6735 Earl Drive,  Colorado Springs, CO. 80918   719-550-5810

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  ● Equipment Repair Form

  Wave Radio without CD

  ● Wave Radio with CD

  ● Lifestyle CD-5 single disc

  ● Lifestyle CD-20, 6 disc

  ● Acoustic Wave
         
CD-2000, CD-3000

  ● Acoustic Wave
        AW-1 with Cassette

  ● Lifestyle Systems

  ● Acoustimass Modules

  ● Remotes

   ● Accessories For Sale

 

 

  Bose Residential, Built-In Systems

    Bose residential amplifiers are equalized to sound normal using Bose speakers only. Substituting other makes of amplifiers or
    speakers will give very poor results. Wall volume controls (10k ohm pot) are wired to the volume control terminals of the amp.
    This controls the VCA (voltage controlled amplifier) circuits inside the amplifier. Open connection on the volume terminals will
    cause full volume output, shorted connection will cause no volume output from the amplifier. Series 2 amps have audio input
    sensing circuits that will turn on the amp when audio is input. Series 1 amps are always powered when plugged in.
Older Bose 102EA series 1 wall amplifier under test  
           Static, poor volume, no sound 1 or more channels, these are some of the most common complaints of the series 1 amp.
           Our reconditioning service will bring the amp back to original performance and ensure proper operation for years to come.
Newer Bose 102EA series II wall mounted amplifier Several units in for repair
Bose AM-5BP
Bose 102EA  series II wall amplifier Bose  AM-5BP / AM-SPBP wall amplifier
Did you know the screw terminal blocks are removable on many of the 102EA series II amps.
 No need to unscrew all the wires when removing amp for service!
On some amps the screw terminals are soldered in place in which case you will have to unscrew all the wires
Take photos before removing wires for reference when reconnecting. Always unplug AC power cord before disconnecting amp.

DEMC-2-B  "Dynamically Equalized Music Center"

                Static in controls, no audio, will not turn on, these are some of the common complaints of the DEMC.
                We have parts in stock to repair any issues with the DEMC. We can upgrade so an IPOD or other music device
                can play through the DEMC using the headphone jack of the music player. The Sony CD player needs to be removed
                and no longer used. The Sony CD player is not repairable, parts were discontinued years ago.
                Below is technical information on the 102EA series 2 amplifiers

.

102 EA II  IDENTIFICATION

The Bose BUILT-INvisible amplifier is manufactured in two different versions, audio and video (surround sound). There are four variations for audio and two for video. The four audio variations are, Acoustimass (non-Jewel Cube), Acoustimass Jewel Cube, Three Room System, and 102EA II. The two video variations are non-Jewel Cube and Jewel Cube.

To identify the unit's variation, check the part number and description on the left and right input terminal panels. The Jewel Cube versions of the Acoustimass and video variations will state "Jewel" on the terminal panels, i.e. BUILT-INvisible Jewel Home Theater. If it doesn't state that it is a Jewel Cube version on the terminal panel, then it is the non-Jewel Cube, or Acoustimass-5 cube speaker version.

102EA II System Identification: Part numbers for each variation are as follows:

Video Variation for home theater surround sound
(Jewel Cube and non-Jewel Cube): 172075

Audio Variations:
Acoustimass (Jewel Cube and non-Jewel Cube): 175461-01
Three Room System: 175461-02
102EA-
II: 175461-03

102EA II AUDIO SYSTEMS INFORMATION

Audio Systems Overview

The Bose BUILT-INvisible 102EA II, 3 Room and Acoustimass Amplifiers are completely self-contained systems. They include all of the circuitry required to accept line-level audio sources, to process signals as a two channel/two room system, and to power a variety of Bose installed loudspeakers through some or all of the six power amplifiers contained in the systems. These are audio only systems, and do not process video surround information. There are two video versions of the BUILT-INvisible amplifier that include a Videostage decoder capable of processing video surround information and driving the appropriate Bose loudspeakers for home theater use.

The BUILT-INvisible 102EA II, 3 Room and Acoustimass systems have three stereo inputs, each with differential input circuitry to permit long cable runs through the home while maintaining excellent noise immunity. The inputs accept signals from Bose Lifestyle
Music Centers as well as conventional audio sources. The three stereo inputs connect to an automatic input switcher. This switcher enables the amplifiers to function as three source/two zone systems when used with multiple source components. You can tailor the operation of the automatic input switching to each customer's wishes by means of two preset terminals which allow the installer to determine how the amplifier will behave when presented with multiple sources. Rooms can be configured to switch to a new source when it plays, or remain dedicated to a single source. A single source can play in both rooms, or room 1 can play one source while room 2 plays a second source.
 When you install a system with the Bose CD-20 Music Center, the input switching circuitry should be defeated using the preset terminals located on the amplifier chassis. This allows full control of source selection from the CD-20 remote control.

BUILT-INvisible Audio Systems at Turn-on

The system will come up in standby by default when AC mains power is applied to it as long as none of the turn-on signals listed below are applied. When the system is in standby, the following conditions are in effect:
- The power amplifiers are off
- The DC voltages at the -8 Vdc and +8 Vdc terminals are active
- The Remote Turn-on terminals are enabled
- The Presets are enabled
- The audio signal inputs are enabled
- The automatic input switching circuitry is enabled

When the system is in standby, it is waiting to sense an audio signal at one of its audio input terminals or a remote turn-on signal at one of its remote turn-on terminals. This is the state of operation that the system is normally in as installed when not in use. Once a turn-on signal or an audio signal is applied to the appropriate terminal, then the system will switch into the correct mode of operation as determined by which terminal the input is applied to and how the presets are configured. When the system is in operation, the power amplifiers are enabled, and the system will produce audio at the correct locations.

