Teac C-1 User Manual

Stereo Cassette Deck with Dolby System
GENERAL INTRODUCTION
This manual has been written to help the skilled service
technician to service and repair the TEAC C-1 Stereo
Cassette Deck. It is a highly sophisticated deck incorporat-
ing many advanced features to satisfy the demands of the
purist. These include three motors, three heads, dual capstan
drive, plug-in bias/EQ cards, peak level meters, electronic
signal switching and many more.
The data given in this manual should enable the competent
technician to maintain the professional standards of which
this deck is capable. However, if any of the adjustments or
repairs are too difficult or complicated to accomplish,
please contact the nearest TEAC Factory Service Department
or write directly to a TEAC office. TEAC addresses are print-
ed on the back cover of this Service Manual.
NOTE: When ordering replacement parts, please refer to
the PARTS LIST which is printed separately from
this manual and included as an insert.
TEAC CORPORATION
51032320,

Teac C-1 Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.76 cm/s
Dimensions	435 x 110 x 286mm
Weight	4.8kg
Type	Cassette Deck
Tape Type	Metal
Signal-to-Noise Ratio	52dB
Wow and Flutter	0.05% (WRMS)

Summary

GENERAL INTRODUCTION

PARTS LOCATION

SPECIFICATIONS & SERVICE DATA

TEST EQUIPMENT

SPECIAL TOOLS AND JIGS

Lists special tools and jigs required for servicing.

ILLUSTRATED DISASSEMBLY PROCEDURES

CASE AND FRONT PANEL

Details disassembly steps for the case and front panel.

TAPE TRANSPORT CHASSIS

Details disassembly steps for the tape transport chassis.

MECHANICAL CHECKS AND ADJUSTMENTS

CASSETTE HOLDER TIMING ADJUSTMENT

Procedure for adjusting the cassette holder timing.

HEAD SOLENOID POSITION ADJUSTMENT

Procedure for adjusting the head solenoid position.

CAPSTAN ASSEMBLY THRUST ADJUSTMENT

Procedure for adjusting the capstan assembly thrust.

ELECTRICAL CHECKS AND ADJUSTMENTS

GENERAL PRELIMINARY INFORMATION

General notices and preparations for electrical checks.

DC VOLTAGE (+15 V) ADJUSTMENT

Procedure for adjusting the +15V DC voltage.

PLAYBACK PERFORMANCE

RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT

Procedure for adjusting the record/playback head azimuth.

SPECIFIED OUTPUT LEVEL SETTING

Procedure for setting the specified playback output level.

MONITOR PERFORMANCE

MINIMUM INPUT LEVEL CHECKS

Checks for minimum input signal levels.

PEAK LEVEL METER ADJUSTMENTS

PEAK LEVEL METER CALIBRATION (RECORD)

Calibration procedure for peak level meter indication.

RECORDING PERFORMANCE

BIAS TRAP ADJUSTMENTS

Procedure for adjusting the bias trap circuits.

RECORD BIAS SETTING ADJUSTMENT

Procedure for setting the record bias.

FREQUENCY RESPONSE - OVERALL

Procedure for checking overall frequency response.

ERASE EFFICIENCY

Procedure for checking erase efficiency.

DOLBY NR EFFECT MEASUREMENT

ADJUSTMENT AND TEST POINT LOCATIONS

BLOCK DIAGRAM

LEVEL DIAGRAM

VOLTAGE AND FREQUENCY SETTING

VOLTAGE SELECTOR SETTING PROCEDURE

Procedure for setting the voltage selector.

CIRCUIT DESCRIPTION

TAPE TRANSPORT SECTION

SYSTEM CONTROL LSI

Description of the system control LSI.

INPUT-OUTPUT CONDITIONS AND TERMINALS

Details input/output conditions and terminals of the LSI.

OPERATION

Explanation of tape deck operation and signal priorities.

CONTROL P.C.B.

INITIAL POWER RESET CIRCUIT

Description of the initial power reset circuit.

SOLENOID DRIVE CIRCUIT

Explanation of the solenoid drive circuits.

TAPE LOADING CIRCUIT

Description of the tape loading circuit.

FAST FORWARD AND REWIND

Details on fast forward and rewind operations.

CAPSTAN MOTOR CIRCUIT

REEL MOTOR CONTROL P.C.B.

PLAY MODE

Explanation of operation in Play mode.

PAUSE MODE

Explanation of operation in Pause mode.

AMPLIFIER SECTION

INTRODUCTION

Overview of the amplifier section.

SIGNAL SWITCHING CIRCUIT

Description of the signal switching circuits.

PLAYBACK AMPLIFIER P.C.B.

PLAYBACK EQUALIZER AMPLIFIER

Description of the playback equalizer amplifier.

PLAYBACK LINE AMPLIFIER

Description of the playback line amplifier.

RECORDING AMPLIFIER P.C.B.

OSC P.C.B.

BIAS OSC CONTROL CIRCUIT

Description of the bias oscillator control circuit.

DOLBY ENCODER/DECODER

ENCODER

Description of the Dolby encoder circuit.

POWER MUTING CIRCUIT

PARTS LIST

EXPLODED VIEWS AND PARTS LIST

Provides exploded views and lists of parts.