Sharp HT-CN300 Service Manual page 21

R950
10K
80 79 78 77 76 75 74 73 72 71 70 69
81 P07
82 P06
83 P05
84 P04
85 P03
86 P02
87 P01
88 PO0
89 AN7
90 AN6 IX0489AW
91 AN5
947 1K
92 AN4
SYSTEM MICROCOMPUTER
948 1K
93 AN3
94 AN2
95 AN1
AVSS
96
97 AN0
98 VREF
815
99 AVCC
0.1
P97
100
C916
0.022
1 2 3 4 5 6 7 8 9 10111213141516171819 20 21 22 23 24 25 26 27 28 29 30
+B
C912
47P
(CH)
R905
22
+B
+B
R912
10K
7
R928
10K
+B
68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
P44 50
P45 49
R924
P46 48
R923
P47 47
R922
P50 46
R925
P51 45
P52 44
IC710
P53 43
P54 42
R921
P55 41
P56 40
R920
P57 39
R919
P60 38
R918
P61 37
R917
P62 36
R916
P63 35
R934
P64 34
R935
P65 33
R987
P66 32
R936
P67 31
R915
1K
R911
1K
R910
10K
C901
0.22
R907
10K
+B
X901
R906
8.38 MHz
820
C902 C905
C903
15P 18P
15P
(CH) (CH)
(CH)
8
Figure 21 SCHEMATIC DIAGRAM (8/17)
+3.3V +B
1K
1K
10K
1K
R766
10K
10K
1K
1K
1K
1K
1K
1K
1K
220
220
R913 R914
10K
10K
ATT20DB
FANCNT
+B
+B
FM SIGNAL
9 10
– 21 –
1
2
3
4
5
6
7
8
9
+B
[3]
44
[3]
45
CNP708
10
11
12
13
14
CNP712
11
HT-CN300
39 F_RLY [3]
40 C_RLY [3]
41 S_RLY [3]
42 W_RLY [3]
42 W_SP_RLY
[3]
7 DSP_INTREQ
[1]
8 DSP_ABOUT [1]
9 ROM [1]
10 DSP_UC17 [1]
11
DSP_UC16 [1]
DSP_UC15
12 [1]
13 DSP_RESET
[1]
14 DSP_CS [1]
15 DSP_SCCLK [1]
16 DSP_SCDOUT [1]
17 DSP_SCDIN [1]
F_BUSY
F_SCLK
F_RXD
F_TXD
RESET
F_VCC
GND
VCC
VCC
18 SDA [1]
19 SCL [1]
FW8
1
1
20DB_ATT
2
RLY_F_SP
3
FAN_CNT
4
RLY_C_SP
5
CCB_CE0
6
RLY_S_SP
7
CCB_CLK
8
RLY_W_SP
9
DATA
THRMO
CCB_DO
PROTECT
DGND
POWER_LEVEL
14
CON301
46
POWLEV [3]
TO
47 PROTECT
[3]
DISPLAY PWB
48
[3]
THERMO
P17 12-C
FW9
1
1
CCB_CE0
2
CCB_CLK
3
DATA
4
CCB_DO
5
AGND
6
TUNER_R
7
AGND
8
TUNER_L
8
TUN_L [3]
49
50 AGND_A [1,3]
51 TUN_R
[3]
CON301
TO
TUNER PWB
P27 12-H
12