Sony CDX-C90R Service Manual page 24

IC4 MB814400C-70PFTN (SERVO BOARD)
DQ1 1
DQ2 2
WE 3
WRITE
DATA INPUT
CLOCK
GENERATOR
CLOCK
GENERATOR
2
DECODER
CLOCK
GENERATOR
1
MODE
RAS
4
CONTROL
A9 5
A0
9
A1
10
A2
11
A3 12
VCC 13
IC7 BA6797FP-E2
28
LEVEL
–
VCC/2
1
DATA OUTPUT
BUFFER BUFFER
4M BIT
COLUMN SENSE AMP
MEMORY
I/O GATE
CELL
ROW
GENERATOR
DECODER
REFRESH
ADDRESS PRE-
ADDRESS
BUFFER DECODER
COUNTER
26 25 24
27 23
VCC/2 VCC/2
–
+
IN
LEVEL SHIFT
SHIFT
IN
+
VCC/2
2 3 4 5 6
IC601 BA6195FP-YT2
26 VSS
25 DQ4
25 24
DQ3
24
– +
CAS
23
22 OE
BOARD
BIAS
1 2 3 4 5 6
A8
18
17 A7
A6
16
15 A5
14 A4
22 20
21 19 18
VCC VCC
VCC/2
IN
LEVEL
7 8 9 10 11 12
– 64 –
23 22 21 20 19 18 17
THERMAL
SHUT DOWN
DRIVER
MUTE
+
LEVEL SHIFT
IN
–
+
– +
7 8 9 10 11 12
17 16 15
VCC/2
+ –
SHIFT
SHIFT
LEVEL
IN
+ –
VCC/2 VCC/2
13 14
16 15 14
–
+ –
13