AKG AKG0_service电路图.pdf

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1、Page 1 of 24 WMS 40 Service Manual * 11/07 Last modifications: Parts canceled, no longer available New part number pos. 15 page 6 Correction of part numbers page 6 New part number pos.17 page 12 Part number for XL1, page 20 Designation of KR3 crystal corrected from 19115330 to 19115530 Page 22 conne

2、ctor: remark added HT40: parts added Page 20: CF1,3 part number corrected from 17001073 to 17201073 _ AKG Acoustics GmbH, A Harman International Company, Lembckgasse 21 - 25, A-1230 Wien Austria Tel.: +(43 1) 86654 - 0; Fax.: +(43 1) 86654 - 1514; RadioFans.CN 收音机爱 好者资料库 WMS 40 a Harman internationa

3、l company Page 2 of 26 The complete WMS 40 system: The actual frequency is not differentiated by item number! WMS 40 HT/US Set with US power supply: 7611X0001 WMS 40 HT/EU Set with EU power supply: 7612X0001 WMS 40 HT/UK Set with UK power supply: 7613X0001 WMS 40 PT/US Set with US power supply: 7611

4、X0002 WMS 40 PT/EU Set with US power supply: 7612X0002 WMS 40 PT/UK Set with US power supply: 7613X0002 WMS 40 PT/US/Aerobic Set with C444 and US power supply: 7611X0003 WMS 40 PT/EU/Aerobic Set with C444 and EU power supply: 7612X0003 HT 40, handheld transmitter only: 7600X0001 PT 40, bodypack tran

5、smitter only: 7600X0002 SR40/US, receiver only with US power supply: 7601X0003 SR40/EU, receiver only with EU power supply: 7602X0003 SR40/UK, receiver only with UK power supply: 7603X0003 General remarks This manual contains technical information on the system functions and design. Exploded views a

6、nd lists of all available mechanic parts and electronic assemblies are added. Further a list of electronic components for one specific frequency for both handheld and bodypack transmitters and receiver is added for better technical understanding and trouble shooting. However we do not stock or sell

7、electronic components contained in those electronic components lists. When ordering frequency depending boards please state part number plus required frequency. All measurement values are nominal if not otherwise specified. All data subject to change without prior notice . All rights reserved. The c

8、ontents of this manual shall be used for service purposes only. Any use of the information given herewith by third parties without permission of the copyright owner is strictly forbidden! 2000 by AKG Acoustics GmbH, A Harman International Company, A-1230 Wien, Austria. Contacts: e-mail: RadioFans.CN

9、 收音机爱 好者资料库 a Harman international company a Harman international company WMS 40 Page 3 of 24 Short description Transmitter HT40: Audio part: The dynamic unit (D880) is connected via L1-L2-C6-C7 (RF-filter), to the MICAMP stage. The MICAMP is built as an amplifier, which is a part of the NE575- inte

10、grated circuit and has a gain of 8.8dB. It also forms the LOCUT filter at 30 Hz. Then the signal is fed to the COMPressor. Here the dynamic of the amplitude is reduced to its half value, expressed in dB. This compressor is built with the integrated circuit NE575 from Signetics. In the feedback loop

11、of the amplifier (Pin 12 and 14) there is the variable gain cell inserted. The variable gain cell is controlled by the rectified output voltage of the amplifier. C60 smoothes the rectified signal an controls the variable gain cell. C60 defines the so called time constant of the compressor. This feed

12、back loop leads in an compression of the input signal. R7-R8-C10 build the DC path in the feedback loop. The second amplifier is used to build the PREEMphasis circuit, which boosts the higher frequencies with an time constant of 50usec and a fixed gain of 7.9dB at the lower frequencies. The DEViatio

13、n ADjustment is realized with the potentiometer R16. Here at an input level of 100mV/1kHz the deviation is adjusted to 15kHz, which is the nominal modulation. Also at MUTE-position of the main switch, the signal is here shorted. Q2 with the additional parts form the HICUT filter at app. 25 kHz/3rd o

14、rder. Via C29-R28-C30-R30 the signal modulates the CCO. RF part: The UHF Signal is generated by a crystal controlled oscillator CCO and multiplier amplifier stages (AMP1, AMP2, AMP3, AMP4). The third harmonic of the CCO is filtered by BPF1, after 3 doubler stages Ftransmit/2 is filtered by BPF2. Aft

