HarrisMs15r电路图.pdf

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1、T.M. No. 888 1781 001 TECHNICAL MANUAL MS-15R STEREO GENERATOR 994 8140 001 HARRIS CORPORATION Broadcast Products Division Printed: Octoher 1977 RadioFans.CN 收音机爱 好者资料库 LIST OF EFFECTIVE PAGES TOTAL NUMBER OF PAGES IS AS FOLLOWS: 64 PAGE NO. ISSUE PAGE NO. Issue Title Page . , . Original List of Eff

2、ective Pages. Original iii through viii . , Original 1-1 through 1-5 . Original 1-6 . , ., , . , Blank 1-7 through 1-9 , . Original 1-10 . , . Blank 2-1 through 2-5 . Original 2-6 . Blank 2-7 . ,. . Original 2-8 . Blank 3-1 through 3-7 f , Original 3-8 . , . f f Blank 4-1 through 4-3 , f Original 4-

3、4 . , f f Blank 4.J5 through 4-7 f f Original 4-8 . Blank 4-9 through 4-12 , , , f Original 5-1 through 5-7 f , Original 5-8 If f f Blank 6-1 through 6-15 f Original 6-16 . Blank 7-1 , I , . Original 7-2 , . , . Blank APPENDIX A A-l through A-2 ., . Original ii WAR N I N G: Disconnect primary power

4、prior to servicing. RadioFans.CN 收音机爱 好者资料库 SAFETY NOTICE WARNING: THE CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE DANGEROUS AND UNDER CERTAIN CONDITIONS, COULD BE FATAL, This manual is intended as general guidance for trained and qualified in- stallation, operating, maintenance and service personne

5、l who are familiar with and aware of the dangers inherent to handling potentially hazardous electrical and/or electronic circuits. It is not intended to contain a complete statement of all safety precautions which should be observed by personnel in using this or other electronic equipment. THE INSTA

6、LLATIO, OPERATION, MAINTENANCE AND SERVICING OF THIS EQUIPMENT INVOLVES RISKS TO BOTH PERSONNEL AND EQUIPMENT, AND MUST BE PERFORMED ONLY BY PROPERLY TRAINED AND EXPERIENCED PERSONNEL EXERCISING DUE CARE. PER- SONNEL MUST FAMILIARIZP. THEMSELVF.S WITH SAFETY REQUIREMENTS, SAFE HANDLING AND OPERATING

7、 PRACTICE, AlJ RELATED FIRST-AID PROCEDURES (E. G., FOR ELEC- TRICAL BURNS AND ELECTRICAL SHOCK). HARRIS CORPORATION Broarleast Equipment Division shall not be responsible for injury or damage resulting from improper installation, operation, main- tenance or servicing, or from the use of improperly

8、trained or inexperienc- ed personnel in the prformance of such tasks, or from the failure of per- sons engaged in such tasks to exercise due care. As with all electronic equipment, care should be taken to avoid electrical shock in all circuits where substantial currents or voltages may be pre- sent,

9、 eitht:r through design or shore circuit. Caution should also be ob- served in lifting and hoisting equipment, especially regarding large struc- tures, during installation. LIABILITY LIMITATION The procedures outlind in this Manual are based on the information avail- able at the time nf publication

10、and should permit the specified use with minimum risk. However, the manufacturer cannot assume liability with re- spect to technical application of the contents and shall, under no circum- stances, be responsible :or damage or injury (whether to person or proper- ty) resulting from its use. The manu

11、facturer is specifically not liable for any damage or injury aris- ing out oE failure to follow the instructions in this Manual or failure to exercise due care and caution during installation, operation, mainte- nance and service of this equipment. CAUTIONARY OTICE Always disconnect power before ope

12、ning covers, doors, enclosures, gates, panels oc shields. Always use grounding sticks and short out high volt- age points before servicing. Never make internal adjustments, perform maintenance or service when alone or when tired. Never remove, short-circuit or tamper with interlock switches on acces

