Bose 802c Service Manual

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Summary of Contents:

[Page 1] Bose 802c

1 © 1997 Bose Corporation Part Number 129292 REV 03 Service Manual 802C System Controller Original and SMD Version ® ® Units with serial numbers beginning with 100000 are the original 802C's. Units with serial numbers beginning with 20...

[Page 2] Bose 802c

2 Contents Safety Information............................................................................................................................ 3 Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................

[Page 3] Bose 802c

3 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 cha...

[Page 4] Bose 802c

4 DEVICE HANDLING ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) This unit contains ESDS devices. We recommend the following precautions when repairing, replacing or transporting ESDS devices: • Perform work at an electrically grounded work station. • ...

[Page 5] Bose 802c

5 SPECIFICATIONS Input C onnections: (per channel) O ne ( 1 ) balanced female XLR connector One (1) unbalanced 1/4" phone jack Output Connections: (per channel) Two (2) 1/4" phone jacks per channel (outputs used depend upon mode ...

[Page 6] Bose 802c

6 The 802 ® C System Controller is a sophisticated signal processing device which combines the functions of three equalizers, an automatic switching circuit, and an electronic crossover. The 802C system controller automatically selects the proper cr...

[Page 7] Bose 802c

7 DISASSEMBLY/ASSEMBLY PROCEDURES Figure 1. Locking Tab Screw Location Note: Refer to the Figures (2 and 3) for the following procedures. 1. Top Cover Removal 1.1 Remove the four screws (two located at the rear of the unit and one located on each ...

[Page 8] Bose 802c

Figure 2. Original 802C PCB Exploded View Figure 3. SMD 802C PCB Exploded View 8 ...

[Page 9] Bose 802c

9 TEST PROCEDURES 4. Bi-Amp Frequency Response Note: This test is performed with both the 802 AMP and the 302 AMP output jacks used at the same time. 4.1 Apply a 750Hz, 500mVrms signal to the input of the 802C. 4.2 Reference a dB meter to the 802...

[Page 10] Bose 802c

10 TEST PROCEDURES 4.4 Apply a 100Hz, 500mVrms signal to the input of the 802C. 4.5 Reference a dB meter to the 302 AMP output jacks (while in the Bi-Amp mode). 4.6 Refer to the frequency response table below and verify the response of the unit. 6...

[Page 11] Bose 802c

11 1. This part is not normally available from Customer Service. Approval from the Field Service Manager is required before ordering. 2. The individual parts located on the PCB are listed in the Electrical Part List. 3. This part is ...

[Page 12] Bose 802c

12 MAIN PART LIST Reference Designator Description Part Number Note J1, 3 CONNECTOR, XLR, INSERT 121823 J2, 4-8 JACK, PHONE 121570 J9 WAFER, 7PIN, (2461) 123237-07 J9 CONNECTOR, 7PIN (21458) 121970-07 J10 WAFER, 6PIN (2461) 123237-06 J10 CONNECTOR,...

[Page 13] Bose 802c

Figure 4. Main Parts Exploded View 13 ...

[Page 14] Bose 802c

14 ELECTRICAL PART LIST Resistors Reference Designator Description Part Number Note R1, 2 2.7kΩ, 1/4 Watt, 5% 117704- 1212725 R3, 4 3.3kΩ, 1/4 Watt, 5% 117704- 1213325 R5-7, 11, 15, 118, 218 160kΩ, 1/4 Watt, 5% 117704- 1211645 R8, 9, 12, 13, 16...

[Page 15] Bose 802c

15 ELECTRICAL PART LIST Resistors (continued) Reference Designator Description Part Number Note R144, 244 56kΩ, 1/4 Watt, 2% 117704- 1215632 R148, 248 4.12kΩ, 1/4 Watt, 1% 119976- 2214121 R149, 249 23.7kΩ, 1/4 Watt, 1% 119976- 2212372 R150, 250...

[Page 16] Bose 802c

16 ELECTRICAL PART LIST Capacitors Reference Designator Description Part Number Note C1 .0047uF, 220V .0047uF, 1.4KV, 100/120V 120993 103447 3 C2, 3 .015uF, FILM 118091-153 C4 .01uF, CERAMIC DISC 119696-103 C5, 6 470uF, ELECTROLYTIC 110704 C7-10 1uF,...

[Page 17] Bose 802c

17 ELECTRICAL PART LIST Diodes Transistors Integrated Circuits Reference Designator Description Part Number Note U1, 8, 9 QUAD OP AMP, LS-404 120535/192166 4 U2 VOLT REG, 78L15 121116-1 U3 VOLT REG, 79L15 121117-1 U4 QUAD NAND CD-4...

[Page 18] Bose 802c

18 VOLTAGE CONVERSION INSTRUCTIONS 220 Volt to 110 Volt Conversion 110 Volt to 220 Volt Conversion 1. 220 Volt to 110 Volt Conversion Note: Conversions must be performed with the line cord disconnected from any power source. R...

[Page 19] Bose 802c

Figure 6. Top Cover Connection Diagram 19 ...

[Page 20] Bose 802c

SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE ® ® Bose Corporation The Mountain Framingham Massachusetts USA 01701 P/N 129292 REV. 03 10/97 FOR TECHNICAL ASSISTANCE OR PART ORDERS, CALL 1-800-367-4008 ...