Crown_XLS_1000,_1500,_2000,_2500_Service_Manual电路图.pdf

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1、XLS1000 2500 Service Manual 142195-1 4/10 RadioFans.CN 收音机爱 好者资料库 XLS3 Tech Support.doc XLS-3 MENU: The XLS main menu structure communicates functionality of the amplifier in terms of its input routing (MODE), filter selection (FILTER), and frequency of the filter (FREQ)when available. MODE: Amplifi

2、er audio routing. STEREO: Channel 1 input to Channel 1 output, Channel 2 input to Channel 2 output. BRIDGE: Channel 1 input to Channel 1, with the inverted Channel 1 input to Channel 2. By taking the two positive outputs of the amplifier, twice the output voltage (twice the power) is realized. In BR

3、IDGE mode, Crossover (XOVER) filters are not allowed since the same audio is required for both output channels. INPUT Y: Channel 1 input to both Channel 1 and Channel 2s processing and output. Switching occurs pre-pot and pre-filter. FILTER: Audio filtering. BYPASS: Both channels are full spectrum a

4、udio (20Hz 20KHz). In BYPASS mode, no FREQ choice is allowed. LOWPASS: Both channels are 4th order Linkwitz-Riley filters with frequency breakpoint determined by the FREQ choice. HIGHPASS: Both channels are 4th order Linkwitz-Riley filters with frequency breakpoint determined by the FREQ choice. Rad

5、ioFans.CN 收音机爱 好者资料库 XOVER: When XOVER is selected, the MODE choice is automatically changed to INPUT Y. Channel 1 is fed to both channels processing with Channel 1 being Lowpass and Channel 2 being Highpass. The crossover frequency is determined by the FREQ choice. CLIP COMPRESSOR: Allows the clip

6、compressor for each channel to be either turned on or off. The Clip compressor is a proprietary algorithm that limits clipping on a real-time basis. DIAGNOSTIC MENU: RadioFans.CN 收音机爱 好者资料库 A set of diagnostic menus can be accessed at anytime by pushing all three menu buttons at the same time. The a

7、mplifier continues to pass audio, but the diagnostic menus are displayed until the MODE/MENU button is pushed and normal amplifier functionality returns. MODEL R125 ) to improve stability margin. The feedback signal out of U101C is then further filtered by the 2nd harmonic (768KHz) trap comprised of

8、 R116/117/118/119 and C122/123/124. Passing through R115 we are back to the combining point of the input signal and the feedback which as stated earlier goes to the Ruby (U1) error amplifier. The Ruby signal path. Before the Ruby IC (U1) will pass a signal the STBY pin (17, 18) must be pulled high.

9、This line is an open collector output/input on Ruby so an external source can pull the pin low to inhibit PWM switching ( Q101 ) or the Ruby IC can pull the line low in case of a Ruby determined fault condition. This pin must be high for the Ruby to be enabled. The ruby error amplifier uses a triple

10、 integrated feedback (C116-121 and R109-111) to maximize the amount of feedback in the audio frequency range. R142 and C158 provide a high frequency load for the error amp to improve the internal opamp stability. Inside of the Ruby IC the resultant error signal is compared to the Ruby generated tria

11、ngle wave which creates the PWM signal used to drive the Output Stage. Ruby varies the amplitude of the triangle wave based on the Vcc voltage it senses through R7-10 which it also uses for an overvoltage protection circuit. U2-B is a buffer/filter for the Ruby Reference Voltage called VR on the sch

12、ematic. This VR signal connects directly to the Ruby error amp and must be highly filtered to reduce noise injected into the feedback. The Output Stage. The PWM signal from Ruby ( pin 54 ) drives the gate drive IC (U102). The transistors Q102 and Q109 use the PWM signal to determine if the gate driv

13、e IC should be enabled and will only enable U102 if there is a valid PWM signal coming from Ruby. U102 does several functions. First it translates the signal from the ground referenced signal that Ruby provides to signals capable of driving the MOSFETs that are referenced to Vcc (Q104) and to the sw

14、itching node (Q103). This drive signal is buffered by Q110-113 in order to provide adequate current to drive the MOSFETs. U102 has programmable dead-time which can be changed by the APM through a programming current drive into Q107-108. U102 provides current limit protection for the MOSFETs. R153-15

15、4 set the negative current limit and R158-159 set the positive current limit. U102 provides under-voltage protection for the MOSFETs to protect against low gate drive voltage. U102 is supplied 12V for the low side drive from the gate supply powered from the LVAC winding on the transformer and is reg

16、ulated to 12V by U3. The output PWM from the MOSFETs is filtered by L101 and a series of capacitors as shown on the schematic. Further reduction of the switching frequency ripple is achieved by the 384KHz trap consisting of C147/173 and L102. L102 is tuned for minimum ripple at the output terminals.

