Bose-500PM-spk-sm 电路图 维修手册.pdf

《Bose-500PM-spk-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Bose-500PM-spk-sm 电路图 维修手册.pdf（18页珍藏版）》请在收音机爱好者资料库上搜索。

1、Model 500PM Loudspeaker Service Manual 1998 Bose Corporation Part Number 197275 REV 00 RadioFans.CN 收音机爱 好者资料库 2 CONTENTS Electrostatic Discharge Sensitive (ESDS) Device Handling . 3 Warranty Information. 3 Specifications. 4 Theory of Operation, Model 500PM Loudspeaker SmartProtect Crossover PCB. 5

2、Disassembly/Assembly Procedures . 6-8 Figure 1. Model 500PM Loudspeaker Driver Wiring Diagram. 7 Test Procedures . 9 Figure 2. Model 500PM Loudspeaker Test Setup Diagram . 9 Main Part List, Model 500PM Loudspeaker (see Figure 3) . 10 Figure 3. Model 500PM Loudspeaker Exploded View . 11 Electrical Pa

3、rt List. 12-13 Packing List, Model 500PM Loudspeaker (see Figure 4) . 14 Figure 4. Model 500PM Loudspeaker Packing View . 14 Figure 5. Model 500PM Loudspeaker Crossover PCB Topside Component and Etch Layout Diagram. 15 Figure 6. Model 500PM Loudspeaker Crossover PCB Bottom Side Etch Layout Diagram .

4、 16 Figure 7. Model 500PM Loudspeaker SmartProtect Crossover Assembly Schematic Diagram. 17 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

5、CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE. CAUTION: The Model 500PM Loudspeaker contains no user serviceable parts. To prevent warranty infractions, refer servicing to warranty service centers or factory service. RadioFans.CN 收音机爱 好者资料库 Note: This

6、 manual has been updated using information from supplement 197275-S1. This affects part numbers for PTC1, PTC2 and PTC3. 3 (ESDS) DEVICE HANDLING ELECTROSTATIC DISCHARGE SENSITIVE This unit contains ESDS devices. We recommend the following precautions when repairing, replacing, or transporting ESDS

7、devices: Perform work at an electrically grounded work station. Wear wrist straps that connect to the station or heel straps that connect to conductive 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

8、or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap, or plastic trays. WARRANTY INFORMATION The Model 500PM Loudspeaker is covered by a 5-year transferable limited warranty.

9、RadioFans.CN 收音机爱 好者资料库 4 SPECIFICATIONS External Dimensions, Single Speaker, including grille:18.09L x 11.77D x 10.10H (45.95 x 29.90 x 25.65 cm) Weight:Packed Pair, 60lb (27.3kg) Shading Network Assembly:5.6uF capacitor with 0.13mH series inductor, 33uF capacitor with 0.5mH series inductor, 33uf c

10、apacitor with 3.9 parallel resistor and 0.8mH parallel inductor. Internal Cabinet Volume:19 Liters net Port (each side):Flared slot port tuned to 58Hz Impedance:6 nominal, 4.8 minimum from 20Hz to 20kHz Power Handling:200W (34.6Vrms) continuous per IEC-268-5. Sensitivity:85dB SPL 1W/1m, free-field,

11、per IEC-268-5 for octave band centered at 400Hz. SmartProtect: Turn on voltage of the transistors of the electronic switch:1.5-1.8Vrms Resistance prior to turn on:3 On resistance:0.2 Max audio voltage applied to speaker:70Vrms Maximum cont. sinusoidal current, 1Khz:3.6Arms 15% Maximum cont. sinusoid

12、al current, 150Hz: 5Arms 15% Reset time:200-400ms Time to trip, as a function of speaker current: DC turn-off current:5A Speaker Current I/I Time to Trip 3.31-5ms 30.8ms 22s 1.53s 1 5 THEORY OF OPERATION Model 500PM Loudspeaker SmartProtect Crossover PCB Note: Refer to Figure 7. Model 500PM Loudspea

13、ker SmartProtect Crossover Assembly Schematic Diagram, for the following explanation. The SmartProtect PCB is an electronic switch, in series with the speaker, used to protect the drivers from high current and power levels. It has a fast turn-on time of about 100 milliseconds. At turn-on, current fl

14、ows through R1, C1, D1, D2, C2, Q1, C3 and R18. Capacitors C2 and C3 form a virtual power supply which is used to power the SmartProtect circuit to provide the bias to FETs Q8 and Q9, limited by the Zener diode D6 to 10 V. Diodes D1 and D2 form a voltage doubler. Once C2 is charged, Q1 will conduct

