Sony STR-DB725 / STR-DB825 Service Manual ▷ View online
– 47 –
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71 to 78
79
80 to 88
89 to 100
O
O
O
O
O
—
I
O
O
I
O
O
I
I
O
I
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
—
O
O
Direct pass relay
Surround relay
Center relay
Front relay
Mix/sub relay
+5 V
Protector in
Power relay
Bass boost
Speaker off
Volume –
Volume +
Function control A
Function control B
Volume LED
Power switch in
5.1/DVD input LED
Direct pass LED
Muting LED
Tone LED
Surround LED
Index LED
PHONO LED
TUNER LED
CD LED
TAPE/MD LED
TV/LD LED
VIDEO 3 LED
VIDEO 2 LED
VIDEO 1 LED
FL segment signal output
FIP pull down (–35 V)
FL segment signal output
FL gride signal output
DIRECT.PASS
SUR.RY
CENTER.RY
FRONT.RY
MIX/SUB.RY
VDD.+5V
PROTECTOR.IN
POWER.RY
BASS.BOOST
SP.OFF
VOL–
VOL+
RE.A
RE.B
VOL LED
POWER.KEY
5.1.INPUT. LED
DIRECT.PASS.LED
MUTING.LED
TONE.LED
SURR.LED
INDEX.LED
PHONO.LED
TUNER.LED
CD.LED
MD/TAPE.LED
TV/DBS.LED
VIDEO3.LED
VIDEO2.LED
VIDEO1.LED
P1 to P8
VLOAD
P9 to P17
G12 to G1
Pin No.
Pin Name
I/O
Function
• Abbreviation
FL
: Fluorescent indicator tube
– 48 –
SECTION 4
EXPLODED VIEWS
4-1. CASE AND BACK PANEL SECTION
NOTE:
• Items marked “*” are not stocked since they are
seldom required for routine service. Some delay
should be anticipated when ordering these items.
should be anticipated when ordering these items.
• The mechanical parts with no reference number in
the exploded views are not supplied.
• Hardware (# mark) list and accessories and packing
materials are given in the last of this parts list.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
The components identified by
mark ! or dotted line with mark
! are critical for safety.
Replace only with part number
specified.
mark ! or dotted line with mark
! are critical for safety.
Replace only with part number
specified.
* 9
4-900-493-11 PANEL, BACK (DB825)
10
1-769-941-11 WIRE (FLAT TYPE)(11 CORE)
11
1-769-908-11 WIRE (FLAT TYPE)(9 CORE)
* 12
4-924-098-31 HOLDER, PC BOARD
* 13
3-703-244-00 BUSHING (2104), CORD
!
14
1-769-744-11 CORD, POWER
15
X-4949-523-1 FOOT ASSY (F50180S)
16
4-970-124-01 CUSHION (F50180S)
* 17
A-4407-575-A SURR BOARD, COMPLETE
!
CNJ909 1-526-794-11 OUTLET, AC (AC OUTLET)
1
4-210-291-01 SCREW, TAPPING
* 2
4-900-512-01 CASE (DB725)
* 2
X-4950-431-1 CASE ASSY (DB825)
3
1-769-877-11 WIRE (FLAT TYPE)(7 CORE)(90mm)
* 4
A-4417-192-A SP BOARD, COMPLETE
* 5
A-4407-581-A S VIDEO BOARD, COMPLETE
6
1-769-875-11 WIRE (FLAT TYPE)(7 CORE)(70mm)
* 7
1-670-097-11 VIDEO BOARD
8
1-693-409-11 TUNER
* 9
4-900-493-01 PANEL, BACK (DB725)
1
1
1
2
3
4
CNJ909
#2
#2
#2
#2
#2
#2
#2
#2
#2
14
13
5
6
7
8
17
9
10
11
10
12
15
15
16
16
Front panel
#1
#1
#2
#2
– 49 –
4-2. FRONT PANEL SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
67
4-900-491-01 BUTTON (MUTE)
* 68
1-670-099-11 FUNCTION BOARD
69
4-951-620-01 SCREW (2.6X8), +BVTP
* 70
A-4414-144-A DISPLAY BOARD, COMPLETE (DB725)
* 70
A-4414-171-A DISPLAY BOARD, COMPLETE (DB825)
71