13、s covers, doors, enclosures, gates, panels or shields. Keep away from live circuits, know your equipment and dont take chances. Proper training of experienced personnel and observing the above guidelines will help as- sure safe and continued operation of this equipment. iii RadioFans.CN 收音机爱 好者资料库 p

14、aragraQh 1-l. 1-3. 1-5. 1-7. 1-10. 1-12. 1-13. 1-14. 1-16. 1-17. 1-19. 1-20. 1-23. 2-1. 2-3. 2-6. 2-8. 2-10. 2-12. 2-14. 2-18. 3-l, 3-3. 3-5. 3-7. 3-9. 3-11. 4-1. 4-3. 4-5. 4-8. 4-11. 4-12. 4-14. 4-16. 4-17. 4-18. 4-19. 4-21. iv OF CONTENTS SECTION I. GENERAL DESCRIPTION Physical Des tion . . Functi

15、onal Description . . Stereo Generator . . Di Synthesized Hodulation (Ste c Gene-rator . . 111 . a ., . l II . * If . . . I A RFI Filter . Power 1-1 1-1 1-1 1 3 1-3 1-3 1-3 1-3 1-4 Characteristics . 1-4 Electrical Characteristics . 1-4 Mechanical/Environmental Characteristics . 1-4 SECTION II. INSTAL

16、LATION In t roduct i on . Unp * . ,.55 . a. , f . . Ins tallation . Placement . Installation . Stereo Generator Wiring . . Checkout . . . . . . SECTION III. OPERATION Introduction Controls and Indicators . ty I . , . . II . f . I I . . . , . II . . II II . II . , . . . . fI. I . 5 Inadequate Output

17、. 5-9 Audio Distortion in Both SteTeo Channels . 5-10 Aud i 0 . ., . . I ., ., ., ., . , ., a ., ., a , ., f I II . ., II , . . . , . . 3-6 5-1. 6-3. 6-4. 6-7. 6-8. 6-10. 6-12. 6-14. viii M$-lSR Fault Isolation Index Rep laceab Ie Stereo Generator List Index , . . , . . II II . , . . ( .II . 4 , ,.,

18、. . . t.I t. Main Frame . Ribbon Cable, 20 Conductor . Coaxial Cable . Mother Board . RFI Filter Module (2AlA2) . Power Supply Module (2AlA3) . Extender Board (2A7) . Access Cab Extender Pack (2A6) . Stereo Analog Module (2A2) . Stereo Di al Hodule (2A3) . Stereo Overshoot Compensator Module (2M) .

19、Output Module (2A5) . WARNING-Disconnect power 10 5-7 6-2 6-3 6-4 6-5 6-6 6-7 6-8 6-9 6-10 6-11 6-12 6-13 6-14 6-15 SECTION I GENERAL DESCRIPTION 1-1. 1-2. This technical manual contains information necessary to install, operate, maintain, and service the R stereo generator. Sections in this technic

20、al manual provide the following information: a. SECTION I, GENERAL DESCRIPTION, ion equipment features, identifies or components, and par am- eters and specifications. b. SECTION II, INSTALLATION, provides unpack etion, and installation information, preoperational checks, and power on checks to ensu

21、re correct operation. c. SECTION III, OPERATION, identifies controls and indicators and provides equipment setup and operation. d. SECTION IV, PRINCIPLRS OF OPERATION, provides a functional description and detailed block diagram with of 0PQration. e. SECTION V, MAINTENkCE, provides preventive and co

22、rrective maintenance information and troubleshooting with instructions for t servi f. SECTION VI, PARTS T,IST. provides information for ordering replacement components and assemblies. g. SECTION VII, DIAGRAMS, provides block, c, schematic djagrams, and other drawings red r equipment maintenance. 1-3

