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1 PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF
BOSE
® CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE
PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT BY AN
AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE
PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY
OTHER PURPOSE.
Contents
Safety Information ............................................................................................................................. 2
Electrostatic Discharge Sensitive (ESDS) Device Handling .......................................................... 3
Theory of Operation ...................................................................................................................... 5-8
Figure 1. Block Diagram ....................................................................................................................8
Disassembly/Assembly Procedures .......................................................................................... 9-11
Test Setup Procedure ..................................................................................................................... 12
402
® Test Procedures ................................................................................................................ 13-15
802® Test Procedures ................................................................................................................ 16-18
Part List Notes ................................................................................................................................. 19
Figure 2. 402, 802 II Original Version Exploded View .....................................................................20
Figure 3. 402, 802 II Current Version Exploded View ......................................................................20
Main Part List ............................................................................................................................. 21-22
402 Electrical Part List .............................................................................................................. 23-28
802 Electrical Part List ..........................................................................................................29-35
402 Electrical Part List ..........................................................................................................36-42
802 Electrical Part List ......................................................................................................... 43-48
402 and 802 Electrical Part List ............................................................................................ 49-50
Packaging Part List ......................................................................................................................... 51
Figure 4. Packaging Exploded View ................................................................................................51
Frequency Response Curves ................................................................................................... 52-64
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2 1. Parts that have special safety characteristics are identified by the symbol on
schematics or by special notes on the parts list. Use only replacement par ts that
have critical characteristics recommended by the manufacturer.
2. Make leakage current or resistance measurements to determine that exposed
parts are acceptably insulated from the supply circuit before returning the unit
to the customer. Refer to Par agraph 84 of UL 1270. Use the following checks to
perform these measurements:
A. Leakage Current Hot Check-With the unit completely reassembled, plug
the AC line cord directly into a 120V AC outlet. (Do not use an isolation
transformer during this test.) Use a leakage current tester or a metering
system that complies with American National Standards Institute (ANSI)
C101.1 Leakage Current for Appliances and Underwriters Laboratories
(UL) 1492 (71). With the unit AC switch first in the ON position, then in the
OFF position, measure from a known earth ground (metal water pipe,
conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket,
metal cabinet, screwheads, metallic overlays, control shafts, etc.), especially
any exposed metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 milliamp. Reverse the unit power
cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN
THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZ-
ARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO
THE CUSTOMER.
B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and
connect a jumper wire between the two prongs of the plug. (2) Turn on the
power switch of the unit. (3) Measure the resistance with an ohmmeter be-
tween the jumpered AC plug and each exposed metallic cabinet part on the
unit. When the exposed metallic part has a return path to the chassis, the
reading should be between 1 and 5.2 Megohms. When there is no return path
to the chassis, the reading must be infinite. If it is not within the limits specified,
there is the possibility of a shock hazard, and the unit must be repaired and re-
checked before it is returned to the customer.
SAFETY INFORMATION
