Sony TCM-939 Service Manual

TCM-929/939
TCM-929
Canadian Model
AEP Model
UK Model
E Model
Australian Model
TCM-939
Photo: TCM-939
TCM-919
MT-929
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
Recording system
2-track 1 channel monaural
Frequency range
150 - 8,000 Hz
Speaker
Approx. 6.6 cm (2% in.) dia.
Power output
400 mW (at 10 % harmonic distortion)
Input
Microphone input jack (minijack) sensitivity 0.775 mV for low
impedance microphone
Output
Earphone jack (minijack) for 8 - 300 ohms earphone
Power requirements
¢ Four size AA (R6) batteries (not supplied): 6V DC
¢DC IN 6 V jack accepts:
Supplied AC power adaptor suitable in the country where the unit
is to be used.
Dimensions (w/h/d) (incl. projecting parts and controls)
Approx. 144 x 60 x 237 mm
5%A~x2%x9I ¥%in.)
Mass (not incl. batteries)
Approx. 675 g (23.9 oz.)
Supplied accessories
AC power adaptor (1)
(US, Canadian and European model only)
Design and specifications are subject to change without notice.
CASSETTE CORDER
SONY.

Sony TCM-939 Specifications

General

Battery type	AM-3 (LR 06)
Battery life (max)	9 h
Number of batteries supported	4
Product color	Black
Reverse	No

Weight and Dimensions

Weight	745 g
Dimensions (WxDxH)	144 x 237 x 60 mm

Summary

Specifications

Section 1: General Operations

Recording Procedures

Instructions for recording using the built-in or external microphone.

Playing a Tape

Steps for playing a cassette tape and adjusting volume.

Section 2: Disassembly Procedures

Rear Cabinet Disassembly

Procedure for disassembling the rear cabinet of the unit.

Main Board Access

Steps to access and disconnect the main circuit board.

Mechanism Deck Disassembly

Detailed steps for disassembling the mechanism deck.

Cassette Lid Disassembly

Instructions for removing and disassembling the cassette lid.

Section 3: Adjustments and Calibration

Mechanical Adjustments

Procedures and precautions for mechanical adjustments.

Electrical Adjustments

Steps for electrical adjustments like tape speed and azimuth.

Section 4: Technical Diagrams

Printed Wiring Board Diagram

Diagram showing the layout of the printed wiring board.

Schematic Diagram

Detailed schematic circuit diagram of the main board.

Section 5: Exploded Parts Views

Cabinet Section Exploded View

Exploded view of the cabinet and its components.

Mechanism Deck Exploded View

Exploded view of the mechanism deck and its parts.

Section 6: Electrical Parts List

Accessories and Packing Materials

Hardware List