.
4.5 Adjust the generator to zero volts and disconnect it from the SoundDock.
1. Docking Cradle Assy Removal
1.1 Remove the four Phillips-head screws located on the bottom side of the docking cradle assembly. See figure 5.0.
1.1 Lift the docking cradle assembly slightly away from the speaker enclosure and disconnect the 20 conductor flexible flat cable (FFC) before removing the cradle Assy completely.
Note: This cable provides signal paths between the amplifier and digital signal processor PCB’s.

2. DSP PCB Removal
2.1 Remove the cover from the Cradle Assy and note the orientation of the 24 conductor FF cable prior to disconnecting it from the Digital Signal Processor (DSP) PCB. Ensure that the foam protection on the cable is facing the cradle cover upon reinstallation.
2.2 Slide the DSP PCB out of the cradle housing and disconnect the 24 conductor FF cable.

3. Docking PCB removal
3.1 Remove three torx-head (T7) screws.
3.2 Inspect the docking connector for signs of excessive wear and replace if necessary.

4. Grille Removal
4.1 Carefully push the bottom edge of the grille up using your thumbs while pushing down on the speaker housing with your index fingers.
4.2 Work the remaining sides of the grille up until it is completely disengaged from the SoundDock.
4.3 Inspect the grille for damage and replace it if necessary.

5. Amplifier PCB Assy Removal
5.1 Remove the four Phillips-head screws securing the Amplifier PCB Assy to the speaker housing as shown in figure 6.0.
5.2 Using the heatsink fins and FF cable, carefully lift the Amplifier PCB Assy away from the speaker housing.
5.3 Disconnect the IR Receiver PCB FF cable and the Left & Right driver cables from the Amplifier PCB.
5.4 Amplifier PCB, see figure 6.1.
5.5 Position the left and right driver harness. This will ensure that you don’t confuse the phasing of the drivers when reconnecting them to the PCB.