Sony TC-WR665S Service Manual

__TG-WATES/WRO65/WR665S
SERVICE MANUAL
Photo : TC-WR665S
US Model
TC-WA7ES/WR565/WR665S
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
TC-WR565/WR665S
* 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 symbol D0 and “HX PRO” are trademarks | Tape Transport Machanism | DECK A
of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism | TC-WR545/WR741
TC-WR565/WR665S :
TCM-190RA14CL
TC-WAT7ES : |
TCM-190RA12CL
DECK B | TCM-190RB12CL
SPECIFICATIONS
System
Recording system
4-track 2-channel stereo
Fast-winding time (approx.)
90 sec. (with Sony C-60 cassette)
Bias AC bias
Singnal-to-noise ratio (at peak level and weighted with Dolby NR off)
Type I tape, Sony Type I (NORMAL): 55 dB
Type IL tape, Sony Type II (HIGH) : 57 dB
Type IV tape, Sony Type IV (METAL) : 58 dB
S/N ratio improvement (approximate values)
With Dolby B NR on: 5dB at 1kHz, 10dB at 5kHz
With Dolby C NR on: 15dB at 500Hz, 20dB at 1kHz
With Dolby S NR on (TC-WA7ES/WR665SS only) :
10dB at 100Hz, 24dB at 1kHz
Harmonic distortion
0.4% (with Type I tape, Sony Type I (NORMAL) :
160 nWb/m 315 Hz, 3rd H.D.)
1.8% (with Type IV tape, Sony Type IV (METAL) :
250 nWb/m 315 Hz, 3rd H.D.)
Frequency response (Dolby NR off)
Type I tape, Sony Type I (NORMAL):
30-15,000Hz ( + 3dB, IEC)
Type II tape, Sony Type II (HIGH) :
30-17,000Hz ( + 3dB, IEC)
Type IV tape, Sony Type IV (METAL) :
30-18,000Hz ( + 3dB, IEC)
30-13,000Hz ( + 3dB, — 4dB recording)
Wow and flutter
TC-WA7ES/WR665S : + 0.13% W. Peak (IEC)
0.07% W. RMS (NAB)
+ 0.18% W. Peak (DIN)
+ 0.14% W. Peak (IEC)
0.08% W. RMS (NAB)
+ 0.19% W. Peak (DIN)
Variable pitch range (approx.)
— 30 to +30%
TC-WRS65 :
Inputs
Line inputs (phono jacks)
Sensitivity : 0.16V
Input inpedance : 47 kilohms
Outputs
Line outputs (phono jacks)
Rated output level : 0.5V at a load impeadance of
47 kilohms
Load impedance : Over 10 kilohms
Headphones (stereo phone jack)
Output level : ImW at a load impedance of 32 ohms
STEREO CASSETTE DECK
SONY.

Sony TC-WR665S Specifications

General

Track System	4-Track, 2-Channel Stereo
Tape Speed	4.8 cm/s
Motor	DC Servo Motor
Total Harmonic Distortion	0.8%
Power Supply	AC 120V, 60Hz
Type	Double Cassette Deck
Frequency Response (Normal Tape)	30 Hz - 14 kHz
Frequency Response (Chrome Tape)	30 Hz - 16 kHz
Frequency Response (Metal Tape)	30 Hz - 17 kHz
Wow and Flutter	0.07%
Output	Line Out
Inputs	Line In
Outputs	Line Out, Headphone
Dimensions	430 x 120 x 300mm

Summary

SPECIFICATIONS

System Specifications

Details on recording system, bias, noise ratio, distortion, and frequency response.

Wow and Flutter

Measurement of speed variations in tape playback.

Input/Output Specifications

Details on line inputs and outputs, sensitivity, and impedance.

SAFETY CHECK-OUT

Leakage Test Procedures

Methods to test and ensure electrical safety by measuring AC leakage current.

GENERAL INFORMATION

Identifying Front Panel Components

Labels and functions of controls and indicators on the front panel.

DISASSEMBLY PROCEDURES

Front Panel Disassembly

Steps to remove the front panel assembly and related components.

Mechanism Deck Disassembly

Procedures for disassembling the cassette mechanism deck.

Motor and Head Assembly Disassembly

Steps for removing capstan motor, reel motor, and head components.

ADJUSTMENT PROCEDURES

Mechanical Adjustments

Cleaning, demagnetizing, and torque measurement for mechanical parts.

Electrical Adjustments

Procedures for calibrating electrical performance using test signals.

Record/Playback Head Azimuth Adjustment

Aligning the playback head for optimal stereo separation and frequency response.

Tape Speed Adjustment

Calibrating the tape transport speed for accurate playback and recording.

Playback Level Adjustment

Setting the output signal level for correct playback volume.

Bias Consumption Current Adjustment

Adjusting current for head assembly or bias transformer replacement.

Record Level Adjustment

Setting the recording input level for optimal signal strength.

Record Bias Adjustment

Adjusting bias signal for proper tape recording characteristics.

ADJUSTMENT PARTS LOCATION

System Control Board Adjustment Points

Location of adjustment potentiometers on the system control board.

Audio Board Adjustment Points

Location of adjustment potentiometers on the audio boards for both decks.

Connector Board Adjustment Points

Location of adjustment potentiometers on the connector board.

IC TERMINAL EXPLANATIONS

IC Terminal Descriptions

Detailed explanation of each pin function for the main ICs used in the unit.

DIAGRAMS AND SCHEMATICS

Block Diagram

High-level overview of the unit's functional blocks and signal flow.

System Control Board Wiring

Printed wiring layout for the system control board.

System Control Schematic

Detailed circuit diagram for the system control section.

Audio Section Schematic

Detailed circuit diagram for the audio processing and playback sections.

Audio Section Wiring

Printed wiring layout for the audio boards of both decks.

Dolby S Section Wiring

Printed wiring layout for the Dolby S processing board.

Dolby S Section Schematic

Detailed circuit diagram for the Dolby S noise reduction circuitry.

EXPLODED VIEWS

Chassis Section Exploded View

Diagram showing the main chassis components and their assembly.

Front Panel Section Exploded View

Diagram illustrating the assembly of the front panel and its associated parts.

Mechanism Section 1 Exploded View

Diagram showing the exploded view of the primary cassette mechanism parts.

Mechanism Section 2 Exploded View

Diagram illustrating the exploded view of secondary cassette mechanism components.

ELECTRICAL PARTS LIST

Capacitors

List of capacitors used in the unit, including part numbers and specifications.

Resistors

List of resistors used in the unit, including part numbers and specifications.

Transistors

List of transistors used in the unit, including part numbers and types.

Integrated Circuits (ICs)

List of integrated circuits used in the unit, including part numbers.

Connectors and Other Components

List of connectors, coils, filters, and other miscellaneous parts.

HARDWARE LIST

Hardware Components

List of screws, bushings, and other hardware used in the assembly.