Sony TC-RX77 User Manual

TC-RX77/RX7TTES
SERVICE MANUAL
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol 00) are trademarks of
Dolby Laboratories Licensing Corporation.
4-track 2-channel stereo
Approx. 90 sec. (with Sony C-60
Recording system
Fast-winding time
cassette)
Bias AC bias
Heads Erasing head x 1 (ferrite head)
Playback/Recording 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)
Type IV (Sony METAL-SLT) | 59dB | 67 4B
Type Il (Sony UX-S) 58dB | 66dB
Total harmonic distortion
1% (with Sony METAL-SLT cassette)
Frequency response (DOLBY NR OFF)
20- 20,000Hz (+ 3db,/EC)
(US, Canadian models)
25-19,000Hz (+ 3db,JEC) (AEP)
Type Il cassette 25 - 17,000 Hz (+3 dB, IEC)
(Sony UX-S)
Type | cassette 25 - 16,000 Hz (+3 dB, IEC)
(Sony HF-S)
Wow and flutter +0.09% W. Peak (IEC)
0.06% WRMS (NAB).
+0.16% W. Peak (DIN)
Type IV cassette
(Sony METAL-SLT)
Dolby NR switch OFF B-Type | C-Type
ON ON |
— US Model
Canadian Model
TC-RX77TES
AEP Model
TC-RX77
Model Name Using Similar Mechanism TC-RX70/RX70ES
Tape Transport Mechanism Type TCM - 200R6
hg s
Inputs
(phone
Outputs
Line outputs
(phono jacks)
Headphones
(stereo phone
jack)
Line inputs
(phono jacks)
Microphone inputs
77.5 mV
Input impedance | 47 k ohms
Sensitivity (For a | 0.25 mV
low-impedance |
microphone)
jacks)
Rated output level] 0.32 V ata load
impedance of 47
k ohms
Load impedance | Over 10 k ohms
Output level 0-1.25 mW ata
load impedance of
32 ohms
General
Power requirements
RX77ES : 120 V AC, 60Hz (US, Canadian models)
RX77 =: 220V AC, 50/60Hz (AEP model)
Power consumption 20W
Dimensions Approx. 430 x 123 x 300 mm (w/h/d)
(17 x 4% x 117% inches)
including projecting parts and controls
Weight Approx. 4.7 kg (10 Ibs 6 02)
Supplied accessory
Audio connecting cords (2)
Design and specifications subject to change without notice.
STEREO CASSETTE DECK
SONY.

Sony TC-RX77 Specifications

General

Track System	4-track, 2-channel stereo
Motor	DC Servo Motor
Tape Speed	4.8 cm/s
Type	Cassette Deck
Inputs	Line
Output	Line
Frequency Response	20 Hz to 20 kHz

Summary

Section 1 General

Identification of Front Panel Parts

Overview of front panel controls and indicators.

Identification of Rear Panel Parts

Overview of rear panel connections and ports.

Features

Key operational features and benefits of the cassette deck.

Section 2 Disassembly

Section 3 Adjustments

Mechanical Adjustments

Procedures for cleaning and adjusting mechanical parts.

Electrical Adjustments

Procedures for electrical calibration and tuning.

Record/Playback Head Azimuth Adjustment

Aligning the head for optimal signal playback.

Bias Current Adjustment

Setting the bias current for recording.

Section 4 Diagrams

Semiconductor Lead Layouts

Diagrams showing pin configurations of semiconductors.

Circuit Boards Location

Visual guide to the location of circuit boards.

Printed Wiring Boards

Layouts of the printed circuit boards.

Schematic Diagram

Complete circuit schematic for the device.

Section 5 Exploded Views

Front Panel Section

Exploded view of the front panel assembly and parts.

Chassis Section

Exploded view of the chassis and related components.

Mechanism Section (TCM-200R6)

Exploded view of the tape transport mechanism.

Mechanism Section (TCM-200R6) Part 2

Second part of the tape transport mechanism exploded view.

Section 5 Electrical Parts List