Sony TC-K670 Service Manual

Photo: TC-K677ES
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 (Permalloy head)
Playback head x 1 (LA head)
Motors Capstan motor x 1
(DC servo motor)
Reel motor x 1 (DC motor)
ASIST(mechanical drive) motor x 1
(DC motor)
Signal-to-noise ratio (at peak level)
oe ON ON
Type lV(Sony METAL-SLT/S)
Type II(Sony UX-S)
Total harmonic distortion
1.0% (with Sony METAL-SLT/S
cassette)
Frequency response (DOLBY NR OFF)
20—21,000 Hz (+3 dB, IEC)
20-—16,000 Hz
[+3 dB OVU (-4dB) recording]
20-19,000 Hz (+3 dB, IEC)
Type IV cassette
(Sony METAL-SLT/S)
Type II cassette
(Sony UX-S)
Type | cassette
| (Sony HF-S)
Wow and flutter
20—17,000 Hz (£3 dB,IEC)
pia
+0.09% W.Peak (IEC)
0.05% WRMS (NAB)
+0.14% W.Peak (DIN)
Dolby Laboratories Licensing Corporation.
ma} Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol! 0] are trademarks of
Canadian Model
AEP Model
UK Model
E Model
TC-K570
US Model
AEP Model
TC-K670
US Model
Canadian Model
UK Model
TC-K677ES
Model Name Using Similar Mechanism
Line inputs Sensitivity 77.5 mV
(phono jacks) input impedance | 47 k ohms
CD DIRECT INPUT! Input impedance | 47k ohms
Outputs
Tape Transport
Mechanism Type
Inputs
0.32 V at a load
impedance of
47 k ohms
Over 10 k ohms
0-1.25 mW ata
load impedance
of 32 ohms
Line outputs
(phono jacks)
Rated output levei
Load impedance
Headphones
(stereo phone
jack)
Output level
General
Power requirements US,Canadian model: TC-K570: 120V AC 60Hz 18W
TC-K670, K677ES:120V AC 60Hz 19W
AEP, Germany model: 220VAC~ 50/60Hz
UK model: 240VAC~50/60Hz
E model: 120, 220, 240VAC~50/60Hz 18W
Power consumption 19 W
Dimensions Approx. 430 x 123 x 300 mm (w/h/d)
(17 x 4’ x 117 inches)
including projecting parts and controls
Weight Approx. 4.9 kg (10 ibs 13 oz)
Supplied accessories
Audio connecting cords (2)
Design and specifications subject to change without notice.
Note
This appliance conforms with EEC Directive 87/308/EEC
regarding interference suppression.
STEREO CASSETTE DECK
ONY.
Dolby noise reduction manufactured under license from

Sony TC-K670 Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.8 cm/s
Tape Types	Normal, Chrome, Metal
Output	0.5V (line)
Inputs	Line In
Type	Cassette Deck
Heads	3 (Record, Playback, Erase)
Noise Reduction	Dolby B, C
Frequency Response	20 Hz - 20 kHz
Wow and Flutter	0.04% (WRMS)
Outputs	Line Out, Headphone

Summary

Specifications

Recording and Playback Specifications

Details on recording system, fast-winding, bias, heads, motors, and signal-to-noise ratio.

Performance Specifications

Covers total harmonic distortion, frequency response, and wow/flutter for different tape types.

Safety and Leakage Testing

Safety Check-out Procedure

Instructions for performing safety checks on exposed metal parts for AC leakage.

Leakage Test Methods

Outlines three methods for measuring AC leakage current according to safety standards.

Component Safety Warning

Identifies critical safety components and specifies replacement guidelines.

Front Panel Controls and Indicators

Front Panel Control Identification

Lists and describes all front panel buttons, switches, indicators, and controls.

Disassembly Procedures

Mechanism Block Disassembly

Mechanical Adjustments

Precautions and Preparation

Tape Path Adjustment

Procedure to adjust tape path for optimal performance and prevent tape curling.

Mechanical Adjustment Procedures

Pinch Roller and Head Height Adjustment

Steps for adjusting pinch roller and record/playback head height for proper tape tracking.

Head Declination and Azimuth Adjustment

Procedures for setting head declination and preliminary azimuth alignment for optimal playback.

Tape Path and Waveform Check

Mechanical Adjustment Details

Erasehead Adjustment Procedures

Steps for adjusting erasehead azimuth, height, and depth for effective tape erasure.

Torque and Pinch Roller Force Specifications

Electrical Adjustments

General Settings and Record/Playback Azimuth

Playback Output Level Matching

Steps to adjust and match output levels for L-CH and R-CH, ensuring consistency within 1 dB.

Electrical Adjustment Procedures

Tape Speed and Bias Current Adjustment

Procedures for adjusting tape speed using a frequency counter and bias consumption current.

Playback Level and Record Bias Adjustment

Methods for adjusting playback levels using test tapes and setting record bias parameters.

Electrical Adjustment Details

Record Level Adjustment

Procedure for setting and confirming record signal levels to meet specified adjustment limits.

Erase Current Adjustment

Steps to adjust erase current and verify the erasehead frequency for optimal performance.

Diagrams and Schematics

Schematic Diagrams

Detailed circuit schematics for the Audio Section and System Control Section.

Electrical Parts List - Boards and General Components

FL(A) and Main(A) Board Parts

Electrical Parts List - Diodes, ICs, and Filters

Transistors

Electrical Parts List - Resistors (R101-R262)

Electrical Parts List - Resistors (R263-R581)

Electrical Parts List - Resistors (R582-R735)

Electrical Parts List - Resistors (R736-R826)