Monday, February 15, 2016

Bose Lifestyle 135 Bass Module Disassembly Procedures - system repair and service Audio

Category: Audio System Repair and service 

Contents of this article

  • Rear cover removal
  • IN/OUT PCB removal
  • Power supply removal 

Bose Lifestyle 135

DISASSEMBLING PROCEDURE  
1. Rear Cover Removal
1.1 Remove the four screws securing the rear cover.
Note: When replacing the rear cover, tighten the screws to ensure the cover aligns properly.
1.2 Lay the bass module on its’ right side. Rotate the rear cover to gain access to the AC wire harness. Disconnect the AC wire harness from the power supply PCB.

2. I/O PCB Removal
2.1 Perform procedure 1 first
2.2 Slightly rotate the cover to gain access to the AC wire harness. Disconnect the AC wire harness.
2.3 Use a U.FL extraction tool, such as Hirose part number U.FL-LP-N-2(01), to disconnect the antenna’s U.FL connector.– Antenna Cable .Use care when removing antenna’s U.FL connector to avoid damaging the connector.
Note: When replacing the I/O PCB, use care not to damage the antenna’s U.FL connector when reconnecting. Press gently straight down to insert the U.FL connector. Excessive or angled pressure will damage the connector. When properly installed, the antenna cable will rotate freely about the connector. Do not rotate more than 1/8th of a turn to avoid damaging the connector.

2.4 With the cover laying flat on the bench, remove the two screws securing the connector cover. Lift off the connector cover.
Important Note: To reduce stress on the U.FL connector, the connector cover should be in place before connecting the antenna cable’s U.FL connector. Be sure to leave enough cable length so the cable can be easily attached to the U.FL connector without stessing the connector.
Note: When replacing the connector cover, ensure the antenna cable is properly dressed under the groove in the connector cover.

2.5 Remove the ribbon cable.
2.6 Remove the screw securing the I/O PCB. Lift out the I/O PCB.
3. Power Supply PCB Removal
3.1 Perform Procedure 1, 2.3, and 2.4 first
3.2 Remove the two screws securing the heat sink. Lift out the heat sink.
Note: When replacing the heatsink, ensure the ribbon cable is routed under the heatsink.

3.3 Remove the six screws securing the power supply shield and PCB. Lift off the power supply shield and PCB.
Note: 1. When installing the power supply PCB, ensure the thermal pad is located over U1001 and L1001. If the thermal pad is moved, it should be replaced because the compressed areas on the thermal pad will no longer align with the heatsink. It is important that there is good thermal contact between the thermal pad and heatsink.
2. When replacing the shield, ensure the conductive pad.
3. When replacing the shield, first secure the two screws and ensure proper alignment of the shield.