Sharp HT-DD5000W Service Manual page 44

IC1 RH-iX0004SJZZ: System Microcomputer (IX0004SJ)
TUN_DI
TUN_DO
TUN_CK
TUN_CE
TUN_MUTE
TUN_SD
TUN_ST
OSC2
OSC1
MMOD
VREF
KEY1
KEY2
KEY3
AREA
SP_LEVEL
MODEL
POSISTOR
VREF+
IC203 VHiLA1833//-1: FM/AM IF MPX. (LA1833)
OSC
BUFF/
FM SD
ADJ OSC
24
ALC
BUFF
LEVEL
DET
FM
IF
1
FM IF IN AM MIX
OUT
1
2
3
4
5
6
7
8
VDD
9
10
11
VSS
12
XI
13
XO
14
15
16
17
18
19
20
21
22
23
24
ALC 25
AM RF
AFC IN
23
22 21
AM
AM
AM
RF.AMP
MIX
OSC
AM
IF
AM/FM
IF
COMP
BUFF
S-CURVE
FM
DET
GND
REC
2 4
3
REG AM IF IN GND
Figure 43 BLOCK DIAGRAM OF IC
IC1
IX0004SJ
PLL
20 19 18
17
ACC
AM
DET
TUNING
DRIVE
5 6 7
Tu-LED ST-LED FM-DET
– 43 –
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
R-CH
IN OUT
15 14
16
P-DET STEREO
SW
Vcc
8 9 10 11
Vcc AM/FM
IF-BUFF
HT-DD5000W
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
10G
9G
8G
7G
6G
5G
4G
3G
2G
1G
LED1
FAN
PROTECT
L-CH
OUT
13
PILOT
CANCEL
PILOT
DET
12