15、and provide a charge path for C3. Once C3 is charged, if the input audio voltage becomes lower than 4V, Q1 will turn off, and the charge on C3 provides a voltage used to operate the circuit for up to 5 hours. PTC1 provides the current path if the speaker must play for a long time at very low volume

16、when input AC voltage to the speaker is less then 1.5V. Resistors R16 and R17 form the current sensor. It allows the circuit to sense the speaker current and protect it from the following types of the abuse: 1. DC offset - when too high a DC offset level is detected one, of the two transistors Q6 or

17、 Q7 will be turned on through resistor R19, thus tripping the monostable multivibrator Q2, Q3. 2. Fast DC/AC transients - works the same way for both transient polarities, threshold depends on the ratio of resistors R19 and R20. 3. Thermal overload - When the AC current is too high for a prolonged t

18、ime, transistor Q4 turns on through resistor R13, tripping the monostable multivibrator Q2, Q3. The time constant of current integration depends on C6, R13 while the time constant of “memory” is defined by R6 and C6. AC voltage divider R15, R14, and C7 defines the frequency dependent threshold of cu

19、rrent protection. The protection portion of the circuit works as follows: When monostable multivibrator Q2, Q3 is tripped, by one of the above conditions, transistors Q2 and Q3 turn on, reducing the gate voltage of Q8 and Q9 to zero, and shutting them off. At this moment the speaker load is disconne

20、cted from the amplifier. During the off cycle, capacitor C4 is charging through resistor R3, and when the charging is completed, Q2 and Q3 will shut off again, turning Q8 and Q9 back on, and allowing the speaker to operate again. If the overload condition persists, the monostable multivibrator will

21、trip the circuit again, and shut off the speaker again. Duty cycle depends on the current through the speaker. Troubleshooting 1. If PTC1 is open, the unit will not play at low volume levels (Vin1.5 V) when the system is first turned on, but as the volume is increased, the SmartProtect circuit will

22、turn on, and the speaker will operate. It will then operate for approximately 5 hours, until the charge on C3 is too low to keep the circuit running, and then the speaker will shut off again. 2. If either R18, R1, D2 is open, or D1 is shorted there will be no charge of the virtual power supply forme

23、d by C2 and C3, and the circuit will never turn on. The symptom will be that the speaker will play at low volume levels, but as the volume is turned up, the speaker will stop operating. This may also happen if for any reason Q7, Q8 or any other component in the circuit fails, and internal safety “wa

24、tchdog” C5 turns the Q3 on preventing the Q8 and Q9 from being overheated. Shading Network The shading network consists of one 5.6uF capacitor, one RXE040 PTC, and one 0.13mH inductor across the two front array drivers, one 33uF capacitor, one RXE040 PTC and one 0.5mH inductor across the driver near

25、est the port and a trap filter consisting of a 3.9 resistor, a 33uF capacitor, and a 0.8mH inductor. The inductors are iron core. 6 DISASSEMBLY/ASSEMBLY PROCEDURES Note: Refer to Figure 3. Model 500PM Loudspeaker Exploded View, for the following procedures. 1. Grille Removal 1.1 Using your fingers,

26、grasp the grille (14) edge nearest the curved end and gently pull the grille away from the cabinet until it comes free. 1.2 Grasp the opposite edge of the grille and gently pull it away from the cabinet until it comes free as well. 2. Grille Replacement 2.1 Align the two grille posts on the curved g

27、rille (14) edge with the cabinet grille socket grommets (5) located on the speaker cabinet curved section and press the grille edge into place. 2.2 Align the two grille posts at the opposite grille edge with the cabinet grille socket grommets and press the grille in place. The grille should be neat

28、and flush with the cabinet. 3. StarDriver Removal 3.1 Remove the grille (14) using procedure 1. 3.2 Remove the three screws (2 or 18) that secure the StarDriver (6) you wish to remove from the cabinet. Note: The StarDriver located on the angled portion of the baffle is secured using (2), the two Sta

29、rDrivers located on the plastic baffle are secured using (18). 3.3 Using your fingers, grasp the plastic basket of the StarDriver and pull gently. The StarDriver should come free. 3.4 Note the driver wiring color code, and cut the wires from the harness assembly (3) as close to the terminals as poss

30、ible. 4. StarDriver replacement 4.1 Observing polarity, solder the wires from the harness assembly (3) to the StarDriver (6) terminals. 4.2 Align the StarDriver correctly into the cabinet and secure it using the screws (2 or 18) removed in procedure 3.2. Do not overtighten the screws. 4.3 Replace th

