Bose-802-C-Version-Service-Manual 电路图 维修手册.pdf

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1、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 802Cs. Units with serial numbers beginning with 200000 are the new SMD 802Cs. 2 Contents Safety Information. 3 Electrostat

2、ic Discharge Sensitive (ESDS) Device Handling . 4 Specifications. 5 Technical Description . 6 Disassembly/Assembly Procedures . 7 Figure 1. Locking Tab Screw Location . 7 Figure 2. Original 802C PCB Exploded View. 8 Figure 3. SMD 802C PCB Exploded View . 8 Test Procedures . 9-10 Part List Notes. 11

3、Main Part List. 12 Figure 4. Main Parts Exploded View . 13 Electrical Part List. 14-17 Voltage Conversion Instructions . 18 Figure 5. Voltage Conversion Diagram . 18 Figure 6. Top Cover Connection Diagram. 19 3 SAFETY INFORMATION 1. Parts that have special safety characteristics are identified by th

4、e 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 retu

5、rning the unit to the customer. 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 m

6、etering 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, condui

7、t, 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

8、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

9、 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

10、 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. PROPRIETARY INFORMATION THIS DOC

11、UMENT 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. 4 DEVICE HANDLING ELECTROSTA

12、TIC 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. Wear wrist straps that connect to the station or heel straps that connect to conductiv

13、e floor mats. Avoid touching the leads or contacts of ESDS devices or PC boards even if properly grounded. Handle boards by the edges only. Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unpro- tected devices into materials such as plastic, polystyrene foam, cl

14、ear plastic bags, bubble wrap or plastic trays. CAUTION: THE 802C SYSTEM CONTROLLER CONTAINS NO USER-SERVICEABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICING TO WARRANTY SERVICE STATIONS OR FACTORY SERVICE. 5 SPECIFICATIONS Input Connections: (per channel) One (1) balanced female XLR conn

15、ector 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 Unbalanced input, 42k Electronic Crossover Frequency:180Hz (bi-amplified mode only) Maximum Output Level:4 Volts (

16、+12dB into 600, 50Hz-16kHz) Total Harmonic Distortion:Less than .02% at 1 Volt (0dB) Less than .2% at 8 Volts (18dB) Output Noise:Less than 20uV (-9dBV) A-weighted Power Requirements:120 Vac, 50-60Hz, 3.5 Watts 220 Vac, 50-60Hz, (European) 100 Vac, 50-60Hz, (Japan) Dimensions:1 3/4H x 10 W x 5 D (4.

17、4 x 25.4 x 12.7 cm) Weight:1.97 lbs (.895 kg) 6 The 802C 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

18、function and equalization curve for a given system application through use of a switching network operating in conjunc- tion with the units output jacks. In addition to signal routing based on equalization require- ments, the switching network indicates mode of operation on its front panel. The fron

19、t panel also includes high-cut and low-cut switches which decrease line output by 4dB at 55Hz and by 10dB at 16kHz. Sharp subsonic and ultrasonic band-limiting filters reduce power waste, stage noise, high-frequency instability, and interference. The 802C system controller retains the compact dimens

20、ions of its predecessor, the Bose 802E active equalizer, and fits into one space of a standard 19 equipment rack with the optional RMK-8 Rack Mount Kit. In an on-going process of manufacturing updates, as technology permits, Bose Corporation has begun using SMD (surface mount devices) components on

21、its 802C controller. The new SMD components are such a space saving feature that this new version permits us to elimi- nate the piggy-back PCB and place all electronics on one single printed circuit board. This manual will identify the different procedures, PCB layouts, and components where necessar

22、y. There is no difference in the operation or function between the original 802C and the 802C SMD units. TECHNICAL DESCRIPTION 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

23、 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 slightly and slide it forward until the front of the top cover is clear of the switches. 2. Top Cover Replacement 2.1 Align the fro

24、nt of the top cover with the switches and LEDs and slide the cover into place. 2.2 Secure the top cover into place. 3. 302EQ (piggy-back) PCB Removal Note: The original 802C has two PCBs. The following procedure will discuss the removal of the piggy-back PCB. Note: The piggy-back PCB does not need t

25、o be removed when removing the main PCB. 3.1 Perform procedure 1. 3.2 Locate the four plastic stand-offs (three are located in the corners of the PCB and one is located between C125 and C225). 3.3 With small needle-nose pliers, squeeze the retaining tab of each stand-off while gently lifting up on t

26、he PCB to release the lock. Grasp the PCB at the middle of each side and lift the PCB off of the connectors. 5.5 Lift the front of the PCB up slightly. Gently pull the PCB out while pushing on the center of the XLR jacks. 6. Main PCB Replacement 6.1 Carefully slide the PCB into the chas- sis while a

27、ligning the XLR jacks into their housing. 6.2 Lock the XLR jacks into place by inserting a small screwdriver into the small hole in the XLR jack and rotate the screw clockwise 1/8 turn. 6.3 Replace the 5 screws that hold the PCB into place in the chassis. 6.4 Perform procedure 2. 4.2 Perform procedu

