Sony STR-DB795 Service Manual ▷ View online
STR-DB795
22
22
STR-DB795
6-6. BLOCK DIAGRAM – POWER SUPPLY Section –
+5V
REGULATOR
Q824
+5V
+10V
REGULATOR
IC1902
TUNER +10V
+3.3V
REGULATOR
IC1905
TUNER +3.3V
+5V
REGULATOR
IC1403
A+5V
+5V
REGULATOR
IC952
V+5V
+3.3V
REGULATOR
IC1903
+3.3V/+2.5V
REGULATOR
IC1901
+3.3V
D+3.3V
+3.3V
REGULATOR
IC1904
RECT
D54 – 57
D52
D53
T2
SUB POWER
TRANSFORMER
SYSTEM CONTROLLER
IC1703 (6/6)
AC POWER
DETECT
Q54
–5V
REGULATOR
IC951
V–5V
F1
F2
FLUORESCENT
INDICATOR TUBE
(FL1603)
–18V
BIAS
B–
BIAS
B+
– 15V
+15V
+15V
REGULATOR
IC955
-2
-1
8
Ω
4
Ω
IMPEDANCE
SELECTOR
S901
T901
MAIN POWER
TRANSFORMER
42
D.POWER
119
LIMITTER,OUT
43
V.POWER
55
RSTX
60
STOP
1
PW RY
8
SUB T
B+ SWITCH
Q956, 957
STBY +3.3V
RESET SIGNAL
GENERATOR
IC1602
+5V
REGULATOR
IC953
RECT
D908
D908
F904
F903
F906
F905
RECT
D914
D914
F1
RELAY
DRIVE
Q51
RY1
(AC IN)
B+ SWITCH
Q958, 959
(AEP, UK)
Singapore
Malaysia models
EXCEPT
Singapore
Malaysia models
D909
B– SWITCH
Q953 – 955
Q953 – 955
+2.5V
D+5V
–18V
REGULATOR
Q903
RECT
D912, 913,
915, 916
LIMITER SWITCH
Q2601, 2603
THERMAL DETECT
Q960 – 962
LIMITER SWITCH
Q2602
B–
+24V (RY)
B+
– 15V
REGULATOR
IC954
RECT
D903 – 906
B+ SWITCH
Q52, 53
RECT
D58
EXCEPT
Singapore
Malaysia models
STR-DB795
23
23
STR-DB795
•
Circuit Boards Location
PRI board
DC1 board
SEC (1) board
AC board
4-8 board
STAY 4 board
COMP-V board
TUNER UNIT
STAY 3 board
VOL board
DISPLAY board
FUN board
DIRECT board
HP-V3 board
SEC (3) board
SBL board
DC2 board
A CLASS board
MAIN board
DIGITAL board
AU-IN board
VIDEO-AU board
VIDEO board
S-VIDEO board
SP-A board
SP-B board
•
Note for Printed Wiring Boards and Schematic Diagrams
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
•
All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
• 2
: nonflammable resistor.
• C
: panel designation.
• A
: B+ Line.
• B
: B- Line.
• H
: adjustment for repair.
•
Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : TUNER
(
under no-signal conditions.
no mark : TUNER
(
) : VIDEO 1
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
•
Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Circled numbers refer to waveforms.
•
Signal path.
