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STUDER A764 Alignment, description, partlist, schematics
Bedienungs- un serviceanleitung, Operation and Service Instructions
10.27.1311 (Ed. 0590) Published 5/89
Grayscale and colour scans (where aplicable), 207 pages, German and English
Alignment, description, partlist, schematics
Contents STUDER A764
1 SETUP PROCEDURE
1.1 POWER CONNECTION
1.2 CONNECTOR PANEL
1.3 PIN ASSIGNMENT
1.3.1 Line outputs
1.3.2 Output multiplex MPX/SCA [36]:Coax BNC
1.3.3 RS 232 interface [38]:9-pin D-connector
1.3.4 REMOTE [40]:6-pin DIN socket 1.3.5 RDS [41]:5-pin DIN socket
1.3.6 CONTROL [42]:15-pin D-socket
1.4 OPERATOR CONTROLS
1.4.1 Vacuum fluorescence display [11]
1.4.2 LC DISPLAY [20]
1.5 OPTIONS AND ACCESSORIES
1.5.1 Options 1.5.2 Accessories
1.6 Available versions
1.7 TECHNICAL DATA
1.7.1 Tuner
1.7.2 MPX/CA amplifier (option)
2. DISASSEMBLY INSTRUCTIONS
2.1 TIPS, TOOLS
2.2 REMOVING THE DUST COVER
2.3 FUSES
2.4 DISASSEMBLING THE CHASSIS
2.4.1 RDS/ARI unit (option)
2.4.2 Power transformer
2.4.3 Power supply section
2.4.4 Line amplifier
2.4.5 MPX/SCA amplifier
2.4.6 FM tuner module
2.5 DISASSEMBLING THE FRONT SECTION
2.5.1 Removal
2.5.2 Operating chassis
2.5.3 Glass panels
2.5.4 Glass lid
2.5.5 Microcomputer module
2.5.6 Keys
3. FUNCTIONAL DESCRIPTION
3.1 POWER SUPPLY
3.1.1 Power transformer A764 1.726.203.00
3.1.2 Power supply A764 1.726.330.00
3.1.3 Pin assignment of power supply unit, explanation of abbreviations
3.2 TUNER MODULE
3.2.1 RF transformer, antenna selector switch and FM high pass
3.2.2 RF amplifier
3.2.3 Local oscillator/synthesizer
3.2.4 Mixer stage, IF filter and IF amplifier
3.2.5 Counter chip
3.2.6 FM demodulator and stereo decoder
3.3 CONTROL OF THE TUNER AND AF SECTION
3.4 AF SECTION
3.4.1 Output amplifier (on power supply module 1.726.330)
3.4.2 Line amplifier A764 1.726.300.00
3.4.3 RS 232 interface
3.5 FIELD STRENGTH INDICATOR AND MUTING CONTROL
3.5.1 Field strength indicator
3.5.2 Muting control
3.6 DIGITAL SECTION
3.6.1 Design
3.6.2 Microprocessor (B1)
3.6.3 Microprocessor B2
4. ALIGNMENT INSTRUCTIONS
4.1 MEASURING INSTRUMENTS, COMMENTS
4.1.1 Measuring instruments and aids
4.1.2 Abbreviations
4.2 PREPARATORY STEPS
4.3 TUNING SECTION (FM TUNER UNIT) 1.726.350.00
4.3.1 Fine-tuning voltage, local oscillator L12,CA39
4.3.2 Mixing voltage and oscillator buffer L10, CA75
4.3.3 Quartz frequency 4 MHz CA55
4.3.4 RF circuits DOUBLE L2, L3, L5, L6, L7, CA6, CA9, CA17, CA20, CA23
4.3.5 RF circuits SINGLE L14, CA62
4.3.6 Triple-tuned IF filter L15, L28, L27
4.3.7 First phase-linear IF filter L25, L26, L23, L24, L21,
4.3.8 Phase linear IF filter L30, L31, L32, L33, L34, L35, L36, L37
4.3.9 Second IF circuit L40
4.3.10 FM demodulator RA235, L41, RA250
4.3.11 Signal strength voltage RA160, RA340
4.3.12 Low-pass filter 15 kHz
4.3.13 Cauer low-pass filter 100 kHz L50, L52, L53, L51 4.3.14 Stereo decoder, 76 kHz oscillator RA288
4.3.15 Stereo decoder cross talk RA310, RA323
4.3.16 Calibration tone 400 Hz RA158
4.4 MICROCOMPUTER MODULE 1.726.278.20
4.4.1 Brightness control FIP display R67, R70
4.5 Power supply module 1.726.330.00
4.5.1 Basic FIP display brightness RA1
4.6 LINE AMPLIFIER 1.726.300.00
4.6.1 Output level RA1, RA2
4.7 RDS/ARI module 1.726.320.20 (option)
4.7.1 RDS decoder 4.7.2 ARI decoder
4.8 RDS DECODER 1.726.280.20 (option)
4.9 Multiplex/SCA amplifier module 1.726.310.00 (option)
4.9.1 Low-pass filter 75 kHz L1, L2 4.9.2 Output level RA3
4.9.3 Offset voltages RA1, RA2, RA4
5 Circuit Diagrams
6 Mechanical spare parts
7 OPTIONS
7.1 RDS/ARI module 1.726.320.20
7.1.1 Introductionel
7.1.2 Circuit description of RDS decoder
7.1.3 Description of ARI decoder
7.1.4 Deviation indicator (U DEV)
7.1.5 Signal strength indicator (SIG)
7.1.6 Modulation monitor (MOD)
7.1.7 Installation instructions for prof. RDS/ARI retrofit kit 1.726.021.00
7.2 REVOX RDS DECODER MODULE 1.726.280.20
7.2.1 Circuit description
7.2.2 Installation instructions for retrofit kit 21.726.280.20
7.3 MULTIPLEX/SCA AMPLIFIER MODULE 1.726.310.00
7.3.1 Circuit description
7.3.2 Pin assignment
7.3.3 Installation instructions for MPX/SCA amplifier
7.4 LEMO connector unit 1.726.362.20
7.5 REMOTE CONTROL TUNER A764 1.328.560.20
7.5.1 First time operation
7.5.2 Operator controls
7.5.3 Operating modes
7.5.4 Automatic RDS, start-up display mode (mode according to Section 7.5.3 B)
7.5.5 Error indication
7.5.6 Functional description
7.5.7 Mechanical design
8 APPENDIX
8.1 RADIO DATA SYSTEM, RDS
8.2 PROTOCOL RS232 INTERFACE
8.2.1 Introduction
8.2.2 Command input
8.2.3 Feedback
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