Tuesday, February 09, 2016

BOSE TV Sound System Solo 10-20 – Test procedure – Step By Step Disassembling Procedure – Tap command setup – Audio system repair and service

                                                 Category: Audio System Repair and Service 

Contents of this article

  • Test procedure
  • Tap cam and setup  
  • Disassembling procedure 


BOSE Solo 10-20

Test Procedures
Required Equipment
1. Tera Term terminal emulator - download at  sourceforge.jp/projects/ttssh2/
2. TAP cable 264565 ( used for TAP commands)
3. RS232-TTL Converter - B&B electronics Model 232LPTTL or similar bb-elec
4. An A/D converter and audio generator
5. Computer setup to issue TAP commands
1. Air Leak and Bass Control Test
1.1 Apply a 70 Hz, 50 mVrms signal to the left and right input of the A/D converter.
1.2 Connect the A/D converter Coax output to the unit’s Coax input.
1.3 Issue TAP command “remote o” to turn the unit on, or press the remote ON button.
1.4 Issue TAP command “VO 100” to set the volume to maximum level.
1.5 Adjust the bass control to the center position.
1.6 Listen for any air leaks from sealed enclosures such as the top cover and drivers.
1.7
Rotate the bass knob to the full minus position and then to the full plus position. You should notice a corresponding decrease and increase in bass.
2. Buzz and Sweep Test
2.1 Apply a 35 Hz, 25mVrms signal to the left and right input of the A/D converter.
2.2 Connect the A/D converter Coax output to the unit’s Coax input.
2.3 Issue the TAP command “remote 0” to turn the unit on, or press the remote ON button.
2.4 Issue the TAP command “VO 100” to set the volume to maximum level.
2.5 Sweep the generator from 35 Hz to 3 kHz.
2.6 Listen for buzz, rub, or extraneous sounds.
Localize and repair any buzz. Replace any transducer that rubs or produces extraneous sounds.
3. Left, Right, Center Output Test
3.1 Connect the A/D converter Coax output to the unit’s Coax input.
3.2 Apply a 1 kHz, 10mVrms signal to the left input of the A/D converter.
3.3 Listen for clean, undistorted audio from the left speaker.
3.4 Apply the signal to the right input of the A/D converter.
3.6 Lister for clean, undistorted audio from the right speaker.
3.7 Apply the signal to the right and left input of the A/d converter.
3.8 Listen for clean, undistored audio from the three center speakers.
4. Input Test
Note: Connect only the input being tested to avoid triggering the auto select circuit.
4.1 Issue the TAP command “remote 0” to turn the unit on, or press the remote on button.
4.2 Issue the TAP command “VO 100” to set the volume to maximum.
4.3 Apply a 200 Hz, 25 mVrms signal to the unit’s left and right analog RCA input.
4.4 Listen for clean, undistorted audio from the unit.
4.5 Apply a 200 Hz, 25 mVrms signal to the left and right input of the A/D converter.
4.6 Connect the A/D converter Coax output to the unit’s Coax input.
4.7 Listen for clean, undistorted audio from the unit.
4.8 Apply a 200 Hz, 25 mVrms signal to the left and right input of the A/D converter.
4.9 Connect the A/D converter Optical output to the unit’s Optical input.
4.10 Listen for clean, undistorted audio from the unit.
Performance Verification
4. Auto Select
This is only needed if the input test is performed with all inputs connected. Otherwise, the unit’s auto select circuit will select just the Optical input – the highest performance signal. The auto selection sequence is Optical, Coax, Analog.
4.1 Issue the TAP command “remote 0” to turn the unit on, or press the remote ON button.
4.2 Issue the TAP command “VO 100” to set the volume to maximum level.
4.3 Issue TAP command “audio auto, 0” to disable auto input selection.
4.4 Apply a 70 Hz, 50 mVrms signal to the left and right analog input.
4.5 Issue TAP command “audio input, 0” to select the Analog input.
4.6 Apply a 70 Hz, 50 mVrms signal to the left and right input of the A/D converter.
4.7 Connect the A/D converter Coax output to the unit’s Coax input.
4.8 Issue TAP command “audio input, 1” to select the Coax input.
4.9 Connect the A/D converter Optical output to the unit’s Optical input.
4.10 Issue TAP command “audio input, 2” to select the Optical input.
4.11 Issue TAP command “audio auto, 1” to enable auto input selection before returning the unit to the customer.
5. Factory Default
It is important to reset the unit to its factory default setting after testing since the unit stores the last volume setting. Some tests required the volume to be set at full (100). Because the last volume setting was 100, when first turned on by the customer, the unit would be at full volume.
Note: Factory default volume is 30.
5.1 Use the remote to turn on the unit or issue TAP command “remote 0”
5.2 Issue TAP command “fd”
5.3 Turn the unit off with the remote or TAP command “remote 0”
5.4 Remove power from the unit.
Note: To check the volume setting, turn the unit on with the remote or by issuing TAP command “remote 0”. Issue the TAP command “VO” to view the volume setting. Response = 0/30/100. The middle number is the volume level the unit will turn onto.
6. Hi-Pot Test, Mandatory Test
Important note: If the unit has been disassembled, a Hi-Pot test must be performed before returning the unit to the customer to ensure there is no potential for a shock hazard.
6.1 Test points are from the AC power input (both line and neutral) to all connectors on the rear of the product.
6.2 Hi-Pot tester settings for all voltage variants.
Type of product: 200-240 VAC 2-wire Class II
Test Voltage: 3000 VAC
Trip Current Limits: 1.5mA min, 2.16 mA max
Ramp: 1 sec
Dwell: 3 sec
6.3 Connect the AC line cord into the rear of the Bose  Solo TV Sound System. Connect the other end of the AC line cord to the Hi-Pot tester.
6.4 With the tester set to the above settings, perform the test. Failure of this test indicates a faulty transformer, incorrectly dressed primary wires, or incorrectly adjusted trip point on tester. Repair any fault found.
TAP Commands
Required Items
1. TeraTerm terminal emulator - download at sourceforge.jp/projects/ttssh2/
2. TAP Cable part number 264565
3. RS232-TTL Converter - B&B electronics Model 232LPTTL or similar - bb-elec
Setup
1. Connect the TAP cable, using a RS232-TTL converter, to your computer’s COM port and the unit’s DATA connector on the rear.
2.1 Select COM Port
2.2 Select Serial Port
2.3 Set Serial Port
Baud: 115200, Data bits: 8, Parity: No, Stop bit: 1
2.4 Select Terminal
2.5 Set Terminal to “Local echo” - Click “OK
2.4 Test TAP communication
Enter TAP command VR
System will respond with Software version

