Sony DAV-EA20 / HCD-EA20 Service Manual ▷ View online
57
HCD-EA20
• Waveforms
– RF BOARD –
– DMB03 BOARD –
1
IC001
1
(DVDRFP)
4
IC001
tj
(RFAC)
3
IC001
r;
(FE)
100m V/DIV, 1 ms/DIV
200m V/DIV, 100 ns/DIV
500m V/DIV, 100 ns/DIV
800m Vp-p
0.3 Vp-p
1.3 Vp-p
2
IC001
el
(TE)
500m V/DIV, 1 ms/DIV
0.5 Vp-p
5
IC906
8
(XTO)
qa
to
qd
:Color bars video signal
6
IC906
9
(SO1)
9
IC906
3
(MO1)
7
IC906
q;
(SO2)
29.5 ns
37 ns
37 ns
29.5 ns
1 V/DIV, 10 ns/DIV
1 V/DIV, 10 ns/DIV
1 V/DIV, 10 ns/DIV
1 V/DIV, 10 ns/DIV
4.5 Vp-p
4.2 Vp-p
4.6 Vp-p
1.5 Vp-p
8
IC906
qd
(SO3)
29.5 ns
1 V/DIV, 10 ns/DIV
4.6 Vp-p
5.6 Vp-p
q;
IC901
r;
(XTAL)
50 ns
1 V/DIV, 20 ns/DIV
3.8 Vp-p
qa
IC207
<zcz
(VDAC_0)
500 mV/DIV, 20
µ
s/DIV
H
qs
IC207
<zx,
(VDAC_1)
500 mV/DIV, 20
µ
s/DIV
1.2 Vp-p
H
qd
IC207
<zxb
(VDAC_2)
500 mV/DIV, 20
µ
s/DIV
1.3 Vp-p
H
58
HCD-EA20
– UCOM BOARD –
– PANEL BOARD –
– I/O BOARD –
qf
IC501
qg
(X2)
200 ns
3.1 Vp-p
1 V/DIV, 100 ns/DIV
10 V/DIV, 4
µ
s/DIV
qg
Q803 collector
8.0
µ
s
24.4 Vp-p
H
2.7 Vp-p
H
2.0 Vp-p
H
2.7 Vp-p
qh
IC252
ea
(VOUTb)
qj
IC252
ed
(COUT)
1 V/DIV, 20
µ
s/DIV
1 V/DIV, 20
µ
s/DIV
ql
IC251
2
(OUT)
1 V/DIV, 20
µ
s/DIV
w;
IC291
qf
(XO)
231 ns
3.3 Vp-p
1 V/DIV, 100 ns/DIV
qk
IC252
wk
(YOUTb)
1 V/DIV, 20
µ
s/DIV
2.2 Vp-p
H
qh
to
ql
:Color bars video signal
59
HCD-EA20
6-27. IC BLOCK DIAGRAMS
– AMP BOARD –
IC301 STK402-920
2
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
CH5 IN
CH5 NF
CH4 IN
CH4 NF
CH4 OUT
CH5 OUT
+VCC
-VCC
CH1 OUT
+PRE VCC
-PRE VCC
CH1 NF
-VCC
+VCC
CH2 OUT
SUB GND
CH1 IN
BIAS
CH2 NF
CH2 IN
CH3 IN
CH3 NF
CH3OUT
-PRE VCC
SUB
CH1
CH2
CH4
CH5
CH3
TR1
TR6
R1
R2
R3
R4
TR3
TR4
TR2
TR5
C1
BIAS CIRCUIT
C2
R5
R6
R7
R8
C3
C4
PRE DRIVER
IC CH2
PRE DRIVER
IC CH1
1
2
3
4
5
6
7
8
9
10
11
12
-VCC
+VCC
CH1 OUT
CH2 OUT
+PRE
SUB
SUB
GND
CH1 IN
CH1 NF
ST
-BY
CH2 NF
CH2 IN
IC401 STK403-030
60
HCD-EA20
IC501,521,551 NJM4580E(TE2)
1
2
3
4
5
6
7
8
A OUT
A –IN
A +IN
V–
V+
B OUT
B –IN
B +IN
A
B
VR 2
VR 1
VIN1
VOUT1
GND
DATA
VIN2
VOUT2
VCC
CLOCK
7
2
3
4
8
1
REF AMP
VOL AMP 2
VOL AMP 1
6
LOGIC
CONTROL
5
VREF
IC502,522,552 M62429P
OVER
CURRENT
PROTECTOR
LATCH
&
DRIVER
OVER HEAT
PROTECTOR
REGULATOR
ON/OFF
SOFT
START
+
–
–
+
–
–
RESET
VREF
COMPARATOR
ERROR AMP
OSC
1
VIN
2
SW OUT
3
GND
4
VOS
5
ON/OFF
IC951 SI-8120JF
OVER
CURRENT
PROTECTOR
LATCH
&
DRIVER
OVER HEAT
PROTECTOR
REGULATOR
+
–
–
+
–
–
RESET
VREF
COMPARATOR
ERROR AMP
OSC
1
VIN
2
SW OUT
3
GND
4
VOS
5
S.S
IC952 SI-8050S-LF1101
OVER
CURRENT
PROTECTOR
LATCH
&
DRIVER
OVER HEAT
PROTECTOR
REGULATOR
ON/OFF
SOFT
START
+
–
–
+
–
–
RESET
VREF
COMPARATOR
ERROR AMP
OSC
1
VIN
2
SW OUT
3
GND
4
VOS
5
ON/OFF
IC953 SI-8033JF
1
1OE
56 1LE
LE
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
LATCH
LATCH
28
2OE
29 2LE
OE
LE
OE
1D1
1D2
GND
1D3
1D4
VCC
1D5
1D6
GND
1D7
1D8
1D9
1D10
2D1
2D2
2D3
GND
2D4
2D5
2D6
VCC
2D7
2D8
GND
2D9
2D10
1Q1
1Q2
GND
1Q3
1Q4
VCC
1Q5
1Q6
GND
1Q7
1Q8
1Q9
1Q10
2Q1
2Q2
2Q3
GND
2Q4
2Q5
2Q6
VCC
2Q7
2Q8
GND
2Q9
2Q10
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
– DMB03 BOARD –
IC216 SN74ALVCH16841DGGR
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