Sony TC-765 Service Manual

GENERAL
Power Requirements:
Power Consumption:
AC Outlet:
Dimensions:
Weight:
Track:
Tape Speed:
SPECIFICATIONS
Fast Forward and
120V ac, GOHz (US, Canadian model} Rewind Time:
110V, 120V, 220V, 240V ac, 50/60 Hz
(UK, AEP, PX model)
110W (US, Canadian modei)
Q9OW (UK, AEP model)
80W (PX model)
Recording Time:
300W, unswitched (US, Canadian model) Heads:
Approx. 445 (w) x 525 (h) x 235 (d) mm
17 1/2 (w) x 205/ (h) x 91/4 (d) inches Motors:
including projecting parts and controls
26.5 kg, 58 !b 7 oz (US, Canadian model) Reel:
27 kg, 58 1b 8 oz (UK, AEP, PX model)
4-track 2-channel stereo recording and playback
19 cm/s (7% ips)
9.5cm/s (3% ips)
Approx. 150 seconds with 740 m (2,400 ft) tape
With 1,100 m (3,600 ft), 27cm reel
Stereo recording
180 minutes at 19cm/s
Mono recording
720 minutes at 9.5 cm/s
Record head 1, Playback head 1
Erase head 1
AC servo-controiled capstan motor 1
Induction reel motor 2
Up to 27cm (10%-inch)
— Continued on page 2 —
SERVICE MANUAL

Sony TC-765 Specifications

General

Brand	Sony
Model	TC-765
Category	Tape Deck
Language	English

Summary

Specifications

General Specifications

Lists power requirements, consumption, dimensions, and weight.

Performance Specifications

Electrical Performance Metrics

Details frequency response, wow/flutter, S/N ratio, distortion, and equalization.

Input/Output and Model Details

Describes input/output jacks, remote connector, and model identification labels.

Section 1: Outline Diagrams

Block Diagram - System Control Section

Visualizes the system control circuit architecture.

Section 1: Amplifier Block Diagram

Block Diagram - Amplifier Section

Illustrates the amplifier circuit's functional blocks.

Section 2: Disassembly and Repair

Notes on Repair and Tape Recommendations

Provides repair guidelines, safety notes, and tape bias/EQ settings.

Component Removal Procedures

Step-by-step instructions for dismantling unit components.

Section 3: Mechanical Adjustments

Tape Path and Head Height Adjustments

Focuses on aligning tape path and setting head heights for optimal playback.

Roller, Brake, and Torque Adjustments

Covers pinch roller position, brake system calibration, and torque settings.

Tension and Back Tension Adjustments

Details supply reel back tension and forward/rewind back tension adjustments.

System Control Checks

Settings and Operational Verification

Outlines required settings and step-by-step checks for system control functions.

Electrical Adjustments

Standard Record and Switch Settings

Defines standard settings for recording and switch positions for adjustments.

Voltage, Head, and Level Calibration

Covers B+ voltage, tape speed, head angle, and playback level adjustments.

Bias, Equalizer, and Meter Calibration

Details bias, equalizer, and VU meter calibration procedures.

Section 4: Diagrams

Amplifier Section Diagrams (US, Canadian)

Presents mounting and schematic diagrams for the US/Canadian amplifier section.

Amplifier Section Diagrams (UK, AEP, PX)

Shows mounting and schematic diagrams for the UK/AEP/PX amplifier section.

System Control Section Diagrams (Page 25, 27)

Illustrates mounting and schematic diagrams for the system control section.

Section 5: Exploded Views

Exploded View Layouts (Pages 33-37)

Detailed visual breakdown of unit components for service and replacement.

Section 6: Parts Lists

Electrical Components List (Pages 38-40)

Lists semiconductors, ICs, diodes, resistors, jacks, fuses, and switches by part number.

Accessories and Hardware (Page 41, 42)

Details included accessories, packing materials, and hardware nomenclature.

Circuit Descriptions (Supplement)

IC701 Function and Mode Control

Explains IC701 operation and how function buttons control tape transport modes.

Power Supply and Motor Control Circuits

Describes power supply sections and reel motor starting/tension circuits.

Tension and Back Tension Adjustment Circuits

Details mechanical tension regulation and back tension adjustment circuits.

Control, Muting, and Bias Oscillator Circuits

Covers STOP, TIMER, muting, and bias oscillator circuit operations.

Function Button Action Charts

Illustrates sequential operations for function buttons and their timing.