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– 9 –

( US model only )

After correcting the original service problem, perfom the follow-

ing safety checks before releasing the set to the customer:

l.

Check the area of your repair for unsoldered or poorly-sol-
dered connections. Check the entire board surface for solder
splashes and bridges.

2. Check the interboard wiring to ensure that no wires are

“pinched” or contact high-wattage resistors.

3. Check that all control knobs, shields, covers, ground straps,

and mounting hardware have been replaced. Be absolutely
certain that you have replaced all the insulators.

4. Look for unauthorized replacement parts, particularly tran-

sistors, that were installed during a previous repair. Point them
out to the customer and recommend their replacement.

5. Look for parts which, through functioning, show obvious

signs of deterioration. Point them out to the customer and
recom mend their replacement.

6. Check the line cords for cracks and abrasion. Recommend

the replacement of any such line cord to the customer.

7. Check the condition of the monopole antenna (if any). Make

sure the end is not broken off, and has the plastic cap on it.
Point out the danger of impalement on a broken antenna to
the customer, and recommend the antenna’s replacement.

8. Check the B+ and HV to see they are at the values specified.

Make sure your instruments are accurate;be suspicious of
your HV meter if sets always have low HV.

9. Check the antenna temminals, metal trim, “metallized” knobs,

screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

The AC leakage from any exposed metal part to earth ground and

from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5mA (500 microampers) . Leak-
age current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or

RCA WT-540A. Follow the manufacturers’ instructions to
usc these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are
examples of a passive VOM that is suitable. NearIy all bat-
tery operated digital multimeters that have a 2V AC range
are suitable. (See Fig. A)

A cold-water pipe is guaranteed earth ground;the cover-plate re-

taining screw on most AC outlet boxes is also at earth ground. If
the retaining screw is to be used as your earth-ground, verify that it
is at ground by measuring the resistance between it and a cold-
water pipe with an ohmmeter. The reading should be zero ohms. If
a cold-water pipe is not accessible, connect a 60-l00 watts trouble
light (not a neon lamp) between the hot side of the receptacle and
the retaining screw. Try both slots, if necessary, to locate the hot
side of the line, the lamp should light at normal brilliance if the
screw is at ground potential. (See Fig. B)

Ω

µ

– 10 –

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.

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!!

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.

– 11 –

Section

Title

Page

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––––

––––

Section

Title

Page

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––––

––––

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

13

2-1.

Rear Cover ..........................................................

16

2-2.

Terminal Bracket, D.C Fan ................................

17

2-3.

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

17

2-4.

Pod Block Assembly, Antenna Switch ..............

18

2-5.

Digital Block Assembly .....................................

18

2-6.

DC Motor SFF21C/C-NP ...................................

19

2-7.

Power Supply Block ...........................................

19

2-8.

Unit Cover Assembly, Lamp (R) Guide

Assembly ............................................................

20

2-9.

DC Motor SFF22A/C-NP ..................................

20

2-10. Optical Block Assembly ....................................

21

2-11. Screen Frame Block Assembly ..........................

21

2-12. Mirror Cover Block Assembly ...........................

22

2-13. H1 Block Assembly ...........................................

22

3-1.

Electrical Adjustment by Remote Commander ....

23

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

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

23

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

23

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

23

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

24

3-2.

To read Lamp and Panel time ............................

24

3-3.

Test Reset ...........................................................

24

3-4.

H/V Center Confirmation and Adjustment ........

25

4-1.

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

26

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

27

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

28

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

29

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

30

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

31

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

32

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

33

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

34

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

35

Block Diagram (11) ............................................

36

Block Diagram (12) ............................................

37

4-2.

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

38

4-3.

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

40

4-4.

Schematic Diagrams ...........................................

40

(1)

Schematic Diagram of AK Board ......................

41

(2)

Schematic Diagram of F Board .........................

42

(3)

Schematic Diagram of G (1/3) Board ...............

43

(4)

Schematic Diagram of G (2/3) Board ...............

44

(5)

Schematic Diagram of G (3/3) Board ...............

45

(6)

Schematic Diagram of HM Board .....................

46

(7)

Schematic Diagram of H1 Board ......................

47

(8)

Schematic Diagram of H2 Board ......................

48

(9)

Schematic Diagram of H3 Board ......................

49

(10) Schematic Diagram of K Board ........................

50

(11) Schematic Diagram of QU Board .....................

51

(12) Schematic Diagram of S1, S2 Boards ................

52

(13) Schematic Diagram of T1, T3 Boards ...............

53

4-5.

Printed Wiring Boards ........................................

54

(1)

AK Board ............................................................

54

(2)

F Board ...............................................................

55

(3)

G Board (Side A) ................................................

56

(4)

G Board (Side B) ................................................

57

(5)

HM, H1 Boards ..................................................

58

(6)

H2, H3 Boards ....................................................

59

(7)

K Board ...............................................................

60

(8)

QU, S1, S2, T1, T3 Boards ................................

61

4-6.

Semiconductors ..................................................

62

– 12 –

Section

Title

Page

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––––

––––

5-1.

Screen, Covers ....................................................

63

5-2.

Bottomblock-1 ....................................................

64

5-3.

Bottomblock-2 ....................................................

65

5-4.

Bottomblock-3 ....................................................

66

• AK Board ..................................................................

67

• F Board ......................................................................

68

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

68

• HM Board .................................................................

72

• H1 Board ...................................................................

73

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

73

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

73

• K Board .....................................................................

74

• QU Board ..................................................................

76

• S1 Board ....................................................................

76

• T1 Board ...................................................................

76

• T3 Board ...................................................................

77