17、 From the output filter the signal passes through a relay (K101) before going to the output terminals. The relay is controlled by the APM and is enabled after the power on self test has passed. Ruby control circuits. The Ruby IC is placed in slave mode and in order for Ruby to function it must be pr

18、ovided a clock signal on pins 5 and 6. This is a 384KHz signal that is provided by the APM. It must be powered by 5VDC at pins 29,30,38 and 59. Pins 12 and 13 provide I2C communications with the APM. The Ruby IC has several ADC channels that the APM reads and uses to control the operation of the amp

19、lifier. These inputs are all referenced to the VREFSAR internal voltage reference which is buffered by U2A. RT1 is a temperature sensor (NTC) placed under the Secondary Diode heatsink and is connected to pin 19. This temperature is then read by the APM and used to limit the temperature in case of a

20、fault. RT101 is a temperature sensor (NTC) placed under the Channel 1 heatsink and is connected to pin 53. This temperature is then read by the APM and used to limit the temperature in case of a fault. RT201 is a temperature sensor (NTC) placed under the Channel 2 heatsink and is connected to pin 52

21、. This temperature is then read by the APM and used to limit the temperature in case of a fault. As mentioned before a scaled version of the +/-Vcc levels are connected to pins 20 and 21. These signals can be queried by the APM and also will shut down the PWM signal in case of an overvoltage on the

22、Vccs. A scaled version of the output signal is also provided to the Ruby (pins 22 and 24) and is available to the APM. The LVAC signal is rectified and provided to pin 23 for the APM and is used to display line voltage and provide under voltage and overvoltage protection in case the line voltage is

23、out of bounds. R13 programs the current applied to the Ch1 and Ch2 temperature sensors. Pins 15 and 16 provide a signal informing the APM that a clip event has occurred. It will be triggered by either a voltage limit or current limit event. R22/23/24 provides a way for the APM to know what model of

24、amplifier it is connected to. See the chart below. XLS 2000/2500 Amplifier Theory of operation. The XLS2000 and XLS2500 are very similar to the XLS1000/1500 and so only the differences will be discussed here. XLS 2000/2500 Output Stage. There are value differences of some of the resistors and capaci

25、tors but the main difference in the amplifier section, between the 1000/1500 and the larger 2000/2500, is in the output stage topology. Were the 1000/1500 uses the MOSFET body diode to carry the current to the Vcc supplies when the MOSFET is turned off, the 2000/2500 uses diodes D108, 109 to block t

26、he current and force it though the anti-parallel diodes D105, 106. This improves the efficiency of the amplifier. The rest of the amplifier circuits are the same as the smaller amplifiers. The APM determines the model and voltage rating of the amplifier by the values of R22, 23 and R24. Below is a c

27、hart showing the values for each model. Model Voltage Part Number R22 R23 R24 XLS1000 100V 141576 Open 10K 1.1K XLS1000 120V 141577 Open 10K 2.49K XLS1000 220V 141578 Open 4.99K 2.49K XLS1000 240V 141579 Open 4.99K 4.99K XLS1500 100V 141580 Open 2.49K 4.99K XLS1500 120V 141581 Open 2.49K 10K XLS1500

28、 220V 141582 Open 1.1K 10K XLS1500 240V 141583 Open 10 Open XLS2000 100V 141607 20K 15K Open XLS2000 120V 141608 20K 20K Open XLS2000 220V 141609 15K 20K Open XLS2000 240V 141610 1.1K 2K Open XLS2500 100V 141603 10K 1K Open XLS2500 120V 141604 10K 2K Open XLS2500 220V 141605 20K 6.81K Open XLS2500 2

