Bose CD-20 Service Manual page 57

CD MECHANISM IC BLOCK DIAGRAMS
DIN
10
Input Interface
DCKI
9
Zero Detect
DFS1
11
DFS2
12
13
MUTEO
3
DS
RSTN
14
DVSS 15
16
DVDD
AVDO1 17
18 19
1
A
2
_
+
B
3
_
+
4
V-
IC 203/204 (NJM4560M)
Operational Amplifier
ATTN
LRCI
8
L
R
Infinity
Timing
Control
PWM Data
L
Generation
R
Block
21 22
20
IC 201 (SM5871AS) D/F and D/A Converter
8
V+
7
6
5
MODN
6
7
Filter Calculate
Attenuation
Calulate
Block
L
R
Noise Shaper
Calculate
Block
23 24
25
Vcc
5
+
_
+
_
1
GND
IC 604 (M62007FP)
57
TSTN
5
INTERUPT SIGNAL
GENERATION BLOCK
RESET SIGNAL
GENERATION BLOCK
4
4 CKO
XVSS
2
XTO
1
XTI
28
27 XVDO
AVDO4
26
___
2
INT
_____
3
RESET