Icom ID-31A Service Manual page 6

GPS MODULE CONTROLLER
(IC1)
DATA LEVEL CONVERTER
(IC21)
EEPROM (For GPS data)
(IC3)
SERIAL DATA INTERFACE
(IC2)
+3.3 V REGULATOR
(IC9)
CPU RESET IC
(IC22)
AF FILTER
(IC12)
ALC IC
(IC14)
DUAL INVERTER GATE
(IC8)
AF SW
(IC16)
MIC GAIN SW
(Q18)
• LOGIC UNIT
(BOTTOM VIEW)
CLOCK OSCILLATOR (For the CPU)
(X2)
2 - 2
CPU
(IC5)
EEPROM (For the CPU)
(IC7)
CLOCK OSCILLATOR
(For the DSP)
DSP
(X3)
(IC18)
SERIAL FLASH MEMORY
(IC20)
CLOCK BUFFER
(For the CODEC)
(IC17)
CODEC
(IC15)
MicroSD CARD SLOT
(J3)
AF FILTER
(IC13)
DUAL STEP-DOWN COVERTER
(IC10)
REAL TIME CLOCK IC
(IC4)
CLOCK OSCILLATOR
(For the real time clock IC)
(X1)