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TANDBERG 12 Service Manual

Tape recorder

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Table Of Contents

Table of Contents

Table of Contents
Technical Specification
Outputs
Speakers
Bass Control
Treble Control
The Function of the Controls
The Input and Output Terminals
The Input Terminals and the FM-MX Filter Switch
The Output Terminals and the Balance Adjustment
The Mechanism, Detailed Description and Adjustment Instruction
Microphone Inputs
Top View, with Top Cover Removed
The Operating Lever
The Motor Switch
Adjustments
T H E O P E R O L I N G L E V E R
The Eccentric Segment
The Pressure Wheel Assembly
The Upper Mounting Plate
The Pressure Wheel Assembly, Exploded View
Mounting of the Heads with the Pressure Wheel Assembly
The Lower Mounting Plate
The Tape Brake
The Trip Bar
The Turntable Assemblies
The Supply Turntable Assembly
The Tape Tight Tension
The Supply Pulley Disc with the Clutch Lever
The Take-Up Turntable Assembly
Horizontal and Vertical Alignments of the Turntables
Clutch Alignments
Fast Rewind
The Supply Turntable
The Take-Up Turntable
Fast Wind
Normal Forward Drive
Neutral
Free
The Motor Pulley
Threading of the Rubber Drive Belt
The Speed Transfer Wheel
The Lifting Mechanism
The Flywheel with the Capstan
The Brake for the Flywheel
The Speed Change Mechanism
The Momentary Start-Stop Feature
The Pressure Pad
The Automatic End of Switch
The Revolution Counter
Assembling the Top Cover
The Main Electronic Units, Block Diagram
Inputs
The Input Circuits
The Equalizing Amplifier in Record Position, Schematic
T H E P R E S S U R E W H E E L O S S E M B L y L
T H E T O P E B R O K E
T H E T R I P B O R T
T H E T U R N F O B L E O S S E M B L I E S T
F O S T R E W I N D L
N O R M Q L F O R W O R D D R I V E
T H R E O D I N G O F T H E R U B B E R D R I V E B E L T
T H E L I F T I N G M E C H O N I S
T H E F L y W H E E L W I T H I H E C O P S T O N
The Equalizing Amplifier in Playback Position
The Equalizing Amplifier in AMPLIFIER Position
The Power Output Amplifier
The Playback Pre-Amplifier
The Record Level Indicator Circuit
The Oscillator, Bias and Erase Circuit
The Power Supply
The Function Selector Switch
The Speaker Selector Switch
Monaural Recording on Ch. 1 or Ch. 2
Mixing During Monaural Recording
Stereo Playback
Stereo Amplifier
Stereo Recording
Head Alignment and Track Control with Tandberg Test Tapes
Sound on Sound
Preferred Instruction for Sound on Sound Recording
Head Alignment Without Tandberg Test Tapes
Demagnetizing
The Adjustable Tape Guides
The Erase Head
Track Control
Adjustment of the Output Level
Quiescent Current
The Bass Control
Adjustment of the Osc. Frequency and the Bias
Bottom View of the Tape Recorder
Connections
Distortion
Balance Adjustment for the Pre-Amp. Outputs
Adjustment of the Equalization Coils L1 and L2
Control of the Recording Curves
Control of the Playback Curves
Control of the Total Frequency Response
Power Output Control
Speed Test
Electrical Modifications Introduced to the Model 12 Tape Recorder
Modifications from Four-Track to Two-Track Models
Parts List
Mechanical Parts
T H E E Q U O L I Z I N G O M P L I F I E R I N P L O y B O C K P O S I T I O
L H E P O W E R O U L P U T O M P L I F I E R
T H E R E C O R D L E V E L I N D I C O T O R C I R C U I T
Electrical Parts
T H E R E C O R D / P L O y B O C K H E O D
Resistors
A D I U S T M E N T O F I H E P O W E R O U T P U F O M P L I F I E R
A D I U S F M E N T O F T H E O U T P U I L E V E L
T H E Q U I E S C E N T C U R R E N L
Lubricating
The Motor
The Self-Lubricating Bearings

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Service manual

MNDBERG

Tape recorder

modell 12

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