Sony SAVA-27 Service Manual ▷ View online
SECTION 2
DISASSEMBLY
– 5 –
2-1.
REMOVAL AMPLIFIER BLOCK
1
Grill frame assembly
2
Ornament frame
3
Three tapping screws
(4
×
20)
4
Front frame assembly
5
Four tapping screws
(4
×
20)
7
Display panel assembly
!§
One connector
PS Board
!∞
Back panel
8
5th tapping screws (4
×
16)
9
8th tapping screws
(4
×
16)
!º
Three tapping screws (4
×
16)
!¡
6P connector
!™
5th screws
(BVTP 3
×
8)
!£
Four screws
(BVTP 3
×
8)
!¢
Two screws
(BVTP 3
×
8)
!¶
Amplifier
SDN651
6
Flat type wire
(27core)
SECTION 3
DIAGRAMS
3-1.
CIRCUIT BOARDS LOCATION
– 6 –
INPUT board
MAIN board
POWER board
POW-SW board
POW-SR board
POW-CN board
POW-L board
POW-R board
DOLBY board
PS board
T1 board
T2 board
KEY board
DISPLAY board
– 20 –
3-6.
IC PIN FUNCTION
• IC501 SYSTEM CONTROL (UPD78043FGF-012-3B9)
Pin No.
1 to 7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53 to 70
71
72 to 77
78 to 80
I/O
O
—
O
O
O
O
O
O
I
O
I
—
—
—
O
O
O
O
O
I
I
I
—
I
I
—
—
I
O
O
O
O
—
I
I
—
—
I
—
—
—
—
O
O
O
—
O
—
O
O
Description
FL gride signal output
Power supply (+4.7V)
Power relay output
Dolby IC enable output
Dolby IC data output
Dolby IC clock output
Front speaker mute output
Center speaker mute output
HCD connector input
Super woofer mute output
Reset signal input
Connected to ground
Connected to ground
Ground
Volume IC enable output
Volume IC data output 2
Volume IC clock output 2
Volume IC data output 1
Volume IC clock output 1
Line input level
AD input for key
AD input for key
Power supply (+4.7V)
Analog reference voltage input
STOP input
Not used
Ground
X'tal (5MHz)
X'tal (5MHz)
Rear speaker mute
Connected to ground
Super woofer boost
Power supply (+4.7V)
Extermal center speaker switch input
TV SIRCS enable switch input
Connected to ground
Connected to ground
SIRCS input
Connected to ground
Connected to ground
Connected to ground
Connected to ground
LED output
LED output
LED output
Power supply (+4.7V)
FL segment signal output
Power supply (–25V) for FL segment signal output
FL gride signal output
FL gride signal output
Pin Name
7G to 1G
VDD
POWER RY
PLO/DELAY-CE
PLO/DELAY-DATA
PLO/DELAY-CLK
FRONT MUT
CENTER MUT
HCD IN
S/W MUT
RESET
—
—
AVSS
VOL CE
VOL DI1
VOL CL1
VOL DI2
VOL CL2
AUTO SW
KEY 1
KEY 0
AVDD
AVREF
STOP
XT2
Vss
X1
X2
REAR MUT
REAR POWER
S/W BOOST
—
CENTER EXT-SW
TV/SW
—
—
INT SIRCS
—
—
—
IC
STANDBY LED
READY LED
OPRATE LED
VDD
S24 to S7
VLOAD
S6 to S1
10G to 8G
• Abbreviation
FL : Fluorescent indicator tube
– 21 –
3-7.
IC BLOCK DIAGRAMS
1
2
3
4
5
6
7
8
9
15
10
11
12
–
+
13
14
16
21
18
19
25
17
24
22
23
20
34
32
33
29
30
35
28
31
27
26
36
40
39
38
37
41
42
NOISE
FILTER
NOISE
CH
BALANCE
CONTROL
VR
CONTROL
LPF
V REF
VR
VR
NOISE
GENERATOR
VCA
VCA
VCA
VCA
VCA
VCA
VCA
VCA
LPF
LPF
RECT
RECT
RECT
RECT
P. S.
P. S.
CMODE
MUTE
DIVIDER
OSC
CONTROL
CTRIM
LOG
DIFF
DIFF
LOG
DIFF
DIFF
DUAL T
CONTROL
L-IN
R-IN
V
SS
CLK
DATA
V
CC
L-OUT
R-OUT
S-OUT
C-OUT
ENABLE
OSC1
CMODE-CAP.
C-TRIM DC CUT
R-BPF1
R-BPF2
R-BPF3
DC CUT
DC CUT
L-R RECT
L+R RECT
VCS-TH
VCS-1
VCS-2
BPF1
BPF2
VREF
S-CH DC OUT
C-CH DC OUT
L-CH DC OUT
R-CH DC OUT
VREF
L-BPF1
L-BPF2
L-BPF3
DC CUT
DC CUT
R RECT
L RECT
VLR-TH
VLR-1
VLR-2
IC301
LA2786
IC701
µ
PC1237HA
1
2
3
4
5
6
7
8
OVER LOAD DET
F/F
OFFSET DET
LATCH/
AUTORESET
V
CC
ON
MUTE
AC OFF
DET
V
CC
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