Port Allocations - Icom IC-E7 Service Manual

4-4 PORT ALLOCATIONS

4-4-1 CPU (MAIN UNIT; IC4)
Pin Port
No. Name
2 K2 Input port for [Y], [Z]keys.
3 K1 Input port for [BAND], [CALL] and [V/M] keys.
Input port for RSSI signal for the S-meter
4 RSSI
indicator from FM IF IC (IC15, pin 12).
Input port for volatage detection of attached
5 VIN
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.
Input port for [PWR] key (S6).
25 POWER
LOW: When the key is pushed.
Outputs strobe signal to the D/A converter
26 DSTB
(IC13, pin 8).
O u t p u t s c l o ck s i f t s i g n a l t o t h e c l o ck
28 CLS
frequency shift circuit (Q5).
Outputs VOL strobe signal to the electronic
29 VSTB
VR (IC7, pin 14).
Outputs serial data to the PLL IC (IC18, pin 13),
32 PDA electronic VR (IC7, pin 16) and D/A converter
(IC13, pin 6).
Outputs PLL strobe signal to the PLL IC
33 PSTB
(IC18, pin14).
Outputs serial clock signal to the PLL IC
34 PCK (IC18, pin 12), electronic VR (IC7, pin 15) and
D/A converter (IC13, pin 7).
Inputs PLL unlock signal ("PUL") from PLL IC
35 PUL
(IC18, pin15).
Outputs TX indicator LED (DS8; Red) control
41 LEDR signal to the LED driver (Q49).
"High": While transmitting.
Outputs RX indicator LED (DS8; Green)
42 LEDG control signal to the LED driver (Q49).
"High": While receiving.
Outputs UHF RF circuit control signal to the
43 UHFC band selector (Q36).
"High": While receiving on the UHF band.
Outputs receive circuit control signal to R3V
44 R3C regulator (Q6).
"High": While receiving.
Outputs receiving mode (FM/WFM) switching
signal to the FM/WFM switches (Q16, Q17,
45 WFM
Q51, Q52).
"Low": While receiving in FM mode.
Outputs receiving mode (AM/FM) switching
signal to the AM demodulator switch (Q18)
46 AM
and AF switch (IC14).
"High": While receiving in AM mode.
Inputs "NOISE" signal from the FM IF IC
47 NOISE
(IC15, pin 13).
Outputs DTCS filter control signal to the
48 DTCS
DTCS fi lter (Q41).
Outputs tone fi lter control (IC5) signal to the
49 TCON
CTCSS fi lter switch (Q8).
Description
Pin Port
No. Name
Outputs VHF RF circuit control signal to the
band selector (Q36).
51 VHFC
"High": While receiving on the VHF band
Outputs +3V line control signal to the +3V
52 PCON regulator (IC10).
"High": While the transceiver's power is ON.
Outputs +3S line control signal to the +3S
53 +3SC
regulator (Q3, Q4).
Outputs transmit circuits control signal to T3
54 TXC regulator circuit (Q24–Q27).
"High": While transmitting.
• While receiving, outputs beep sound to the
electric volume (IC7, pin6).
55 BEEP
• While transmitting, outputs 1750 Hz tone signal
to the microphone amplifi er circuit (IC8, pin 9).
Outputs UHF TX circuit control signal to TX
56 TXU band switch (Q27).
"High": While transmitting on UHF band.
Outputs VHF TX circuits control signal to TX
57 TXV band switch (Q27).
"High": While transmitting on VHF band.
Outputs oscilating frequency shift circuit
(VCO BOARD; Q5, D2–D4) control signal.
58 VSHIFT
"High": D2–D4 are ON, and the oscillating
Outputs doubler switches (VCO BOARD;
59 DBL2 D13, D17) control signal.
"High":While receiving 500 MHz and below.
Outputs doubler switches (VCO BOARD;
60 DBL1 D12, D16) control signal.
"Low":While receiving 500 MHz and above.
Outputs attenuator control signal to the
61 ATT attenuator controller (Q40).
"High":While attenuator is activated.
Outputs HF RF circuit control signal to the
63 HFC
HF band selector (Q35).
Outputs 0.5–30MHz receive circuit control
64 BCC
signal to the HF band selector (Q35).
Outputs 430 MHz VCO control signal to the
65 V3C
430 MHz VCO switch (VCO BOARD; Q3).
Outputs 144 MHz VCO control signal to the
66 V2C
144 MHz VCO switch (VCO BOARD; Q3).
Outputs 50 MHz VCO control signal to the
67 V1C
50 MHz VCO switch (VCO BOARD; Q4).
Outputs AF power amplifi er (IC9) control signal
68 AFON to the AF power amplifi er controller (Q46, Q47).
"High": While the audio is emitted.
Outputs backlight control signal to the LCD
69 LIGHT backlight (PA BOARD; DS1) driver (Q22).
"High": While the backlight is ON.
Outputs MIC line mute signal to the MIC
70 MMUTE mute switch (Q37).
"High": MIC signal is muted.
Outputs 500
71 800C
signal to the 800 MHz band selector (Q40).
73, DUD,
Input ports for [DIAL].
74 DCK
4 - 5
Description
(76−300 MHz).
frequency is shifts down.
– 999 MHz RF circuit control