Icom IC-2820H Service Manual page 44

• BLOCK DIAGRAM (Right side)
8V
L_LV
Q119:
2SK1069
PLLCK
PLLDATA
A L_PLLSTB
X5:CR-833
L5V TCXO
Q105:
2SC4738
R_LV
PLLCK
PLLDATA
R_PLLSTB
5VS
IC9: IC63:
TC7S66FU TC7S66FU
MOD MOD
SELECT SELECT
MOD_DA MODSEL
AMP
IC53:
LMV321IDCK
D/A
DA_CK IC8:
DA_DATA M62363FP
DA2_STB
B
VDET
C
UDET
VAFO
D
VAFO
UAFO
E
UAFO
F
DAFOUT
G
H
I
2820̲A3format.indd 12-13
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IC42:TC7S66FU Q58:
Q121:UNR9213J 2SC4738
FILTER L_PLLSW L_VCO8 VT8
BUFF
SW REG L5V
L5V
L_VCO8
Q113:
2SC5231
PLL LOOP
BUFF AMP
IC FIL
D143 D151:MA2S077
MA2S111
IC41: – Q111:2SC5231 IC44:
135.575
MB15A02PFV D145:HVC321B UPC2709TB
255.575 MHz
D146:HVC321B
12.8MHz 8V D147:HVC321B
D152:MA2S077
BUFF
Q112:
2SC5108 Q110:UNR921NJ
Q104: D148:MA2S077
UNR911NJ
L_VCO8
SHIFT
X3 L5V L_UR5
X3
REG
Q109:
UNR9213J
L_R5C L_VCO_SHIFT
MUTE VMMUTE
L_VR5
8V
IC17:TC7S66FU Q65:XP4601
Q120: Q122:UNR9213J Q68:XP4601 REG
2SK1069 R_PLLSW R_VVCO_SEL
FILTER VCO Q115:
R_UVCO_SEL
SW SELECT UNR9213J
BUFF
L_LO_SW
5VS
164.350–
220.350 MHz
PLL LOOP VCO
BUFF
IC FIL SW
Q72:2SC5231
D81: Q74:
D89:HVC362
MA2S111 Q61:2SA1586 2SC5231 D160:MA2S077
D90:HVC362
IC14: Q62:2SC4116 –
353.65
MB15A02PFV D86:DA221
523.170 MHz
UMMUTE
VCO
BUFF
SW
Q76:
R_VCO_MOD MUTE 2SC5231 D102:MA2S077
Q73:2SC5231 D97:
15.3MHz D91:HVC375B MA2S111 8V
X1:CR-783 Q64: D92:HVC350B
UNR9213J D87:HVC321B
TCXO
BUFF
Q60:
2SC5108
5VS
L_WXALT WXALT
R_R5 FIL
5VS
Q41:
X3
XP4601
L_WN_SEL
Q52:2SC4738 L_DTCS_IN CTCSS
FIL L_AM L_R5
L5V
Q55,57:
8V L_AFFILSEL 5VS XP6501
IC11: IC13:
Q47:XP6501 TC7W53FU TC7W53FU AM
Q50:UNR9213J L_DET_MUTE DET
AF DIGI/AN DET OUT
FIL L_DA_SEL SELECT SELECT
VDET
L_RSSI
L_2ndLO
R_WXALT WXALT
FIL
5VS
Q42:
XP4601
R_DTCS_IN CTCSS R_WN_SEL
FIL
R_AM R_R5
UDET 5VS
Q63,67:
8V R_AFFILSEL 5VS XP6501
IC12:
Q48:XP6501 TC7W53FU IC16: AM
Q49:UNR9213J R_DET_MUTE DET
AF DIGI/AN DET OUT
FIL R_DA_SEL SELECT SELECT
TC7W53FU
Q15:2SA1362
Q12:UNR9213J
8V
VT8
D155:1SV308 VTX_C REG
D157:1SV308
136.000–174.000MHz
LO SW
LPF ATT
141.150–221.145MHz
D153:MA2S077 8V
Q17:2SA1362
LO SW LO SW Q13:UNR9213J
LPF
UTX_C UT8
REG
271.150–511.150MHz
D154:MA2S077
LO SW LO SW
HPF LPF HPF
79.150–121.150MHz
D150: L_UR5
MA2S077 IC43:UPB1509GV Q116:
2SC5108
Pre
LO SW LO SW
ATT SCALER BUFF LPF
D156:
MA2S077
ATT
L5V UT8 D103:
400.000–469.995MHz
REG 1SV308
Q106: LO SW UHFYGR
HPF HPF
UNR911NJ
5VS R140_R5 D159: R140_R5
164.350–220.350MHz
MA2S077
LO SW
LPF
AMP
IC45: [USA]
856.350–1046.340MHz
UPC2709TB D101: IC62: [others]
763.650–953.640MHz
MA2S077 UPC2709TB
R800_R5 LO SW
HPF LPF
AMP
SW
353.650–503.650MHz
D109:MA2S111 D104:MA2S077 D108:MA2S077
LO SW RF
LPF
MUTE
Q79:UNR9213J
450kHz
FI2: FI1: R400_R5 R400_R5
LT450EW LT450HW
CERAMIC CERAMIC
Q59:UNR9213J
BPF BPF Q53:UNR9113J L_R5
Q54:UNR9210J
Q56:UNR9113J
D82:MA2S111
D83:MA2S111 D88:
