Explanatory Notes - Icom IC-R20 Service Manual

B_DET
A_DET
RESET
IC2: BD5228G
EEPROM
IC1: CAT24WC256
CIV-INTERFACE
IC4: TC7W04FU
Q3 : 2SA1586
Q6 : 2SC4116
INT/KEY
MATRIX
A DIAL
Q1 : 2SC4617
B DIAL
Q4 : 2SC4617
Q5 : 2SC4617
Q36: 2SC4617
DS1–DS11: SML-512MW
EP12: CV1081
LIGHT
BACKLIGHT CONTROL
REC UNIT
IC2:
M30620
SUBCPU MEMORY
IC6:
X1: CR-672
K9F5608U0C-YCB0
6.000 MHz
J2
USB
USB INTERFACE
IC3: FT245BM
MAIN CPU
IC3: M30620
CPU3V
X1: CR-717
9.8304 MHz
D14: HVC376B
IC5: TA31056F
Q7 : XP1501
Q8 : 2SA1588
Q9 : 2SB1132
J3
EXTSP
J8
D2 : MA2S728
D3 : 1SS400
INTSP
D5 : MA2S728
D6 : 1SS400
D7 : 1SS400
D8 : MA2S728
D9 : 1SS400
D10: 1SS400
D11: MA2S728
D12: 1SS400
16.384 MHz
X2: CR-708
REC IC
IC7: ML2302TB
AF IN/OUT
D0-D7
X2: CSBF453K
LCD DRIVE
BFO
BFO
CLOCK SHIFT
Q12: 2SC4617
IC7: SM6451B
AF
PRE
AMP
AMP
LOUT
PRE
AMP
ROUT
Q16: 2SC4617
+3S
CPU3
+3V
A_R3
+3
REG
Q10: 2SA1362
B_R3
+3
REG
Q15: 2SA1362
10 - 2
IC6: SN74AHC1CU04DBVR
X2: CSBFB453K
Q11: UNR9113J
D18: HN2V02H
BFOC
D22–25: 1SS372
Q28: 2SC4617
IC11: TC7W04FU
VP
DC-DC REG
B_CTONE
IC12: LM2904PWR
B_RTONE
TONE FIL
IC13: LM2904PWR
A_RTONE
TONE FIL
A_CTONE
LPF
AF FIL/AMP
Q23: 2SC4617
VR
Q25: XP6501
Q26: 2SJ144
Q19: 2SJ144
AF FIL/AMP
SW
Q22: 2SC4617
Q24: XP6501
Q27: 2SJ144
B AMUTE
Q13: XP6501
Q14: 2SA1588
+3
REG
+3
CHARGE CONTROL
REG
IC8: RN111N321B Q30: 2SB1201
Q31: HAT1023R
Q32: 2SC4617
Q33: 2SB1132
Q34: UNR9215J
Q35: UNR9213J
D28: MA2S111
+3
D29: SB07-03C
REG
D34: SB07-03C
D35: MA2S728
Q17: 2SA1588
D36: MA133
+3
REG
IC9: RN111N321B
LOGIC UNIT

Explanatory notes

VOLTAGE LINE
RX LINE
B_DET
A_DET
B_DET
LPF
B_DET
A_DET
A_DET
A_DET
B_DET
Li+
EXTDC
CHGC
CHGS
RECORDING LINE
PLAYBACK LINE