Icom IC-T70A Service Manual page 38

MAIN UNIT (3/4)
5.00V
R302
3.3k
4.16V
R308
VVCO_SEL
3 4
8.2k
4.11V
2
8.2k
UVCO_SEL
1 5
R300
VCO SW
R310
3.3k
4.30V
VCOMOD
VCOMOD
3.61V
C300
REFMOD
1
C301
C311
1
0.001
CR-875
VCC OUT
4 3
R301 R307
REFCON
VCON GND
1 2
2.2M 0
X300
1.50V 4.58V
(LOCK)
TXMUTE
UHFC
VHFC
VCO_SHIFT
VCO_MUTE
PLLSW
PPS
PLLSTB
PLLDATA
PLLCK
UNLOCK
BPF1
BPF2
BPF3
T5
VCC- I
R5
5VS
RX AF
TTEMP
SD MUTE SW
NOIS
I C904
1 5
2
3 4
TC7S66FU
DETMUTE
SQLSW
WN
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R335 10k
Q306
LDTC144EE
100
3.92V
R325
(145MHz)
R328 R339
R326 L302
0.18U
1.5k 1.2k 1.2k
1k
R345
R340
8.2k
R327 0
Q307
LDTC144EE
PLL IC
I C305
R319
1 16
OSCI R
2 15
1k OSCO P
3 14 Mod.
VP L/F
4 13
VCC ZC
5 12 MUTE
DO PS
6 11
GND LE
7 10
XFIN DAT
8 9
FIN CLK
M B15E03SLPFV1
C316
47P
D301 R334
L1SS400
10k
R347
100
4.67V
4P C338
C347
3P
LTWC450E1
Q305
2SC4738
0.62V
C346
470P
R350
1k
10 - 3
3.50V
2.78V
C367
L305
0.75V
18N 47P
100P R376
C383 330
Q310
2SC5108
VHF VCO
0.82V(SHIFT ON)
3.42V(SHIFT OFF)
3.00V
HVC365
C368
2.80V
D305 15P
4.00V
Q311
R352
0.1
100k C366
2SC5231A
4.7k C386
1P R375
R360
120
Q314
Q308 0.73V 2SC5231A
LDTC114YE
2.60V
0.02V(SHIFT ON)
4.14V(SHIFT OFF)
SHIFT SW
3.90V 3.44V
C348
0.01
2.98V
0.3P
C358 C371
0.3P 6P
C362
Q312
2SC5231A
Q 313
C390
0.5P 2SC5008
L304
0.18U
1.40V 0.80V
(435MHz)
2.31V
UHF VCO
4.95V
R357
1.5k
FI300
O I
IC313
I
1 16
OSCIN MIXIN
2
15 R330
OSCOUT GND
3 14
1.8k
MIXOUT NOISEREC
4 13
V+ NOISEDET
C352
5 12
IFIN RSSI C396
6 11
0.1 DEC IFOUT 39P 0.1
7 10
FILOUT QUAD
8 9
C401
FILI N AFOUT
R351
NJM2591V
120k
C351
470P
R362 C378
C360 0.001
56k
0.001
R361
33k
R359
15k
Q309 WIDE/Narrow
C355
LDTC144EE
0.001
R367
WIDE/Narrow
470
SQLUELCH
PLLSW
VHFC
TXMUTE
UHFC
2.44V
22P D311
C402 HSC277TRF
2.77V
4.86V
VHFC VR5
Q316
UNR9115G0
D314
HSC277TRF C414
0.001
4.86V
ON:2.03V
22P D312
UHFC UR5
C403
HSC277TRF
Q317
UNR9115G0
3.43V 2.41V
1SV308
C415
D315 0.001
O N:2.03V
47k
R396
0.75V
2.50V
0.01
C405
C407
0.01 C412 L319
Q318
2SC4226
0.01 1U
3.3k
R388
Q315
2SC4738
SW
*: Refer to the PARTS LIST for the value and name of component.
TTEMP
5VS
VCC- I
T5
R5
T5
4.22V
T5
4.80V
T5
3.70V
1SV308
39P
0.71V BPF1 /ISET1
C427 D319
C413
Q512 2.03V
2SC5231A
0.001
1.31V BPF2 /ISET2
VHF 1ST LO FILTER
BPF3 /PSET
R404
L314 L316
47 39N 39N
UHF 1ST LO FILTER
R405 L315
0 18N
R408 L317 L318
C2012C 22N
100
R409
330
C428
10P
FL-439
OUT GND
2 3
GND IN
4 1
FI301