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Pin
No.
Port
Name
Description
2 K2 Input port for [Y], [Z]keys.
3 K1 Input port for [BAND], [CALL] and [V/M] keys.
4 RSSI
Input port for RSSI signal for the S-meter
indicator from FM IF IC (IC15, pin 12).
5 VIN
Input port for volatage detection of attached
battery pack.
6 CTONE Input port for WX signal.
7 RTONE Input port for CTCSS/DTCS signal.
14 ESIO I/O port for EEPROM (IC1) data.
15 ECK I/O port for the EEPROM (IC1) clock.
25 POWER
Input port for [PWR] key (S6).
LOW: When the key is pushed.
26 DSTB
Outputs strobe signal to the D/A converter
(IC13, pin 8).
28 CLS
Outputs clock sift signal to the clock
frequency shift circuit (Q5).
29 VSTB
Outputs VOL strobe signal to the electronic
VR (IC7, pin 14).
32 PDA
Outputs serial data to the PLL IC (IC18, pin 13),
electronic VR (IC7, pin 16) and D/A converter
(IC13, pin 6).
33 PSTB
Outputs PLL strobe signal to the PLL IC
(IC18, pin14).
34 PCK
Outputs serial clock signal to the PLL IC
(IC18, pin 12), electronic VR (IC7, pin 15) and
D/A converter (IC13, pin 7).
35 PUL
Inputs PLL unlock signal ("PUL") from PLL IC
(IC18, pin15).
41 LEDR
Outputs TX indicator LED (DS8; Red) control
signal to the LED driver (Q49).
"High": While transmitting.
42 LEDG
Outputs RX indicator LED (DS8; Green)
control signal to the LED driver (Q49).
"High": While receiving.
43 UHFC
Outputs UHF RF circuit control signal to the
band selector (Q36).
"High": While receiving on the UHF band.
44 R3C
Outputs receive circuit control signal to R3V
regulator (Q6).
"High": While receiving.
45 WFM
Outputs receiving mode (FM/WFM) switching
signal to the FM/WFM switches (Q16, Q17,
Q51, Q52).
"Low": While receiving in FM mode.
46 AM
Outputs receiving mode (AM/FM) switching
signal to the AM demodulator switch (Q18)
and AF switch (IC14).
"High": While receiving in AM mode.
47 NOISE
Inputs "NOISE" signal from the FM IF IC
(IC15, pin 13).
48 DTCS
Outputs DTCS filter control signal to the
DTCS fi lter (Q41).
49 TCON
Outputs tone fi lter control (IC5) signal to the
CTCSS fi lter switch (Q8).
Pin
No.
Port
Name
Description
51 VHFC
Outputs VHF RF circuit control signal to the
band selector (Q36).
"High": While receiving on the VHF band
(76−300 MHz).
52 PCON
Outputs +3V line control signal to the +3V
regulator (IC10).
"High": While the transceiver's power is ON.
53 +3SC
Outputs +3S line control signal to the +3S
regulator (Q3, Q4).
54 TXC
Outputs transmit circuits control signal to T3
regulator circuit (Q24–Q27).
"High": While transmitting.
55 BEEP
• While receiving, outputs beep sound to the
electric volume (IC7, pin6).
• While transmitting, outputs 1750 Hz tone signal
to the microphone amplifi er circuit (IC8, pin 9).
56 TXU
Outputs UHF TX circuit control signal to TX
band switch (Q27).
"High": While transmitting on UHF band.
57 TXV
Outputs VHF TX circuits control signal to TX
band switch (Q27).
"High": While transmitting on VHF band.
58 VSHIFT
Outputs oscilating frequency shift circuit
(VCO BOARD; Q5, D2–D4) control signal.
"High": D2–D4 are ON, and the oscillating
frequency is shifts down.
59 DBL2
Outputs doubler switches (VCO BOARD;
D13, D17) control signal.
"High":While receiving 500 MHz and below.
60 DBL1
Outputs doubler switches (VCO BOARD;
D12, D16) control signal.
"Low":While receiving 500 MHz and above.
61 ATT
Outputs attenuator control signal to the
attenuator controller (Q40).
"High":While attenuator is activated.
63 HFC
Outputs HF RF circuit control signal to the
HF band selector (Q35).
64 BCC
Outputs 0.5–30MHz receive circuit control
signal to the HF band selector (Q35).
65 V3C
Outputs 430 MHz VCO control signal to the
430 MHz VCO switch (VCO BOARD; Q3).
66 V2C
Outputs 144 MHz VCO control signal to the
144 MHz VCO switch (VCO BOARD; Q3).
67 V1C
Outputs 50 MHz VCO control signal to the
50 MHz VCO switch (VCO BOARD; Q4).
68 AFON
Outputs AF power amplifi er (IC9) control signal
to the AF power amplifi er controller (Q46, Q47).
"High": While the audio is emitted.
69 LIGHT
Outputs backlight control signal to the LCD
backlight (PA BOARD; DS1) driver (Q22).
"High": While the backlight is ON.
70 MMUTE
Outputs MIC line mute signal to the MIC
mute switch (Q37).
"High": MIC signal is muted.
71 800C
Outputs 500
–999 MHz RF circuit control
signal to the 800 MHz band selector (Q40).
73,
74
DUD,
DCK
Input ports for [DIAL].
4-4 PORT ALLOCATIONS
4-4-1 CPU (MAIN UNIT; IC4)