Studer A810 - Bias Adjustments

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Contents2
General References Contents3
Quick-Reference Description4
Standard Versions6
A810-1 Full Track Versions6
Stereo Versions7
A10-2/2 2-Track Versions8
Options10
Varispeed10
Channel Control10
Tape Scissors, Tape Marker10
Accessories11
Standard Accessories11
Console11
Tape Transport Remote Control11
Studer Cleaning Kit in Carrying Case12
Aluminium Case for A81012
Tool Case12
Additional Manuals12
Technical Specifications13
Dimansions19
A81019
Console of A81020
Packing21
Air Freight21
Ocean Freight21
Level Diagrams22
Standard Calibration Values25
Maintenance Hints for the Service Personnel26
Abbreviations26
Powers of Ten27
Code Letters and Colors27
Resistors27
Capacitors28
Molded RF Coils28
Electostatically Sensitive Semiconductor Devices29
Inductors, Transformers on Ferrite Cores29
Installation, Putting into Operation Contents30
Unpacking and Testing31
Place of Installation31
Installing the Tape Recorder31
Portable Versions31
Installation into Console32
Procedure33
Connector Panel34
AV Power, Voltage Selector34
Line Input35
Line Output35
Connectors for VU-Meter Panel36
Remote Control Connectors37
Remote Control Circuit38
Varispeed Control38
Fader Start Circuit38
Headphones Socket39
Operating Instructions40
Controls40
Output Selector Switches41
Track Mode Selector Switches41
Power Switch42
Tape Timer42
Pilot Lamps42
Mounting the Tape43
Three-Pronged Reel with Flange43
NAB Reel43
Self-Supporting Pancake43
Threading the Tape44
Tape Speeds45
Play Mode45
Recording45
Recorders with Safe/Ready Switch45
Sync Reproduction46
Spooling Mode46
Drop out from Record Mode46
Drop-In46
Stop Mode47
Decreasing the Spooling Speed47
Tape Lift47
Autolocator48
Dump Editing48
Play Preselection48
Monitor49
VU-Meter Panel49
Output Selector49
Remote Controls50
Mono-Stereo Switch50
Test Generator50
Time Code Channel51
Time Code Recording51
Time Code Reproduction51
Editing, Splicing52
Procedure for Searching a Tape Address52
Searching a Tape Location with Spoiling52
Search with Play52
Cutting the Tape53
Search with Autolocator53
Cutting at the Reproduce Head53
Marking the Tape53
Splicing the Tape54
Splicing Block with Cutting Groove54
Built-In Tape Scissors54
Degraded Operation55
Error Messages Appearing on the Tape Timer Display55
Operation with Serial Interface57
Studio Bus57
Data Protection57
Serial Interface RS 23257
Instruction Set58
Daily Care61
Cleaning the Anti-Scrape Flutter Roller61
Power Supply, Tape Transport Control Contents62
Functional Description63
Power Supply63
Line Voltages63
Internal Supply Voltages63
MP Unit GR 20 el 0167
Microprocessor67
External Memories67
Reset67
Tape Deck Controller GR 20 el 0268
Bus Converter GR 20 el 0568
Interrupt68
Periphery Controller GR 20 el 0469
Command Unit GR 2170
Serial Remote Controller GR 20 el 0370
Tape Timer Display70
Saving the Audio Parameters on Tape70
Capstan Motor Control GR 2671
Spooling Motor Control GR 2471
RS 232 Terminals71
Debug Display71
Tape Tension Sensors GR 27, GR 2873
Removing the Tape Transport Assemblies75
Covers75
Headblock Cover75
Head Cover75
Cover of the Tape Tension Sensor76
Tape Transport Cover76
Rear Cover, Upper77
Rear Cover, Lower77
Top Cover78
Panel Flap78
Headblock79
Wooden Side Panels79
Tape Tension Sensors80
Left-Hand Tape Tension Sensor80
Pressure Roller Assembly81
Right-Hand Tape Tension Sensor81
Tape Lift Assembly82
Lifter Assembly82
Lifter Solenoid82
Tape Brakes83
Spooling Motors84
Spooling Motor Control84
Capstan Motor85
Power Supply Unit85
