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– 5 –

These servicing instructions are for use by qualified service per-
sonnel only.
To reduce the risk of electric shock, do not perform any servicing
other than that contained in the operating instructions unless you
are qualified to do so.

(CAUTION)

SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE
ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR CAR-
BON PAINTED ON THE CRT, AFTER REMOVING THE ANODE.

WARNING!!

AN ISOLATION TRANSFORMER SHOULD BE USED DURING
ANY SERVICE TO AVOID POSSIBLE SHOCK HAZARD, BE-
CAUSE OF LIVE CHASSIS.
THE CHASSIS OF THIS RECElVER IS DIRECTLY CONNECTED
TO THE AC POWER LINE.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK 

! ON THE

SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART NUM-
BERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE-
MENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT
ARE CRITICAL TO SAFE OPERATION ARE IDENTIFIED IN THIS
MANUAL. FOLLOW THESE PROCEDURES WHENEVER CRITI-
CAL COMPONENTS ARE REPLACED OR IMPROPER OPERA-
TION IS SUSPECTED.

(ATTENTION)

APRES AVOIR DECONNECTE LE CAP DE L’ANODE, COURTCIR-
CUITER 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 CATHOD-
IQUE OU AU BLINDAGE DU TUBE CATHODIQUE.

ATTENTION!!

AFIN D’EVITER TOUT RISQUE DELECTROCUTION PROVE-
NANT D’UN CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR
D’ISOLEMENT DOIT ETRE UTILISÉ LORS DE TOUT DEPAN-
NAGE.
LE CHÁSSIS DE CE RECEPTEUR EST DIRECTEMENT RAC-
CORDÉ Á L’ALIMENTATION SECTEUR.

ATTENTION AUX COMPOSANTS RELATIFS ÁLA

SÉCURITÉ!!

LES COMPOSANTS IDENTIFIÉS PAR UNE FRAME ET PAR UNE
MAPQUE 

! SUR LES SCHÉMAS DE PRINCIPE, LES VUES EX-

PLOSÉES ET LES LISTES DE PIECES SONT D’UNE IMPORTANCE
CRITIQUE POUR LA SÉCURITÉ DU FONCTIONNEMENT. NE LES
REMPLACER QUE PAR DES COMPOSANTS SONY DONT LE
NUMÉRO DE PIÉCE EST INDIQUÉ DANS LE PRÉSENT MAN-
UEL OU DANS DES SUPPLÉMENTS PUBLIÉS PAR SONY. LES
RÉGLAGES DE CIRCUIT DONT L’IMPORTANCE EST CRITIQUE
POUR LA SÉCURITÉ DU FONCTIONNEMENT SONT IDENTIFIES
DANS LE PRÉSENT MANUEL. SUIVRE CES PROCÉDURES
LORS DE CHAQUE REMPLACEMENT DE COMPOSANTS CRI-
TIQUES, OU LORSQU’UN MAUVAIS FONCTIONNEMENT SUS-
PECTÉ.

– 6 –

Section

Title

Page

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Section

Title

Page

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.....................

8

2-1.

Rear Cover Assembly .......................................

11

2-2.

OU Bracket Removal ........................................

11

2-3.

Service Position .................................................

11

2-4.

Power Block Removal ........................................

11

2-5.

Optical Unit Block Assembly Removal ............

12

2-6.

UD Board, Terminal Board

Assembly Removal ............................................

12

2-7.

U, M, BB, BC Boards Removal .........................

13

2-8.

G Board Removal ...............................................

13

2-9.

A Board Removal ...............................................

14

2-10. T Board Removal ...............................................

14

2-11. Control Panel Block Assembly Removal ..........

14

2-12. H3 Board Removal .............................................

14

2-13. H2 Board Removal .............................................

15

2-14. Screen Mirror Block Assembly Removal ..........

15

2-15. H1 Board Removal .............................................

15

3-1.

Electrical Adjustment by Remote Commander ....

16

3-1-1. Method of Setting the Service Adjustment

Mode ...............................................................

16

3-1-2. Service Mode Adjustment ............................

16

3-1-3. Memory Write Confirmation Method ..........

16

3-1-4. Adjusting Buttons and Indicator ...................

17

3-1-5. Service Mode List ..........................................

18

3-2.

Chassis Picture Quality Adjustment .................

65

3-2-1. White Level Adjustment ...............................

65

3-2-2. Sub Color/Sub Hue Adjustment ....................

66

3-2-3. Hi-Level/Cut-Off Adjustment .......................

68

3-3.

Vertical Stripe Adjustment ...............................

68

3-4.

Sub Bright Adjustment .......................................

69

3-5.

Screen Center Adjustment .................................

69

3-6.

Favorites Adjustment .........................................

69

4-1.

Block Diagram (1) ..............................................

70

Block Diagram (2) ..............................................

71

Block Diagram (3) ..............................................

72

Block Diagram (4) ..............................................

73

Block Diagram (5) ..............................................

74

Block Diagram (6) ..............................................

75

Block Diagram (7) ..............................................

76

Block Diagram (8) ..............................................

77

Block Diagram (9) ..............................................

78

Block Diagram (10) ............................................

79

4-2.

Frame Schematic Diagram .................................

