Cassette Player

Page 26 (Adjustment of Magnetic Tape Heads and Pressure Rollers)

Studer a710 - Adjustment of Magnetic Tape Heads and Pressure Rollers; Preparations

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Table of Contents

Contents2
General7
Controls for Playback Mode7
Controls for Recording Mode8
Connectors8
Front Panel8
Rear Panel8
Connector Pin Assignment9
Care and Maintenance of Recorder9
Tape Transport Adjustments9
Audio Adjustments10
Disassembly11
Removing the Top Cover11
Removing the Bottom Cover11
Removing the Side Cover11
Removing the Top Crossie12
Removing the Keyboard and Display Pcbs12
Removing the Toggle Switches13
Removal of PEAK READING METER PCB13
Removing the Rear Cover13
Removing the Connector Panel Cover13
Unfastening the Spooling Motor Cover14
Tools and Aids15
Preliminary Steps and Checks15
Checking the Pinch Roller15
Checking the Pinch Roller Arms16
Checking the Position of the Centering Pin16
Checking the Dash Pot16
Adjusting the Pivoting Carrier17
Preparatory Steps18
Adjusting the Soundheads18
Adjusting the Erase Head19
Adjusting the Pinch Rollers19
Adjusting the Pinch Solenoid and the Dash Pot20
Capstan Motors21
Adjustments to the Tape Transport Electronics21
Measuring Instruments and Aids21
Adjusting the Light Barrier21
Tuning the Quartz Frequency22
Adjusting the Move Sensor23
Checking the Tape Motion23
Checking the Tape Tension24
Adjustment of Magnetic Tape Heads and Pressure Rollers26
Preparations26
Adjustment of Pressure Rollers27
Circuit Description of Main Assemblies29
Power Supply29
Microprocessor Control29
Capstan Motor Control30
Back Tension30
Tape Drive Chassis30
Interconnection30
Oscillator31
Dolby-C Encoder32
Input/Output PCB32
Peak Meter Electronics33
Stereo Balancing Unit33
RC Interface33
Checks34
Checking the Supply Voltage34
Checking and Adjusting the Signal Path Without Tape35
Checking and Calibrating the PEAK READING METER35
Checking and Adjusting the MPX Filters36
Checking the Signal-To-Noise Ratio36
Checking the Calibrating Button36
Measurements and Adjustments with Tape37
Adjusting the Reproduce Level37
Adjusting the Azimuth of the Reproduce Head37
Checking the Tape Selector Switch38
Checking the Reproduce Frequency Response38
Checking the Oscillator Frequency38
Adjusting the Azimuth of the Record Head39
Adjusting the Tape Bias39
Adjusting the Record Level and Equalization40
Measuring Various Characteristics40
Distortion40
Signal-To-Noise Ratio with Tape41
Erase Depth and Interchannel Cross Talk41
Wow and Flutter41
Boards Location43
Tape Drive/Block Diagram46
Back Tension PCB49
Program Preset Switches50
Toggle Switches PCB51
Remote Control Interface PCB52
Remote Control PCB53
Remote Control/External Wiring54
Counter Display PCB55
Keyboard57
Capstan Motor Control Block Diagram58
Capstan Motor Driver PCB61
Audio Block Diagram66
Wiring of Cassette Cooling Switches67
Service Wiring List96
Operating Section100
Cassette Tape Transport102
Technical Specifications108

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