F
: TUNER
J
: AUDIO (ANALOG)
c
: AUDIO (DIGITAL)
E
: VIDEO
•
Abbreviation
AUS
AUS
: Australian model
KR
: Korean model
MY
: Malaysia model
SP
: Singapore model
TW
: Taiwan model
•
Indication of transistor
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
STR-DB795
24
24
STR-DB795
A18
R1530
R1560
R1224
R1204
R1216
R1602
R1112
R1672
FB1101
R1640
FB1104
D1001
R1111
IC1103
R1711
R1107
FB1401
R1705
R1104
R1664
R1114
R1215
IC1101
IC1201
R1633
IC1202
IC1102
R1213
R1574
R1437
IC1604
R1699
IC1503
C1401
R1217
R1221
R1502
R1508
R1214
R1122
R1639
R1109
R1693
R1605
R1102
IC1504
C1115
R1665
R1692
R1124
R1650
R1584
R1616
L1901
R1710
R1110
R1101
C1410
D1101
R1105
R1690
C1104
FB1105
IC1502
C1124
R1645
R1608
R1123
R1611
R1509
R1603
R1108
R1641
C1117
R1716
Q1602
R1601
R1222
R1540
C1109
C1230
D1905
R1117
IC1401
R1620
R1647
C1110
R1648
FB1601
R1212
R1100
IC1602
R1674
C1114
IC1501
C1612
R1127
R1612
FB1503
D1601
R1113
R1698
R1503
R1507
R1609
R1638
D1906
D1907
R1202
R1673
C1101
R1646
R1501
R1694
R1520
R1550
R1644
R1649
R1642
R1118
R1119
R1308
C1640
IC1402
IC1581
IC1561
IC1541
IC1521
FB1407
IC1204
C1233
R1658
R1651
R1652
R1653
R1629
Q1601
Q1603
R1622
R1625
R1630
R1667
R1623
R1656
R1676
R1677
R1678
R1679
R1600
Q1607
D1603
R1669
R1624
R1570
R1604
R1564
R1594
IC1703
R1721
R1680
R1681
FB1604
R1714
R1715
R1715
R1696
R1637
R1671
C1619
C1601
JR1688
C1618
C1634
R1634
C1670
R1154
C1154
C1152
R1643
R1722
R1723
R1724
X1101
R1683
R1657
R1661
D1604
R1684
R1121
R1120
E
E
E
8
5
1
1
24
12
1
4
8
5
13
4
1
(EXCEPT AEP, UK)
36
108
73
72
37
109
144
E
1
4
4
1
5
8
8
5
1
4
8
5
1
4
8
5
1
4
1
1
1
1
3
5
4
48
37
13
24
12
36
25
4
8
5
8
16
9
8
5
1
22
44
23
1
120
91
31
60
30
90
61
1
1
48
37
13
24
12
36
25
8
16
9
(AEP, UK)
1
4
8
(COMPONENT SIDE)
DIGITAL BOARD
1-863-045-
11
(12)
1
2
3
4
5
6
7
8
9
10
11
12
13
A
B
C
D
E
F
G
H
I
J
K
1
5
3
4
D1001
I-2
D1101
G-3
D1601
J-11
D1603
E-10
D1604
I-13
D1905
D-9
D1906
D-9
D1907
D-8
IC1101
F-3
IC1102
K-2
IC1103
E-3
IC1201
G-6
IC1202
E-6
IC1204
H-8
IC1401
I-10
IC1402
J-10
IC1501
I-3
IC1502
I-4
IC1503
H-2
IC1504
H-4
IC1521
J-8
IC1541
J-7
IC1561
J-5
IC1581
J-4
IC1602
D-12
IC1604
H-9
IC1703
G-11
Q1601
J-12
Q1602
J-12
Q1603
J-12
Q1607
E-9
•
Semiconductor
Location
Location
Ref. No. Location
:Uses unleaded solder.
6-7. PRINTED WIRING BOARD – DIGITAL Section (1/2) –
•
See page 23 for Circuit Boards Location.
