AKG_WMS_40_Service_Manual电路图.pdf

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1、Page 1 of 24 WMS 40 Service Manual * April 2005 Last modifications: Part number for XL1, page 20 Designation of KR3 crystal corrected from 19115330 to 19115530 Page 22 connector: remark added HT40: parts added Page 20: CF1,3 part number corrected from 17001073 to 17201073 AKG Acoustics GmbH, A Harma

2、n 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 international company Page 2 of 25 The complete WMS 40 system: The actual frequency is not differentiated by item number! WMS 40 HT/US Set wi

3、th 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: 7611X0002 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

4、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 transmitter only: 7600X0002 SR40/US, receiver only with US power supply: 7601X0003 SR40/EU, receiver only with EU power supply: 7602X

5、0003 SR40/UK, receiver only with UK power supply: 7603X0003 General remarks This manual contains technical information on the system functions and design. Exploded views and lists of all available mechanic parts and electronic assemblies are added. Further a list of electronic components for one spe

6、cific 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 electronic components contained in those electronic components lists. When ordering frequency depending boards please state part

7、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 contents of this manual shall be used for service purposes only. Any use of the information given herewith by third parties withou

8、t permission of the copyright owner is strictly forbidden! 2000 by AKG Acoustics GmbH, A Harman International Company, A-1230 Wien, Austria. Contacts: Phone: +431 86654-1519 Fax: +431 86654-1514 e-mail: RadioFans.CN 收音机爱 好者资料库 a Harman international company a Harman international company WMS 40 Page

9、 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- integrated circuit and has a gain of 8.8dB. It also forms the LOCUT filter at 30 Hz. Then

10、 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 of the amplifier (Pin 12 and 14) there is the variable gain cell inserted. The variab

11、le 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 feedback loop leads in an compression of the input signal. R7-R8-C10 build the DC path in

12、 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 DEViation ADjustment is realized with the potentiometer R16. Here at an input level of 100mV/

13、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 order. Via C29-R28-C30-R30 the signal modulates the CCO. RF part: The UHF Signal is ge

14、nerated 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. After the output amplifier AMP5 the signal is filtered by LPF and a ceramic filter BPF3.

15、 SETCodeTransmitter FrequencyCrystall FrequencyColor US54710,400MHz14,800MHzreddish brown US58734,600MHz15,304MHzpurple EU62802,525MHz16,719MHzwarm red EU63812,800MHz16,933MHzyellow UK69A854,900MHz17,810MHzviolet UK69B858,200MHz17,879MHzgreen ISM1863,100MHz17,981MHzmelon yellow ISM2864,375MHz18,008M

16、Hzcool 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 AA size batteries with a DC/DC converter. RadioFans.CN 收音机爱 好者资料库 WMS 40 a Harman in

17、ternational company Page 4 of 25 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 doublerdoublerdoublerdoubler Ftransmit/16Ftransmit/2FtransmitFtransmit XT2 CCOAMP1AMP5LPF ANT

18、MIC COMPPREEMWIRE DC/DC LOWBATT BATTERY HICUTLOCUT SWITCH AMP3AMP4AMP2MICAMPBPF1BPF2BPF3 WMS 40 a Harman international company Page 5 of 25 Description Part number Item Printed circuit main board, complete, tested 80004012 1 Printed circuit dc/dc board, complete, tested 80004013 2 ON/MUTE/OFF switch

19、 92100400 3 Crystal 14.8003MHz (For US54, 710.400MHz) 19114801 4 Crystal 15.3045MHz (For US58, 734.600MHz) 19115301 4 Crystal 16.7196MHz (For EU62, 802.525MHz) 19116710 4 Crystal 16.9336MHz (For EU63, 812.800MHz) 19116930 4 Crystal 17.8107MHz (For UK69A, 854.900MHz) 19117810 4 Crystal 17.8795MHz (Fo

20、r UK69B, 858.200MHz) 19117871 4 Crystal 17.9815MHz (For ISM1, 863.100MHz) 19117980 4 Crystal 18.0081MHz (For ISM2, 864.375MHz) 19118000 4 Crystal 15.5344MHz (For KR3, 745.650MHz) 19115530 4 Crystal 15.6438MHz (For KR4, 750.900MHz) 19115640 4 Crystal 17.6822MHz (For SP1, 848.750MHz) 19117680 4 Crysta

21、l 17.7447MHz (For SP2, 851.750MHz) 19117740 4 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 Antenna cover

22、, 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 Battery

23、door 20104040 13 Capsule 2610Z0034 14 Top grill 39004010 15 Housing screw 33002060 16 Rubber plate 65045140 17 Ring 36104010 18 Cover 30818090 19 Stand adapter 23200010 - 3 4 1 8 2 5 6 7 9 16 12 17 13 10 11 15 14 18 16 19 Part nbr. :31404010 Attention: Before reassembly twist stranded wires leading

24、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 abreissen! WMS 40 a Harman international company Page

25、 6 of 25 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 of the connector . For microphone application Pin2 and Pi

26、n3 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 switch is situated here, which reduces the input signal by ap

27、p. 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 loop of the amplifier (Pin 12 and 14) is the variable gain c

