Icom IC-Q7A Service Manual page 11

4-5 PORT ALLOCATIONS
4-5-1 CPU (LOGIC UNIT IC11)
Output control signal for the doubler
circuit.
Outputs MIC mute control singal.
Input port for [LOCK], [BAND], [VMC]
K2 switches.
Input port for [FUNC] switch and
[DIAL].
Output AF mute switch (LOGIC unit;
Q37) control signal.
Low : While squelched.
Input port for the low battery detection.
Input port for the RSSI signal from the
FM IF IC (RF unit; ІС2, рт 12) to
detect receiving signal strength.
Input port for CTCSS decoded signal.
Outputs CTCSS, and T-CALL signal
while transmitting, and control signal
TSTCTU|tor VHF/UHF tunable BPF while
receiving.
Description
Outputs T3V and VHT2V regulators
control signal.
Low : Transimit оп VHF.
Outputs +3S regulator control singal.
Outputs +3V regulator control signal.
Outputs LCD backlight control signal.
High : Lights ON.
Outputs T3V and UHT2V regulators
control signal.
Outputs BUSY LED control signal.
High : The BUSY LED is ON.
Input port for the [PTT] switch.
High : While [PTT] switch is pushed.
Input port for the RESET signal.
Outputs data signals to the EEPROM
IC (LOGIC unit; ІС2).
4
Outputs clock signal to both PLL IC
(RF unit; IC3) and EEPROM IC.
2
43 ECK/I3 | Outputs clock signal to EEPROM IC.
10 FSET | Output signal to adjust the RIT.
Outputs control signal for the CTCSS
12 SQL | Pulse signal input port for the squelch.
44, 45 12, 11 Input ports for Initial matrix.
46 PSTB/IO | Outputs strobe signals for the PLL IC.
Outputs data signals to the PLL IC.
Input port for the [FUNC] switch.
Low :While [FUNC] switch
pushed.
Input port for the [SQL] switch.
Low :While [SQL] switch is pushed.
is
Output signal to adjust the TX modula-
tion level and RX volume level.
input port for clock signal from the
[DIAL].
Outputs AM mode select signal.
Low :When AM mode is selected.
Outputs WFM mode select signal.
Low :When WFM mode is selected.
PDA/UL
47
48
Input port for PLL unlock signal from
PLL IC (RF unit; IC3).
Output control signal for the doubler
circuit.
Outputs band pass filter select signal.
Low :When frequencies 30.0 to
118.0 MHz or 175.0 to 330
MHz are displayed.
Output band pass filter select signal.
Low :When frequencies 1027 to
1300 MHz are displayed.
Output band pass filter select signal.
Low :When frequencies 470 to
1027 MHz are displayed.
Outputs beep audio signals.
Input port for the UP/DOWN signal
from the [DIAL].
Input port for the [POWER] switch.
Low :While [POWER] switch
pushed.
is
Outputs contro! signal for the AF
amplifier requlator circuit.
High : Activates the AF amplifier cir-
cuit.
Outputs R3V regulator control signal
while receiving.
Output band pass filter select signal.
Low : When frequencies 330 to 470
MHz are displayed.
Output band pass filter select signal.
Low :When frequencies 118 to 175
MHz are displayed.
Outputs shift signal for the VCO shift
switch (RF unit; Q29).
High : Shift ON (380—550 MHz).
Low :Shift OFF (274-380 MHz).
Outputs control signal for the 1st VCO
circuit.