STR-DB795
25
25
STR-DB795
C1513
CN1103
C1910
C1102
C1116
C1119
CN1109
C1554
IC1107
C1404
IC1902
X1601
IC1106
C1501
IC1105
C1105
CN1108
C1627
C1417
C1584
C1544
C1908
IC1403
X1201
C1504
CN1101
C1507
C1403
C1402
C1906
C1409
C1126
CN1102
C1212
CN1110
C1524
EB1101
IC1904
C1407
C1406
C1534
C1606
C1574
C1914
IC1905
C1211
CN1107
C1564
C1912
IC1903
C1915
CN1106
C1594
IC1104
IC1901
CN1105
CN1112
C1151
J1101
CN1104
CN1111
JR1210
C1593
C1592
R1590
R1592
R1591
R1593
C1503
JR1121
C1617
C1206
C1415
R1553
R1522
R1534
R1523
C1221
C1510
R1552
C1231
R1424
C1207
FB1201
C1311
R1220
C1103
D1502
C1523
R1208
R1580
C1905
C1132
C1204
C1209
R1505
C1563
R1210
C1562
R1562
R1582
C1214
R1521
C1512
C1553
D1501
R1504
C1911
R1524
C1532
C1552
FB1501
R1203
C1210
C1543
C1413
C1120
C1121
FB1102
R1201
C1220
C1542
C1522
R1116
C1203
R1115
R1541
C1502
C1202
C1213
R1561
R1563
R1583
C1582
C1112
C1127
R1432
C1219
R1572
C1511
C1218
C1130
C1216
C1118
C1412
C1583
C1913
C1533
C1122
R1364
C1111
R1544
C1408
C1416
C1506
C1123
R1205
C1208
JR1200
C1131
R1554
R1533
C1310
R1543
R1532
C1106
R1573
C1508
C1108
C1405
C1572
C1514
R1581
C1411
R1422
FB1603
FB1502
R1219
C1113
C1414
FB1203
R1542
R1512
R1402
C1309
R1531
C1916
FB1202
R1431
C1205
C1505
C1129
R1421
C1227
R1434
R1207
R1571
R1314
R1401
C1201
R1209
R1551
R1218
C1573
C1107
R1106
C1418
R1506
R1206
FB1605
C1100
C1509
C1909
JR1201
C1234
C1235
R1226
R1655
R1632
R1606
R1607
R1610
R1617
R1618
R1619
R1717
R1613
R1614
R1615
R1695
R1675
R1701
R1702
R1704
R1703
R1712
R1713
C1659
C1658
C1608
C1609
C1610
C1611
C1638
C1639
C1603
R1687
R1636
R1304
FB1602
R1628
R1627
C1613
C1614
R1682
R1626
R1635
C1620
C1605
R1719
R1718
R1305
R1720
R1666
R1668
R1691
R1654
JR1113
JR1112
JR1114
C1633
C1624
C1631
C1635
C1312
C1602
C1626
R1697
C1672
C1675
C1676
C1673
C1674
IC1151
R1156
C1153
R1153
R1151
R1152
R1631
C1632
JR1211
C1671
R1621
JR1214
R1659
R1660
D1602
R1685
8
5
1
4
1-863-045-
11
(12)
(CONDUCTOR SIDE)
DIGITAL BOARD
TUNER UNIT
SUPPLIED WITH THE
ASSEMBLED BLOCK
COAXIAL
FM 75
Ω
ANTENNA
TU301
AM
(AEP, UK)
(CHASSIS)
3
1
3
1
3
1
3
1
3
1
(CHASSIS)
OPTICAL
MD OUT
COAXIAL IN
SA-CD/CD
COAXIAL IN
DVD
IC1107
OPTICAL
MD IN
IC1106
OPTICAL
TV/SAT IN
IC1105
OPTICAL
DVD IN
IC1104
DIGITAL
5
MAIN BOARD
CN403
6
MAIN BOARD
CN402
1
1
1
1
1
3
5
3
(FOR CHECK)
5
4
2
(AEP, UK)
3
3
1
(EXCEPT AEP, UK)
(AEP, UK)
4
DC2 BOARD
CN952
2
DC1
BOARD
CN907
1
MAIN
BOARD
CN419
51
S-VIDEO
BOARD
CN1111
COMP-V
BOARD
CNP352
52
SEC (3)
BOARD
BOARD
CN57
53
3
DISPLAY
BOARD
CN1001
1
3
1
5
1
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D
E
F
G
H
I
J
K
L
(Page 50)
(Page 38)
(Page 32)
(Page 38)
(Page 34)
(Page 50)
(Page 52)
(Page 48)
(Page 38)
6-8. PRINTED WIRING BOARD – DIGITAL Section (2/2) –
:Uses unleaded solder.
•
See page 23 for Circuit Boards Location.
D1501
H-12
D1502
H-12
D1602
J-2
IC1104
E-14
IC1105
F-14
IC1106
G-14
IC1107
H-14
IC1151
K-13
IC1403
J-6
IC1901
D-6
IC1902
D-8
IC1903
C-12
IC1904
C-5
IC1905
C-8
•
Semiconductor
Location
Location
Ref. No. Location
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