Sony TC-766-2 - Service Manual

GENERAL
Power Requirements:
Power Consumption:
AC Outlet:
Dimensions:
Weight:
Track:
Tape Speed:
SPECIFICATIONS
Fast Forward
120V ac, 60Hz (US, Canadian model) Rewind Time:
110V, 120V, 220V, 240V ac, 50/60 Hz
(UK, AEP model)
110W (US, Canadian model)
9OW (UK, AEP model)
300W, unswitched (US, Canadian mode!)
Recording Time:
Heads:
Approx. 445 (w) x 525 (h) x 235 (d) mm
1715 (w) x 205 (h) x 91/4 (d) inches
: ? Shans Motors:
including projecting parts and controls
26.5 kg, 58 lb 7 oz (US, Canadian model)
Reel:
27 kg, 58 lb 80z (UK, AEP model)
2-track 2-channel stereo recording and playback
4-track 2-channel stereo playback
38 cm/s (15 ips)
19 cm/s (7% ips)
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS
IDENTIFIED BY SHADING ON THE
SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE
CRITICAL TO SAFE OPERATION.
REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
Approx, 150 seconds with 740 m (2,400 ft) tape
With 1,100 m (3,600 ft), 27cm reel
Stereo recording
45 minutes at 38 cm/s
Mono recording
180 minutes at 19 cm/s
Record head 1, Playback head 2
Erase head 1
AC servo-controlled capstan motor 1
Induction reel motor 2
Up to 27cm (10%-inch)
— Continued on page 2 —
SONY.
SERVICE MANUAL

Summary

SPECIFICATIONS

SAFETY-RELATED COMPONENT WARNING!

Critical safety warning regarding specific components identified by shading.

SECTION 1 OUTLINE

1-1. BLOCK DIAGRAM System Control Section

System control block diagram illustrating operational flow.

1-2. BLOCK DIAGRAM Amplifier Section

Block diagram detailing the amplifier section circuits.

SECTION 2 DISASSEMBLY

NOTE ON REPAIRING

Important notes and guidelines for performing repairs.

SECTION 3 ADJUSTMENTS

3-1. MECHANICAL ADJUSTMENTS

Procedures for mechanical adjustments and calibrations.

3-3. ELECTRICAL ADJUSTMENTS

Procedures for electrical adjustments and calibrations.

B+ Voltage Adjustment

Tape Speed Adjustment

Playback Head Angle Adjustment

Playback Head Azimuth and Phase Adjustment

Playback Frequency Response Adjustment

Playback Level Adjustment

VU Meter Calibration

Record Head Angle Adjustment

Record Head Height and Zenith Adjustment

Record Head Azimuth and Phase Adjustments

Record Bias Adjustment

Record Level Adjustment

Record Equalizer Adjustment

Record Bias Trap Adjustment

Dummy Coil Adjustment

SECTION 6 ELECTRICAL PARTS LIST

REMOTE CONTROL

1. SPECIFICATIONS

Technical specifications for the RM-30 remote control.

4. CIRCUIT DESCRIPTION

REC MUTE Operation

5. SCHEMATIC DIAGRAM

7. ELECTRICAL PARTS LIST

1. Action of IC701 (CX738)

2. Action when switched from Fast Forward or Rewind to Forward

3. Power Supply Section

4. High Voltage Power Supply for Solenoid Initial-Energization

5. Reel Motor Starting Circuit

6. Tension Regulator Circuit

7. Tape Tension Set-up and Circuit Operation

8. Mechanical Tension Regulator

9. Reel Motor Drive Circuit

10. Back Tension Set-up in Rewind Mode

11. Back Tension Set-up in the Fast Forward Mode

12. STOP Circuit (Shut-Off Circuit)

13. TIMER-Activated Operation

14. Playback Muting

15. Record Muting

16. REC MONITOR MUTE Circuit

17. Power Supply for Record Bias Oscillator

18. Function Button Action Flow Chart

19. Circuit Operation

20. Function Button Action Time Chart

Sony TC-766-2 Specifications

General

Track System	4-track, 2-channel stereo
Heads	3 (erase, record, playback)
Reel Size	7-inch
Tape Speeds	3.75 and 7.5 ips
Frequency Response	30 Hz to 20 kHz
Signal-to-Noise Ratio	60dB
Inputs	Line In, Microphone In
Outputs	Line, Headphone