Sony Ba5 Service Manual

— 21 —
KV-25FS12 / 25FS12C
5-2.  PRINTED WIRING BOARDS AND 
SCHEMATIC DIAGRA MS
•  All capacitors are in µF unless otherwise noted. pF : µµF 50V or less 
are not indicated except for electrolytics and tantalums.
•  All electrolytics are in 50V unless otherwise specifi ed.
•  Indication of resistance, which does not have one for rating electrical 
power, is as follows: 
  Pitch : 5mm       
Rating electrical power : 1/ 4 W (CHIP: 1/10W)
•  All resistor are in ohms.
  KW = 1000W     MW = 1000KW
• 
 : nonfl...

KV-25FS12 / 25FS12C 
— 22 —
BA5-902-BD
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13246
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7891
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1234
V
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2345
78
910111214
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18
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12345
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CN2002
CN2009 CN460
J201
CN406 CN450
D2001
CN601
CN501 T501
T504J401
CN408 CN407
CN2001 CN506CN402...

KV-25FS12 / 25FS12C 
— 23 —
 BLOCK DIAGRAM (2 OF 2)
BA5-902-BD
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91
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CN1002
CN1004
CN1003
CN1001CN1000
CN1303 CN705 3P
N/S COIL -
N/S COIL + CN701
HV
RESET
GND STBY 7.5V
I-PROT
GND
MAIN 1
MAIN 2
AFT
AGC MUTE
O-MON0
O-SAP
I-SAP
I-STERENSEL-0 SEL-1MUTEHP RELAYDGC
Y/C JUNGLE
IC1301 CONTROL
TUNING SYSTEM
IC1001
VM
VD- VD+EW ABLHD
FOR JIG
IC1701
H...

— 24 —
KV-25FS12 / 25FS12C 
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A BOARD SCHEMATIC DIAGRAM
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6
1234567
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IO
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123456789...

— 25 —
KV-25FS12 / 25FS12C 
68
4
7
32
5
9  
1
A BOARD WAVEFORMS
2.5 Vp-p (H)
182.8 Vp-p (H)23.4 Vp-p (H) 1.08 KVp-p (H)
30.4 Vp-p (V)54.3 Vp-p (V)
31.1 Vp-p (V)
5.0 Vp-p (V)
174.3 Vp-p (H)
REF. NO. LOC. KV-25FS12 KV-25FS12C
C607  G-6 0.47µF 125V #
C612  G-8 680µF 250V 560µF 400V
C615  E-9 # 0.022µF 400V
C616  H-9 # 220PF 1KV
D609 H-9 # RU-1P
F601  H-5 6.3A/125V  6.3A/250V 
IC601  E-10 STR-F6426  STR-F6456 
R601  G-6 4.7M 1/2W #
R615  G-6 # 8.2M 1W
R627  G-9 390K 270K
R628  G-9 # 270K
R631  E-9 # 100K 3W...

— 26 —
KV-25FS12 / 25FS12C 
Supply
VoltageOutput 
State
SupplyFlyback
Generator
Flyback
Generator
Thermal
Protection Power
Amplifier Inv. Input
Non-Inv. Input
TDA8172
GndOutput
4 7 126
3
5
 IC502: TDA8172
TDA8580Q/N1
V
P1
3
IN 1
7
V
P2
15
IN 2
8
+
-
+
-
60
k
60
kV/l
V/l
+-OA
+
-OA
OUT 1 +
OUT 2 - 1
4
45 k
45 k
V
px
30 k
BUFFER
IN 4
IN 512
+
-60
k
60
kV/l
+-OA
+
-OA
OUT 3 -
OUT 4 + 14
17
45 k
45 k
11
BUFFERBUFFER
45
k
45
k V
px
+
-V/l
MUTE13
STANDBY
5DIAG 6DIAGNOSTICINTERFACE IN 310
PGND12PGND2169
IC402:...

KV-25FS12 / 25FS12C 
— 27 —
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I
A[POWER SUPPLY, DEFLECTION, TUNER/ IF, AUDIO, MTS]
DIODED618 G-2
D204 B-10 D619 D-2
D205 A-11 D620 E-7
D206 A-11 D622 F-3
D208 B-11 D623 F-3
D209 B-11 D624 H-2
D210 B-11 D625 G-2
D212 B-11 D626 G-2
D213 B-2 D627 H-2
D230 D-11 D628 G-2
D231 D-11 D2001 E-2
D400 E-1 D2002 F-1
D401 E-8 D2003 B-1
D501 H-8 D2004 A-3
D502 G-9 D2005 A-2
D503 G-9IC
D504 H-9 IC402 D-9
D505...

— 28 —
KV-25FS12 / 25FS12C 
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CB BOARD SCHEMATIC DIAGRAM
HKG G2
CV KR G1 G4HV KB
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35678910111213
G2
G1-1
H1
H2
G1-2
KB
KG KR G1-3G4
CV
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2
3
L701C705
R708R709R711
R712R713
D701 D702D703R714 D704R715 R716
C707
C710 C709
C708
R705
C701R707 C702C703 R702 R701 R700
R720
R721
R719 R704 R703
CN704
R706
J701
R717
R718
IC701
Q700 CN705
CN706CN702
CN701 IC702
Q701
R710 RV701
C704
C70610...

— 29 —
KV-25FS12 / 25FS12C 
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[RGB DRIVE, CRT DRIVE]
32  
CB  BOARD WAVEFORMS
1
132.8V p-p (H)135.9V p-p (H)140.6V p-p (H)
CB
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
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3C
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R
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1Q
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1
G
A
PS
P
A
R
K
GR
O
U
N
D
G
R
O
U
N...

— 30 —
KV-25FS12 / 25FS12C 
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K BOARD SCHEMATIC DIAGRAM
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2122232425262728293031323334353637383940
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JW407JW408JW405 R455
R456
L410 C475 C446
C440C490
R439 R430 R436R434
R438
R437
R432
R431C411
C406
C404
C441
CN450 CN402
C407R404 C417
C416C408
C405
C412 C415
C414
C413 C422 C423 R435C419 C418 C410C409
JR474
R433C447
C458
IC404
R468
R469R470
R403...