Monitor Unit86
Mechanical Adjustments87
Preparatory Steps87
Basic Adjustment of the Brake Chassis88
Adjusting the Edit Solenoid88
Adjusting the Brake Solenoid89
Measuring the Braking Torques89
Pressure Unit90
Adjustment90
Checking the Pressure Roller Force91
Adjusting the Tape Lift Solenoid92
Checking the Mechanical Functions93
Mobility of Bearing and Dashpot93
Damping93
Checking the Tape Travel93
Edit Solenoid94
Adjusting the Tape Tension Spring95
End-Of-Tape Sensor96
Adjusting the Dashpot97
Replacing the Soundheads99
Tape Guidance101
Anti-Scrape Flutter Roller101
Electrical Adjustments102
Checking the Supply Voltages102
Neutral Position103
End Deflection103
Max. Deflection103
Tape Move Sensor104
Tape-End Sensor104
Tape Tension Adjustments104
Checking the Tape Timer104
Capstan Motor Control105
Peak Tape Tension105
Final Check105
Adjustments106
Check Measurements106
Exchanging the Capstan Motor or the Capstan Motor Control106
Centering the Capacitative Sensor107
Circuit Descriptions110
Stabilizer GR 07110
Monitoring the Supply Voltages111
Monitoring the Line Voltage111
Tape Move Sensor GR 28 el 05114
Liquid-Crystal Display (LCD)121
Serial Remote Controller GR 20 el 03122
Tape Timer Display (LED Version)122
Copying Data on Tape122
Expanded Test System123
Pulse Width Modulator125
Limiting the Spooling Speed126
Spooling Motor Output Stage126
Tape Move Sensor GR 28, el 05127
Tape End Sensor GR 27 el 04, GR 28 el 06127
Audio Contents128
Audio Block Diagram130
Line Amplifier GR 20 el 11, el 16, Input and Output Terminals131
Reproduce Amplifier GR 20 el 10, el 15; Preaqmplifier in Headblock132
Mono-Stereo Switch GR 20 el 12133
HF Driver GR 20 el 08, el 13134
Recrd Amplifier GR 20 el 09, el 14135
Code Read/Write Unit GR 20 el 06137
Code Delay Unit GR 20 el 07139
Calibration140
Reproduction140
Level141
Equalizations141
Magnetic Reference Flux141
Calibration Tapes142
Reference Level Test Section142
Azimuth Alignment Test Section142
Frequency Response Test Section142
Line Level143
Checking the Output Level and the VU-Meter143
Tape Bias144
Input Keyboard145
Readout of Programmed Value145
Modifying the Parameters147
Storing the Parameters147
Reproduce Adjustments148
Reproduce Level Adjustment148
Error Message EE02 or EEE02148
Azimuth Alignment of the Reproduce Head149
Checking the Level149
Frequency Response Adjustment150
Theoretical Equalization Adjustment150
Record Adjustment151
Adjustments for the Slow Tape Speed151
Record Level Preadjustment152
Aligning the Azimuth of the Record Head152
Bias Adjustment153
Azimuth Alignment Stereo153
Record Level Adjustment153
Cross Talk Adjustment154
Sync Adjustments155
Checking the Height of the Heads157
Adjusting the Height of the Right-Hand Code Head159
External Storage of the Audio Parameters162
Principle of Saving the Audio Parameters162
Connecting the Cassette Recorder to the Remote Control Connector162
Saving the Audio Parameters163
Verification164
Reading in the Audio Parameters through the Serial Remote Interface165
Loading the Audio Parameters165
Programming the Operating Parameters166
Code Switches of the Command Unit166
Code Switches Periphery Controller169
Jumper Reproduce Amplifier172
Jumper VU-Meter Amplifier172
Jumper and Code Switches Serial Remote Controller173
Code Switches Serial Interface174
VU-Meter Panel Internal or External174
Jumpers Mono/Stereo Switch And/Or Test Generator175
Jumper Time Code Read/Write Unit176
Jumpers Tape Deck Controller177
Jumpers Capstan Motor Control178
Bias Adjustments179

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