Icom IC-756PRO III Service Manual page 83

Q1208
2SC5551
A
IF
FI1701
AMP
Q1751 FL-381
3SK131 (64.455MHz)
XTAL
IF
B COMB
AMP BPF
(BW=15kHz)
Q1008
2SC5551
64.455MHz
C
IF
AMP
AGC
T8V
FI2002 FI2003 Q2201
D2101
SFECV13.35MAS SFECV13.35MAS 2SK882
HSB88WS
CERAMIC CERAMIC IF
ATT
BPF BPF AMP
ATT D2002
MA2S111
IC2001 TA31136FN IC2002B IC2002A
NJM4558M
NJM4558M
AGC
AGC
AMP
DET AMP
FI2001
CFJ455K8
CERAMIC
BPF
D
E
Q521 2SK508
F D521 KV1770S
D522 KV1770S
S3LO 12.79-12.99MHz
Q71 2SC4081
Q81 2SC4405
PSMT
X2
Q501 2SK508
Q802 IC801 Q801
D501 KV1770S
2SC4117 SC-1287 2SC4081
D502 KV1770S
BPF D/A DDS AMP
BUFF
PST7
Q551 2SK508
IC901
Q903 D551-D554
LC7153M
2SC4117 77.8MHz MA338?× 4
LOOP PLL
G BUFF HPF
FIL IC
Q902
2SK508
PSMT PST6
Q571 2SK508
D571-D574
IC902
MA338?× 4
TC7W08F
SW
DATA
IC701 Q701
SC-1287 2SC4081
H BPF D/A DDS AMP
8MHz
PST5
IC1
BU4094BCF
PSEL
SERI
PST1
PARA
PSTB
PST2
PST3
PST4
PST5
PST6
PST7
D1201 CPH5513
Q1201,Q1202
D1203 1SV263
Q1203-Q1206 2SK1740
D1204 CPH5513
2SK1740
PIN
RF LPF
ATT AMP
A
Q1207 D1205
2SC4081 MA2S111
SPLIT
DRIVER
BLAV
B
D1001 CPH5513
D1002 1SV263 Q1001,Q1002
Q1003-Q1006
D1003 CPH5513 2SK1740
2SK1740
PIN
RF
LPF
ATT AMP
Q1209
MMBFU310
AMP
Q4301,Q4303
Q1007 D1004
XP4311
2SC4081 MA2S111 PRE2
8V
DRIVER
DRIVER
BLBV
POFF
Q1551
D1451
2SK882
HSB88WS
64.455MHz
IF RF
LPF
LPF
AMP AMP
IC1401
µPC2708TB
ALC R8V T8V
T8V
Q2202 D2201 Q1301
2SC5551
2SK882 1SV263
IF PIN LO
LPF
AMP ATT AMP
SAGC
Q2203
2SC4081
SATV
DRIVER
LO
SCPL LPF
AMP
Q1101
Explanatory notes
2SC5551
VOLTAGE LINE
TX LINE
RX LINE
COMMON LINE
VCO-B
Q601
Q661
2SC4403
DTC114EE
BUFF
BPF MUTE
Q522 2SC4213
VCO
Q424
SW
Q651
UMD3N
DTA114EE
PBMT
BPF
PBFS
CTRL
PST4
D451
Q502 2SC4213
MA357
IC681 Q452 Q451
VCO
LMX2306TM 2SC4081 2SK210
SW
DATA
PLL LOOP
BUFF
IC FIL
Q402
IC401
2SC4081
SC-1246A
IC402
Q552 2SC4213
TC7S04F AMP
PHASE
VCO LOOP
DET
SW FIL
AMP
FI401
CFEC10,8MD11
CERAMIC
Q572 2SC4213
D/A DDS
BPF
VCO
SW
Q421,422,423,426
UMD3N
DDS
DRIVER
LPF 1/4
VB1S
VB2S
Q52
Q51
VB3S 2SC4081
2SC4403
Q403
VB4S
2SC4081
BUFF
X52 AMP
CR-338.