23、. 1-4. The Harris MS-1SR stereo generator (figure produces a composite ste from two audio inputs. STEREO, MONO L, and MONO R. Provisions allow onal modes are addition of an exter- nal monaural module signal such as an SeA r. 1-5. PHYSI 1-6. The MS-15R stereo generator is both electrical and mechanic

24、ally modular in concept. Each discrete function 1s lemented by individual p in modules. Each module is provided with an insertion/extraction lever to aid in module servicing. All modules are with nomenclature to prevent use in the incorrect slot. Each module into the mother board which pro- vides el

25、ectrical interconnections. The non-modular components (power supply and RFI filter) are mounted to the case in the rear of the unit. The stereo or mounts in 3.5 inches (8.89 em) of standard inch (48.26 rack space. 1-1 WARNING. Disconnect mary power prior to 1761-2 Figure 1-1. MS-1SR Stereo Generator

26、 1-2 WARNI NG: Disconnect primary power prior to servicing. 1-7. FUNCTIONAL DESCRIPTION. 1-8. The Harris MS-15R stereo generator accepts two audio inputs at a +10 dBm level and generates a stereophonic, monaural left plus right, monaural left, or monaural right output signal at a low impedance level

27、 of 2.5V P-P to l2.0V P-P. An input provision allows summation of an external composite mod- ulation signal such as an SCA signal (see figure 1-2). 1-9. Many design features provide operational characteristics superior to conventional FM equipment. A defeatable phase and amplitude equalizer corrects

28、 for deficiencies in the equipment following the MS-lSR vhich might otherwise degrade the performance of the system. True peak-reading metering of the LEFT, RIGHT, L + R, L -R, or 8-BAND (total modulation) is implemented by a light emitting diode isplay. The metering sensitivity can be increased tim

29、es 10 to allow accurate pilot injection adjustment. Light emitting diodes monitor critical functions on each plug-in module. 1- 10. STEREO GENERATOR. 1-1.1. The stereo generator consists of the STEREO DIGITAL module, the STEREO ALOG module, and the STEREO OVSC module. Features of these modules are d

30、iscussed by the following text. 1-12. DIGITALLY SYNTHESIZED MODULATION COSH) STEREOPHONIC GENERATOR. The STEREO ANALOG and STEREO DIGITAL modules comprising the OSM stereophonic generator eliminate the compromise existing between other popular types of stereophonic generatorS. The switching type of

31、modulator produces poor sepa- ration at high frequencies. Poor harmonic rejection and SeA crosstalk are problems experienced with the balanced modulator type of stereophonic gener- ator. The DSM stereo generator produces typically 50 dB of stereophonic chan- nel separation from 30 Hz to 15 kHz with

32、an exceptionally clean baseband signal which promotes minimal interaction between stereo and SeA service. An auto- matic phase control circuit adjusts the stereophonic pilot phase to maintain separation. Selectable FLAT, 25, 50, or 75 microsecond pre-emphasis is provided. 1-13. DYNAMIC TRANSIENT RES

33、PONSE (DTR) FILTER. A Harris developed low- pass filter comprising the STEREO OVSC module operates independently of limiters or stereophonic generators to limit the overshoot on FM stereophonic transmission to two percent maximum on any input program material processed by any FM limiter. The filter

34、is transparent to audio within its O.5 dB pass- band of 30 Hz to 15 kHz and provides over 60 dB of attenuation at 19 kHz and above. The filter inaudibly reduces modulation overshoots to less than two percent. Typically, elimination of overshoot allows a two to six dB incre8s in loudness with no othe

35、r audible effect. 1-14. OUTPUT. 1-15. The OUTPUT module accepts the stereophonic composite signal from the STEREO ANALOG module and an external modulating signal (if used) from the EXT INPUT provision (J2) on the rear of the unit. The module provides peak- reading metering functions by means of a so

