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The rules should oblige the seller to give the purchaser an operating instrucion of Bose 802c, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.
What is an instruction?
The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Bose 802c one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.
Unfortunately, only a few customers devote their time to read an instruction of Bose 802c. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
What should a perfect user manual contain?
First and foremost, an user manual of Bose 802c should contain:
- informations concerning technical data of Bose 802c
- name of the manufacturer and a year of construction of the Bose 802c item
- rules of operation, control and maintenance of the Bose 802c item
- safety signs and mark certificates which confirm compatibility with appropriate standards
Why don't we read the manuals?
Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Bose 802c alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Bose 802c, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Bose service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Bose 802c.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the Bose 802c item, and its use of respective accessory, as well as information concerning all the functions and facilities.
After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
1 © 1997 Bose Corporation Part Number 129292 REV 03 Service Manual 802C System Controller Original and SMD V ersion ® ® Units with serial numbers beginning with 100000 are the original 802C's. Units with serial numbers beginning with 200000 are the new SMD 802C's.[...]
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2 Contents Safety Information ............................................................................................................................ 3 Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 4 Specifications ..............................................................[...]
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3 SAFETY INFORMA TION 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 in[...]
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4 DEVICE HANDLING ELECTROST A TIC DISCHARGE SENSITIVE (ESDS) This unit contains ESDS devices. W e recommend the following precautions when repairing, replacing or transporting ESDS devices: • Perform work at an electrically grounded work station. • W ear wrist straps that connect to the station or heel straps that connect to conductive floor ma[...]
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5 SPECIFICA TIONS 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 selected) Input Impedance: Balanced input, 4k Ω Unbalanced input, 42k Ω Electronic Crossover Frequency: 18[...]
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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 crossover function and equalization curve for a given system application through use of a switching n[...]
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7 DISASSEMBL Y/ASSEMBL Y PROCEDURES Figure 1. Locking T ab Screw Location Note: Refer to the Figures (2 and 3) for the following procedures. 1. T op Cover Removal 1.1 Remove the four screws (two located at the rear of the unit and one located on each side of the unit) that secure the top cover to the chassis. 1.2 Lift the rear of the top cover slig[...]
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Figure 2. Original 802C PCB Exploded Vi ew Figure 3. SMD 802C PCB Exploded Vi ew 8[...]
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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, 500mV rms signal to the input of the 802C. 4.2 Reference a dB meter to the 802 AMP output jacks (while in the Bi-Amp mode). 4.3 Refer to the frequency response table below and verif[...]
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10 TEST PROCEDURES 4.4 Apply a 100Hz, 500mV rms 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. Noise T est 6.1 All noise measurements are ANSI A-weighted true rms, with the inputs shorted. 6.2 Re[...]
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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 critical for safety purposes. Failure to use a substitute replacement with the same safety characteristics as the rec[...]
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12 MAIN PART LIST Reference Designator Description Part Number Note J1, 3 CONNECTOR, XLR, INSERT 121823 J2, 4- 8 JACK, PHONE 121570 J 9 WAFER, 7PIN, (2461) 123237-07 J9 CONNECTOR, 7PIN (21458) 121970-07 J1 0 WAFER, 6PIN (2461) 123237-06 J10 CONNECTOR, 6PIN (21458) 121970-06 P1, 2 TEMINAL, FASTON 111262 3 T1 TRANSFORMER, 110/220V TRANSFORMER, 120V T[...]
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Figure 4. Main Parts Exploded View 13[...]
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14 ELECTRICAL PART LIST Resistors Reference Designator Description Part Number Note R1, 2 2.7k Ω , 1/4 Watt, 5% 117704- 1212725 R3, 4 3.3k Ω , 1/4 Watt, 5% 117704- 1213325 R5-7, 11, 15, 118, 218 160k Ω , 1/4 Watt, 5% 117704- 1211645 R8, 9, 12, 13, 16, 17, 101, 210, 104, 204 330k Ω , 1/4 Watt, 5% 117704- 1213345 R10, 14, 18 8.2k Ω , 1/2 Wa[...]
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15 ELECTRICAL PART LIST Resistors (continued) Reference Designator Description Part Number Note R144, 244 56k Ω , 1/4 Watt, 2% 117704- 1215632 R148, 248 4.12k Ω , 1/4 Watt, 1% 119976- 2214121 R149, 249 23.7k Ω , 1/4 Watt, 1% 119976- 2212372 R150, 250 30.9k Ω , 1/4 Watt, 1% 119976- 2213092 R160, 260 22k Ω , 1/4 Watt, 5% 117704- 1212235 SMD[...]
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16 ELECTRICAL PART LIST Capacitors Reference Designator Description Part Number Note C 1 .0047uF, 220V .0047uF, 1.4KV, 100/120V 120993 103447 3 C2, 3 . 015uF, FILM 118091-153 C 4 .01uF, CERAMIC DISC 119696-103 C5, 6 470uF, ELECTROLYTIC 110704 C7-10 1uF, ELECTROLYTIC 119942-1R0 C11-19, 22 .1uF, CERAMIC DISC 117502 C101, 117, 125, 201, 217, 225 22uF,[...]
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17 ELECTRICAL PART LIST Diodes T ransistors Integrated Circuits Reference Designator Description Part Number Note U1, 8, 9 QUAD OP AMP, LS-404 120535/192166 4 U 2 VOLT REG, 78L15 121116-1 U 3 VOLT REG, 79L15 121117-1 U4 QUAD NAND CD-4011 121854 U5, 6 QUAD OP AMP, RC4156 192166 4 U7, 10 QUAD AW. SW. CD4066 119837 Reference Designator Description Par[...]
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18 VOL T AGE CONVERSION INSTRUCTIONS 220 V olt to 1 10 V olt Conversion 1 10 V olt to 220 V olt Conversion 1. 220 V olt to 1 10 V olt Conversion Note: Conversions must be performed with the line cord disconnected from any power source. Refer to Figure 3 below for the following procedures. The jumpers listed in parentheses refer to the SMD units. 1.[...]
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Figure 6. T op Cover Connection Diagram 19[...]
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SPECIFICA TIONS AND FEA TURES SUBJECT TO CHANGE WITHOUT NOTICE ® ® Bose Corporation The Mountain Framingham Massachusetts USA 01701 P/N 129292 REV . 03 10/97 FOR TECHNICAL ASSIST ANCE OR P AR T ORDERS, CALL 1-800-367-4008[...]