Icom iF110 Service Manual

Also see for IC-F121: Price list Instruction manual Instruction manual

Contents

Icom iF110 Service Manual Manual pdf 10 page image

4 - 4DescriptionThe voltage from a DC power supply.The same voltage as the HV line which is con-trolled by the power switching circuit (Q23, Q24).When the [POWER] switch is pushed, the CPUoutputs the “PWON” control signal to the powerswitching circuit to turn the circuit ON.Common 5 V for the CPU converted from the HVline by the CPU5V regulator circuit (IC10). Thecircuit outputs the voltage regardless of thepower ON/OFF condition.Common 8 V converted from the VCC line by the8V regulator circuit (IC9).Common 5 V converted from the 8 V and CPU5lines by the 5V regulator circuit (Q27, Q28).Receive 8 V controlled by the R8 regulator circuit(Q26, Q30) using the “RXC” signal from theexpander IC (IC17, pin 4).Transmit 8 V controlled by the T8 regulator circuit(Q25, Q29, D23) using the “TMUT” signal fromthe expander IC (IC17, pin 13).LineHVVCCCPU5V8V5VR8VT8VInput port for the internal temperature.Input port for the low voltage detectionfrom the connected power supply.Input port for reset signal.Output ports for 5/2 tone and DTMFsignals.Outputs the CPU clock shift signal.Outputs cut-off frequency control signalto the low-pass filter (MAIN unit; IC5)for CTCSS/DTCS switching.Input port for the key matrix.Output ports for 5/2 tone and DTMFsignals.Input port for the PLL unlock signalfrom the PLL IC (MAIN unit; IC4).Input port for the key matrix.Output ports for CTCSS/DTCS signals.Input ports for the key matrix.Outputs the clock signal to the PLL IC(MAIN unit; IC4), D/A converter (MAINunit; IC6), LED driver (IC4) and option-al board (connect to MAIN unit; J1).Outputs the data signal to the PLL IC(MAIN unit; IC4), D/A converter (MAINunit; IC6) and optional board (connectto MAIN unit; J1).Output port for beep sound signal.I/O port for the data signal for the EEP-ROM (IC3)Outputs the clock signal for the EEP-ROM (IC3).Outputs the clock signal for the LCDdriver (IC6, pin 17).Outputs the data signal for the LCD dri-ver (IC6, pin 48).Outputs the strobe signal for the PLLIC (MAIN unit; IC4).Outputs the strobe signal for the D/Aconverter IC (MAIN unit; IC6).Outputs the strobe signal for theexpander IC (IC17).Outputs the control signal for the LCDdriver IC (IC6).Outputs the control signal for the powerswitching circuit (MAIN unit; Q24,Q23).12713–14151617, 1819–20212223–2526, 27282930313233343637383941TEMPBATVRESSENC0–SENC1CSFTDUSEKS0, KS1SENC2–SENC3UNLKKR0CENO0–CENO2KR1, KR2SCKSOBEEPESDAESCLLSCKLSOPLSTDASTEXSTEXOEPWONPin Port Descriptionnumber name4-4 POWER SUPPLY CIRCUITS4-4-1 VOLTAGE LINES (MAIN UNIT)4-5 PORT ALLOCATIONS4-5-1 CPU (FRONT UNIT; IC1)