Primare-A32-pwr-sm 电路图 维修手册.pdf

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1、 PRIMARE A32 Power Amplifier Service Manual RadioFans.CN 收音机爱 好者资料库 1. Technical Description. 2. Error codes. 3. Bias Adjustment. 4. Schematics. 5. Technical Specifications. Confidential ! This document is not allowed to show for third part without written permission from Primare Systems AB. This do

2、cument is subject to change without notice. Author: Bjorn Holmqvist Primare Systems AB RadioFans.CN 收音机爱 好者资料库 A32 Functional Description Features The Primare A32 power amplifier is a fully balanced design, this means that the negative speaker terminals are active, not ground as on an unbalanced des

3、ign. When performing measurements, test equipment (such as Audio Precision) that can handle balanced amplifiers must be used. The input impedance is 15K and the gain is 26dB. It is possible to obtain just above 250 undistorted watts at an 8R load (both channels driven). The frequency response are fl

4、at, the A32 will drop down only -2dB at 100Khz. Standby The A32 is equipped with two standby modes, where standby mode 2 is the power save mode. In power save mode only the standby circuit will be powered by the small standby transformer placed on the digital PCB. Digital control and monitoring When

5、 power is first applied and the standby button on the front panel are pressed down the A32 are going to initiate the startup sequence. Relay K1 will be turned on where after a small delay will follow before relay K2 goes active to disable the inrush limiters. At the same time bias are turned on by s

6、hutting down the voltage supplied to the optocouplers on the amplifier channels. After a 20 second startup delay for the amplifier to settle down the speaker relays are turned ON. During the startup sequence all safety parameters such as DC-offset and fuses will be monitored, if an error is spotted

7、the amplifier will refuse to start and the standby LED will flash rapidly to indicate that an error has occurred. The error code can be read out by pressing the error check switch (SW1). Description of the error codes can be found on the next page. If the standby switch is pressed when the amplifier

8、 is in operate mode it will go to standby mode 1, which means that bias and speaker relay will be switched off. The standby LED is going to half light intensity to indicate that the amplifier is in this standby mode. If the standby button are pressed down for more than one second the amplifier are s

9、hutting down into standby mode 2 which means that bias, speaker relay and the two power relays K1, K2 are switched off. Only the standby circuit is still powered consuming just a few watt of energy. Temperature protection When temperature has reached 70 centigrade at the temperature sensors the spea

10、ker relay and bias are going to be switched off, when the temperature have decreased 10 centigrade the A32 are going to be restarted. In practice this will mean that the warmest part of the heatsink will be around 75-80 centigrade when over- temperature protection cuts in. RadioFans.CN 收音机爱 好者资料库 Ge

11、neral Protection During operation mode DC-offset, fuse, temperature and AC-loss are constantly monitored, any abnormal function from these will immediately disengage the speaker relay and the standby LED will start to flash rapidly indicating that an error has been spotted. The error code can be che

12、cked by pressing the error check button (SW1), if more than one error at the same time a repeated press of the button will display the next error. DC-offset and over temperature will automatically resume to normal operation after a delay if the error recovers. Fuse error will not (latch), here the a

13、mplifier must be turned off and the fuses replaced before normal operation is possible. Trigger. If a 3.5mm teleplug are connected to the left trigger input (the right connector is the output) the function of the standby button are being changed to only be able to turn the amplifier into standby mod

14、e 2 directly. The standby button cannot turn the amplifier on while the trigger is connected (trigger mode enable). The circuit will trigger at 2.5V and are highly immune against disturbances. The trigger are only able to control the amplifier between operate and standby mode 1. RS232 The RS232 port

15、 can be used for firmware upgrading as well as controlling by Crestron compatible RS232 codes. Fuses Due to the large capacitance of the electrolytics bank, turn off the mainspower and wait minimum 15minutes before replacing a blown fuse. Make sure to replace a blown fuse with exactly the same type