Disassembly Procedures
1. PCB Cover Removal
1.1 Remove the 6 screws indicated in Figure.
1.2 Lift off the PCB Cover

2. Main PCB Removal
2.1 Perform procedure 1.
2.2 Remove the 5 screws indicated in Figure.
2.3 Disconnect the 2 cable connectors and 1 ribbon
cable from the Main PCB.
2.4 Pull off the bass knob from the rear of the unit.
Note: When replacing the bass knob, hold the bass POT while pressing on the knob to prevent applying excess pressure to the solder connections on the POT.
2.5 Lift up on the front of the PCB and then pull it forward so the rear connectors clear the enclosure openings.
Note: When replacing the Main PCB, ensure the ground wire is secured as shown in figure . Also, ensure the speaker wire harness is located in the channel shown in figure .


3. Top Cover Removal
3.1 Perform procedure 1 and 2.
3.2 Remove the 31 screws indicated in Figure . 13 screws inside the PCB well and 18 screws around the perimeter of the unit.
3.3 Flip the unit over and slowly lift off the top cover. Use care to prevent the gasket from being pulled away with the top cover. The gasket should remain in the channels of the enclosure.
Note: There is no replacement gasket available.

4A. Metal Grille Removal
4A.1 Perform procedure 3 first. The top cover must be removed because pins in the top cover fit into the grommets on the metal grille securing the top of the grille in place.
4A.2 On the bottom of the unit, remove the four screws securing the grille as indicated in Figure.

4A.3 Turn the unit over. Grasp the grille by the sides as indicated by the arrows in Figure and pull forward to release the grille edge from the enclosure. Work the grille out of the cabinet using care not to bend the grille.
Note: When installing the metal grille, make sure the 5 rubber grommets are inserted in the grille holes indicated in figure . When installing the cover, ensure the 5 pins on the cover insert into the grommets to ensure proper grille alignment.

4B. Cloth Grill Removal
4B.1 Perform procedure 3 first. The top cover has to be removed to properly grasp the grill to remove it.
4B.2 Grasp a side edge of the grille and pull it straight forward to release the grille clip from the enclosure’s clip catch. Do this for both the other side. See figure and .

4B.3 After releasing the left and right side of the grille, pull the grille forward working toward the center releasing its posts from the grommets in the inclosure. See figure.


5. Driver Removal
5.1 Perform procedures 4 first.
5.2 Remove the four screws securing the driver. Pull out the driver and disconnect the driver wire harness from the driver. See figure.


6. IR PCB Removal
6.1 Perform procedures 4 first.
6.2 Disconnect the flat flex cable from the IR PCB.
6.3 Grasp both sides of the IR PCB and slide it out of the slots indicated in figure.