Product: BUILT-INvisible® Home Theater System |
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172780-B2 |
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Subject: Distortion in 3 Room variation |
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Effective |
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Date: |
11/99 |
S/N: Units built before 11/99 |
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Symptom: Distortion on the Room 3 Mono channel of the BUILT-INvisible 3 Room System
Reason: Some BUILT-INvisible 3 Room amplifiers have been built with an SMD jumper at location JP10 instead of location JP9 on the personality module.
Solution: On all units built before 11/99, verify that the SMD jumper is installed at location JP9 instead of JP10 on the 3 Room personality module. Location JP10 should be empty. This jumper is located in approximately the center of the PCB on the SMD side of the board. If the jumper is installed at JP10, carefully remove it and install it in location JP9. Refer to the schematic for the 3 Room personality module, assembly number AS175462-02, sheet 6 of 8 and the layout diagram in the BUILT-INvisible service manual, part number 172780 Rev. 01.
Note: This part is shown installed in location JP10 on the schematic diagram as well as listed in the part list as JP10 in Rev. 00 of the BUILT-INvisible service manual. The part is shown in location JP9 in the schematic diagram and listed in the
part list as JP9 in Rev. 01 of the service manual.
Details: An SMD jumper in location JP10 causes an interaction between Zone 1 (Room 2) and Zone 2 (Room 3), resulting in distortion at the Room 3 Mono output. Removing this jumper from JP10 and installing it in location JP9 removes this undesired interaction, and eliminates the distortion.
Note: Changing this jumper to location JP9 will also change the amplifier’s internal switching configuration. This change is seen when using two active signal inputs to the amplifier at the same time. See the tables below.
Active Input |
Signal will play |
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in rooms: |
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1 |
2 |
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3 |
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Main Input |
• |
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Aux Input |
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• |
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• |
Active Input |
Signal will play |
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in rooms: |
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1 |
2 |
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3 |
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Main Input |
• |
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• |
Aux Input |
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• |
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Jumper in location JP10 |
Jumper in location JP9 |
(undesired configuration) |
(desired configuration) |
Date issued: 11/99
ECN: 26912
FRACAS: D275
Bose Corporation
The Mountain
Framingham, Ma. 01701-9168
For Technical Assistance Call 1-800-367-4008
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