Primare-A32-pwr-sm 维修电路原理图.pdf

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 document 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 design. 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 flat, 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 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 shutting 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 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 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 shutting 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 speaker 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. General 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 checked 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 amplifier 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 mode 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 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 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 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 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. 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 might 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. Wait 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. 12345678ABCD87654321DCBATitleNumberRevisionSizeA3Date:14-Nov-2005Sheet of File:C:WORK.P2005-3D.SCHDrawn By:C42200U/25VS1T500mAD12BRIDGE112345678910J1CON10Bias LSPK Relay LXLR/RCA L+15V LTemp1 LTemp2 LGND LFuse LDC-Check+ LDC-Check- L12345678910J2CON10Bias RSPK Relay RXLR/RCA R+15V RTemp1 RTemp2 RGND RFuse RDC-Check+ RDC-Check- RR50RR60RR7536RR8560RR92K2R21510RR2410RR264K7R332R2R342R2SW BAL/UNBALQ1BCV46R102K2R252K2C1+1V+2C1-3C2+4C2-5V-6T2OUT7R2IN8R1IN13R1OUT12R2OUT9VCC16GND15T1OUT14T2IN10T1IN11U2MAX3232ECAE1234P2HEADER 4123F1NMF40123F2NMF40C8100NC9100NC10100NC11100NC12100N+3.3VRS232NO11N028C12C27NC13NC26COIL4COIL5K1RELAY DPDT378632541D1KB2855R37NTC 7RR38NTC 7RR39NTC 7RNO11N028C12C27NC13NC26COIL4COIL5K2RELAY DPDT3240V120VQ2BCV46R11470RQ4BCV46R12470RD2BDY17DD3BDY17DP2.0/ICB/DAC0/ADC031P2.1/OCD/AD022P0.0/CMP2/KBI0/AD013P1.7/OCC/AD004P1.6/OCB5P1.5/RST6VSS7P3.1/XTAL18P1.0/TXD18P0.5/CMPREF/KBI522VDD21P0.1/CIN2B/KBI1/AD1026P0.3/CIN1B/KBI3/AD1224P0.6/CMP1/KBI620P0.2/CIN2A/KBI2/AD1125P1.1/RXD17P3.0/XTAL2/CLKOUT9P1.4/INT110P1.3/INT0/SDA11P1.2/T0/SCL12P2.5/SPICLK16P0.4/CIN1A/KBI4/AD1323P2.2/MOSI13P2.3/MISO14P2.7/ICA28P0.7/T1/KBI719P2.4/SS15P2.6/OCA27U3P89LPC935R13 10KR14 10KR1510KR1610KR2710KR2810KC13100U/6.3VC14100U/6.3VC15100U/6.3VC16100U/6.3V+3.3VDX24MHZC1710pC1822pSER14SRCLK11SRCLR10RCLK12E13O015O11O22O33O44O55O66O77Q79VCC16GND8U574LVC595+3.3VDR293K3R303K3R313K3D9LEDD10LEDD11LEDR40 412RR41 110R+3.3VDC22100ND4LL4148D5LL4148R324K7Q5BC8464231SW1SW-B3R1810K+3.3VDCheck error+3.3VD6LL4148D7LL4148C23100N12345678910J3CON1012345678910J4CON10S2NC123S3SW-SPDT+3.3VStandby modeR194K7+3.3V+3.3VD+3.3VDR42470KC24330ND8LL4148+3.3VD1234P5HEADER 4SW2R201KPIN4 ON P5PIN3 ON P5PIN2 ON P5PIN1 ON P5PCB 2PCB3PCB4P6PLUGP7PLUGC147nF/275V X2C247nF/275V X2P1PLUGP3PLUGP4PLUGP8PLUGP9PLUGP10PLUG18151391145T1TRANSF53X44162354SW3SW120-240240VTo mains TransformerC19100NC20100NC2510NR4310RC26100U/25VJ5PHONEJACK STEREO SWJ6PHONEJACK STEREO SWC27100NR4410RC2847u/16VR12K2R2NCR3NCQ6BC846Q7BC846R44K7R224K7+3.3VDR2310KR4510KR4610KQ3BCV46R4710KC29100U/6.3VC30100U/6.3VVin3ADJ1Vout2U4LD1085V33C31100nC32100nC33100U/6.3V+3.3VD+3.3VDD13LL4148D14LL4148D15LL4148D16LL4148D17LL4148D18LL4148D19LL4148D20LL4148D21LL4148D22LL4148D23LL4148D24LL414812345678ABCD87654321DCBATitleNumberRevisionSizeA2Date:7-Dec-2005 