Sunday, February 07, 2016

BOSE 3-2-1 - 3-2-1GS - 3-2-1GSX Series II – Console Disassembling Procedure – Audio system repair and service

Category: Audio System Repair and Service 

Contents of this article 

  • Outer cover removal 
  • Tuner PCB Removal
  • DVD/DC Drive removal 


BOSE 3-2-1 - 3-2-1GS - 3-2-1GSX Series II

CONSOLE DISASSEMBLY PROCEDURES
1. Outer Bezel Removal
1.1 Remove the DVD drawer bezel. To do this, you will need to either apply power to the console and press the EJECT button, or use the manual DVD drawer eject function. This is done by placing a small screwdriver into the front of the slot located in the bottom of the bezel sub-assembly and rapidly moving the screwdriver toward the rear of the console. This will press in the built-in eject pin and cause the DVD drawer to open.
1.2 Gently unclip the DVD drawer bezel from the front of the DVD drawer and lift it off.
1.3 Close the DVD drawer.
IMPORTANT NOTE: If you close the drawer manually with no power applied, it will not latch properly. Once you have repaired the unit, make sure to apply power to the console and cycle the drawer open and closed to properly latch it in place before returning it to the customer. Failure to do this will cause the drive to be damaged in shipment.
1.4 On the bottom edge of the outer bezel assembly, lift the bezel edge away from the console slightly. Lift the top edge of the outer bezel assembly away from the console slightly. It should lift off and away from the console, revealing the button PCB, the IR PCB (located below the center of the button PCB) and the display PCB assembly.
2. Top Cover Removal
Re-assembly Note: When replacing the top cover, torque the top cover screws to no more than 5 inch/lbs. If you over-torque these screws, you will strip out the screw boss in the top cover.
2.1 Perform procedure 1.
2.2 Place the console onto a soft surface with the bottom facing upward. Using a Phillips-head screwdriver, remove the six screws that secure the top cover to the base.

2.3 Grasp the console between the top and bottom of the unit, ensuring that you have a good grip on the unit, and carefully flip the console over onto its feet. Lift the top cover straight off.
3. Inner Bezel Sub-assembly Removal (includes Button PCB, IR Receiver PCB and Display PCB)
3.1 Perform procedure 2.
3.2 Unplug the inner bezel sub-assembly ribbon cables from J6500 and J6700 on the main PCB.
3.3 Using a Phillips-head screwdriver, remove the three screws that secure the bezel to the console. There is one screw at each end of the bezel and one in the center below the IR receiver.
3.4 Lift off the bezel. The button PCB, IR receiver PCB and display PCB will come off with the bezel.
3.5 The IR receiver PCB is connected to the button PCB by a ribbon cable. To remove it, unplug the ribbon cable at the button PCB end, and use a small flat-tip screwdriver to push back the small plastic arm that retains the PCB in the bezel. Lift out the PCB.
3.6 The button PCB is retained in the top of the bezel. To remove it, unplug the IR receiver PCB ribbon cable and the button PCB ribbon cable. Once the ribbon cable is unplugged, press upward on the ribbon cable connector on the underside of the bezel top edge. The button PCB should slide off of the bezel posts.
3.7 The display PCB assembly is located in the right side of the bezel. To remove it, lay the bezel face-down. Use a small flat-tip screwdriver to release the display PCB from the four retaining clips. Lift out the display PCB assembly. Note: The display PCB assembly is not repairable. You must replace it as an assembly if it is defective.

4. Tuner PCB Removal
4.1 Perform procedure 2.
4.2 Lift up on the forward edge of the and slide it toward the front of the console until the PCB jacks clear the rear panel. Lift the
PCB straight up.
4.3 Unplug the tuner PCB ribbon cable from J6000 on the main PCB.
Re-assembly Notes:
- Make sure that the RF gasket is in place on the FM antenna connector when re-installing the PCB assembly.
- Make sure that the FM RF connector is centered in the opening in the rear panel before tightening the top cover screws.
5. DVD/CD Drive Removal
5.1 Perform procedure 3.
5.2 Unplug the drive power cable from J3202 on the main PCB.
5.3 Unplug the ATAPI cable from J3200 on
the main PCB.
5.4 Lift the drive and the drive mounting bracket out of the console.
Note: The drive mounting bracket is the plastic bracket that the drive is mounted to that also goes over the main PCB to support the tuner PCB.
5.5 Make a note of the distance the front of the drive overhangs the front edge of the bracket. You will need to align the new drive in the same way, within about 1/16” (2mm). Failure to do this will cause the DVD drive drawer bezel to not line up properly with the LCD display bezel on the front of the console when re-assembled.
5.6 Remove the four screws that secure the drive to the drive mounting bracket. Remove the DVD drawer eject pin from the manual eject hole in the front of the drive. Retain this pin for the new drive.

Re-assembly Note: Be sure to install the
DVD drawer eject pin into the manual eject hole in the front of the drive before reinstalling the bezel assembly.
6. Hard Disc Drive Assembly Removal (GSX consoles only)
6.1 Perform disassembly steps 5.1 to 5.4.
6.2 Unplug the hard disc drive ribbon cable from the hard drive assembly. Make a note of the pin 1 location as denoted by the red stripe on the ribbon cable.
6.3 Lift the hard disc drive assembly out of the console base. The hard disc drive assembly includes the hard disc drive, the thermal pad and the heat spreader plate.
6.4 Remove the ribbon cable from the hard disc drive for re-use on the replacement drive.
Re-assembly Note: When connecting the ribbon cable to the new hard drive assembly, take care that the red stripe aligns with pin 1 of the connector.
CAUTION: Handle the replacement hard drive with care. Do not physically shock the replacement hard drive assembly. Damage to the drive could occur. Handle the new hard disc drive by the sides of the frame only. Do not put any pressure on the label or drive boards or you will damage the drive.
7. Main PCB Assembly Removal
7.1 Perform procedure 5.
7.2 Lift up the front edge of the main PCB assembly. Slide the PCB forward until the jacks clear the back panel. Lift out the PCB assembly.
Re-assembly Notes:
1. Make sure that the RF gasket is in place on top of the Bose Link connector when reinstalling the PCB assembly.
2. When installing the main PCB, make sure it is over the locating pin at the front of the console.