Logic Unit (Left Side) - Icom IC-RX7 Service Manual Addendum

SECTION 10. VOLTAGE DIAGRAM

• LOGIC UNIT (Left side)

DIAL
MMZ1005Y102CT
S21
EP1
DCK
UP
E
EP2
DUD
DN
MMZ1005Y102CT
TP70N00E2015F
KR0
MENU LEFT UP FAV
S6 S26 S15
KR1
OK DOW NR I GHT BACK
S2 S7 S11 S16
KR2
SCAN 123
S3 S8 S12 S17
KR3
SERCH 456
S4 S9 S13 S18
KR4
HOLD 789
S5 S10 S14 S19
KR5
POWE R 0 #
POWE R
S25 S22 S23 S24
CPU3V
I0 I0
RXF1 RXF0
*D9 *D12
I1 I1
*D7 *D10 *D13
KS0
KS1
KS2
B3 B2 B1 B0 KS3
CPU3V
NMI
FW E
MD2
TXD2
RXD2
SCK2
BDET Batt.DET
S20
KEY
10 - 1
26
27
28
29
R228 30
31
TXD2 10K
32
RXD2
33
SCK2
34
DUD
DCK 35
LDATA EP13 MMZ1005Y102CT 36
CKO R210 10K 37
POWE R 38
DATAC R217 10K 39
LIGHT R213 1k 40
AFON R214 1k 41
42
R239 43
R253
BEEP 47K 44
45
470K
46
10k
47
48
RTONE
CTONE 49
VSCAF 50
10k R6
CHG
TEMP
BATTI
HVIN
R3
R229
EP15
CPU3V
0 MMZ1005Y102CT
MP 7
3076
IC15
1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
4 5
VSS SDA
24LC512T
IC14
1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
4 5
VSS SDA
24LC512T
EEPROM
100
99
98
97
96
95
94
93
92
91
90
CPU
89
88
87
86
85
84
83
82
81
80
79
78
77
76
R31
R254
0
10k
R246 10K
R247 10K
R33
1M
X1 HVC376B R51
C23
D15
0.01
100K
CR-774
R5 10K
IC6
1 5
OU T CD
2
VDD
4
3
VSS NC
S-80928CNMC
RESET
29
LCDCS
LCDRES
LCDRS
LCDCK
LCDDT
LIGHT
R3C
R70 10K HVDET
R71 10K CHGC
LCK
LDATA
R211 10K VRSTB DATAC
R212 1k DASTB
R24 0
R2 LCDRES
LCDRS
LCDCK
LCDCS
LCDDT
470
EXB28V332 J VRCK
R84
CL_IN
CL_OUT
470
BDET
VRDATA
R83
I0
I1
CL_IN
CL_OUT
R189
NTCG16
CPU-MAIN
LCD
IMSA-9631S-27Y921
28
LCD Back Light
VCC VCC
LIGHT ON :2.2V
Q5 LIGHT OFF:0.0V
2SC4617
IC1
1 8
2 7
3 6
4 5
TC7W08FU
C lone Buff
2SA1832
R45 D16
IC8
1 8 Q8
18K 1SS400
2 7
3 6
R46
4 5 Q10
2SC4738
12K
TC7W04FU
CPU-LOGIC
*; Refer to "PARTS LIST."