28、re 2. 5. Main PCB Removal 5.1 Perform procedure 1. 5.2 Remove the 6 knurled nuts securing the input and output jacks to the chassis. 5.3 Remove the 5 screws that secure the main PCB to the chassis. 5.4 On the rear of the unit, at the XLR jacks there is a small hole with a locking screw inside (see F

29、igure 1). Insert a small flathead screwdriver into the hole and rotate the locking screw 1/8 turn counter- clockwise to release the locking tab. 4. 302EQ (piggy-back) PCB Replace- ment 4.1 Replace the piggy-back PCB (on the original 802C controller) by placing the board over the connectors and pushi

30、ng the board down onto the stand-offs. ? ? ? 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 AMP outp

31、ut jacks (while in the Bi-Amp mode). 4.3 Refer to the frequency response table below and verify the response of the unit. 3. 302 Passive Frequency Response 3.1 Apply a 750Hz, 500mVrms signal to the input of the 802C. 3.2 Reference a dB meter to the 302 AMP output jacks. 3.3 Refer to the frequency re

32、sponse table below and verify the response of the unit. 2. 802 Full Range Frequency Response 2.1 Apply a 750Hz, 500mVrms signal to the input of the 802C. 2.2 Reference a dB meter to the 802 AMP output jacks. 2.3 Refer to the frequency response table below and verify the response of the unit. Output

33、Jacks Inserted 802 Full Range Passive 2-Way Bi- AMP No Jacks Inserted OnOffOff Inserted into 802 AMP OnOffOff Inserted into 302 AMP OffOnOff Inserted into 802 and 302 AMP OffOffOn 1. Mode Indicator Test 1.1 Depending on the output jack configu- ration (see top cover diagram on page 17), equalization

34、 curves and output vary. You must test all modes of the 802C to assure proper operation. 1.2 Perform the test below to verify that the mode select operation is working properly. Note: You can insert one or both of the Full Range Frequence Response Table FrequencyOutputTolerance 55Hz+14.0dB 1.5dB 30H

35、z0dB 2.5dB 250Hz+2.7dB 1.2dB 750Hz0dB (reference) - 3kHz+2.3dB 1.5dB 7.5kHz+12.0dB 1.5dB 15kHz+16.9dB 1.8dB FrequencyOutputTolerance 55Hz-20.1dB 2.5dB 230Hz+2.6dB 1.8dB 750Hz0 dB (reference) - 15kHz+17.0dB 1.8dB FrequencyOutputTolerance 30Hz-8.8dB 2.5dB 55Hz+6.2dB 1.5dB 150Hz-3.2dB 1.5dB 250Hz+3.2dB

36、 1.8dB 750Hz0 dB (reference) - 3kHz0.9dB 1.5dB 15kHz+15.3dB 1.8dB Passive Frequency Response Table FrequencyOutputTolerance 55Hz+9.3dB 1.8dB 750Hz0dB (reference) - 15kHz+6.9dB 2.0dB Lo and Hi Cut Switch Response Table Note: Set both the Lo and Hi cut switches IN for the following response table. 802

37、 Bi-Amp Frequency Response Table output jacks into the unit for this test. LED Indicator Status 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 b

38、elow and verify the response of the unit. 6. Noise Test 6.1 All noise measurements are ANSI A-weighted true rms, with the inputs shorted. 6.2 Refer to the table below for the proper noise levels. 5. Distortion Test Note: Total harmonic distortion must be measured in all modes to assure proper operat

39、ion. 5.1 Apply a 750Hz, 5Vrms signal to the input of the 802C. 5.2 Refer to the table below for the distor- tion specification for the corresponding mode being tested. Note: For the Bi-Amp 302 reading the input signal should be a 100Hz, 5Vrms signal. FrequencyOutputTolerance 55Hz+3.7dB 1.5dB 100Hz0d

40、B (reference) - 230Hz-8.3dB 1.5dB 750Hz-25.8dB 2.5dB 302 Bi-Amp Frequency Response Table OutputFrequency.Distortion 802 Full Range 750Hz0.1% 302 Passive750Hz0.1% 802 Bi-Amp750Hz0.1% 302 Bi-Amp100Hz0.1% Distortion Table Noise Table OutputNoise 802 Full Range 20uV 302 Passive20uV 802 Bi-Amp20uV 302 Bi

41、-Amp10uV 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

42、replacement with the same safety characteristics as the recommended replacement part might create shock, fire and or other hazards. 4. RC-4156 is to be used ONLY as a replacement for U5 and U6. This replaces the selected LS-404 IC previously used in these locations. Due to the higher current needs o

43、f the RC-4156, DAMAGE could occur to the power supply if this IC is used in other locations on the PCB. 5. This part is used on the 220V variation only. PART LIST NOTES 12 MAIN PART LIST Reference Designator DescriptionPart NumberNote J1, 3 CONNECTOR, XLR, INSERT 121823 J2, 4-8JACK, PHONE121570 J9WAFER, 7PIN, (2461)123237-07 J9CONNECTOR, 7PIN (21458) 121970-07 J10WAFER, 6PIN (2461)123237-06 J10CONNECTOR, 6PIN (21458) 121970-06 P1, 2TEMINAL, FASTON1112623 T1TRANSFORMER, 110/220V TRANSFORMER, 120V TRANSFORMER, 100V 120993 121659-1 121824 3 I