HOME THEATER SYSTEMS INFORMATION

Video Systems Overview

The Bose BUILT-INvisible home theater is a completely self contained system. It contains all circuitry required to accept line level audio sources, to process signals as a two channel, three speaker music system or as a four channel, six speaker home theater, and to power a variety of Bose installed loudspeakers.

Videostage Surround Processing Circuitry

The system incorporates Bose patented Videostage surround processing circuitry. It is fully compatible with Dolby Surround, Dolby Stereo and UltraStereo. Videostage steering logic was specifically designed for the unique acoustical characteristics of a home environment. Proprietary Bose processing also allows adjustment of the width of the center channel for any screen size. This is not simply the volume of the center channel, but the spatial extent of it as well. You can create many different types of home theater systems using this one chassis. Operating the various systems depends on which terminals you use, which signals you connect, and how you connect them.

Mode Selection

Standby

The system will come up in standby by default when AC mains power is applied to it as long as none of the turn-on signals listed below are applied. When the system is in standby, the following conditions are in effect:
- The power amplifiers are off.
- Terminals 13 (-8 Vdc) and 15 (+8 Vdc) are active.
- Terminal 4 (home theater mode remote turn-on) is enabled.
- Terminal 12 (audio mode remote turn-on) is enabled.
- Terminals 6, 7, 17 and 18 (audio signal inputs) are enabled.
- Terminal 11 (home theater mode selector) is enabled.

When you power up the system from standby, the origin of the turn-on signal determines which mode of operation it will enter.

Video Mode

The mode selection of the Home Theater chassis uses a logic hierarchy. The system switches from standby or audio mode to home theater mode immediately if there is a signal at any home theater turn-on terminal, such as the following: - A 5 to 10 Vdc level at the Remote Turn-on Home Theater terminal at block 4. - An active audio signal at the Audio for Video Inputs at blocks 6 and 7. - A baseband video signal (video, blue screen or snow) at the Home Theater selector input at block 11.

The chassis will not switch back to audio mode until there are no longer any home theater mode turn-on signals present. For example, if the VCR is providing audio to the Left and Right Audio for Video Inputs at blocks 6 and 7 when you put the audio source into play, the system will not enter audio mode. It will not play the audio source until you turn the VCR off. If you turned on the system in home theater mode, you must remove whatever signal turned it on before you can revert to audio mode.

The Bose BUILT-INvisible home theater system is an audio system by default. It will play audio until you tell it to operate as a home theater. For example, if a CD changer is providing audio throughout the home and you connected its signal to terminals 17 and 18, the system will operate in audio mode. If any one of the three home theater mode turn-on signals listed above becomes active, the system will switch to home theater mode. When the system is in home theater mode: - The Left and Right Audio Inputs at blocks 17 and 18 are deselected.

- The Left and Right Audio for Video Inputs at blocks 6 and 7 are selected.
- The Videostage
surround processor is enabled.
- The chassis reads the voltage present at the Home Theater VCA Input terminal at block 2 to set the volume level. The surround encoded stereo audio signal connected to the audio for video inputs will decode into left, right, center and surround signals. The signals are routed as follows:

- Left and right front channels at blocks 24 and 23 play through Bose Spatial ControlTM satellites, Acoustimass-5 cube or Jewel Cube arrays.
- The center channel at block 21 plays through two Acoustimass-4 or Jewel Cube arrays.
- The surround channel at block 19 plays through two 102
-SE, 102-FR, 151RS or Model 32RS speakers.
- The Acoustimass bass module output at block 20 plays through one Acoustimass module.

Larger rooms may also use a second bass module at the Acoustimass module #2 output at block 22.

Audio Mode

The system is placed into audio mode by either of two signals:
- A 5 to 10 Vdc level at the audio mode Remote Turn-on terminal at block 12.
- An active audio signal at the Left and Right Audio Inputs at blocks 17 and 18.

When the system is in audio mode:
- The signal connected to the Left and Right audio inputs at blocks 17 and 18 plays through an

Acoustimass module and a pair of Spatial Control satellites or Acoustimass-5 cubes in two-channel stereo. Only the speakers connected to the Right and Left Front Satellite terminals at blocks 23 and 24 will play. The center channel and surround channel speakers do not operate in audio mode.
- The Videostage surround processor is disabled.
- The chassis reads the volume control connected to the Audio Mode Volume Control terminal at block 16 to set the volume.

Delay Disable

A jumper from the Delay Disable terminal at block 3 to Ground at block 1 defeats the four  minute time delay incorporated in the system. This time delay is to prevent the system switching from home theater mode to audio mode until four minutes have elapsed. This is to keep the system in home theater mode during the long audio silences in some movies. Placing a jumper from block 3 to block 1 disables this time delay, enabling instantaneous switching from home theater mode to audio mode.

Automatic Turn-on Inhibit Switch

A short placed across these terminals at block 9 will prevent the system from being turned on under any circumstances. This is also referred to as a "vacation switch" and is used to allow the amplifier to be turned off if the residence will be unoccupied for an extended period of time.

 

 

 

 
Norbern Electronics Inc.  6735 Earl Drive,  Colorado Springs, CO 80918

Phone: 719-550-5810,      E-mail: norm@norbern.com        Hours: Mon - Thur  9:00- 5:00   -  Fri 9:00 - 4:00 (mountain time)
 

Norbern Electronics Inc is not affiliated nor endorsed by Bose Corporation.
 Bose
, Wave, Acoustic Wave, Lifestyle, & Acoustimass are registered trademarks of Bose Corporation, All rights reserved.   Norbern Electronics Inc. 201
3-2016