Sony LBT-A790 User manual

LBT-A790/A7995
SERVICE
MANUAL
AEP
Model
LBT-A790
E Model
LBT-A790/A795
Australian Model
LBT-A795
Tourist Model
LBT-A790
+ LBT-A790/A795 are composed of following models.
As for the service manual, it is issued for each component model,
then, please refer to it.
COMPONENT MODEL NAME FOR THESE SYSTEM
LBT-A790 LBT-A795
aeP| it | @ [cis] € | ea] sP | my JE E [mx [aus
POWER-AMPLIFIER TA-A790N
PRE-AMPLIFIER TA-A790E
CASSETTE DECK TC-A790
TUNER ST-A790
CD PLAYER CDP-M46 CDP-C433M
SPEAKER SYSTEM $S-D790AN
AUS : Australian IT: Italian
MX =: Mexican BA : Saudi Arabia
G : German MY : Malaysia
SP: Singapore JE : Tourist
STEREO COMPONENT SYSTEM
ONY.
English
94D0570-1
Sony Corporation Printed in Japan
Comsumer A&V Products Company © 1994.4
9-959-479-11 Home A&V Products Div. Published by Home A&V Products Div.
Quality Engineering Dept.

NOTE:
@ Items marked "*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
Ref.No. Part No. Description Remark
@ Abbreviations
AUS: Australian
1-467-614-11 REMOTE COMMANDER (RM-S721)
1-501-374-11 ANTENNA, LOOP
1-501-594-11 ANTENNA (FM) (AEP, IT, CIS)
1-501-659-11 ANTENNA (FM) (EA, E, MY, SP, JE, MX, AUS)
1-551-734-11 CORD, CONNECTION (PIN-PIN)
(EA, E, MY, SP, JE, MX, AUS)
1-590-823-11 CORD (WITH CONNECTOR) (3P-11P-11P)
1-690-727-11 CORD (SPEAKER) (E, EA, MY, SP, JE, AUS, MX)
1-751-179-11 CORD (WITH CONNECTOR) (3P-15P-15P)
1-751-180-11 CORD (WITH CONNECTOR) (11P-11P)
1-765-462-11 CORD (WITH CONNECTOR) (3P-3P-3P-3P)
+ 3-350-154-01 CUSHION (TC)
3-758-344-11 MANUAL, INSTRUCTION (FOR CDP-C433M)
(ENGLISH, FRENCH, SPANISH, CHINESE)
(A795:E, AUS, MX)
3-758-394-41 MANUAL, INSTRUCTION
(ENGLISH, FRENCH, SPANISH, PORTUGUESE) (AEP)
3-758-394-51 MANUAL, INSTRUCTION
(GERMAN, DUTCH, SWEDISH, ITALIAN) (AEP, 6, 17)
3-758-394-61 MANUAL, INSTRUCTION
(ENGLISH, GERMAN, RUSSTAN, POLISH) (CIS)
3-758-394-71 MANUAL, INSTRUCTION
(CZECH, HUNGARIAN) (CIS)
3-758-394-81 MANUAL, INSTRUCTION (ENGLISH, FRENCH,
SPANISH, CHINESE) (EA, E, MY, SP, JE, AUS, MX)
* 4-927-355-01 CUSHION (ST:MADE IN FRENCH)
+ 4-929-563-01 CUSHION (CDP-M46) (ST:MADE IN JAPAN)
* 4-944-040-01 CUSHION (FRONT) (CDP-C433M) .
* 4-944-041-01 CUSHION (REAR) (CDP-C433M)
4-955-663-51 INDIVIDUAL CARTON (ST)
4-956-911-01 LID, SLIDE (FOR RM-S721)
. 4-965-030-01 INDIVIDUAL CARTON (TA-ST-TC) (A790: AEP, CIS)
* 4-965-031-01 INDIVIDUAL CARTON
(TA-ST-TC-CDP) (A790:E, EA, MY)
* 4-965-032-01 INDIVIDUAL CARTON (TA-ST-TC-CDP) (A790:SP)
* 4-965-033-01 INDIVIDUAL CARTON (TA-ST-TC-CDP) (A790: JE)
‘ 4-965-034-01 INDIVIDUAL CARTON (TA-TC) (A790: AEP, G, IT)
* 4-965-036-01 INDIVIDUAL CARTON (TA-ST-TC-CDP) (A795:E)
‘ 4-965-037-01 INDIVIDUAL CARTON (TA-ST-TC-CDP) (A795: AUS)
MX : Mexican
G : German MY : Malaysia
SP : Singpore JE : Tourist
Ref.No. Part. No. Description Remark
* 4-965-421-01 CUSHION (TA)
* 4-967-148-01 INDIVIDUAL CARTON (TA-ST-TC-CDP) (A795:¥X)
. 4-967-903-01 INDIVIDUAL CARTON (SS) (A790: JE)

