Voltage Block Diagram - Icom IC-7410 Service Manual

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

3-5 VOLTAGE BLOCK DIAGRAM

I/O
DC-IN HV
13.8V
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3 - 8
H3.3V H3.3V "PWRK "
FRONT
REG CPU
"PWRS"
H14V
SW
+5V
+5V
REG
+1.2V
+3.3V
DC-DC
+3.3V
+1.2V
–8V
+3.3V
–8V
+13.8V
+8V +8V
REG
+5V +5V
REG
–12V
DC-DC
FRONT
POWER SW
LOGIC
CIRCUITS
ANALOG
CIRCUITS