Table Of Contents - Studer A700 Service Manual

Table of Contents

Contents4
Technical Specifications8
Dismantling10
Required Tools10
Removal Of Top Cover10
Removal Of Front Panel10
Removal Of Base Cover11
Removal Of Audio-Mixer Section11
Removal Of Mains Transformer12
Removal Of Head Assembly13
Removal Of Tape Tension Control Circuits13
Removal Of Left-Hand Tape Tension Sensor Assembly14
Removal Of Right-Hand Tape Tension Sensor Assembly14
Removal Of Capstan Motor14
Removal Of Brake Assembly15
Removal Of Spooling Motors15
Removal Of Tape Lift Solenoid16
Removal Of Pinch Roller Mechanism16
Removal Of Tape Timer16
Removal Of Power Transistors17
Removal Of Capstan Motor Speed Control17
Removal Of Tape Transport Control17
Re-Assembly18
Removal Of Components From Audio-Mixer Section18
Removal Of Vu-Meter Amplifier18
Removal Of Headphone Amplifier19
Removal Of Input Transformer Board19
Removal Of Vu-Meter19
Removal Of Tone Control Board20
Removal Of Input Amplifier20
Instructions For Re-Installation Of The Input Amplifier20
Re-Installation Of Tone Control Board20
Replacement Of A Linear Motion Finder Or A Phone Socket21
Transport Mechanism22
Sound Head Mounting22
Brakes22
Braking Torque22
Brake Adjustment23
Pinch-Roller24
Measuring Pinch-Roller Pressure24
Re-Adjustment Of Pinch-Roller Mechanism25
Replacement Of Pinch-Roller And Tape Tension Sensing Rollers25
Tape Lift Solenoid26
Adjustment Of Tape Lift Solenoid26
Removal Of Capstan Shaft And Thrust Bearing26
Spooling Motors, Replacement Of Bearing27
Lubrication27
End-Of-Tape Switch27
Electrical Adjustments28
General28
Test Equipment28
Demagnetization28
Tape Transport Adjustments29
Preparations29
Adjustment Of Capstan Motor Speed29
Adjustment Of Tape Tension Sensors29
Function-Check On Spooling Motor Control Circuits30
Adjustment Of Photo-Sensitive End-Of-Tape Switch31
Audio-Mixer Adjustments32
Gain Of Input Amplifiers32
Vu-Meter Calibration32
Sensitivity Of Peak Level Indicators33
Testing The Mono33
Testing The Mono-Stereo Switching Of The Mode Selector34
Frequency Response Of Input Channels35
Playback Adjustments36
Playback Head Azimuth36
Playback Level From Calibration Tape36
Playback Head Azimuth, Fine Adjustment37
Playback Frequency Response38
Checking Oscillator Frequency And Rf-Voltage38
Oscillator Frequency39
Record Head Azimuth39
Bias Adjustment40
Record Level41
Record Equalization42
Record Head Azimuth, Fine Adjustment42
Frequency Response Overall43
Measurement Of Various Performance Data44
Distortion Via Tape44
Weighted Noise Measurement Via Tape45
Erase Efficiency46
Crosstalk-Mono46
Crosstalk-Stereo48
Output Level Measurements49
Additional Measurements On The Audio Mixer49
Performance Of Phono Amplifier49
Performance Of Tone Controls50
Input And Output Signal Levels52
Wow And Flutter52
Electronics72
Tape Transport Electronics72
Mains Transformer72
Power Supply72
Tape Transport Control73
Tape Motion Sensor74
Tape Tension Sensor74
Capstan Speed Control75
Audio Mixing Section76
Input Tansformers77
Input Amplifiers77
Tone Control78
Headphone Amplifier78
Interconnect Board79
Sound Head Electronics79
Basis Board80
Oscillator80
Record Amplifier81
Reproduce Amplifier82
Headblock Assembly82
Diagrams83
Mains Transformer Assembly84
Specifications89
Sensor Board, Right98
Sensor Board, Left99
Wiring Lists184
Groups184
Elements, Points185
Location Pin List185
Signal Wire List186
Type Of Connecting Joints187