16、and value. Error codes LED Nr 3 2 1 Error 0 0 0 All OK 0 0 1 DC L+ 0 1 0 DC L- 0 1 1 DC R+ 1 0 0 DC R- 1 0 1 Fuse Rch 1 1 0 Fuse Lch 1 1 1 Overheated Bias Adjustment Critical for the adjustment are that the mainsvoltage is 230V or 120V exactly. The temperature in the facility must be constant during

17、 the adjustment procedure. Use the Bias test points and potentiometers (R1, R2) to adjust bias on each channel. The lower potentiometer is accessible thru a hole in the bottom of the amplifier. Bias test points Compare the voltage drop over all of the emitter resistors. These steps describe the Bias

18、 adjustment procedure, which is the same for both L& R channels. 1. Switch the amplifier on or if it has been on burn-in (test), disconnect input signal and loads. The A32 amplifier must be in operate mode, bias will be switched off in standby. 2. Let the amplifier run for 1h, without input signal.

19、3. Adjust the bias to 17mV measured on JP3, JP4 or JP2, JP1. 4. Check the maximum difference (voltage drop) over emitter resistors (R241, R243, R245, R247, R239, R237, R235, R233, R240, R238, R236, R234, R242, R244, R246, R248). The difference between them should not exceed 7mV. Higher difference mi

20、ght be due to a faulty transistor or Emitter resistor, also check and that the screw are tightened. 5. Wait 1h. 6. Measure the bias and if needed readjust to 17mV measured on JP3, JP4 or JP2, JP1. 7. Wait 1h. 8. Measure the bias and if needed readjust to 17mV measured on JP3, JP4 or JP2, JP1. 9. Wai

21、t 1h. 10. Measure the bias and if needed readjust to 17mV measured on JP3, JP4 or JP2, JP1. Repeat step 5-9 until the bias are stabile. 12345678 A B C D 87654321 D C B A Title NumberRevisionSize A3 Date:14-Nov-2005Sheet of File:C:WORK.P2005-3D.SCHDrawn By: C42200U/25V S1 T500mA D12 BRIDGE1 1 2 3 4 5

22、 6 7 8 9 10 J1 CON10 Bias L SPK Relay L XLR/RCA L +15V L Temp1 L Temp2 L GND L Fuse L DC-Check+ L DC-Check- L 1 2 3 4 5 6 7 8 9 10 J2 CON10 Bias R SPK Relay R XLR/RCA R +15V R Temp1 R Temp2 R GND R Fuse R DC-Check+ R DC-Check- R R5 0R R6 0R R7 536R R8 560R R9 2K2 R21 510R R24 10R R26 4K7 R33 2R2 R34

23、 2R2 SW BAL/UNBAL Q1 BCV46 R10 2K2 R25 2K2 C1+ 1 V+ 2 C1- 3 C2+ 4 C2- 5 V- 6 T2OUT 7 R2IN 8 R1IN 13 R1OUT 12 R2OUT 9 VCC 16 GND 15 T1OUT 14 T2IN 10 T1IN 11 U2 MAX3232ECAE 1 2 3 4 P2 HEADER 4 1 2 3 F1 NMF40 1 2 3 F2 NMF40 C8 100N C9 100N C10 100N C11 100N C12 100N +3.3V RS232 NO1 1 N02 8 C1 2 C2 7 NC

24、1 3 NC2 6 COIL 4 COIL 5 K1 RELAY DPDT3 78 6 3 2 5 4 1 D1 KB2855 R37 NTC 7R R38 NTC 7R R39 NTC 7R NO1 1 N02 8 C1 2 C2 7 NC1 3 NC2 6 COIL 4 COIL 5 K2 RELAY DPDT3 240V 120V Q2BCV46 R11 470R Q4BCV46 R12 470R D2 BDY17D D3 BDY17D P2.0/ICB/DAC0/ADC03 1 P2.1/OCD/AD02 2 P0.0/CMP2/KBI0/AD01 3 P1.7/OCC/AD00 4

