Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!

Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday, 5 March 2019

BOSE 3-2-1 - 3-2-1GS - 3-2-1GSX SERIES II – BASS MODULE (SUBWOOFER) DISASSEMBLING PROCEDURE – STANDARD SATELLITE ARRAY DISASSEMBLING PROCEDURE - GEMSTONE SATELLITE ARRAY DISASSEMBLING PROCEDURE- AUDIO SYSTEM REPAIR AND SERVICE

BOSE 3-2-1 - 3-2-1GS - 3-2-1GSX Series II – Bass Module (subwoofer) Disassembling Procedure – Standard Satellite array Disassembling Procedure - Gemstone Satellite array Disassembling Procedure- Audio system repair and service

Category: Audio System Repair and Service

Contents of this article

Bass Module Removal (SUBWOOFER)
Standard Satellite Removal
Gemstone satellite Removal

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

BASS MODULE DISASSEMBLY PROCEDURES

1. Rear Enclosure Removal
1.1 Place the bass module on its side. Using a phillips-head screwdriver, remove the four screws that secure the rear enclosure to the bass module cabinet.
1.2 Lift the rear enclosure partially off of the bass module.
1.3 Unplug the transformer primary cable at J5 on the input/output PCB located on the back of the rear enclosure.
1.4 Unplug the two ribbon cables at J6 and J7 that run from the input/output PCB to the main PCB. Lift the rear enclosure away from the bass module cabinet.
2. Main PCB Removal
2.1 Perform procedure 1.
2.2 Unplug the woofer harness from the main PCB at J350. This harness plugs into the connector through the holes in the bottom of the main PCB.
2.3 Using a phillips-head screwdriver, remove the four screws that secure the heatsink bracket to the heatsink. Lift off the heatsink bracket.

2.4 Carefully lift the main PCB away from the heatsink. Unplug the power transformer secondary harness from the main PCB at J5. Rotate the main PCB clear of the cabinet until it is at about 90 degrees from the heatsink. At this point, you should be able to lift the PCB clear of the rear enclosure mounting brackets.
3. Power Transformer Removal
3.1 Perform procedure 2 to remove the amplifier/DSP PCB.
3.2 Using a soldering iron, apply heat to the head of one of the screws that secure the transformer to the bass module cabinet. Apply heat for about 20 seconds. Immediately after removing heat from the screw head, use a phillips-head screwdriver to remove the screw. Repeat this for the other three screws.
Heating the screw head releases the threadlock adhesive that is used on these screws in manufacturing.
3.3 Lift the power transformer out of the cabinet.
4. Input/Output Board Removal
4.1 Perform procedure 1 to remove the rear enclosure.
4.2 Using a phillips-head screwdriver, remove the two screws that secure the input/ output board bracket to the rear enclosure. Lift off the bracket. Slide the input/output board out of the rear enclosure.

STANDARD SATELLITE ARRAY DISASSEMBLY PROCEDURES

Notes:
# The standard satellite arrays are nonrepairable. These are the arrays that have the cloth grilles, and are physically larger than the GemstoneTM array.
# The only parts that can be replaced on the standard arrays are the grille and the nameplate. Refer to the photos at right for the following procedures.
1. Grille Removal
1.1 Wrap some masking tape around the shaft of a flat-tip screwdriver approximately 1/2" back from the end. This is needed to protect the plastic enclosure of the array.
1.2 Place the satellite array on its back on a bench. Use your thumb to press down on the array grille at the center of the curve near the side. At the same time, use the screwdriver to pry the end of the grille off of the array enclosure. Repeat this at the other end of the grille.
Re-Assembly Note: Align the grille so that the Bose logo is facing the same direction as the arrows on the front of the array enclosure. Press the grille in place. It should latch to the enclosure at each end.

GEMSTONE SATELLITE ARRAY DISASSEMBLY PROCEDURES
1. Grille Removal
1.1 Using a scribe or small flat-tip screwdriver, grasp the edge of the grille. Gently pull the grille away from the enclosure.
2. Driver Removal
2.1 Perform procedure 1.
2.2 Using a Phillips-head screwdriver, remove the four screws that secure the driver to the enclosure. Lift the driver out of the enclosure and cut the wires as close to the driver as possible.