15、er the output amplifier AMP5 the signal is filtered by LPF and a ceramic filter BPF3. SETCodeTransmitter FrequencyCrystall FrequencyColor US54710,400MHz14,800MHzreddish brown US58734,600MHz15,304MHzpurple EU62802,525MHz16,719MHzwarm red EU63812,800MHz16,933MHzyellow UK69A854,900MHz17,810MHzviolet UK

16、69B858,200MHz17,879MHzgreen ISM1863,100MHz17,981MHzmelon yellow ISM2864,375MHz18,008MHzcool gray SP1848,750 MHz17,6822 MHzskyblue SP2851,750 MHz17,7447 MHzyellow green KR3745,650 MHz15,5344 MHzmintgreen KR4750,900 MHz15,6438 MHzdark grey Power supply: The internal voltage of 3.9V is generated from 2

17、 AA size batteries with a DC/DC converter. RadioFans.CN 收音机爱 好者资料库 WMS 40 a Harman international company Page 4 of 26 LPF 1 2 Order1 3.1KHz 2 wires DC DC UBatt 3.9V HT40-block schematics Ftransmit/48 UHF-frequency rangeAF-frequency 40Hz . 20KHz Order3 23KHz Order2 40Hz ON OFF MUTE MUTE OFF doublerdo

18、ublerdoublerdoubler Ftransmit/16Ftransmit/2FtransmitFtransmit XT2 CCOAMP1AMP5LPF ANT MIC COMPPREEMWIRE DC/DC LOWBATT BATTERY HICUTLOCUT SWITCH AMP3AMP4AMP2MICAMPBPF1BPF2BPF3 WMS 40 a Harman international company Page 5 of 26 3 4 1 8 2 5 6 7 9 16 12 17 13 10 11 15 14 18 16 19 Part nbr. :31404010 Atte

19、ntion: Before reassembly twist stranded wires leading to capsule in counter- direction to the way of screwing in the threaded sleeve. Otherwise the wires will break. Achtung: Vor dem Zusammenbau die Litzen zur Kapsel im Gegensinn zur Schraubrichtung der Gewindehlse verdrillen, da sonst die Anschlsse

20、 abreissen! 20 WMS 40 a Harman international company Page 6 of 26 Short description Transmitter PT40: Audio part: The input signal is connected at Pin2 via L13L14C44C72 (RFfilter), to the MICAMP stage (with Pin1 = ground). The supply voltage of 3.9V for the microphones is connected via R68 at pin 3

21、of the connector . For microphone application Pin2 and Pin3 has to be shorten in the connector of the microphone. The MICAMP is built as an amplifier, which is a part of the NE575 integrated circuit and has a variable gain of 0dB to 21dB. It also forms the LOCUT filter at 30 Hz and the MIC/LINE swit

22、ch is situated here, which reduces the input signal by app. 14dB at line position. Then the signal is fed to the COMPressor. Here the dynamic of the amplitude is reduced to its half value, expressed in dB. This compressor is built with the integrated circuit NE575 from Signetics. In the feedback loo

23、p of the amplifier (Pin 12 and 14) is the variable gain cell inserted. The variable gain cell is controlled by the rectified output voltage of the Description Part number Item Printed circuit main board, complete, tested 80004012 1 Printed circuit dc/dc board, complete, tested 80004013 2 ON/MUTE/OFF

24、 switch 92100400 3 Crystal 14.8003MHz (For US54, 710.400MHz) reddish brown 19114801 4 Crystal 14.8128MHz (For US54B, 711,000MHz) skyblue 19114811 4 Crystal 15.3045MHz (For US58, 734.600MHz) purple 19115301 4 Crystal 15.354MHz (For US58B, 736.975MHz) yellowgreen 19115350 4 Crystal 15.602 MHz (For US6

25、0A, 748.875MHz) green 19115600 4 Crystal 15.6576MHz (For US60B, 751.550MHz) dark purple 19115650 4 Crystal 16.7196MHz (For EU62, 802.525MHz) warm red 19116710 4 Crystal 16.7732MHz (For EU62B, 805.100MHz) pink 19116772 4 Crystal 16.9336MHz (For EU63, 812.800MHz) yellow 19116930 4 Crystal 16.9399MHz (

26、For EU63B, 813.100MHz) light red 19116931 4 Crystal 17.8107MHz (For UK69A, 854.900MHz) violetblue 19117810 4 Crystal 17.8795MHz (For UK69B, 858.200MHz) green 19117871 4 Crystal 17.9815MHz (For ISM1, 863.100MHz) melon yellow 19117980 4 Crystal 18.0081MHz (For ISM2, 864.375MHz) cool gray 19118000 4 Cr