MODEL
IDENTIFICATION
TABLE
OF
CONTENTS
—Specitication
Label—
Section Title Page
SOTIME
piMCmeL
NOTA
AZO
1.
GENERAL
DIGITAL
STEREO
PREAMPLIFIER
1-1.
Location
of
Controls
.............
aa)
LZ
ZL
2. SERVICE NOTE
2-1. Removal of Joint ..... teeeeeaes ae wok ere
SERIAL NO.
MADE IN JAPAN | 3. DIAGRAMS
3-1, Pin Descriptions .
3-2. Circuit Boards Location ae F
3:3, Semiconductor Lead Layouts .. nee ceeen
AEP, IT, CIS model: AC: 220V—230V~50/60Hz 18W
G model : SYSTEM LBT-A790 i
AC: 220V-—-230V~50/60Hz 18W 3-4. Block Diagram ..... pete sre auN 10
AUS
model
:
AC:
240V~50/60Hz
18W
3-5.
Printed
Wiring
Boards—Main
Section—
Peer:
EEA, 3-6. Schematic Diagram —Main Section— .......... 17
MY,
SP,
JE
model
:
AC:
110V—120V/220V—240V~50/60Hz
18W
3:7.
Sch
ic
Di
—Panel
Section—
22
MX modo! : AG: 120V~60H2z 18W -7. Schematic Diagram anel Section— ...........
3-8. Printed Wiring Boards—Panel Section— . 27
® Abbreviations
IT: Italian model 4. EXPLODED VIEWS
Gs:
German
model
.
‘AUS: Australben rede 4-1. Front Panel Section ......... eee uhs ieatbeenee gS:
EA ; Saudi Arabia model 4-2, Chassis Section ......-.. Gea stars fans 34
MY : Malaysia model
SP : Sit
Sees eee 5. ELECTRICAL PARTS LIST ............0..0004 135
JE: Tourist model
MX : Mexican model

SECTION 1
GENERAL
This section is extracted from
1-1.
LOCATION
OF
CONTROLS
instruction
manual.
SOURCE DIRECT button and indicator
(96, 110)
POWER switch (20)
Numeric buttons (96, 100, 114, 116, 118)
Display window
MEMORY button (114, 118)
ENTER button and indicator (96, 106,
108, 118)
MODE button and indicator (96, 106,
108, 118)
= CURSOR CONTROL buttons (96, 106,
®@@ 108, 118)
|
---
z=
CANCEL
button
(106,
108)
VOLUME control (24)
BALANCE control (24, 98)
VIDEO 3 INPUT jacks (146)
DBS LEVEL and DBS FREQUENCY
buttons (24)
DISPLAY button (112)
Function selectors and indicators (42)
P. FUNCTION button and indicator
(144)
MIC LEVEL control (142)
HEADPHONES jack (22)
DSP MENU button and indicator (96,
100, 116)
&
IN|
2}
5S
je
=
12]
12)
IS)
i
we
fe
=
ala
Sy
a
lSI=lSIo)
fel
fig [13]
]
f
(slele)
SECTION 2
SERVICE NOTE
Note : Follow the disassembly procedure in the numerical order given.
2-1. REMOVAL OF JOINT
@ Press the joint for front panel and
remove if from POWER switch,
\
\ @ Remove the joint in the
| direction of arrow.
POWER switch ($701)
@ Push the button (POWER) and
POWER switch to turn ON.