Onkyo TA-2058 User Manual

FA2058
OM-3230 -
STEREO CASSETTE
TAPE DECK
MODEL TA-2058
Black and silver model
SPECIFICATIONS
SAFTY-RELATED COMPONETN WARNING!! Track Format: 4 tracks, 2 channels
COMPONENTS IDENTIFIED BY MARK A ON Erasing System: AC erase
THE SCHEMATIC DIAGRAM AND IN THE PARTS Tape Speed: 4.8 cm/sec. (1-7/8 i.p.s.)
LIST ARE CRITICAL FOR RISK OF FIRE AND Wow & Flutter: 0.045% (WRMS)
ELECTRIC SHOCK. REPLACE THESE COM- Frequency Response: 20—17,000Hz (30—16,000Hz +3dB)
PONENTS WITH ONKYO PARTS WHOSE PARTS (normal position tape)
NUMBERS APPEAR AS SHOWN IN THIS MANUAL. 20—18,000Hz (30—17,000Hz +3dB)
(high position tape)
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EX-
POSED PARTS ARE ACCEPTABLY INSULATED
FROM THE SUPPLY CIRCUIT BEFORE RETURN.-
ING THE APPLIANCE TO THE CUSTOMER.
20—19,000Hz (30-—18,000Hz +3dB)
(metal position tape)
Signal-to-Noise Ratio: 60dB (metal position tape, Dolby
NR out)
A noise reduction of 10dB above
5kHz and 5dB at 1kHz is possible
with Dolby B NR. A noise reduction
of 20dB at 5kHz is possible with
Dolby C NR.
Input Jacks: Mic jacks: 2
Input sensitivity: 0.6mV/600
ohms
Input impedance 5.6 kohms
Line IN: 2
Input sensitivity: 60mV
Input impedance: 50 kohms
Outputs: Line OUT: 2
: Std output level: SOOmV (0dB)
Optimum load impedance:
over 50 kohms
Headphone Jack: 1
ONKYO.
AUDIO COMPONENTS

Onkyo TA-2058 Specifications

General

Track System	4-track, 2-channel stereo
Tape Type	Normal, CrO2, Metal
Output	0.5V (line)
Weight	6.5 kg
Type	Cassette Deck
Heads	1 Play, 1 Record, 1 Erase
Motor	DC servo motor
Signal to Noise Ratio	60 dB
Signal-to-Noise Ratio (Dolby B)	68 dB
Total Harmonic Distortion	0.8%
Input	Line In
Inputs	RCA
Outputs	RCA

Summary

ONKYO SERVICE MANUAL TA-2058

Specifications

Technical specifications for the TA-2058 Stereo Cassette Tape Deck.

Safety Warnings

Critical safety-related component warnings for fire and electric shock prevention.

Service Procedures

Maintenance and Setup

Procedures for replacing power supply cord, measuring resistance, and replacing lamps.

Key Features Overview

Highlights advanced features like 3-head system, Accubias, tape counter, and noise reduction.

Enhanced Tape Performance

Details the 3-head system and special hard permalloy for metal tape.

Intelligent Operation Systems

Explains Automatic Accubias and Dual Sensor Real Time Tape Counter functionality.

Advanced Audio Processing

Covers 2-Motor Tape Transport, Dolby B/C NR, and Dolby HX PRO.

Circuit Descriptions

DOLBY HX PRO CIRCUIT

Description of the Dolby HX PRO circuit operation and bias control.

PRESET ACCU BIAS OPERATION

Explanation of the Preset Accu Bias operation and adjustment method.

Component Descriptions

DA Converter and Data Setting

Details the D/A converter circuitry and data setting method.

Input Port Expander IC

Explains the function of the LC7800 Input Port Expander IC.

Microcomputer (LM6402H-425) Pin Functions

Chassis Exploded View

Chassis Exploded View Part List

Critical Components Warning

Note on critical components identified by mark for fire and shock risk.

Tape Mechanism-Parts List

Tape Mechanism-Exploded View

Adjustment Procedures

Core Performance Adjustments

Adjustments for tape speed, head azimuth, playback level, and bias current.

Record Level and Accu Bias Adjustment

Procedures for adjusting record level and ACCU BIAS oscillator.

Packing View and Accessories

Printed Circuit Board Parts Lists

Control, Main, and Peak Meter PC Boards

Parts list for Control, Main, and Peak Meter PC Boards.

Headphone Terminal PC Board Parts

Parts list for the Headphone Terminal PC Board.

Schematic Diagram - Amplifier Section

Schematic Diagram - Control Section

Block Diagram