Sony CDX-C8850R, Service Manual

Page: 65 / 86

65
CONTROL
CIRCUIT
LOW VCC
DETECTOR CIRCUIT
WRITE/ERASE
PULSE TIMER
ERASE CIRCUIT
RY/BY
BUFFER
CHIP ENABLE/
OUTPUT ENABLE
CIRCUIT
I/O
BUFFER
DATA
LATCH
ADDRESS
LATCH
Y
DECODER
8,388,608
CELL
MATRIX
Y GATE
WRITE CIRCUIT
23
24 25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
DQ3
DQ11
VCC
DQ4
DQ12
DQ5
DQ13
DQ7
DQ14
DQ6
DQ10
DQ2
DQ9
DQ1
DQ8
DQ0
GND
CE
OE
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
21
22
A8
A9
A15
A14
A13
A12
A11
NC
RY/BY
WE
A7
A6
A4
A5
NC
NC
RESET
NC
47
48
45
46
A3
A2
A1
A17
A10
X
DECODER
A16
BYTE
GND
DQ15/A–1
A0
STB
STB
A18
IC871 TL1451ACDB-E20
IC805 MBM29F800TA
REFERENCE
VOLTAGE
LATCH
TRIANGLE
OSCILLATOR
VERF.
+2.5V
+2.5V
+
–
U.V.L.O
–
+
+
–
1
2 3
4
5 6 7 8
9 10 16 15 14 13 12 11
PWM
COMPA-
RATOR2
OUTPUT2
OUTPUT1
GND
PWM
COMPA-
RATOR1
VERF
S R R
VERF VERF
ERROR
AMP2
ERROR
AMP1
VREF/2
SHORT
CIRCUIT
PROTECTION
COMPARATOR
VCC
+
REF OUT S.C.P NON-INV- INPUT2 INV- INPUT2 FEED BACK2 DEAD TIME CONTROL2 OUT2 VCC
GND
OUT1
RT
NON-INV-
INPUT1
INV-
INPUT1
FEED
BACK1
DEAD
TIME
CONTROL1
CT