CAL
32.00056MHz
IC682 TA78L05F
+5
8V 5V PLLB
Q2 UMD3N REG
LEVEL
UNLC
CONV
Q4203,Q4204 PREAMP BOARD
XP4311
14V
DRIVER
PRE1 B0
0.03-1.6MHz
LPF ATT
Q4201
2SC5551
Q4202
BPF
2SC5551 1.6-2.0MHz
BOARD
BPF HPF
PRE
AMP
2.0-3.0MHz
Q4302
B1
BPF
2SC5551
PRE
B2
AMP
3.0-4.0MHz
BPF
B3
4.0-6.0MHz
BPF
B4
6.0-8.0MHz
ATT
BPF
B5
8.0-11.0MHz
BPF
T8V
B6
11.0-15.0MHz
BPF
B7
15.0-22.0MHz
BPF
B8
22.0-30.0MHz
TX-B10
BPF
B0-B10
B9
B10W
POFF
50.0-54.0MHz
PRE1
HPF
PRE2
B10
RANS
30-50MHz
ATT1
54-60MHz
ATT2
BPF
B10W
50.0-54.0MHz
BPF
TX-B10
MKRS
1LOA 64.485MHz-124.455MHz
VCO-A
BPF
Q201 2SK508
Q301
D201 KV1770S
2SC4403
D202 KV1770S
Q351
BUFF DTA114EE
Q202 2SC4213
DRIVER BPF
CTRL
VCO
PST2
SW
Q221 2SK508 IC381 Q152
D221,D222 KV1770S?× 2 LMX2306TM 2SC4081
DATA
PLL
BUFF
IC
Q222 2SC4213
VCO
SW
IC102
TC7S04F
Q251 2SK508
LOOP
D251-D254 MA338?× 4
FIL
AMP
Q252 2SC4213
FI101
VCO
CFEC10,8MD11
SW
CERAMIC
BPF
Q271 2SK508
D271-D274 MA338?× 4
Q121-Q123 UMD3N
Q126 UMD3N
Q272 2SC4213
VCO DRIVER
SW
VA1S
VA2S
VA3S
PST2 VA4S
IC382 TA78L05F
+5
8V
REG
RX ANT
LPF
RANS
ATT ATT
ANTS
12dB 6dB
RL101
RL103 RL102
D15
ATN203
ATN203 ATN203
HSM88AS
Q101
UNR9211J
ATT2 ATT1
D151 Q14,Q16 DTC114EU × 2
1SV307 Q13,Q17 DTA114EU × 2
TUNER
MUTE XVRT
ON/OFF
TRVI
CTRL
Q151 UMH11N
Q152 UNR9211J
MUTE
Q201 2SA1576
CTRL
Q202 UMH11N
Q203 UNR9211J
T8V
PAI
YGR
ATT LPF ATT
AMP
RX
IC201 LPF
µPC1678GV
D8,D9
HSM88AS × 2
IC401,IC402,IC403
CD4094BPWR?× 3
SERI
DRIVER MCK
D4
PARA
MDAT DWA010
IC301,IC302 BSTB
TD62783AF?× 2
Q351,Q352
UMH11N?× 2
D1,D2
Q353-Q357
HSM88AS × 2
XP4311?× 5
D301-D303,D351,D352
DAN222?× 5
RF-B UNIT
Q361
IC191
DTC114EE
TC7S08F
Q2
MUTE MUTE RD15HVF1
Q1 Q3
2SC1971 RD15HVF1
Q124
UMD3N PRE DRIVE
DRIVE AMP
PAMT
DRIVER
PAFS
Q151
2SK210 BIAS
D151
MA357
Q8
2SD1585K
LOOP
FIL
Q102
IC101
2SC4081
SC-1246A
Q10 2SC4081
AMP
Q11 2SC4081
PHASE
Q12 2SB1201
DET
Q13 2SB1201
D/A DDS MKRS
PST1
DULS HV
DDS
IC1
TA7805F
+5
H5V
Q103
REG
2SC4081
AMP 14V
IC2
TA7805S
+5
5V
REG
IC3
MC78T08C
+8
8V
REG
5V PLLA
CON0
CON1
PA UNIT
CON2
9 - 2
ANT2 ANT1
CHASSIS
TUNER-A UNIT
CURRENT
DET
TUNING
NET
Q12 DTC114EU
Q13 DTA114EU
TX/RX
CONRT
THRU
IC5
M38022M2-138FP X1 CR-569
6.144MHz
RESIST
DET
CPU
DATA
IC13
PHASE TA7805F
DET
+5
14V 5V
REG
SWR
FOR
DET
REF
CTRL-A UNIT
CTIN
Q4
RD100HHF1
Q5
RD100HHF1
1.8MHz
PWR
LPF
AMP
L1S
3.5MHz
LPF
BIAS
L2S
5/7MHz
LPF
FAN L3S
CTRL
10MHz
LPF
L4S
14MHz
LPF
L5S
18/21MHz
LPF
FUSE
L6S
(5A)
24/28MHz
LPF
L7S
50MHz
Q9 UNR9211J
D7 DAP222 LPF
L8S
RELAY
CTRL
COMMON
13.8V
FILTER
FILTER-A UNIT