Icom IC-R20 Service Manual - Page 57

LOGIC and REC unit, MAIN CPU

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

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