1-783-777-11 WIRE (FLAT TYPE)(13 CORE)
72
1-773-024-11 WIRE (FLAT TYPE)(15 CORE)(320mm)
73
3-350-426-01 SPRING, RING
74
3-703-466-00 SPRING (6600)
75
4-942-568-41 EMBLEM (NO.5), SONY
76
4-900-577-01 SPRING (1)(R)
77
4-900-576-01 SPRING (1)(L)
78
4-998-207-11 INDICATOR (VOL)
79
4-999-431-01 LENS, LED
* 80
4-921-941-01 CUSHION (FL)
* 81
3-386-245-11 HOLDER (FL)
FL101
1-517-770-11 INDICATOR TUBE, FLUORESCENT
51
4-900-570-11 ESCUTCHEON (A-LID)
52
4-900-492-01 KNOB (LID)
* 53
4-900-569-01 ESCUTCHEON (M-LID)
* 54
4-900-579-01 COVER (STI)
55
X-4948-601-1 KNOB (FUNC) ASSY
56
X-3375-592-1 KNOB (VOL) ASSY
57
4-900-568-11 PANEL, FRONT (DB725)
57
4-900-568-21 PANEL, FRONT (DB825)
58
4-900-566-11 WINDOW
59
4-900-572-01 FULCRUM (L)
60
4-900-571-01 FULCRUM (R)
61
X-3375-589-1 BASE ASSY, PANEL
62
4-900-563-01 BUTTON (5)
63
4-957-383-01 KNOB (F14)
* 64
1-670-101-11 SP SWITCH BOARD
* 65
1-670-095-11 SW BOARD
66
4-900-565-01 INDICATOR (2)
51
#3
#2
52
53
58
not supplied
not supplied
not supplied
59
61
62
63
64
65
54
66
67
69
68
76
77
69
FL101
70
71
72
80
80
81
69
69
69
60
55
74
75
78
56
73
57
79
69
#3
– 50 –
4-3. CHASSIS SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
Q505
8-729-209-15 TRANSISTOR 2SD2012
Q506
8-749-010-25 IC MN2488-OPY-M
Q507
8-749-010-26 IC MP1620-OPY-M
Q555
8-729-209-15 TRANSISTOR 2SD2012
Q556
8-749-010-25 IC MN2488-OPY-M
Q557
8-749-010-26 IC MP1620-OPY-M
Q605
8-729-209-15 TRANSISTOR 2SD2012
Q606
8-749-010-25 IC MN2488-OPY-M
Q607
8-749-010-26 IC MP1620-OPY-M
Q705
8-729-209-15 TRANSISTOR 2SD2012
Q706
8-749-010-25 IC MN2488-OPY-M
Q707
8-749-010-26 IC MP1620-OPY-M
Q755
8-729-209-15 TRANSISTOR 2SD2012
Q756
8-749-010-25 IC MN2488-OPY-M
Q757
8-749-010-26 IC MP1620-OPY-M
!
T901
1-431-811-11 TRANSFORMER, POWER
* 101
1-669-443-11 H.P BOARD
* 102
1-670-100-11 VIDEO (3) BOARD
103
4-900-500-01 KNOB (BAL)
* 104
1-670-096-11 BALANCE BOARD
* 105
1-670-098-11 VOLUME BOARD
106
1-773-110-11 WIRE (FLAT TYPE)(19 CORE)
* 107
A-4414-176-A INPUT BOARD, COMPLETE
109
1-773-008-11 WIRE (FLAT TYPE)(15 CORE)(140mm)
110
3-905-609-11 SCREW (TRANSISTOR)
* 111
A-4414-843-A REAR AMP BOARD, COMPLETE
* 112
1-669-449-11 STANDBY BOARD
* 113
A-4407-589-A STANDBY (2) BOARD, COMPLETE
* 114
A-4414-175-A AMP BOARD, COMPLETE (DB825)
* 114
A-4417-193-A AMP BOARD, COMPLETE (DB725)
* 115
1-669-441-11 CONNECTOR BOARD
116
3-703-397-01 STOPPER, WIRING
117
4-900-386-01 SCREW
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.
line with mark ! are critical for safety.
Replace only with part number specified.
Q706
not supplied
not
supplied
supplied
not supplied
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
#2
not supplied
not
supplied
supplied
T901
Q705
Q707
Q756
Q755
Q757
Supplied
with
J701
with
J701
Supplied with
RV401
RV401
not supplied
not
supplied
supplied
101
102
103
104
105
106
107
116
109
110
110
111
112
113
110
117
114
115
Q557
Q555
Q556
Q607
Q605
Q606
Q507
Q506
Q505
Click on the first or last page to see other STR-DB725 / STR-DB825 service manuals if exist.