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CONTENTS
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.
CAUTION: The ACM-1 Amplifier Control Module contains
no user serviceable parts. To prevent warranty infractions,
refer servicing to warranty service centers or factory service. Safety Information ............................... 3
Electrostatic Discharge Sensitive (ESDS) Device Handling ........... 4
Warranty Information .......................... 4
Figure 1. ACM-1 Audio Section Block Diagram ................5
Figure 2. ACM-1 Monitoring Section Block Diagram .................6
Theory of Operation ............................... 7-10
Disassembly/Assembly Procedures .................... 11-12
Figure 3. Input Module Screw Removal.....................11
Figure 4. ACM-1 Default Switch Settings ..........................11
Figure 5. 1800VI Ribbon Cable Connector Location (ACM-1 J8 to 1800VI J2) ......11
Figure 6. ACM-1 J1 Ribbon Cable Connection .........................12
Test Procedures ......................................... 13-19
Table 1. ACM-1 Input, Output, and Power Connections ..................13
Table 2. PS71 Power Supply List .......................................13
Figure 7. ACM-1 Switch Settings ..................................14
Figure 8. 1800VI Rear Panel Switch Settings .............................14
Figure 9. ACM-1 Graphical User Interface Control Panel ............................15
Table 3. Amplifier Output Performance Tests ..........................16
Test Cable Construction ............................................... 19
Part List Notes ..................................................... 19
Main and Packaging Part list, ACM-1 Amplifier Control Module (see Figure 10) .............. 20
Figure 10. ACM-1 Amplifier Control Module Exploded View ............................20
Electrical part list ........................................................... 21-25
Figure 11. Daughterboard Topside Etch Layout Diagram ................................26
Figure 12. Daughterboard Internal Etch Layout Diagram ................................26
Figure 13. Daughterboard Bottom Etch Layout Diagram .......................26
Integrated Circuit Pinout Diagrams ................................. 27-29
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SAFETY INFORMATION
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 parts 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. Use the following checks to perform these measurements:
A. Leakage Current Hot Check
(1) 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).
(2) With the unit AC switch first in the ON position and 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.
(3) Any current measured must not exceed 0.5 milliamp.
(4) Reverse the unit power cord plug in the outlet and repeat test.
ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN
INDICATE A POTENTIAL SHOCK HAZARD 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 between 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 rechecked
before it is returned to the customer.
