1
SERVICE MANUAL
BE-3ECHASSIS
MODEL
COMMANDER
DEST
CHASSIS NO.
KV-28DC20B
RM-931
FR
SCC-Q23D-A
MODEL
COMMANDER
DEST
CHASSIS NO.
RM-931
PROGR
TV/SAT
R
SORTIE
PREFER -/--
SOIREE
DIM
JOURNEE
NUIT
SAM
VEN
JEU
LUN
MAR
MER
PILOTE
PROGR
SERV
PERSO
AB
C
E
D
MENU
TV
2
TABLE OF CONTENTS
Section
Title
Page
Section
Title
Page
Specifications
....................
3
Connectors
....................
4
Self Diagnostic Software
....................
5
1. GENERAL
Automatically Tuning the TV
....................
9
Adjusting the Picture & Sound ....................
10
Using the Further Programme
Preset Feature
....................
11
Manually Tuning the TV
....................
12
Teletext
....................
13
Specifications
....................
15
Troubleshooting
....................
15
2. DISASSEMBLY
2-1.
Rear Cover Removal
....................
16
2-2.
Chassis Assy Removal
....................
16
2-3-1. Service Position(1)
....................
16
2-3-2. Service Position(2)
....................
16
2-4.
Wire Dressing
....................
17
2-5.
A Board Removal
....................
17
2-6.
A Extension Board
....................
17
2-7.
Picture Tube Removal
....................
18
Removal and Replacement of
the Main-Bracket Bottom Plates....................
19
3. SET-UP ADJUSTMENTS
3-1.
Beam Landing
....................
20
3-2.
Convergence
....................
21
3-3.
Screen (G2)
....................
23
3-4.
Focus
....................
23
3-5.
White Balance
....................
23
4. CIRCUIT ADJUSTMENTS
4-1.
Electrical Adjustments
....................
24
4-2.
`TT' Test Mode
....................
27
4-3.
`T' Test Mode
....................
28
5. DIAGRAMS
5-1.
Block Diagram (1)
....................
29
Block Diagram (2)
....................
33
Block Diagram (3)
....................
37
Block Diagram (4)
....................
41
5-2.
Circuit Board Location
....................
44
5-3.
Schematic Diagrams and
Printed Wiring Boards
....................
44
* C Board
....................
45
* D Board
....................
49
* VM Board
....................
52
* H Board
....................
53
* D2 Board
....................
55
* J4 Board
....................
56
* N Board
....................
59
* J3 Board
....................
74
* J5 Board
....................
76
* D1 Board
....................
77
* A Board
....................
83
* A2 Board
....................
89
5-4.
Semiconductors
....................
95
5-5.
IC Blocks
....................
97
6. EXPLODED VIEWS
6-1.
Chassis
....................
99
6-2.
Picture Tube
....................
100
7. ELECTRICAL PARTS LIST
....................
101
CAUTION
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE
ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR THE
CARBON PAINTED ON THE CRT, AFTER REMOVAL OF THE
ANODE CAP.
WARNING !!
AN ISOLATION TRANSFORMER SHOULD BE USED DURING ANY
SERVICE WORK TO AVOID POSSIBLE SHOCK HAZARD DUE TO
LIVE CHASSIS, THE CHASSIS OF THIS RECEIVER IS DIRECTLY
CONNECTED TO THE POWER LINE.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY SHADING AND MARKED
£ ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE
PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION
APRES AVOIR DECONNECTE LE CAP DE'LANODE,
COURT-CIRCUITER L'ANODE DU TUBE CATHODIQUE ET CELUI
DE L'ANODE DU CAP AU CHASSIS METALLIQUE DE L'APPAREIL,
OU AU COUCHE DE CARBONE PEINTE SUR LE TUBE
CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.
ATTENTION !!
AFIN D'EVITER TOUT RISQUE D'ELECTROCUTION PROVENANT
D'UN CHÁSSIS SOUS TENTION, UN TRANSFORMATEUR
D'ISOLEMENT DOIT ETRE UTILISÈ LORS DE TOUT DÈPANNAGE
LE CHÁSSIS DE CE RÈCEPTEUR EST DIRECTMENT RACCORDÈ
Á L'ALIMENTATION SECTEUR.
ATTENTION AUX COMPOSANTS RELATIFS Á
LA SECURITÈ!!
LES COMPOSANTS IDENTIFIÈS PAR UNE TRAME ET PAR UNE
MARQUE
£ SUR LES SCHÈMAS DE PRINCIPE, LES VUES
EXPLOSÈES ET LES LISTES DE PIECES SONT D'UNE IMPOR-
TANCE CRITIQUE POUR LA SÈCURITÈ DU FONCTIONNEMENT,
NE LES REMPLACER QUE PAR DES COMPSANTS SONY DONT LE
NUMÈRO DE PIÈCE EST INDIQUÈ DANS LE PRÈSENT MANUEL
OU DANS DES SUPPLÈMENTS PUBLIÈS PAR SONY.
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Connected
Not Connected (open)
* at 20Hz - 20kHz
Pin No
1
2
4
Signal
Signal level
1
Audio output B
(right)
Standard level : 0.5V rms
Output impedence : Less than 1kohm*
2
Audio output B
(right)
Standard level : 0.5V rms
Output impedence : More than 10kohm*
3
Audio output A
(left)
Standard level : 0.5V rms
Output impedence : Less than 1kohm*
4
Ground (audio)
5
Ground (blue)
6
Audio input A
(left)
Standard level : 0.5V rms
Output impedence : More than 10kohm*
7
Blue input
0.7 +/- 3dB, 75 ohms positive
8
Function select
(AV control)
High state (9.5-12V) : Part mode
Low state (0-2V) : TV mode
Input impedence : More than 10K ohms
Input capacitance : Less than 2nF
9
Ground (green)
10
Open
11
Green
Green signal : 0.7 +/- 3dB, 75 ohms,
positive
12
Open
13
Ground (red)
14
Ground (blanking)
15
_
_
Red input
0.7 +/- 3dB, 75 ohms, positive
_
(S signal Chroma
input)
0.3 +/- 3dB, 75 ohms, positive
16
Blanking input
(Ys signal)
High state (1-3V) Low state (0-0.4V)
Input impedence : 75 ohms
17
Ground (video
output)
18
Ground (video
input)
19
Video output
1V +/- 3dB, 75ohms, positive sync 0.3V
(-3+10dB)
20
_
_
Video input
1V +/- 3dB, 75ohms, positive sync 0.3V
(-3+10dB)
_
Video input
Y (S signal)
1V +/- 3dB, 75ohms, positive sync 0.3V
(-3+10dB)
21
Common ground
(plug, shield)
21 pin connector
19
17
15
13
11
9
7
5
3
1
20
18
16
14
12
10
8
6
4
2
21
Rear Connection Panel
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S-Video
socket
5
BE-3E SELF DIAGNOSTIC SOFTWARE
The errors indicated below can be read using an Error Reader Display (Part Number S-188-900-10) connected to the service connector. Once an
error has been detected it will then be displayed on the two digit error reader. During the power up procedure and during normal run time, the micro's
self diagnostic procedures monitor for various errors. Errors displayed refer to the table indicated below.
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