25、P1.6/OCB 5 P1.5/RST 6 VSS 7 P3.1/XTAL1 8 P1.0/TXD 18 P0.5/CMPREF/KBI5 22 VDD 21 P0.1/CIN2B/KBI1/AD10 26 P0.3/CIN1B/KBI3/AD12 24 P0.6/CMP1/KBI6 20 P0.2/CIN2A/KBI2/AD11 25 P1.1/RXD 17 P3.0/XTAL2/CLKOUT 9 P1.4/INT1 10 P1.3/INT0/SDA 11 P1.2/T0/SCL 12 P2.5/SPICLK 16 P0.4/CIN1A/KBI4/AD13 23 P2.2/MOSI 13 P

26、2.3/MISO 14 P2.7/ICA 28 P0.7/T1/KBI7 19 P2.4/SS 15 P2.6/OCA 27 U3 P89LPC935 R13 10K R14 10K R1510K R1610K R2710K R28 10K C13 100U/6.3V C14 100U/6.3V C15 100U/6.3V C16 100U/6.3V +3.3VD X2 4MHZ C17 10p C18 22p SER 14 SRCLK 11 SRCLR 10 RCLK 12 E 13 O0 15 O1 1 O2 2 O3 3 O4 4 O5 5 O6 6 O7 7 Q7 9 VCC 16 G

27、ND 8 U5 74LVC595 +3.3VD R29 3K3 R30 3K3 R31 3K3 D9 LED D10 LED D11 LED R40 412R R41 110R +3.3VD C22 100N D4 LL4148 D5 LL4148 R32 4K7Q5 BC846 4 2 3 1 SW1 SW-B3 R18 10K +3.3VD Check error +3.3V D6 LL4148 D7 LL4148 C23 100N 1 2 3 4 5 6 7 8 9 10 J3 CON10 1 2 3 4 5 6 7 8 9 10 J4 CON10 S2 NC 1 2 3 S3 SW-S

28、PDT +3.3V Standby mode R19 4K7 +3.3V +3.3VD +3.3VD R42 470K C24 330N D8 LL4148 +3.3VD 1 2 3 4 P5HEADER 4 SW2 R20 1K PIN4 ON P5 PIN3 ON P5 PIN2 ON P5 PIN1 ON P5 PCB 2 PCB3PCB4 P6 PLUG P7 PLUG C1 47nF/275V X2 C2 47nF/275V X2 P1 PLUG P3 PLUG P4 PLUG P8 PLUG P9 PLUG P10 PLUG 1 8 15 13 9 11 4 5 T1 TRANSF

29、53X44 16 2 3 5 4 SW3 SW120-240 240V To mains Transformer C19 100N C20 100N C25 10N R43 10R C26 100U/25V J5 PHONEJACK STEREO SW J6 PHONEJACK STEREO SW C27 100N R44 10R C28 47u/16V R1 2K2 R2 NC R3 NC Q6 BC846 Q7 BC846 R4 4K7 R22 4K7 +3.3VD R23 10K R45 10K R46 10K Q3 BCV46 R47 10K C29 100U/6.3V C30 100

30、U/6.3V Vin 3 ADJ 1 Vout 2 U4 LD1085V33 C31 100nC32 100n C33 100U/6.3V +3.3VD +3.3VD D13 LL4148 D14 LL4148 D15 LL4148 D16 LL4148 D17 LL4148 D18 LL4148 D19 LL4148 D20 LL4148 D21 LL4148 D22 LL4148 D23 LL4148 D24 LL4148 12345678 A B C D 87654321 D C B A Title NumberRevisionSize A2 Date:7-Dec-2005 Sheet