36、lid state LED meter, defeatable 1-3 WARNING; Disconnect primary power prior to servicing. phase and amplitude equalization to correct for deficiencies in equipment fol- lowing the MS-15R, and a low output drive. 1-16. MAl N FRlE. 1-17. RFI FILTER. All stere c generator inputs and outputs are filtere

37、d the RFI filter with the of the EXT INPUT (J2) and the OUTPUT (Jl) lines which via coaxial cables. 1-18. POWER SUPPLY. The power supply will operate from either 100 to 130 Vac or 200 to 260 Vac, 50 to 60 Hz. Selection of the 115 or 230 Vae nominal Be source voltage is accomp inte with wire jumpers.

38、 The power is bused by FI at 1 ampere for 115 Vae or 0.5 amperes for 230 Vae. The power supply p Vdc potentials with foldbac.k current The de is distributed by the mother board to each individual module where the supply is individual monolithic voltage regu- 1-19. 1-20. ELECTRICAL CHARACTERISTICS. 1

39、-22. Table 1-1 lists electrical operating characteristics and para- meters of the MS-15R stereophonic generator. 1-24. M$-15R s 1-4 MECHANICAL/ENVIRONMENTAL CHARACTERISTICS. Table 1-2 lists physical and environmental characteristics of the WARNING: Disconnect primary power prior 10 servicing. .-;1 i

40、 r -;E;-D;A;:-;D;-, I I I REMOTE M)DE SWITCHING PROVISION STEREO AUDIO INPtrrS r pO L, I MONO R IIlNO L+R STEREO . r LEFT RIGHT RFI/EM! FILTER I.J-MONO L MONO L I MONOR MONOR MONOR 1- -l MODE SWITCHING MODE I MONO L+R MONO CIRCUIT I STEREO STEREO STEREO I IIPDE SELECTION 114 KHZ SAMPLING I I LOGIC O

41、SCILLATOR/ 38 KIIZ OFF , I :f ; , I 00 ,= I j-+20V-l- Z0V -, I FILTER FILTER I I I I I I I I REGULATOR REGULATOR I I I OVSC MODULE BYPASS PROVISION 3!;.T 17.5 KHZ 0o-UT OVSC MODULE BYPASS PROVISION I I L J I LEFI CIIANNEL :- L:S IN -1 I I + 6 VDC FROM -6 VDC FROM AMPLIFIER l.0UT lOUT - -PRE-EMPHASIS

42、 / r -t: -l I I I +l5V A SOURCE +15V SOURCE -15V SOURCE STEREO ANALOG STEREO ANALOG I I 0 I 0 COMPOSITE MODULE MODULE 15 KHZ THRESHOLD I I OUTPUT LS CLIPPER I I PRE-EMPHASIZED I METER ro I CIRCUIT +20V REGULATOR +15V I J1 SOURCE ANALOG I r-_ -i-15V STEREO OVSC MODULE SWITCHES I I RIGHT CIIANNEL I -;

43、 REGULATOR SOURCE I I OUTPUT MODULE PRE-EMPIIASIZED I I AUDIO TO METER I t:l PRE-SUM/DIFFERENCE METER CIRCUIT EMPIIA AMPLIFIER COMPENSATOR I 15 KHZ 0 SIZED -+-t LOW-PASS THRESHOLD !il AUDIO . -. I I FILTER CLIPPER I I 8 s:o 1-.,.,., . .-1 I EXT RIGHT CIIANNEL L ?OUT J ANALOG I INPUT J2 I PS/ -F - - - - - - - - - -IN -I I MODULE I L_.VLM.D.L.1LP!.O:.II2.N _ :P 0-_2.v21!:S.!S.!P!.J I I 100 TO 130 VAC +20 VDC PRE-REGULATED I +6V OUT FILTER OUT -6V -6V -15V -15V I I OR 200 TO ,200 SOURCE TO ALL MODULES +l5V +6 V SOURCE SOURCE I VAC, 50/60 HZ I SOURCE I