Studer A80/VU MkI - Sync Channel Adjustment to NAB Standard; Level Adjustment of Sync Channel 15 and 7.5

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Contents2
Specifications7
Condensed Operating Instructions17
Mechanical Assembly17
Cable Installation18
Before Connecting Machine to Mains19
Earthing20
Function Check21
Adaptors for 1/4 Machines21
Amplifier Switching Playback-Record21
Adaptors for 1/2, 1 and 2 Machines22
Audio Connections23
Level23
Amplifier Remote Control23
Operation of Push Buttons24
Timing Indicator24
Push Button EDIT24
EDIT Control Knob25
Fast Tape Start25
Remote Control for Tape Deck26
Speed Variation of Capstan Motor26
Speed Variation Using External Power Supply27
Tape Transport28
Removal of Tape Transport Subassemblies28
Removal of the Aluminum Covers from the Tape Deck28
Removal of Capstan Motor30
Removal of Spooling Motors and Breaking Mechanism30
Removal of Headblock30
Removal of Pinch Roller Mechanism30
Removal of Tape Tension Sensor31
Removal of Tape Guide Roller Left31
Removal of Tape Guide Roller Assembly Right31
Removal of Mains and Speed Selector Switch31
Removal of Mains Unit32
General Abbreviations33
Signal Abbreviations33
Signal Designations33
Reference Designations33
Photo Transistor34
Transistor Connections34
Micro-Switch Connections34
Description of Operation of Tape Deck Controls35
Arrangement of Control Electronics35
Tape Deck Control36
Push Buttons36
Fader-Start36
Locking37
EDIT Button37
Fast Wind Monitoring38
Automatic Edit Operation38
Input Attenuator and Preamp39
Control Logic39
Tape and Switch40
Safety Circuit40
IC Memory and Counter41
Tape Movement Sensor Amplifier41
IC Memory42
Tape Direction Detector42
Pulse Generation for the Tape Timer43
Counting Direction Change over Logic43
Tape Timer Signal Regeneration43
IC Decoder and Drivers44
Tape Movement Simulation45
Spooling Motor Control47
Brake Control Amplifier49
Contactors50
Warning Flasher Circuit50
Capstan Servo51
Tape Transport Adjustments54
Mechanical Adjustments54
Mechanical Brakes54
Adjusting the Mechanical Brakes54
Mechanica Braking Force56
Capstan Pinch Roller Assembly57
Tape Tension Sensor60
Mechanical Adjustment of Tape Tension Sensor60
D.C. Power Supply Regulator Adjustment62
Power Transistors and Phase Shift Capacitors63
Tape Tension Adjustment64
Tape Tension, PLAY Mode64
Peak Tape Tension Limiting for Fastwinding Modes66
Tape Tension and Tension Symmetry, EDIT Mode67
Brake Control Electronics68
Capstan Motor Assembly Adjustment70
Master Bias Erase Oscillator72
Wiring Lists73
Groups73
Elements, Points77
Wire Marks77
Location Pin List78
Capstan Motor Capacitors79
Signal Wire List100
Type of Connecting Joints102
Function Description of Amplifier Electronics119
Record Preamplifier GR 51 el 2121
Record Adjustment GR 51 el 12121
Driver Channel for AF/BIAS122
Amplifier Channel for Erase Current122
Reproduce Channel123
Reproduce Preamplifier123
Sync. Preamplifier124
Reproduce Control Circuit126
VU Meter GR 51 el 8128
Stabilizer129
Oscillator129
Checking and Alignment of Amplifiers131
Reproduce Alignment to NAB Standard133
Reproduce Level Adjustment133
Reproduce Head Azimuth Adjustment134
Reproduce Frequency Response Equalization135
Sync Channel Adjustment to NAB Standard136
Level Adjustment of Sync Channel 15 and 7.5136
Recording Head Azimuth Adjustment137
Sync Frequency Response Equalization138
Record Alignment to NAB Standard139
Checking Erase Amplifier Adjustment140
Record Input Level Adjustment140
Bias Level Adjustment141
High Frequency Record Equalization143
Record-Reproduce Frequency Response Check144
Recorder Adjustment for Operation at Higher Flux Density145
Reproduce Amplifier Adjustment146
Record Amplifier Adjustment146
How to Identify Terminals147
Channel Supply Transformer162
Capstan Servo with Variable Speed Control165

Studer A80/VU MkI - Sync Channel Adjustment to NAB Standard; Level Adjustment of Sync Channel 15 and 7.5

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