Test Procedure Setup - Bose FreeSpace 4400 Service Manual

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Owner's manual (70 pages)

Installation manual (12 pages)

Manual (20 pages)

Table Of Contents

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101

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107

Table of Contents

Equipment Requirements

•

400 MHz Pentium-based PC with a minimum of 256 MB of RAM and 50 MB of of

available hard drive space

•

4x CD-ROM drive

•

One of the following operating systems: Microsoft

•

800 x 600 display

•

The Bose

FreeSpace

•

An RS-232 serial cable, M/F with DB9 connectors

•

An oscilloscope

•

An audio signal generator similar to an Audio Precision ATS-1

•

A digital multimeter

•

Four 100 Ohm, 250 Watt load resistors

•

One 2 Ohm, 250 Watt load resistor

Test Strategy and Conditions

Verify the customer complaint. Read any applicable notes that came in with the unit. Then

power up the unit and attempt communication using the Bose Installer program. If successful,

examine the error log files to try to determine the nature of the failure.

The amplifier will be put into a known state for test by first updating the unit's microcode using

the Bose Installer program. This resets the unit, sets the EQ's and gains to the proper levels

and maps the Zone 1 input to Zones 1 – 4 at the outputs.

Note: Loading new host microcode will place the unit into the factory default condition and will

also erase the stored unit serial number.

Once the update is completed, the unit will need to be configured so that Zone 1 input is

mapped to the Zone 1 amplifier output, Zone 2 to Zone 2, etc. Once this is completed the

amplifier will be properly configured for test.

All AC audio measurements must be band limited to 30 kHz. AC power must be applied to the

4400 amplifier product variants as follows:

Product Code

040753

040754

040742

040755

040756

All audio inputs must be terminated with 600 Ohms. All line level outputs must be terminated

with 400 Ohms. All amplifier outputs must be terminated with 50 Ohms.