Icom IC-FR3000 Service Manual page 6

• LOGIC UNIT
Top view
CTCSS decoder
(IC29: FX805LG)
Splatter filter
(IC4: NJM2902V)
D/A converter
(IC25: M62364)
Mic mix amplifier
(IC2: NJM2902V)
AF amplifier
(IC17: LA4425A)
Mic amplifier
(IC1: NJM2902V)
Mic mute
(IC13: BU4066)
Bottom view
RESET
(IC34: S-80842C)
High-pass filter,
De-emphasis circuts
(IC9: NJM2902V)
2 - 2
Ringer detect circuit
(IC48: TLP121)
DTMF decoder
(IC30: TC4W53FU,
IC31: LC7387M)
EEPROM
(IC37: HN58X2464TI)
CPU
(IC33: HD64F2238BF)
Temperature switching
circuit (IC32: TC4W53)
LED current CTRL
(Q18, Q19, Q20: XP1114)
ON-HOOK signal output
(IC45: LM567M)
MIC amplifier, Limitter
(IC3: NJM2902V)