Icom IC-2820H Service Manual page 43

SECTION 9 BLOCK DIAGRAM
• BLOCK DIAGRAM (Left side)
W50
NOISE
HV
FIL
IC55:ZXCT1022
D164:MA2S111
CURRENT
IDET
DETECT
IC21;TA7805F
5V NOISE
CPU5V
REG FIL
Q83;2SA1588
D119;MA2S111
5VS
5VS
REG
Q84;2SA1588
D120;MA2S111
5VS
L5V
REG
5V
Q81:2SB1132 IC24;TA7808F
VCC +8
8V
REG REG
VCC
Q82:
UNR9214J
PWR
CTRL
PWR
to CONTROL UNIT J4
VR1 UNIT
W1
1 1
2 2
LVOL LSQL,LVOL
3 3
/LSQL
4 4
5 5
to CONTROL UNIT J3
VR2 UNIT
W1
1 1
2 2
RVOL RSQL,RVOL
3 3
/RSQL
4 4
5 5
CONTROL UNIT +3.2V 5V
L_V/MHz Q31:2SC4738
L_M/CALL IC12:TC7S04F
R_M/CALL D8 - D11:1SS400
R_V/MHz
KEY PROTECT
SET AND
DUP BUFF
TONE
LOW
S5-8,S10-14
PWR_SW
S15
CPU_TXD
LDIAL_A
A CPU_RXD
LDIAL_B
B
COM
L_DIAL_SW
S16
RDIAL_A
A
RDIAL_B
B
COM
R_DIAL_SW
J4
1
2 LSQL,LVOL
to VR1 UNIT 3 CPU
4
5
IC13:
J3 M30620FCPGP
1
2 RSQL,RVOL
to VR2 UNIT 3
4
5 (12.288MHz)
+3.2V X1
Q14:2SC4738 CR-839
Q15:2SA1586
LCD_3V PWR
REG
IC14:TC7W04FU
LCD_3V VOLTAGE D20:MA8130
UP CON- D21:1SS372
VERTER D22:1SS372
D23:1SS372
D24:1SS372
LCD
MODULE
A_CS1,B_CS1 VOLTAGE
A0,D0-D5,D6(SCL) TRANS-
D7(SI),/RES,WR(R/W),RD(E) DUCER
IC10:
LM2904PWR
2820̲A3format.indd 10-11
All manuals and user guides at all-guides.com
RX line
TX line To the microphone
Common line
5VS
UATTC ATT UATT
CHASSIS UNIT CTRL
HV
MF1 Q14:2SC4738
D112:DAN222
L140_R5
FUN
FANC REG
CTRL R_BPF1 L220_R5 SEL
R_BPF2
Q21:2SC4738 R_BPF3
Q123:2SB1132 R_BPF4
D169:MA8075 PCON_U D113:DAN222
PCON_V L300_R5
PL_U REG
TX_MUTE L400_R5 SEL
5VS
DA_STB
DA_CK R_RX140 L5V 5VS
DA_DATA R_RX400
Q3 - Q11
D/A
UNR9114J
IC1:M62352GP
L5V L_RX140
DA3_STB L_RX220 REG
DA_CK L_RX300
DA_DATA L_RX400
VD5C
D/A
UD5C
IC54:M62352GP
L_BPF1
L_BPF2
L_BPF3 R_RX800
L_BPF4
L400_S
L5V
VATTC ATT VATT
CTRL
Q16:2SC4738
CPU5V
J5
TX232
RX232
LEVEL
RS-232C
CONV
IC46:
MAX3221IPWR
to MAIN UNIT to CONTROL UNIT
J3
J5 5V
1 1
2 2
3 3
4 4 LIMIT
TDATA
5 5
RDATA TXDATA
6 6
HV RDATA D165,D166,
CTHV D167,D168:
1SS400
TX_DATA
IC9:S-80945CNMC R_DATA
RESET
RESET
CPU5V
5V
5V
RESET
RESET
HV
+5 IC23:S-80945CNMC
REG
CPU5V
IC3;TA78L05F
SCL/SDA
+3.2V
EEPROM
+3
REG IC22:24LC512
+3.2V
IC6:R1111N321B R1,R2
D4:MA8039 R_UVCO_SEL,R_VVCO_SEL
L_LO_SW,R_DA_SEL
R_AFFILSEL,R_DET_MUTE
Q1:2SC4738 HV L_DA_SEL,L_DET_MUTE
Q3:2SB798
MATRIX
D12:MA8068
PWR D124 - D139:
DRIVER
MA2S111
CPU5V CL_SFT1/ CL_SFT2
X4
DS31-DS37:
CLOCK
FAMG1211F
SHIFT
LCD KEY
1/2
BACK BACK
LIGHT LIGHT D161:HVC376B CR-841
D162:HVC376B 19.6608MHz
DS21-29,
DS38,39:
SML-512MW