D84:MA2S111 DA221 38.85MHz
WIDE/NARROW
D85:MA2S111
SELECTOR
IF XTAL
LIMIT
X2 AMP BPF
JTB450C24
Q66:
FI5:
2SC4406
FL-408
IF IC IC15:
TA31136FN
L_SQL
38.4MHz
450kHz
FI4: FI3:
LT450EW LT450HW
R_R5
CERAMIC CERAMIC
D93:MA2S11
BPF BPF
D94:MA2S11
D95:MA2S11
D96:MA2S11
Q69:UNR9113J
Q70:UNR9210J
WIDE/NARROW Q71:UNR9113J D100:
SELECTOR Q117:UNR9213J DA221 46.35MHz
XTAL
X3 IF
LIMIT
JTB450C24 AMP BPF
Q75: FI6:
2SC4406 FL-409
IF IC
IC18:
TA31136FN
R_2ndLO 45.9MHz
R_SQL
R_RSSI
VU1
UAGC UU1
VU2
AGC
VV
VAGC UV
V220
D1–D 6:
MA2S728
HV
VT8
Q25 D29 Q27 IC3 D47:MA742
2SC3357 MA2S111 2SC4703 S-AV32 D39:MA742
PRE PWR
DRIVE
LIMITER LPF
DRIVE AMP AMP
HV
UT8
Q22 D25 Q26 IC2
2SC5085 MA2S111 2SC3357 S-AU82L
PRE DRIVE PWR
LIMITER LPF
DRIVE
AMP AMP
8V IC4:NJM3404AV
Q31:UNR9113J
Q36:UNR9113J
L_RXLO
APC
CTRL
TX_MUTE TX_MUTE
L140_R5 PCON_U PCON_V
D41:HVC350B VV D55:HVC350B
D44:HVC350B D60:HVC350B
VVIF RX RF
BPF BPF
SW AMP
D38:MA2S077 Q33:3SK318
D107: L_BPF4 L_BPF3 L_BPF2
MA2S077 R140_R5
LO SW R_Lo D40:HVC350B UV D54:HVC350B
D43:HVC350B D58:HVC350B
UUIF RX RF
BPF BPF
SW AMP
D106:MA2S077
D35:MA2S077 Q32:3SK318
LO SW
R_BPF4 R_BPF3 R_BPF2
118–174MHz
LO SW
R400_R5
D10:1SV308 D18:1SV308
D16:1SV308 UU1 D26:1SV308
D12:HVC375B D20:HVC375B
D14:HVC375B D23:HVC375B
IC19:
SPM5001 UUIF RX RF
BPF BPF
VVIF SW AMP
D7:MA2S077 Q19:3SK324
Q2:XP4601 R_BPF3 R_BPF1
L_RXLO R_BPF4 R_BPF2
375–550 MHz
5V SHIFT SHIFT
CTRL
L400_R5
R400_S
D19:1SV308
D11:1SV308
VU2 D27:1SV308
D17:1SV308
D13:HVC375B D21:HVC375B
D15:HVC375B D24:HVC375B
RX RF
VVIF
BPF BPF
SW AMP
D8:MA2S077 Q20:3SK324
Q1:XP4601 L_BPF3 L_BPF1
375–550 MHz
L_BPF4 L_BPF2
5V SHIFT
IC20: CTRL SHIFT
SPM5001
UUIF D36:MA2S077 D45:HVC350B
L400_S
VVIF RX
ATT
SW
R_Lo
L220_R5 L_BPF4
D37:MA2S077 D46:HVC375B
RX
VVIF
ATT
SW
R800_R5 L300_R5 L_BPF4
UUIF RX RF
ATT
SW AMP
D9:MA2S077 Q18:2SC5231
9 - 2
ANT-1
(CHASSIS; J1)
D59:L709CE
D75:L709CE
D77:MA2S077
SWR TX/RX
LPF LPF
DET SW
D53:MA2S077
D42:MA742 D61:L709CE
D52:MA742 D62:L709CE
SWR TX/RX
HPF
DET SW
118–174MHz
L5V RL2:ATQ206SA
Q38:2SC4738
D68:1SV172 D76:MA2S111
RX
ATT
SW L_R5
D78:MA2S111
D79:MA2S111
L_BPF1 VATT VD5 RF
LIMITER
AMP
Q37:3SK318
D70:1SV172
ATT
ANT-2
(CHASSIS; J2)
R_BPF1 UATT
D64,D67: D65,D71:MA2S077
Q39:3SK318 MA2S111 D72:1SV308
RF ANT
LIMITER LPF LPF
AMP SW
VD5 UD5
D63,D66: D69,D73:MA2S077
Q29:3SK324 MA2S111 D74:1SV308
RF ANT
LIMITER HPF
AMP SW
UD5
VD5
D30:1SV172
ATT
UATT
R_R5
D48,D49:
MA2S111
RF
LIMITER
AMP
Q28:3SK324
5VS
D28:1SV172
RX
ATT
SW
RL1:ATQ206SA
Q30:2SC4738
VATT UD5 D32:MA2S111
V220 L220_R5 174–260 MHz
D51:HVC350B D56:MA2S077
RF RX 5VS
BPF BPF
AMP SW
Q34:2SC5624
L_BPF3 L220_R5 RX
VU1 L300_R5 SW
D50:HVC375B D57:MA2S077 RL3:ATQ206SA
Q40:2SC4738
RF RX
D80:MA2S111
BPF BPF
AMP SW
260–375 MHz
Q35:2SC5624
L_BPF3 L300_R5
810–1000 MHz
RF RX
HPF ATT HPF
AMP SW
Q23:2SC5624 D22:1SV308
2007/04/02 9:09:06