Icom IC-2300H, Service Manual Addendum

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4 - 4
4-5 PORT ALLOCATIONS
• CPU (LOGIC UNIT: IC1)
• D/A CONVERTER (MAIN: IC5)
• SHIF REGISTER (MAIN: IC2)
Pin
No. Line
Name
Description I/O
1 MICSEL Microphone connection detect. I
3 TONE DTMF/BEEP/1750Hz tone signal. O
4 CTCOUT
Tone signal (CTCSS/DTCS) encoding
output.
O
10 RESET
CPU (LOGIC UNIT: IC1) reset signal.
H=The CPU is reset.
I
15 EXTSTB
Shift register (MAIN UNIT: IC2) serial
strobe.
O
16 DASTB
D/A converter (MAIN UNIT: IC5)
strobe.
O
17 DATA
Shift register (MAIN UNIT: IC2) serial
data.
O
18 EXTCK
Shift register (MAIN UNIT: IC2) serial
clock.
O
19 NOIS Noise level detect. I
20 CLIN Cloning data. I
21 CLOUT Cloning data. O
22 PWRSW
[ ] input.
L= Pushed.
I
23 OE
Shift register (MAIN UNIT: IC2) chip
enable.
O
24 PCON
Main power supply line control.
H=During the transceiver is ON.
O
25 UNLK
PLL unlock detect.
L=Unlocked.
I
26 PLLCK PLL IC (MAIN UNIT: IC1) serial clock. O
27 PLLDATA PLL IC (MAIN UNIT: IC1) serial data. O
28 PLLSTB PLL IC (MAIN UNIT: IC1) strobe. O
29
VOL-
DATA
Electronic volume (LOGIC UNIT: IC25)
serial data.
O
30 VOLCK
Electronic volume (LOGIC UNIT: IC25)
serial clock.
O
71,
72
KS1,
KS0
Key input ports.
I
76–
79
KR3–
KR0
I
80 LVIN Lock voltage input. I
81 HVIN Power source voltage. I
82 WX Weather alert signal. I
83 CTCIN
Tone signal (CTCSS/DTCS) decoding
input.
I
84 SQLV [SQL] input. I
85 VOLV [VOL] input. I
86 MICUD Up/down key on the microphone. I
87 SD
RSSI voltage from the IF IC (MAIN
UNIT: IC3).
I
88 TEMP Temperature sensing voltage. I
89 IDET
TX power AMP current fl ow sensing
voltage.
I
94 ESCK
EEPROM (LOGIC UNIT: IC5) serial
clock.
O
95 ESDA
EEPROM (LOGIC UNIT: IC5) serial
data.
I/O
97 DICK
Rotary encoder (LOGIC UNIT: S9)
pulse. (Phase A)
I
98 DIUD
Rotary encoder (LOGIC UNIT: S9)
pulse. (Phase B)
I
Pin
No. Line
Name
Description
6, 7 SQLIN Noise squelch level adjustment.
8 T3
Tuned BPF tracking voltage adjust-
ment.
11 T2_APC
RX: Tuned BPF tracking voltage ad-
justment.
TX: Transmit output power adjustment.
12 T1
Tuned BPF tracking voltage adjust-
ment.
19 FC Reference frequency adjustment.
20 REFMOD
Reference oscillator deviation adjust-
ment.
22, 23 MOD VCO deviation adjustment.
24 SQLATT Squelch attenuator level adjustment.
Pin
No. Line
Name
Description
5 PLLSW
PLL lockup time control.
H=Fast lockup mode.
6 TXMUTE
TX mute control.
L=Mute.
7 NWC
Narrow/Wide mode switching control.
H=Wide mode.
11 SHIFT
VCO switching control.
H= While receiving. (The RX VCO
(Q14, D10–D11, L6) is activated)
L= While transmitting. (The TX VCO
(Q13, D7–D9, L5) is activated)
12 T8C
Power supply line “T8C” control.
H=While transmitting.
13 RXC
Power supply line “R5V” control.
H=While receiving.
14 SPMUTE
Speaker mute control.
H=Mute.
Pin
No. Line
Name
Description I/O
99 PTT
[PTT] input.
H= Pushed.
I
100 REMO
Microphone connection detect.
H=Connected.
I