29、40V 141606 20K 10K Open PWR SUPPLY SECTION THEORY OF OPERATION Note: Any component references will be to the 141576-4 thru 141583-4, 141607-5 thru 141610-5, and 142028-3 thru 142031-2 PWAs. Later PWAs should be compatible except where additions have been made. Underlined text references components t

30、hat are only used on 141607-5 thru 141610-5, and 142028-3 thru 142031-2 PWAs. Brief summary of operation The power supplies of the XLS series of amplifiers are efficient and light weight, but yet extremely robust switchmode designs. The topology of the main supply employed is a half-bridge series re

31、sonant converter. The use of this topology allows for soft switching of the main semiconductors Q903 and Q906 reducing dissipation at idle and throughout the operating power range. Two other buck derived switching power supplies are employed. One serves as a bias supply for the main power supply and

32、 the other generates the +5V from the low voltage output of the main supply Front end This power supply is equipped with an internal EMI filter that both reduces the transfer of power supply related noises onto the power line, and improves the power supplies immunity from voltage transients on the p

33、ower line. The AC line voltage is converted to DC by a bridge rectifier D901. 120Vac and 100Vac models use voltage doubler, while 220V and 230-240Vac models use a full wave rectifier. Z901 determines this operating mode. It is present on the 120Vac and 100V models, and is open on the 220V and 230-24

34、0Vac models When switch S901 is closed the bulk storage capacitors C911, C912, C955, and C956 begin charging thru the PTC (RT901). This PTC limits the inrush current, eliminating circuit breaker trips at turn on. After the charging cycle is complete the soft start relay (K901) bypass the PTC. Bias S

35、upply The main supplys integrated control IC LCD_PWM THRU 1K (OPERATING V FOR LCD) 4 LCD_RS 5 LCD_RW 6 LCD_EN 7 $1837; DB0; TIED LOW TO DGND 8 $1836; DB1; TIED LOW TO DGND 9 $1839; DB2; TIED LOW TO DGND 10 $1838; DB3; TIED LOW TO DGND 11 LCD_D4 12 LCD_D5 13 LCD_D6 14 LCD_D7 15 $1830; LCD BACKLIGHT A

36、NODE (A) TO +5VD THRU 100 OHMS 16 LCD BACKLIGHT CATHODE (K) TO DGND Table 1: LCD header signals The flowchart in Figure 3, below, walks through troubleshooting LCD issues beginning with the error code explained above. If identified as error code 0 x11, the pins on the LCD need to be looked at with t

37、he scope according to the order in the flowchart. A scope set with 2 V/div and 5 sec/div should be able to capture the toggling on the lines identified in the flowchart. As a reference, examples of the scope displaying toggling bits on different lines can be seen in Figures 4-6, below. The unit in t

38、he example displayed toggling on the LCD_EN, LCD_RW, and data lines but NOT on the LCD_RS line, therefore it was concluded and verified that something was wrong with the LCD_RS line. In this particular case, the microcontroller (U706) pin 51 was not soldered. Figure 3: Flowchart for troubleshooting

39、LCD issues Figure 4: Toggling on LCD_EN ERROR CODE 0X12? BAD U706 (MICROPROCESSOR) INTERMITTENT CONNECTION LCD_EN (LCD PIN6) TOGGLE? OPEN/SHORT U706 PIN 53 LCD_RW (LCD PIN5) TOGGLE? LCD_D4-D7 (LCD PINS 11-14) TOGGLE? LCD_RS (LCD PIN4) TOGGLE? BAD LCD Y N Y Y Y Y N N N N N Y OPEN/SHORT U706 PIN 52 OP

40、EN/SHORT U706 PINS 33-36 OPEN/SHORT U706 PIN 51 ERROR CODE 0X11? Figure 5: Toggling on LCD_RW Figure 6: Toggling on data line After determining the issue to be with a pin on the microcontroller U706, care must be taken to remove the LCD and identify the issue. Most likely there will be an unsoldered

41、 pin or shorted pins on the micro. There is a smaller chance there could be a broken path between the pins on the micro and the LCD header. The layout of the U706 is shown in Figure 7, below. A portion of the schematic around U706 is also provided for reference in Figure 8, below. U706 is a 64 pin L