31、of File:C:WORK.P2005-8C.SCHDrawn By: Q1 2SC2240 Q9 2SA970 Q13 BD677A Q15 2SC5171 Q66 2SA1930 R1 1K Q69 2SA1943 Q77 2SC5200 R3 33K R7 10K R11 110R R13 470R D1 1N4148 D2 1N4148 C1 0.1U R31 5K6 R32 5K6 R35 5K6 R40 3K3 Q10 2SA970 R42 15K R43 12K C14 22PF Q2 2SC2240 Q3 2SC2240 Q4 2SC2240 R46 133R R48 1K5

32、 R14 470R R207 1K R209 22K C84 39P D3 1N4148 D4 1N4148 C2 0.1U R15 470R R213 220R R217 100R R16 470R R221 4K7 R222 4K7 R223 4K7 R229 470K A 1 K 2 C 4 E 3 Q85 OPTOISO1 1 2 3 Q87 BS107 R214 330R R231 680R R224 2K2 R49 1K1 Q17 2SC5171 R17 56R R18 56R C4 0.1U C86 220U/16V R19 220R R20 220R R233 0.22R R2

33、34 0.22R R249 22R R250 22R R251 22R R252 22R Q70 2SA1943 Q78 2SC5200 R235 0.22R R236 0.22R R253 22R R254 22R R255 22R R25622R S1 6.3A S2 6.3A C88 100N C89 100N R210 22K R283 1K C5 0.1U C90 1U R296 1M +15V -15V C6 0.1U C94 0.1U C96 100U/63V C97 100U/63V R298 4R7 C7 0.1U R21 470R BIAS Q89A 2SK389 Q89B

34、 2SK389 +50V -50V U1 TL071 R284 1K1 C110 NC 1 2 JP3 C98 100U/63V C99 100U/63V Q71 2SA1943 Q79 2SC5200 R237 0.22R R238 0.22R R257 22R R258 22R R259 22R R260 22R Q72 2SA1943 Q80 2SC5200 R239 0.22R R240 0.22R R261 22R R262 22R R263 22R R26422R R285 1K R300 15K R218 100R R286 1K R219 100R R287 1K R301 2

35、2K R302 22K C112 330P C113 330P C114 330P 3 2 1 84 U9A OPA2134 5 6 7 U9B OPA2134 3 2 1 84 U10A OPA2134 5 6 7 U10B OPA2134 S4A SW SPDT S4B SW SPDT 45 S4C R288 1K R289 1K R290 1K R291 1K R303 47K R304 47K R265 22R R266 22R Q5 2SC2240 Q11 2SA970 Q14 BD677A Q18 2SC5171 Q67 2SA1930 1 W 2 R2 1K Q73 2SA194

36、3 Q81 2SC5200 R4 33K R8 10K R12 110R R22 470R D17 1N4148 D18 1N4148 C8 0.1U R37 5K6 R38 5K6 R39 5K6 R41 3K3 Q12 2SA970 R44 15K R45 12K C15 22P Q6 2SC2240 Q7 2SC2240 Q8 2SC2240 R47 133R R50 1K5 R23 470R R208 1K R211 22K C85 39P D19 1N4148 D20 1N4148 C9 0.1U R24 470R R215 220R R220 100R R25 470R R225

37、4K7 R226 4K7 R227 4K7 R230 470K A 1 K 2 C 4 E 3 Q86 OPTOISO1 1 2 3 Q88 BS107 R216 330R R232 680R R228 2K2 R51 1K1 Q64 2SC5171 R26 56R R27 56R C10 0.1U C87 220U/16V R28 220R R29 220R R241 0.22R R242 0.22R R267 22R R268 22R R269 22R R270 22R Q74 2SA1943 Q82 2SC5200 R243 0.22R R244 0.22R R271 22R R272

38、22R R273 22R R27422R C91 100N C92 100N R212 22K R292 1K C11 0.1U C93 1U R297 1M +15V -15V C12 0.1U C95 0.1U C100 100U/63V C101 100U/63V R299 4R7 C13 0.1U R30 470R BIAS Q90A 2SK389 Q90B 2SK389 +50V -50V 3 2 6 74 U8 TL071 R293 1K1 C111 NC C102 100U/63V C103 100U/63V Q75 2SA1943 Q83 2SC5200 R245 0.22R

