Icom IC-7410 Service Manual - Page 18

Voltage Block Diagram, Front Cpu Display Board: Ic401 - pin diagram

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• FRONT CPU (DISPLAY BOARD: IC401) Pin Line No. Name Description I/O 1 CNT2V LCD contrast control. (segement area) (1-2.3 V) O 2 CNT1V LCD contrast control. (dot area) (1-2.3 V) O 10 FRES Front CPU Reset. L=Reset. I 19 RITDBK [RIT/ TX] dial phase-B. I 20 RITDAK [RIT/ TX] dial phase-A. I 21 MAINDAK [MAIN] dial phase-A. I 22 MAINDBK [MAIN] dial phase-B. I 23 TDS TX LED control. H=Lights. (While transmitting) O 24 BKLV LCD backlight control. (PWM) O 29 DTXD UART port (TX) O 30 DRXD UART port (RX) I 33 LTXD Data output (UART) for the communication with the main CPU. O 34 LRXD Data input (UART) for the communication with the main CPU. I 35 DOTK Ele-key input. (Dot) I 36 DSHK Ele-key input. (Dash) I 37 PHNK Headphones connection detect. H=Connected. I 38 NOTK [NOTCH] input. (Pull-up) I 40 LOCKK [LOCK] input. (Pull-up) I 43 PBCLK [PBT-CLK] input. (Pull-up) I 45 RITCLK [CLEAR] input. (Pull-up) I 46 DTXK [ TX] input. (Pull-up) I 47 FILK [FILTER] input. (Pull-up) I 48 XFCK [XFC] input. (Pull-up) I 49 MENUK [MENU] input. (Pull-up) I 50 RITK [RIT] input. (Pull-up) I 51 F5K [F-5] input. (Pull-up) I 52 F4K [F-4] input. (Pull-up) I 53 F3K [F-3] input. (Pull-up) I 54 F2K [F-2] input. (Pull-up) I 55 F1K [F-1] input. (Pull-up) I 56 NBK [NB] input. (Pull-up) I 57 NRK [NR] input. (Pull-up) I 58 ANTK [ANT] input. (Pull-up) I 59 TUNK [TUNER] input. (Pull-up) I 61 TRAK [TRANSMIT] input. (Pull-up) I 63- 70 LD7-LD0 LCD segment ports. O 83 PBT2BK [PBT] outer dial phase-B. I 84 PBT2AK [PBT] outer dial phase-A. I 85 PBT1BK [PBT] inner dial phase-B. I 86 PBT1AK [PBT] inner dial phase-A. I 88 PITCHL [CW PITCH] dial input. I 90 NRL [NR] dial input. I 91 NOTL [NOTCH] dial input. I 92 MUDL [MIC] Up/Down input. I 98- 100 ASL2- ASL0 Analog SW (CD4501) control. O 3-5 VOLTAGE BLOCK DIAGRAM DC-IN HV 13.8V H3.3V H3.3V FRONT "PWRK " FRONT REG CPU POWER SW "PWRS" H14V SW +5V +5V REG LOGIC CIRCUITS +1.2V DC-DC +3.3V +1.2V -8V +3.3V +3.3V +8V REG +5V REG DC-DC -8V +13.8V ANALOG CIRCUITS +8V +5V -12V 3 - 8

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3 - 8
Pin
No.
Line
Name
Description
I/O
1
CNT2V
LCD contrast control. (segement area)
(1–2.3 V)
O
2
CNT1V
LCD contrast control. (dot area)
(1–2.3 V)
O
10
FRES
Front CPU Reset.
L=Reset.
I
19
RITDBK
[RIT/
TX] dial phase-B.
I
20
RITDAK
[RIT/
TX] dial phase-A.
I
21
MAINDAK
[MAIN] dial phase-A.
I
22
MAINDBK
[MAIN] dial phase-B.
I
23
TDS
TX LED control.
H=Lights. (While transmitting)
O
24
BKLV
LCD backlight control. (PWM)
O
29
DTXD
UART port (TX)
O
30
DRXD
UART port (RX)
I
33
LTXD
Data output (UART) for the communication
with the main CPU.
O
34
LRXD
Data input (UART) for the communication with
the main CPU.
I
35
DOTK
Ele-key input. (Dot)
I
36
DSHK
Ele-key input. (Dash)
I
37
PHNK
Headphones connection detect.
H=Connected.
I
38
NOTK
[NOTCH] input. (Pull-up)
I
40
LOCKK
[LOCK] input. (Pull-up)
I
43
PBCLK
[PBT-CLK] input. (Pull-up)
I
45
RITCLK
[CLEAR] input. (Pull-up)
I
46
DTXK
[
TX] input. (Pull-up)
I
47
FILK
[FILTER] input. (Pull-up)
I
48
XFCK
[XFC] input. (Pull-up)
I
49
MENUK
[MENU] input. (Pull-up)
I
50
RITK
[RIT] input. (Pull-up)
I
51
F5K
[F-5] input. (Pull-up)
I
52
F4K
[F-4] input. (Pull-up)
I
53
F3K
[F-3] input. (Pull-up)
I
54
F2K
[F-2] input. (Pull-up)
I
55
F1K
[F-1] input. (Pull-up)
I
56
NBK
[NB] input. (Pull-up)
I
57
NRK
[NR] input. (Pull-up)
I
58
ANTK
[ANT] input. (Pull-up)
I
59
TUNK
[TUNER] input. (Pull-up)
I
61
TRAK
[TRANSMIT] input. (Pull-up)
I
63–
70
LD7–LD0
LCD segment ports.
O
83
PBT2BK
[PBT] outer dial
phase-B.
I
84
PBT2AK
[PBT] outer dial
phase-A.
I
85
PBT1BK
[PBT] inner dial
phase-B.
I
86
PBT1AK
[PBT] inner dial
phase-A.
I
88
PITCHL
[CW PITCH] dial input.
I
90
NRL
[NR] dial input.
I
91
NOTL
[NOTCH] dial input.
I
92
MUDL
[MIC] Up/Down input.
I
98–
100
ASL2–
ASL0
Analog SW (CD4501) control.
O
•
FRONT CPU (DISPLAY BOARD: IC401)
FRONT
POWER SW
DC-IN
13.8V
FRONT
CPU
DC-DC
+3.3V
+1.2V
–8V
+3.3V
+1.2V
+13.8V
LOGIC
CIRCUITS
+8V
REG
+5V
REG
H3.3V
REG
SW
+8V
DC-DC
–12V
+5V
H14V
H3.3V
ANALOG
CIRCUITS
+3.3V
“PWRK ”
HV
“PWRS”
–8V
+5V
REG
+5V
3-5 VOLTAGE BLOCK DIAGRAM