42、QFP. Figure 7: Microcontroller (U706, 64 pin LQFP) layout Figure 8: U706 portion of schematic PIN1 PIN51 (LCD_RS) PIN33 (LCD_D4) U706 LCD PINS LCD_EN53 LCD_RW52 LCD_RS51 LCD_D736 LCD_D635 LCD_D534 LCD_D433 U706 LCD PINS LCD_EN53 LCD_RW52 LCD_RS51 LCD_D736 LCD_D635 LCD_D534 LCD_D433 APPENDIX C: XLS-3

43、 PWA/PWB REFERENCE: ASSEMBLIES: Model New Description XXLS1000-0-US XLS 1000W AMP W/ XOVER & LIMTR 120V XXLS1000-2-EU XLS 1000W AMP W/ XOVER & LIMTR 220V XXLS1000-2-US XLS 1000W AMP W/ XOVER & LIMTR 220V XXLS1000-34-EU XLS 1000W AMP W/ XOVER & LIMTR 230-240V XXLS1000-34-UK XLS 1000W AMP W/ XOVER & L

44、IMTR 230-240V XXLS1000-34-IN XLS 1000W AMP W/ XOVER & LIMTR 230-240V XXLS1000-34-AU XLS 1000W AMP W/ XOVER & LIMTR 230-240V XXLS1500-0-US XLS 1500W AMP W/ XOVER & LIMTR 120V XXLS1500-2-EU XLS 1500W AMP W/ XOVER & LIMTR 220V XXLS1500-2-US XLS 1500W AMP W/ XOVER & LIMTR 220V XXLS1500-34-EU XLS 1500W A

45、MP W/ XOVER & LIMTR 230-240V XXLS1500-34-UK XLS 1500W AMP W/ XOVER & LIMTR 230-240V XXLS1500-34-IN XLS 1500W AMP W/ XOVER & LIMTR 230-240V XXLS1500-34-AU XLS 1500W AMP W/ XOVER & LIMTR 230-240V XXLS2000-0-US XLS 2000W AMP W/ XOVER & LIMTR 120V XXLS2000-2-EU XLS 2000W AMP W/ XOVER & LIMTR 220V XXLS20

46、00-2-US XLS 2000W AMP W/ XOVER & LIMTR 220V XXLS2000-34-EU XLS 2000W AMP W/ XOVER & LIMTR 230-240V XXLS2000-34-UK XLS 2000W AMP W/ XOVER & LIMTR 230-240V XXLS2000-34-IN XLS 2000W AMP W/ XOVER & LIMTR 230-240V XXLS2000-34-AU XLS 2000W AMP W/ XOVER & LIMTR 230-240V XXLS2500-0-US XLS 2500W AMP W/ XOVER

47、 & LIMTR 120V XXLS2500-2-EU XLS 2500W AMP W/ XOVER & LIMTR 220V XXLS2500-2-US XLS 2500W AMP W/ XOVER & LIMTR 220V XXLS2500-34-EU XLS 2500W AMP W/ XOVER & LIMTR 230-240V XXLS2500-34-UK XLS 2500W AMP W/ XOVER & LIMTR 230-240V XXLS2500-34-IN XLS 2500W AMP W/ XOVER & LIMTR 230-240V XXLS2500-34-AU XLS 25

48、00W AMP W/ XOVER & LIMTR 230-240V PWAs: 141576-x PWA, XLS1000 100V AMP/PS 141577-x PWA, XLS1000 120V AMP/PS 141578-x PWA, XLS1000 220V AMP/PS 141579-x PWA, XLS1000 240V AMP/PS 141673-x PWA, XLS DISPLAY 1000 141580-x PWA, XLS1500 100V AMP/PS 141581-x PWA, XLS1500 120V AMP/PS 141582-x PWA, XLS1500 220

49、V AMP/PS 141583-x PWA, XLS1500 240V AMP/PS 141607-x PWA, XLS2000 100V AMP/PS 141608-x PWA, XLS2000 120V AMP/PS 141609-x PWA, XLS2000 220V AMP/PS 141610-x PWA, XLS2000 240V AMP/PS 142028-x PWA, XLS2500 100V AMP/PS 142029-x PWA, XLS2500 120V AMP/PS 142030-x PWA, XLS2500 220V AMP/PS 142031-x PWA, XLS2500 240V AMP/PS 141558-x PWA, XLS DISPLAY 1500/2000/2500 PWBs: 141557-3 PWB, XLS DISPLAY 141574-3