27、ystal 18.0180MHz (For ISM3, 864.850MHz) violet 19118011 4 Crystal 15.5344MHz (For KR3, 745.650MHz) mint green 19115530 4 Crystal 15.6438MHz (For KR4, 750.900MHz) dark gray 19115640 4 Crystal 17.6822MHz (For SP1, 848.750MHz) 19117680 4 Crystal 17.7447MHz (For SP2, 851.750MHz) 19117740 4 Crystal 16.84

28、6MHz (For JP1, 808.625MHz) greenbrown 19116840 4 Crystal 16.857MHz (For JP2, 809.125MHz) light blue 19116850 4 Ceramic Filter 710.151MHz (For US54) 19307100 20 Ceramic Filter 734.151MHz (For US58) 19307340 20 Ceramic Filter 747.141MHz (For KR3) 19374710 20 Ceramic Filter 750.141MHz (For KR4) 1930750

29、0 20 Ceramic Filter 802.151MHz (For EU62) 19308020 20 Ceramic Filter 812.151MHz (For EU63) 19308120 20 Ceramic Filter 854.151MHz (For UK69A) 19308540 20 Ceramic Filter 858.151MHz (For UK69B) 19308580 20 Ceramic Filter 864.152MHz (For ISM1) 19308640 20 Ceramic Filter 864.152MHz (For ISM2) 19308640 20

30、 Ceramic filters for further frequencies on request 20 Battery compartment 24200010 5 Battery contact (helical spring) 36304010 6 Battery contact (plate) 36205150 7 Housing tube, printed 27004010 8 Antenna cover, black 21504010 9 Antenna cover, orange 21504013 9 Antenna cover, yellow 21504014 9 Ante

31、nna cover, red 21504012 9 Antenna cover, brown 21504011 9 Antenna cover, pink 21504017 9 Antenna cover, green 21504015 9 Antenna cover, violet 21504016 9 Antenna cover, grey 21504018 9 ON/MUTE/OFF label with LED lens 22004010 10 ON/MUTE/OFF slider 25204010 11 Frame for ON/MUTE/OFF slider 22204010 12

32、 Battery door 20104040 13 Capsule 2610Z0034 14 Top grill 9999N07180 15 Housing screw 33002060 16 Rubber plate 65045140 17 Ring 36104010 18 Cover 30818090 19 Stand adapter 23200010 - WMS 40 a Harman international company Page 7 of 26 amplifier. C18 smoothes the rectified signal an controls the variab

33、le gain cell and is the so called timeconstant of the compressor. This feedback loop leads in an compression of the input signal. R45R46C24 build the dcpath in the feedback loop. The second amplifier is used to build the preemphasis circuit, which boosts the higher frequencies with an time constant

34、of 50usec and a fixed gain of 7.9dB for the lower frequencies. The deviationadjustment is realized with the potentiometer VR3. Here at an inputlevel of 300mV at 1kHz (and the inputgain set to 0dB=minimumgain) the deviation is adjusted to 15kHz, which is the nominal modulation. Also at MUTEposition o

35、f the main switch, the signal is here shorted. Q7with the additional parts form the HICUTfilter at app. 25 kHz / 3. order. Via C25R69C26R17 the signal modulates the CCO. RF part: The UHF Signal is generated by a crystal controlled oscillator CCO and multiplier amplifier stages (AMP1, AMP2, AMP3, AMP

36、4). The third harmonic of the CCO is filtered by BPF1, after 3 doubler stages Ftransmit/2 is filtered by BPF2. After the output amplifier AMP5 the signal is filtered by LPF and a ceramic filter BPF3. Power supply: The internal voltage of 3.9V is generated from 2 AA size batteries with a DC/DC conver

37、ter. WMS 40 a Harman international company Page 8 of 26 LPF GC1 2 Order1 3.1KHz 3 Pins DC DC UBatt 3.9V -22.0dB PT40-block schematics Ftransmit/48 UHF-frequency rangeAF-frequency 40Hz . 20KHz Order3 23KHz Order2 40Hz ON OFF MUTE MUTE OFF doublerdoublerdoublerdoubler Ftransmit/16Ftransmit/2FtransmitF