CURRENT
CONTROL
Q16-Q29:
2SC4738
9 - 1
5VS
J2
8V
1
2
Q87: IC28: IC30:
3
2SC4738 TA75S558F Q88:UNR9213J CD4066BPWR
4
5
MIC MIC MIC SENS MIC
6 HPF
AMP SELECT MUTE
7
8
5VS
D121: MA2S111
Q86:2SC4738
PTT PTT MIC_PTT MIC_SENS MM_MUTE
DETECT
L5V
98_DATA
LEVEL
L_VR5 MICIN
CONV
5VS
IC26:LMV321IDCK
D122:MA8047
PACKET
SQL
L_UR5 5VS
CONTROL
Q93:
J4
UNR9213J
PACKET
PTT
6 5 DETECT
D140:DA221 Q92:
4 3
UNR9113J
DATAIN
2 1 LIMIT
L140_R5
R140_R5
L220_R5 5VS
L300_R5
VD5
UD5
PACKET
R400_R5 AFOUT
AF
L400_R5
SELECT
R800_R5
Q95:UNR9213J
5VS IC35:CD4066BPWR
P_LR_SEL
PACKET
DATAOUT
DATA
SELECT
Q95:UNR9213J
IC35:CD4066BPWR
P_LR_SEL
Q102:2SC4213
SP
MUTE
L5V
J8 VCC IC38: IC36:
LA4445 SN74AHC1G08 L_AF_MUTE
AF AND R_AF_MUTE
AMP
SP SP
J9 MUTE MUTE
Q103:2SC4213 Q101:2SC4213
L5V
Q98:UNR9210J
SP1 D142:MA742
CLONE
MIC_PTT
98_DATA
DTCS
DTMF
CLONE_IN P_PTT
CLONE_OUT P_SQL
AF_VOL_RES
AF_VOL_DATA
CPU5V IDET R_RX800
AF_VOL_CK
AF_VOL_STB L5V
DTMSTB IC56:
DTMCK BU8872FS
DTMSD
DTMF
DEC
X6
CR-838
4.194304MHz
L_R5C
R_R5C
R_AMC
L_AMC
CPU
IC25:HD64F2506FC26
PLLCK
PLLDATA
L_PLLSTB
R_PLLSTB
DA_CK
DA_DATA
DA2_STB
L_WXALT
L_DTCS_IN
R_WXALT
R_DTCS_IN
L_RSLV
R_RSLV
L_SQL
R_SQL
5VS
8V
IC29: IC52: IC48 1/4,2/4: IC51:
TC7W53FU TC7W53FU LM2902PWR TC7W53FU
AF AF AF
HPF LPF
SW SW SW
IC48 4/4:
ALC Q99: LM2902PWR
AMP
IC32: UMG9N
AN6123MS Q100: DA_SEL
CUTOFF UNR9213J
SHIFT
DCONT DTCS
LPF
DA_SEL AN
DTCS_SEL
DTCS
P_SQL
DTMF
P_PTT
5VS 5VS
Q90:UNR9213J
IC30:CD4066BPWR
PACKET PACKET
MODE MOD
MUTE SELECT
L5V
IC31
CD4066BPWR IC34:
P_MOD_MUTE 1200_9600SEL TC7W53FU
VAFO
DIGITAL
DMOD
MOD SEL AMP
UAFO
MUTE
IC50:
LMV321IDCK
DADJMUTE
DADJSEL
L5V L5V
IC33:
SM6451B
ELEC.
AF
VR MIXER
IC59
TC4S66F
ANALOGSW
L5V
AF_VOL_RES
AF_VOL_DATA
BUFF
AF_VOL_CK
AF_VOL_STB
IC49:
LMV358IPW
DAFOUT
L5V
L5V L5V
DDETMUTE
DET
IC58: IC57:
TC7W53FU TC7W53FU CPU5V SELECT DDETSEL
VDET
DET DET IC37: L5V
SELECT SELECT UDET BTONE TC7W53FU
OP+5V
DVDTMFSEL DTMFSEL
VCC
OPTION
GPSBOOT
L5V 5VS GPSRESET UT-123 UNIT C5V
GPSOPT C5V
GPSRXD0
GPSTXD0
AMBECLK
AMBERES DAFOUT
L_R5
AMBESTB
R_R5
REG AMBEEPR
R_AM
AMBETXD
L_AM
AMBERXD
DCEL
RXDT/RXCK
Q43,Q44:UNR911NJ TXDT/TXCK
Q45,Q46:UNR9114J ACQ/DVC
L5V
IC60:
TC7W53FU
L_RSLV RSSI/LV
SELECT
VTX_C
5VS
IC61:
TC7W53FU
R_RSLV RSSI/LV
SELECT
UTX_C
A
AMOD
AMP
IC48 3/4:
LM2902PWR
B
VDET
C
UDET
D
VAFO
UAFO
E
Q94:2SA1362
Q118:UNR9213J
D5VC
REG
Q96:2SB798
Q97:2SC4738
D141:MA2S111
D5VC
REG
F
G
H
I
L_RSSI
L_LV
R_RSSI
R_LV
2007/04/02 9:09:06