Ic Block Diagram - NAD C 521 Service Manual

IC BLOCK DIAGRAM

U101: LA9240
FIN2
FIN1
TB
TE–
TE
TESI
SCI
TH
TA
TD–
TD
JP
TO
FD
U301: LC78621ED
DEFI
1
Slice level
EFMIN
11
control
SYNCHRONIZATION
DETECTION
FSEQ 22
EFM DEMODULATION
CLV DIGITAL
CLV+
13
SERVO
CLV–
14
V/P 15
SUBCODE
PW,SBCK 59,61
SEPARATION
57,60
SBSY,SFSY
Q CRC
MICROPROCESSOR
63,65
WRQ,SQOUT
INTERFACE
CQCK 67
COIN 66
SERVO
RWC 64
COMMAND
DEMO 30
64 63 62 61
APC
1
2
VCA
I/V
E 3
BAL
VCA
F 4
5
TE
6
7
8
T.SERVO & T.LOGIC
9
10
11
12
F.SERVO & F.LOGIC
13
14
15
16
17 18
VCO clock Oscillator
Clock control
C1 AND C2 ERROR DETECTION
AND CORRECTION
FLAG PROCESSING
60 59 58 57 56 55 54 53 52 51 50
REF
RF DET
- com
INTER FACE
SPINDLE SERVO
19 20 21 22 23 24 25 26 27
2K x 8-bit RAM
Level meter
Peak meter
Crystal oscillator system
Timing generation
17
49
48 NC
47 TBC
46 FSC
SLC
45 DGND
44 SLI
43 SLC
42 RFS–
41 RFSM
RF Amp
40 CV+
39 CV–
38 SLOF
37 HFL
36 TES
35 TOFF
34 TGL
SLED SERVO
33 JP+
28 29 30 31 32
RAM address
generator
42
Interpolation
45
and muting
44
Digital
56
output
38
Antishock 39
interface
40
41
Digital
attenuator
36
8x oversampling
35
digital filters 34
33
1bit DAC
LRSY
C2F
ROMXA
DOUT
ASDACK
ASDFIN
ASDFIR
ASLRCK
DACKO
DFOLO
DFORO
LRCKO