39、R246 0.22R R275 22R R276 22R R277 22R R278 22R Q76 2SA1943 Q84 2SC5200 R247 0.22R R248 0.22R R279 22R R280 22R R281 22R R28222R C3 2200U/50V C17 2200U/50V C182200U/50VC192200U/50V C119100NC120100N R306 10R R307 10R C127 220U/35V C128 220U/35V +15V -15V Vin 1 GND 2 OUT 3 U11 7815 Vin 2 GND 1 OUT 3 U1

40、2 7915 Q65 2SC4793 Q68 2SA1837 R52 2K2 R206 2K2 C129 470U/35V C130 470U/35V D23 24V D24 24V C131 10U/50V C132 10U/50V +50V-POWER -50V-POWER +50V-POWER -50V-POWER +50V-POWER+50V -50V-50V-POWER C121 100N +15V +15V -15V -15V -15V +15V C122 100N C123 100N C124 100N C125 100N C126 100N C133 220U/50V C134

41、 220U/50V 1 2 JP4 C106 100U/63V C107 100U/63V C108 100U/63V C109 100U/63V 1 2 3 4 5 6 7 8 9 10 J6 CON10 BIAS SPK-RELAY FUSE-ERROR R5 20K R6 20K FUSE-ERROR DC-CHECK + DC-CHECK - DC-CHECK - DC-CHECK + Q91 BC846 D21 1N4007 R309 560R/3W 1 2 3 45 S8 RELAY-SPDT R310 100K R294 4K7 SPK-RELAYQ92 BC846 D22 1N

42、4148 R311 100K R295 4K7 XLR/RCA +15V R312 100R XLR/RCA R9 10K R10 10K C16 NC C83 NC +15V C20 2200U/50V C21 2200U/50V C22 2200U/50V C232200U/50V C242200U/50V C252200U/50V C26 1U/250V C27 1U/250V C28100NC29100N C30 100n C31 100n C32 100n C33 100n RV1 KTY81 OUT(+) OUT(-) C34 100N C35 100N C36 10N R33 1

43、0R R34 0R R36 0R R53 100R R54 100R R55 100R GND XLR+ XLR- RCA IN RCA-GND C37 100U/50V R56 1K R57 1K R58 1K R59 1K 1 2 JP1 1 2 JP2 R60 10R R61 10R R62 10R R63 10R 1234 A B C D 4321 D C B A Title NumberRevisionSize A4 Date:7-Dec-2005 Sheet of File:C:WORK.P2005-4B.SCHDrawn By: D1 BRIDGE1 C1 15000/63V C

44、2 15000/63V C3 15000/63V C4 15000/63V C5 15000/63V C6 15000/63V D2 BRIDGE1 D3 BRIDGE1 C7 15000/63V C8 15000/63V C9 15000/63V C10 15000/63V C11 15000/63V C12 15000/63V D4 BRIDGE1 P1 PLUG P2 PLUG P3 PLUG P4 PLUG P5 PLUG P6 PLUG P7 PLUG P8 PLUG P9 PLUG P10 PLUG P11 PLUG P12 PLUG P13 PLUG P14 PLUG R1 MR

45、S25 R2 MRS25 R3 22k R4 22k Performance Data 2000VA Torodial Transformer. A total of 180 000 uF electrolytes in the powersupply. Dual set of Speakerterminals for each channel. Balanced (RCA) and Unbalanced (XLR) inputs. Input impedance 15K, RCA and XLR Output Power (both channel driven): 2x250W 8Ohms load 20Hz-20Khz 2x400W 4Ohms load 20Hz-20Khz THD+N below 0.05% in both cases. Frequency response: 20Hz-100Khz 0.5dB Noise, below 100dBV THD+N: 1K 250W 8R load below 0.01%. Gain: 26dB unbalanced, 20dB balanced. Trigger input range: 4-15V.