Sony ta a 790e

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TA-A'IQUE

SERVICE MANUAL

This set is the Preamplifier

section in LBT-A790/A795.

AEP Model

E Model
Australian Model
Tourist Model

Video input (phono jacks)

VIDEO 1 / MD, VIDEO 2/ DAT, VIDEO 3

Video output (phono jacks)

VIDEO 1/ MD
VIDEO 2/ DAT

MONITOR

Frequency response
Power requirements

1 Vp-p, 75 ohm unbalanced, sync
negative

1 Vp-p, 75 ohm unbalanced, sync
negative

1 Vp-p, 75 ohm unbalanced, sync
negative

1 Vp-p, 75 ohm unbalanced, sync
negative

15 Hz to 20 mag dB

220-230V AC, 50/60Hz

(AEP, G, IT, CIS)

240V AC, 50/60H2 (AUS)
1107120V/220~240V AC. 50/60Hz
(E, EA, MY, SP, JE}

120V AC, 60Hz (MX)

SPECIFICATIONS
. . . . i Power consumption 18W
Audio input Jack type Sensitmty Impedance Mass Approx. 3.9 kg (8 lbs 10 oz)
VIDEO 1 /MD Phone 435 mV 47 kohms Dm°5°5 AWE? 35555/x 1315:4332 mm
VIDEO l/DAT Phone 435 mV 47 kohms I x 16 x 1 es). .
VIDEO 3 Phone 245 mV .17 kohms (W/h/d' ddg Pmecmns)
PHONO (MM) Phone 3.3 mV 47 kohms
MIC Phone 1 mV 10 kohms Design and specifications are subject to change without notice.
Audio output Jack type Voltage Impedance
0 Abbreviations
VIDEO i/MD Phono 235 mV 2 kohms G ; German model
VIDEO Z/DAT Phone 235 mV 2 kohms 'T i 3 model
CENTER OUT Phono AUS: Australian model
EA : Saudi Arabia model

MY : Malaysia model
SP : Singapore model
JE : Tourist model
MX : Mexican model

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BV MARK A 0R DOTTED LINE WITH
MARK [A 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.

DIGITAL STEREO PREAMPLIFIER
S 0 NY;

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MODEL IDENTIFICATION
-Specification Label-

S ON Y
DIGITAL STEREO PREAMPLIFIER

WW

MODEL N0. TA-A790E

SERIAL NO.
MADE IN JAPAN

AEP, IT, CIS model: AC: 220V-230V~50/60HZ 18W

G model : SYSTEM LBT~A790

AC: 220V-230V~50/60HZ 18W
AUS model : AC: 240V~50l60Hz 18W
E, EA,

MY, SP. JE model

: AC: 1lOV-l20V/220V-240V~50/60Hz 18W

MX model : AC: 120V~60Hz 18W
0 Abbreviations

IT : Italian model

G : German model

AUS: Australian model

EA : Saudi Arabia model

MY : Malaysia model

SP : Singapore model

JE : Tourist model

MX : Mexican model

TABLE OF CONTENTS

Section Title Page
1. GENERAL

1-1. Location of Controls .............................. 3
2. SERVICE NOTE

2-1. Removal of Joint .................................. 3
3. DIAGRAMS

3-1. Pin Descriptions .................................. 4
3-2. Circuit Boards Location .......................... 8
3-3. Semiconductor Lead Layouts ...................... 9
3~4, Block Diagram .................................. 10
3-5. Printed Wiring Boards-Main Section~ ,,,,,,,,,, 13
3-6. Schematic Diagram -Main Section~ ............ 17
3-7 Schematic Diagram -Panel Section~ ............ 22
3-8. Printed Wiring Boards~Panel Section- .......... 27
4. EXPLODED VIEWS

4-1, Front Panel Section .............................. 33
4-2. Chassis Section .................................. 34
5. ELECTRICAL PARTS LIST ...................... 35