Front Unit (Inc. Logic/Dial/Sql/Vr Board's) - Icom IC-M504 Service Manual

SECTION 11 VOLTAGE DIAGRAMS
11-1 FRONT UNIT
LOGIC BOARD
IC10
TC74LCXR164245
1
1DIR
RD 2
1B1
WR 3
1B2
4
GND
RS 5
1B3
RESETB 6
1B4
L5V 7
VCCB
CS1B 8
1B5
9
1B6
10
GND
DB0 11
1B7
DB1 12
1B8
DB2 13
2B1
DB3 14
2B2
J2 15
GND
V4 DB4 16
2B3
V3 DB5 17
C94
2B4
V2 2.2 L5V 18
VCCB
DB6 19
V1
2B5
V0 DB7 20
2B6
21
C2-
C93 GND
C2+ 2.2 22
2B7
R119 23
C1-
100k 2B8
C1+ 24
2DIR
C3- C92
C3+ 2.2
R120
VOUT
C91 100k
to
VDD 3.3V 2.2
LCD
GND
DB7 DB7
R121
DB6 DB6
100k
DB5 DB5
DB4 DB4
DB3 DB3
R123
DB2 DB2
100k
DB1 DB1
DB0 DB0
E_RD RD
RW_WR WR
RS RS
RESETB RESETB
CS1B CS1B
Q1
BACKLIGHT
2SB1201
MAX 8.4V
MIN 5.3V
R74
100
DS13 DS12 DS11
FY1101F FY1101F FY1101F
LEDV
R75
100
DS16 DS15 DS14
FY1101F FY1101F FY1101F
R76
100
Q3
Q2
KTC4075
DS19 DS18
DS17 KTC4075
FY1101F FY1101F
FY1101F
R77
100
DS22 DS21 DS20
FY1101F FY1101F FY1101F
CP11 CP13 CP15
S1 S3
KEY KEY
CP12 CP14
S2 S4
KEY KEY
DS3 DS2
SML-311YT SML-311YT
DIAL BOARD
GND GND
S1
DIALA DIALA
A
DIALB DIALB
B
ENT ENT
COM
TP90N1007AE20
SQL BOARD
R1
S5V
SQLV
GND
TP96N97
VR BOARD
R1
VOL1
VOL2
VOLG
TP96N97
L5V
3.3V
3.3V
5.0V
48
1OE
47 RD
1A1
46 WR
1A2
IC3
45
GND
44 RS HN58X2464TI
1A3 C31
1
43 RESETB 0.01
1A4 A0
42 IC11 2
VCCA A1
S-817B33AMC 3
41 CS1B
1A5 A2
40 1 5 4
1A6 GND NC VSS
2
39
GND VIN
38 DB0 3.3V 3 4
1A7 VOUT NC
37 DB1
1A8
36 DB2
2A1
35 DB3
2A2
34
GND
33 DB4
2A3
32 DB5
2A4
31
VCCA
30 DB6
2A5
29 DB7
2A6
28
GND
27
2A7
26
2A8
25
2OE
L5V
R51
ENT
10
CH/WX
SCAN
HI/LO
R54
20k
DIM3
BE
UNLK
R56
OPTIN
18k
DIM2
L5V
R58
20k
DIM1
CS1B
R60
18k RESETB
DIM0
RS
WR
RD
CMPWR
BACKLIGHT
MAX 2.6V
MIN 1.6V
CP18
CP16 CP20
CLR
DTRS
S8
S5 S6 S10
KEY
KEY KEY KEY
CP17
CP19
HAIL
MENU
S7
S9
KEY
KEY
J3
GND GND
DIALA DIALA DIALA
DIALB DIALB DIALB
ENT ENT
S5V S5V
SQLV
SQLV SQLV
GND GND
VOL1
VOL1 VOL1
VOL2 VOL2 VOL2
MICG
VOLG VOLG
J6
KEY
to microphone
GND
HM-126
J4
PTT
HANG
MICG
to microphone
HM-126 MIC
SP-
AF
L5V
8
VCC
7
WP
6 ECK
SCL
5 EDATA
SDA
EXTOE
EDATA
ECK
CP4
TDEC
IC1