28、ell inserted. The variable gain cell is controlled by the rectified output voltage of the amplifier. C18 smoothes the rectified signal an controls the variable gain cell and is the so called timeconstant of the compressor. This feedback loop leads in an compression of the input signal. R45R46C24 bui

29、ld 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 of 50usec and a fixed gain of 7.9dB for the lower frequencies. The deviationadjustment is realized with the potentiometer VR3. Here at an input

30、level 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 of the main switch, the signal is here shorted. Q7with the additional parts form the HICUTfilter at app. 25 kHz / 3. order. Via C25R69C26R17 the

31、 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. After the output amplifier AMP5

32、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 UK69B858,200MHz17,879MHzgreen I

33、SM1863,100MHz17,981MHzmelon yellow ISM2864,375MHz18,008MHzcool gray SP1848,750MHz17,6822MHzskyblue SP2851,750MHz17,7447MHzyellow green KR3745,650MHz15,5344MHzmintgreen KR4750,900MHz15,6438MHzdark grey Power supply: The internal voltage of 3.9V is generated from 2 AA size batteries with a DC/DC conve

34、rter. WMS 40 a Harman international company Page 7 of 25 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/2Ftransmit

35、Ftransmit 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 8 of 25 Description Part number Item Printed circuit board, complete, tested 80000402 1 Antenna 832008

36、20 2 ON/MUTE/OFF switch 92100700 3 MIC/LINE switch 92100190 4 Sensitivity trimmer potentiometer 11001043 5 Crystal 14.8003MHz (For US54, 710.400MHz) 19114801 6 Crystal 15.3045MHz (For US58, 734.600MHz) 19115301 Crystal 16.7196MHz (For EU62, 802.525MHz) 19116710 Crystal 16.9336MHz (For EU63, 812.800M

37、Hz) 19116930 Crystal 17.8107MHz (For UK69A, 854.900MHz) 19117810 Crystal 17.8795MHz (For UK69B, 858.200MHz) 19117871 Crystal 17.9815MHz (For ISM1, 863.100MHz) 19117980 Crystal 18.0081MHz (For ISM2, 864.375MHz) 19118000 Crystal 15.5344MHz (For KR3, 745.650MHz) 19115530 Crystal 15.6438MHz (For KR4, 75

38、0.900MHz) 19115640 Crystal 17.6822MHz (For SP1, 848.750MHz) 19117680 Crystal 17.7447MHz (For SP2, 851.750MHz) 19117740 Housing, bottom shell 21600400 7 Housing, top shell, printed 20300400 8 Battery door 20100400 9 Battery contact (single helical spring) 36300400 10 Battery contact (plate) 36200400

39、11 Battery contact (plate with helical spring) 36003340 12 Belt clip 36400151 13 Housing screw 33026120 14 Mic socket 90605030 15 1 2 3 4 6 5 9 8 7 10 13 11 12 14 15 WMS 40 a Harman international company Page 9 of 25 Short description Receiver SR40: The SR40 is a stationary non diversity receiver ap

40、plying 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 654,400MHz36,356MHz56,0MHz45,3MHz 10,7MHz US58 734,600MHz 678,600MHz37,700MHz56,0MHz45,3MHz 10,7MHz EU62 802,525MHz 746,5

41、25MHz41,474MHz56,0MHz45,3MHz 10,7MHz EU63 812,800MHz 756,800MHz42,044MHz56,0MHz45,3MHz 10,7MHz UK69A 854,900MHz 798,900MHz44,383MHz56,0MHz45,3MHz 10,7MHz UK69B 858,200MHz 802,200MHz44,567MHz56,0MHz45,3MHz 10,7MHz ISM1 863,100MHz 807,100MHz44,839MHz56,0MHz45,3MHz 10,7MHz ISM2 864,375MHz 808,375MHz44,

42、910MHz56,0MHz45,3MHz 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 ceramic pass band filter BPF1, a bipolar transistor amplifier AMP1 and a low pass filter LPF. The 1st MIXER1 c

43、onverts 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 band pass filtered (BPF2,3), amplified (AMP2) and gets to the input of the demodulator IC (LIMAMP and DEMOD

44、). 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 by BPF5, BPF6 and is 56MHz below the reception frequency. The 2nd mixer oscillator (CCO2) is crystal control

45、led 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 15kHz deviation. Then the signal runs to the MUTEstage, which is the second half of U11. Muting is realized

46、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 at RSSIlevel lower than 98dBm. This value can be adjusted via SQUELCHpotentiometer VR1. Q25 builds an HICUTf

47、ilter 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 transmitt

48、er input is restored. The expander time constant is defined by C48. The second free amplifier of NE575 is used as buffer before the volume control section. With VR2 (VOLUME) the output level can be adjusted from line level (500mV) to mic. level (35mV). The next stage is a amplifier with a gain of 3.

49、9dB OUTAMP. C39 separates the dcvoltage from the signal and then the signal is fed to the XLR and 6.3mm JACK. Q31 and Q32 build a CLICKSUPPRessioncircuit. In the OFFposition of the main switch this transistors are turned on. If the receiver is turned ON, the transistors remain ON for a short time (by C50), s