Icom IC-M304 Service Manual page 6

SECTION 2
• MAIN UNIT
DSC DECODER
(IC3: NJM2211M)
IDC/LPF
(IC10: NJM4558M)
MIC MUTE SWITCH
(IC7: TC7W66EU)
2nd IF filter
(FI3: LT450EW)
• LOGIC UNIT
DIMMER CONTROL CIRCUIT
(Q2: KTA1664
Q3, Q4: KTC4075)
INSIDE VIEWS
IF IC
(IC1: TA31136FN)
CPU
(IC1: M37560EFGP)
2 - 1
TX POWER MODULE
(IC4: S-AV35A)
PLL IC
(IC8: uPD3140GS)
EEPROM
(IC4: HN58X2464T1)
TONE BUFFER
(IC6: NJM2904M)
VCO
1st IF filters
(FI1: FL-368,
FI2: FL-399A)