M30622MEP
RCV
51 25
P41/A17 P73/CTS2/RTS2/TA1IN/V
52 24 SEND
P40/A16 P74/TA2OUT/W
53 23 PWRON
P37/A15 P75/TA2IN/W
54 22 FOG
P36/A14 P76/TA3OUT
55 21 FOGC
P35/A13 P77/TA3IN
56 20
P34/A12 P80/TA4OUT/U
57 19
P33/A11 P81/TA4IN/U
58 18 PWR
P32/A10 P82/INT0
59 17 DSD70
P31/A9 P83/INT1
60 16 DSDM
VCC2 P84/INT2
61 15
P30/A8 P85/NMI
62 14 L5V
VSS VCC1
63 13 XIN
P27/AN27/A7 XIN
64 12 GND
P26/AN26/A6 VSS
65 11 XOUT
P25/AN25/A5 XOUT
66 10 RESET
P24/AN24/A4 RESET
67 9
P23/AN23/A3 P86/XCOUT
68 8
P22/AN22/A2 P87/XCIN
69 7 CNVSS
P21/AN21/A1 CNVSS
70 6 GND
P20/AN20/A0 BYTE
71 5 OPSTB
P17/D15/INT5 P90/TB0IN
DIALB 72 4 EXTSTB
P16/D14/INT4 P91/TB1IN
DIALA 73 3 PSTB
P15/D13/INT3 P92/TB2IN
74 2 BEEP
P14/D12 P93/DA0
DIM3 75 1
P13/D11 P94/DA1
5.0V
PWR
R43
12K
PTT
CP25
HANG
C336
47p
LBAT
Explanatory notes
CP22
VOLTAGE LINE
TX LINE CP23
RX LINE
COMMON LINE
S5V
PWRON
4.4V
RCV
SEND
VOL1
9.8304MHz
VOL2
0V BEEP
FOG
FOGC
EVCK
EVDATA
WXDEC
RCV SQL
SEND DSDM
TXDET
PWRON
FOG DSD70
FOGC
PWR
UNLK
PDATA
PSTB
R79 PCK
100k EXTSTB
L5V
EXTOE
OPSTB
OPTIN
DSD70
DSDM
13.8V
X1
R46
CR-790A
100
VCC
CNVSS
OPSTB
EXTSTB
PSTB
BEEP
R82
1k
CLORXD
L5V
MODEL
CLOTXD
IC9
KIC7W14FK
COMTXD
1
IC4 COMRXD 2
S-80942CNMC /NMEAI
3
RESET 1 5 4
OUT CD
2
VDD
3 4
VSS NC
HV
R44
47k
4.9V
R99
0
NMRXD
L5V S5V
IC6
PC357N6J000F
/NMEAI
NMTXD
R7
NMRXD
47k
SCLK
S5V
BUSY
Q5
2SC4081
NMTXD
Q6
KRC404
11 - 1
FRONT
unit
SP1
CP2
SP+
+
R1
S5V
3.9
-
CP3
SP-
W2
R37
180k
J1
SP+
SP+ SP+
SP-
SP- SP-
VCC
HV
S5V
GND
PWRON
RCV
SEND
VOL1
GND
VOL2
BEEP
FOG
FOGC to AF
EVCK unit J1
EVDATA
BPFV
WXDEC
SQL
DSDM
TXDET
DSD70
MICG MICG
DSCENC
MIC MIC
ICF3 ICF3
EXTRXD EXTRXD
EXTTXD EXTTXD
UNLK
PDATA
PSTB
PCK
EXTSTB
EXTOE
OPSTB
OPTIN
CP7
IC2
CP5
LM2904PWR
VCC
1 8
2 7
3 6
CP6
4 5
HV
IC8
TA78L05F
5.0V 13.8V
L5V HV
O I
G
D1 D5
KDS122 KDS122
Q4
KTC2875
ICF3
L5V
R89
47k
CP24
R84
1k
S5V S5V
Q7
2SC4081
R92
L5V
8
47
7 EXTTXD
6
R91
5 NMEAI
4.7k
Q8
2SA1576
Q9
2SK1069
EXTRXD
R95
1k
R93
820 EP81
R86
J5
12
NMEAI+
NMEAI-
to CHASSIS
NMEAO
unit W1
GND