38、transmit 0dB-14dB XT2 CCOAMP1AMP5LPF ANT MIC MICAMP COMPPREEM CON DC/DC LOWBATT BATTERY GAINPOT HICUT LOCUT SWITCH AMP3AMP4AMP2 ATT MIC/LINE BPF1BPF2BPF3 WMS 40 a Harman international company Page 9 of 26 Description Part number Item Printed circuit board, complete, tested 80000402 1 Antenna 8320082

39、0 2 ON/MUTE/OFF switch 92100700 3 MIC/LINE switch 92100190 4 Sensitivity trimmer potentiometer 11001043 5 Crystal: see parts list for HT40, Pos 4 6 Housing, bottom shell 21600400 7 Housing, top shell, printed 20300400 8 Battery door 20100400 9 Battery contact (single helical spring) 36300400 10 Batt

40、ery contact (plate) 36200400 11 Battery contact (plate with helical spring) 36003340 12 Belt clip 36400151 13 Housing screw 33026120 14 Mic socket 90605030 15 Ceramic Filter: see parts list for HT40, Pos 20 16 1 2 3 4 6 5 9 8 7 10 13 11 12 14 15 16 WMS 40 a Harman international company Page 10 of 26

41、 Short description Receiver SR40: The SR40 is a stationary non diversity receiver applying a double conversion conception. The receiver is non switchable, his reception frequency in the UHF range is: SET CODE FRx: FLO1: XT1: FIF1: FLO2=XT2: FIF2: US54 710,400MHz 654,400MHz 36,356MHz 56,0MHz 45,3MHz

42、10,7MHz US58 734,600MHz 678,600MHz 37,700MHz 56,0MHz 45,3MHz 10,7MHz EU62 802,525MHz 746,525MHz 41,474MHz 56,0MHz 45,3MHz 10,7MHz EU63 812,800MHz 756,800MHz 42,044MHz 56,0MHz 45,3MHz 10,7MHz UK69A 854,900MHz 798,900MHz 44,383MHz 56,0MHz 45,3MHz 10,7MHz UK69B 858,200MHz 802,200MHz 44,567MHz 56,0MHz 4

43、5,3MHz 10,7MHz ISM1 863,100MHz 807,100MHz 44,839MHz 56,0MHz 45,3MHz 10,7MHz ISM2 864,375MHz 808,375MHz 44,910MHz 56,0MHz 45,3MHz 10,7MHz The elements determining the reception frequency are the band pass filter BPF1 and the crystal of local mixer oscillator XT1 RFPart: The front end consists of a ce

44、ramic pass band filter BPF1, a bipolar transistor amplifier AMP1 and a low pass filter LPF. The 1st MIXER1 converts the RF signal to the 1st intermediate frequency of 56MHz, the 2nd MIXER2 converts the signal to the 2nd intermediate (demodulation) frequency 10.7MHz. The 2nd intermediate frequency is

45、 band pass filtered (BPF2,3), amplified (AMP2) and gets to the input of the demodulator IC (LIMAMP and DEMOD). The 1st mixer oscillator (CCO1) is designed as a crystal controlled oscillator (the 3rd harmonic is filtered out by BPF4) and multiplier amplifiers AMP3 and AMP4. The LO signal is filtered

46、by BPF5, BPF6 and is 56MHz below the reception frequency. The 2nd mixer oscillator (CCO2) is crystal controlled too, his frequency is 45,3MHz. AudioPart: The audio signal from DEMODulator (BA4110IFdemodulator) is amplified by AFAMP with U11Pin123. Here the output signal is adjusted to 500mV/1kHz at

47、15kHz deviation. Then the signal runs to the MUTEstage, which is the second half of U11. Muting is realized with Q29, which shortens the feedback path. Q29 is controlled by the RSSI signal. The RSSIsignal comes from the IFcircuit BA4110. U7 forms an COMPARATOR, which switches the MUTEtransistor Q29

48、at RSSIlevel lower than 98dBm. This value can be adjusted via SQUELCHpotentiometer VR1. Q25 builds an HICUTfilter at 20 kHz/2nd order. Amplifier Pin17/18/19 of NE575 forms the DEEMphasis circuit. The frequencies above 3 kHz are decreased with first order (timeconstant 50 sec). Then the signal is expanded with the EXPander circuit NE575. Here the original level behavior of the input signal at the transmitter input is restored. The expander time constant is defined by C48. The second free amplifier of NE575 is used as buffer before the vol