Sony CDX-C90 Service Manual page 66

• IC Block Diagrams
IC1 CXA1791N-T4 (SERVO BOARD)
1
LD
APC VREF
PD AMP 1.25V
+
–
2
PD
PD1 3
–
+
VC
RF
IV AMP1
4
PD2
–
+
VC
RF
IV AMP2
5
GND
F 6
–
+
VC
F
IV AMP
E 7
–
+
VC
E
IV AMP
VR 8
9 VC
VC
10
NC
IC2 CXD2522R-T6
49
XEMP
50
XWIH
AM4 51
AM3
52
53
AM2
54
AM1
55
AM0
56
VDD
57
XQOK
GSCR 58
SCOR
59
NC
60
NC
61
NC 62
GRST 63
XRST
64
VC
APC
LD AMP
+
VCC
–
VC
–
+
RF
VC
SUMMING AMP
VC
–
+
FOCUS
ERROR AMP
VC
VC
–
+
VC
TRACKING
ERROR AMP
VCC
VC BUFFER
48 47 46 45 44 43 42 41
CPU I/F
ADDRESS MONITOR
WRITE
BASE
COUNTER
READ
BASE
COUNTER
DATA
DSP
LINKING
I/F
CONTROL
1 2 3 4 5 6 7 8 9 10 11
IC6 LB1638MTP-T1
GND 1
IN1 2
20 VCC
19 APC ON
VCC 3
18 RFI
IN2 4
17 RFO
GND 5
16 FE
IC551 LC89170M-TLM
15 FE BIAS
14 TE
EXCK
1
13 EI
2
SBSO
32 WORD X 8 BIT
12 EO
DUAL PORT RAM
3
SCOR
WFCK 4
5
MCK
11 NC
XMODE 6
GND 7
40 39 38 37 36
DRAM
VWA
SELECTOR
TIMING
GEN.
DAC
I/F
12 13 14 15 16
– 91 –
10 N.C.
9 OUT1
8 VS
7 OUT2
6 N.C.
CPU INTERFACE
CRC
CHECKER
TIMING
&
SYNCHRONIZATION
SIGNAL
PROTECTION
35 34 33
32 XCAS
31
D4
30
D3
29
D0
28 D1
27 XWE
I/F
26 XRAS
25 A9
24 VDD
23
A0
22 A1
21 A2
20 A3
19 C176
DIGITAL
18 DOUT
OUT
17 LRCK
VDD
14 VDD
13 DQSY
12 SRDT
11 SCLK
10 SW2
9 SW1
8 TEST