31、e grille (14) using procedure 2. 5. Woofer Removal Note: In order to gain access to the woofers, you must first remove the array bezel on which the forward-firing StarDrivers are mounted. 5.1 Using a phillips-head screwdriver, remove the twelve screws (2) that secure the array bezel (12) to the loud

32、speaker cabinet. 5.2 Gently pull the array bezel away from the loudspeaker cabinet. Be careful not to break any wires. Slide the array bezel off to one side to allow access to the woofer assembly (11). 5.3 Remove the batting material located behind the array bezel. Retain it for replacement later. N

33、ote: In order to remove the woofer assembly located behind the rod, you must first remove the StarDriver located on the angled portion of the loudspeaker cabinet using procedure 3. It is not necessary to cut the StarDriver wires, as it can be moved out of the way to allow removal of the woofer. 5.4

34、Using a phillips-head screwdriver, remove the four screws (2) securing the woofer assembly to the loudspeaker cabinet. 7 DISASSEMBLY/ASSEMBLY PROCEDURES Figure 1. Model 500PM Loudspeaker Driver Wiring Diagram - + BLUE RED GREY WHITE GREEN YELLOW BROWN ORANGE PCB +-+- _ + WHITE GREY RED BLUE BLUE RED

35、 YELLOW GREEN BROWN ORANGE - + - + + - BLACKBLACK WOOFERWOOFER DRIVERDRIVER DRIVER Note: When removing the woofer assembly, it is not necessary to cut the black wire used to connect the dual voice coils in series. Refer to Figure 1. 5.5 Make a note of the wiring color code, and cut the blue and red

36、wires of the harness assembly (3) as close to the terminals as possible. 5.6 Once you have the woofer assembly out of the loudspeaker cabinet, remove the black wire used to connect the dual voice coils in the woofer assembly in series. Retain it for use on the replacement woofer assembly. 6. Woofer

37、Replacement 6.1 Using the wiring diagram, solder the blue and red wires to the correct terminals on the woofer assembly (11) to be replaced. Note: Be sure to replace the black wire used to connect the dual voice coils on the woofer assembly in series. 6.2 Align the woofer assembly (11) into the spea

38、ker cabinet, making sure that the woofer gasket (10) is located properly behind the driver. 6.3 Secure the woofer assembly to the speaker cabinet using the four screws (2) removed in procedure 5.4. 6.4 Replace the batting material removed in procedure 5.3. 6.5 Align the array bezel (12) so that the

39、tabs located on the sides of the array bezel are located toward the center of the speaker cabinet. 6.6 Secure the array bezel to the speaker using the twelve screws (2) removed in procedure 5.1. 8 DISASSEMBLY/ASSEMBLY PROCEDURES 8.2 Using the four screws (9) removed in procedure 7.5, secure the cros

40、sover assembly to the binding post connector. 8.3 Plug the speaker harness (3) connector onto the crossover assembly. 8.4 Gently slide the crossover assembly into the the speaker cabinet, taking care not to damage any components. Be sure that the black rubber bumper is installed into the center of t

41、he crossover assembly, and that it remains in place during this procedure. 8.5 Secure the binding post connector to the speaker cabinet using the four screws (2) removed in procedure 7.1. Do not overtighten the screws. 6.7 Replace the grille (14) using procedure 2. 7. Crossover Assembly and Binding

42、Post Connector Removal 7.1 On the rear of the speaker cabinet, use a phillips-head screwdriver to remove the four screws (2) that secure the binding post connector (7) to the cabinet. 7.2 Gently pull the binding post connector straight out of the speaker cabinet until you see the crossover assembly

43、(8). 7.3 Angle the binding post connector so that the crossover assembly can be pulled out through the opening on the rear of the speaker cabinet. Gently pull the crossover assembly out of the speaker cabinet. Be careful not to damage any components on the crossover assembly. Note: Be sure to retain

44、 the rubber bumper that is mounted in the center of the PCB. You will need to reinstall it with the crossover assembly. It is used to prevent vibration of the crossover assembly during loudspeaker operation. 7.4 Unplug the speaker harness (3) connector from the crossover assembly. 7.5 Use a phillips

45、-head screwdriver to remove the four screws (9) that secure the binding post connector to the crossover assembly. 7.6 Slide the crossover assembly straight off of the tabs on the binding post connector. 8. Crossover Assembly and Binding Post Connector Replacement 8.1 Slide the crossover assembly (8)

46、 onto the tabs located on the binding post connector (7). 9 Figure 2. Model 500PM Loudspeaker Test Setup Diagram Note: Refer to Figure 1. Model 500PM Driver Wiring Diagram, for the following procedure. 1. Phase Test 1.1 Remove the speaker grille using Disassembly/Assembly procedure 1. 1.2 Observing polarity, apply a