80

4-3.

Circuit Boards Location .....................................

81

4-4.

Schematic Diagrams and Printed Wiring

Boards .................................................................

81

(1)

Schematic Diagram of A (1/4) Board ................

82

(2)

Schematic Diagram of A (2/4) Board ...............

83

(3)

Schematic Diagram of A (3/4) Board ...............

84

(4)

Schematic Diagram of A (4/4) Board ...............

85

(5)

Schematic Diagram of BB (1/10) Board ...........

86

(6)

Schematic Diagram of BB (2/10) Board ...........

87

(7)

Schematic Diagram of BB (3/10) Board ...........

88

(8)

Schematic Diagram of BB (4/10) Board ...........

89

(9)

Schematic Diagram of BB (5/10) Board ...........

90

(10) Schematic Diagram of BB (6/10) Board ...........

91

(11) Schematic Diagram of BB (7/10) Board ...........

92

(12) Schematic Diagram of BB (8/10) Board ...........

93

(13) Schematic Diagram of BB (9/10) Board ...........

94

(14) Schematic Diagram of BB (10/10) Board .........

95

(15) Schematic Diagram of BC (1/5) Board .............

96

(16) Schematic Diagram of BC (2/5) Board .............

97

(17) Schematic Diagram of BC (3/5) Board .............

98

(18) Schematic Diagram of BC (4/5) Board .............

99

(19) Schematic Diagram of BC (5/5) Board ............. 100

(20) Schematic Diagram of BF Board ....................... 101

(21) Schematic Diagram of BM-1C (1/3) Board ...... 102

(22) Schematic Diagram of BM-1C (2/3) Board ...... 103

(23) Schematic Diagram of BM-1C (3/3) Board ...... 104

(24) Schematic Diagram of G Board ......................... 105

(25) Schematic Diagrams of H1, H2, H3 and

T Boards ............................................................. 106

– 7 –

(26) Schematic Diagram of M (1/4) Board ............... 107

(27) Schematic Diagram of M (2/4) Board ............... 108

(28) Schematic Diagram of M (3/4) Board ............... 109

(29) Schematic Diagram of M (4/4) Board ............... 110

(30) Schematic Diagram of U (1/3) Board ................ 111

(31) Schematic Diagram of U (2/3) Board ................ 112

(32) Schematic Diagram of U (3/3) Board ................ 113

(33) Schematic Diagram of UD (1/2) Board ............. 114

(34) Schematic Diagram of UD (2/2) Board ............. 115

Printed Wiring Boards

• A Board ............................................................ 116

• BB Board .......................................................... 118

• BC Board .......................................................... 120

• BM-1C Board ................................................... 120

• G Board ............................................................ 122

• H1 and T Boards .............................................. 124

• H2 Board .......................................................... 125

• H3 Board .......................................................... 126

• M Board ........................................................... 127

• U Board ............................................................ 128

• UD Board ......................................................... 130

4-5

Waveforms ......................................................... 131

4-6

IC Block Diagrams ............................................. 132

4-7

Semiconductors .................................................. 134

5-1.

Screen Mirror Block Section ............................ 136

5-2.

Cabinet Section ................................................... 137

5-3.

Main Section ....................................................... 138

5-4.

Optical Unit Section ........................................... 139

............................ 140

Section

Title

Page

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– 8 –

• This device includes a self-diagnosis function.

• In case of abnormalities, the STANDBY indicator automatically blinks.  It is possible to predict the abnormality location by the number

of blinks.  The Instruction Manual describes blinking of the STANDBY indicator.

• If the symptom is not reproduced sometimes in case of a malfunction, there is recording of whether a malfunction was generated or not.

Operate the remote command to confirm the matter on the screen and to predict the location of the abnormality.

• When a malfunction occurs the STANDBY indicator only blinks for one of the following diagnosis items.  In case of two or more

malfunctions, the item which first occurred blinks.  If the malfunctions occurred simultaneously, the item with the lower blink count

blinks first.

• The screen display displays the results regarding all the diagnosis items listed below.  The display “ 0 ” means that no malfunctions

occurred.

  

 

     

     

              

         !

"       

! 

"# $% "  '%

  ()

 

 

* 

¥ Power cord is not plugged in.

¥ Fuse is burned out (F1601) (G board)

¥ Power does not come on.

¥ No power is supplied to the unit.

¥ AC power supplyis faulty.

Power does not turn on

¥ Lamp cover is not attached securely.

¥ No picture/No sound

Lamp cover error

¥ FAN1 or FAN2 power is not supplied. (A board)

¥ FAN connector is not attached securely.

¥ No picture/No sound

FAN stopped

Lamp driver error

¥ Lamp driver is faulty.

¥ No picture/No sound

¥ +5 V is not supplied. (G board)

¥ No picture/No sound

Low B error

¥ Audio ±15 V line is shorted. (A, G board)

¥ IC1203 or IC1204 is faulty. (A board)

¥ PS1601 or 1602 is opened. (G board)

Audio error

¥ No picture/No sound

Lamp error

¥ Lamp for the light souce burns out.

¥ No picture/No sound

0

3 times

4 times

5 times

6 times

9 times

LAMP LED

flashes