Sheet of File:C:WORK.P2005-8C.SCHDrawn By:Q12SC2240Q92SA970Q13BD677AQ152SC5171Q662SA1930R11KQ692SA1943Q772SC5200R333KR710KR11110RR13470RD11N4148D21N4148C10.1UR315K6R325K6R355K6R403K3Q102SA970R4215KR4312KC1422PFQ22SC2240Q32SC2240Q42SC2240R46133RR481K5R14470RR2071KR20922KC8439PD31N4148D41N4148C20.1UR15470RR213220RR217100RR16470RR2214K7R2224K7R2234K7R229470KA1K2C4E3Q85OPTOISO1123Q87BS107R214330RR231680RR2242K2R491K1Q172SC5171R1756RR1856RC40.1UC86220U/16VR19220RR20220RR2330.22RR2340.22RR24922RR25022RR25122RR25222RQ702SA1943Q782SC5200R2350.22RR2360.22RR25322RR25422RR25522RR25622RS16.3AS26.3AC88100NC89100NR21022KR2831KC50.1UC901UR2961M+15V-15VC60.1UC940.1UC96100U/63VC97100U/63VR2984R7C70.1UR21470RBIASQ89A2SK389Q89B2SK389+50V-50VU1TL071R2841K1C110NC12JP3C98100U/63VC99100U/63VQ712SA1943Q792SC5200R2370.22RR2380.22RR25722RR25822RR25922RR26022RQ722SA1943Q802SC5200R2390.22RR2400.22RR26122RR26222RR26322RR26422RR2851KR30015KR218100RR2861KR219100RR2871KR30122KR30222KC112330PC113330PC114330P32184U9AOPA2134567U9BOPA213432184U10AOPA2134567U10BOPA2134S4ASW SPDTS4BSW SPDT45S4CR2881KR2891KR2901KR2911KR30347KR30447KR26522RR26622RQ52SC2240Q112SA970Q14BD677AQ182SC5171Q672SA19301W2R21KQ732SA1943Q812SC5200R433KR810KR12110RR22470RD171N4148D181N4148C80.1UR375K6R385K6R395K6R413K3Q122SA970R4415KR4512KC15 22PQ62SC2240Q72SC2240Q82SC2240R47133RR501K5R23470RR2081KR21122KC8539PD191N4148D201N4148C90.1UR24470RR215220RR220100RR25470RR2254K7R2264K7R2274K7R230470KA1K2C4E3Q86OPTOISO1123Q88BS107R216330RR232680RR2282K2R511K1Q642SC5171R2656RR2756RC100.1UC87220U/16VR28220RR29220RR2410.22RR2420.22RR26722RR26822RR26922RR27022RQ742SA1943Q822SC5200R2430.22RR2440.22RR27122RR27222RR27322RR27422RC91100NC92100NR21222KR2921KC110.1UC931UR2971M+15V-15VC120.1UC950.1UC100100U/63VC101100U/63VR2994R7C130.1UR30470RBIASQ90A2SK389Q90B2SK389+50V-50V32674U8TL071R2931K1C111NCC102100U/63VC103100U/63VQ752SA1943Q832SC5200R2450.22RR2460.22RR27522RR27622RR27722RR27822RQ762SA1943Q842SC5200R2470.22RR2480.22RR27922RR28022RR28122RR28222RC32200U/50VC172200U/50VC182200U/50VC192200U/50VC119100NC120100NR30610RR30710RC127220U/35VC128220U/35V+15V-15VVin1GND2OUT3U117815Vin2GND1OUT3U127915Q65 2SC4793Q682SA1837R522K2R2062K2C129470U/35VC130470U/35VD2324VD2424VC13110U/50VC13210U/50V+50V-POWER -50V-POWER+50V-POWER-50V-POWER+50V-POWER+50V-50V-50V-POWERC121100N+15V+15V-15V-15V-15V+15VC122100NC123100NC124100NC125100NC126100NC133220U/50VC134220U/50V12JP4C106100U/63VC107100U/63VC108100U/63VC109100U/63V12345678910J6CON10BIASSPK-RELAYFUSE-ERRORR520KR620KFUSE-ERRORDC-CHECK +DC-CHECK -DC-CHECK -DC-CHECK +Q91BC846D211N4007R309560R/3W12345S8RELAY-SPDTR310100KR2944K7SPK-RELAYQ92BC846D221N4148R311100KR2954K7XLR/RCA+15VR312100RXLR/RCAR910KR1010KC16NCC83NC+15VC202200U/50VC212200U/50VC222200U/50VC232200U/50VC242200U/50VC252200U/50VC261U/250VC271U/250VC28100NC29100NC30100nC31100nC32100nC33100nRV1KTY81OUT(+)OUT(-)C34100NC35100NC3610NR3310RR340RR360RR53100RR54100RR55100RGNDXLR+XLR-RCA INRCA-GNDC37100U/50VR561KR571KR581KR591K12JP112JP2R6010RR6110RR6210RR6310R1234ABCD4321DCBATitleNumberRevisionSizeA4Date:7-Dec-2005 Sheet of File:C:WORK.P2005-4B.SCHDrawn By:D1BRIDGE1C115000/63VC215000/63VC315000/63VC415000/63VC515000/63VC615000/63VD2BRIDGE1D3BRIDGE1C715000/63VC815000/63VC915000/63VC1015000/63VC1115000/63VC1215000/63VD4BRIDGE1P1PLUGP2PLUGP3PLUGP4PLUGP5PLUGP6PLUGP7PLUGP8PLUGP9PLUGP10PLUGP11PLUGP12PLUGP13PLUGP14PLUGR1MRS25R2MRS25R322kR422kPerformance 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.