Sony TC-K990ES Service Manual

TC-K333ESA/K9S0ES
SERVICE MANUAL
* Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories Licensing
Corporation. HX Pro originated by Bang & Olufsen.
“DOLBY”, the double-D symbo! DO and "HX PRO” are trademarks
of Dolby Laboratories Licensing Corporation.
SPECIFICATIONS
Recording system 4-track 2-channel stereo
Fast winding time Approx. 90 sec. (with Sony C-60 cassette)
Bias AC bias
Heads Erasing head x 1 (S&F head)
Recording head x 1 (LA head)
Playback head x 1 (LA head)
Motors Capstan motor x 1
(direct -drive linear torque BSL motor)
Reel motor x 1 (DC motor)
Type IV (Sony
Signal-to-noise ratio (at peak level)
Type Il Type |
Metai-S) (Sony UX-S) (Sony HF-S)
61 dB 59 dB 57 dB
Measured at peak level weithted without NR. The S/N is improved by about
15 dB at 500 Hz and by about 20 dB about 1 kHz with Dolby-C NR on, and by
5 dB at 1 kHz and by 10 dB about 5 kHz with Dolby-B NR on.
Cassette
(Dolby NR OFF)
1.3% (with Sony Metal-S 250 nWb/m, 315 Hz,
3rd H:D.)
Frequency response (Dolby NR OFF)
Type IV cassette 15 - 22,000 Hz (+3 dB, IEC)
(Sony Metal-S) 15 - 16,000 Hz [+3 dB (-4dB recording)]
Type Il cassette 15 - 20,000 Hz (#3 dB, IEC
(Sony UX-S)
Type | cassette 15-4 Hz (+3 dB. |
(Sony HF-S) 8,000 Hz (+3 dB, IEC)
+ 0.04% W.Peak (IEC)
0.022% W.RMS (NAB)
+ 0.065% W.Peak (DIN)
Line inputs Sensitivity 0.16 V
(phono jacks) Input impedance 47 k ohms
CD DIRECT INPUT Input impedance 47 k ohms
Harmonic distortion
Wow and flutter
Inputs
Model Name Using Similar Mechanism TC-K333ESG
Tape Transport Mechanism Type
AEP Model
TC-K990ES
E Model
TC-K333ESA
TCM-200D10
Outputs
Line outputs
(phono jacks)
Rated output level 0.5 V at a load impedance
of 47 k ohms
Load impedance Over 10 k ohms
Output level 0-3 mW ata load
impedance of 32 ohms
AEP model: |
220 - 230 V AC, (or 240 V AC
adjustable by Sony personnel),
50/60 Hz
E model:
120, 220, or 240 V AC adjustable,
50/60 Hz
Power consumption 31 W
Dimensions Approx. 470 x 140 x 380 mm (w/h/d)
(185% x 55% x 15 inches)
including projecting parts and controls
Approx. 12.0 kg (26 lbs 8 oz)
Model for other countries: Approx. 11.2 kg
Headphones
(stereo phone jack)
General
Power requirements
Weight
Supplied accessories Audio connecting cords (2)
Screws (8)
Wireless remote commander (1)*
Sony SUM-3(NS) batteries (2)*
* Not supplied with model for European countries
Design and specifications are subject to change without notice.
Note
This appliance conforms with EEC Directive 87/308/EEC regarding
interference suppression.
STEREO CASSETTE DECK
SONY.

Sony TC-K990ES Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.76 cm/s
Motor	DC Servo Motor
Wow and Flutter	0.04% WRMS
Type	Stereo Cassette Deck
Heads	2 x Playback, 1 x Record, 1 x Erase
Tape Types Supported	Type I (Normal), Type II (Chrome), Type IV (Metal)
Frequency Response	20 Hz to 20 kHz
Input	Line Level
Output	Line Level
Inputs	Line In
Outputs	Line Out (RCA), Headphones

Summary

Specifications Overview

Servicing Notes and Voltage Check

Flexible Circuit Board Repair Guidelines

Guidelines and precautions for repairing flexible circuit boards.

Operating Voltage Verification Procedure

How to verify and set the unit's operating voltage.

Remote Control and Recording Calibration

Optimizing Recording with Calibration

Step-by-step guide to bias and recording level calibration.

Recording Calibration Procedure

Bias and Recording Level Adjustment Steps

Step-by-step guide for adjusting bias and recording level.

Advanced Recording Techniques

Recording Equalization Calibration Guide

Instructions for calibrating recording equalization for different sound profiles.

Understanding the Dolby HX PRO System

Details the Dolby HX PRO system for enhanced recording quality.

Section 2: Disassembly Procedures

Cassette Holder and Pinch Lever Disassembly

Section 3: Adjustment Procedures

Mechanical Adjustment Precautions and Definitions

Safety notes and definitions for mechanical adjustments.

Tape Path and Head Adjustments

Guide for aligning tape path and adjusting heads.

Advanced Mechanical Adjustments

Head Declination, Azimuth, and Depth Tuning

Fine-tuning head declination, azimuth, and depth for tape path.

Erasehead Alignment Procedures

Steps for adjusting the erasehead's azimuth and height.

Mechanical Adjustments and Electrical Setup

Head Depth, Pinch Roller Force, and Torque Adjustments

Adjusting head depth, pinch roller force, and torque specifications.

Electrical Adjustment Preparation and Notes

Setup for electrical calibration and general notes.

Electrical Adjustments: Recording and Playback

Standard Recording Levels and Azimuth Adjustment

Setting standard levels and adjusting head azimuth.

Playback Level and MPX Filter Calibration

Electrical Adjustments: Phase, Bias, and CrO2 Calibration

Phase Check and Bias Oscillator Adjustment

Verifying phase and adjusting bias oscillator frequency.

Bias Current and CrO2 Tape Calibration

Calibrating bias current and record levels for CrO2 tapes.

Electrical Adjustments: Bias, Meter, and Calibration

Metal and Normal Bias Adjustments

Procedures for adjusting bias on metal and normal tapes.

Meter Level and Calibration Adjustments

Calibrating meter levels and oscillator settings.

Overall System Block Diagram

Section 5: Exploded Views

Overall Unit Exploded View

Section 6: Electrical Parts List

AC SW, Capstan, and Comparator Parts