Icom IC R8500 Service Manual Addendum page 143

Apr. 2010
q
w
e
r
t +16
y +8
L90 R59 +
L113
100uH 100
100uH
u +5
i
C254
1
5.05V
IC5 Q42
MC145190F R254 2SC4081
10k
1 20
REF O REF I
o 2 19 Pdat
LO DATA I
3 18 Pck
R57
R CLK
10k C255 4 17 STP1
V ENABLE
0.1
5 16
VPD OP A
5.00V
6 15
+
PD O OP B
7 14
GND VDD
R251
8 13
RX TEST2
1k
C53 R246
9 12
TEST1 VCC
0.001 47
10 11
FIN FIN
C355
33p
Q43
2SA1576
P7 J7
!0
!1
!2
5.02V
EP4
J8
Above 30MHz
!3
:5.02V
Below 30MHz
:0V
0V
Q37 Q13
5.05V
VCO2
DTA144EU
DTC144EU
L23
Q52
1uH
DTC144EU Q53
VCO1 DTA144EU
!4
L22
1uH
Q54
4.98V Q55
DTC144EU
VU DTA144EU
!5
!6
!7
!8
!9
D18
L42 L43 L44
1SV237 R237 C421 C423
9p 15p 27nH 33nH 33nH
47
2 3
@1 Q49
DTC144EU
C420
C140 C142
1 4
0.001
2.5p 1.5p
@2
R125 0V 0.1M-29.99999MHz
R296
680
:4.99V
680
D19
1SV237
@3
4 1
R297
L77 L46 L47
R127 C426 C428 R130
680
12nH 10nH 12nH
680 3p 5p 18
@4 3 2
C425
C146 C148
0.001
0.5p 0.3p
@5
@6
@7
@8
@9
#0
#1
#2
4.97V
R176
100k
IC18
TC7S04F
4.92V
1 5 1
VSS
2 2
FSK1
3 4 3
+
FSK0
4
ETC0
5
ETC1
6
IC15
VDD
7
SYS CLK SC-1287A
8
(TC190G02EFG-0058)
NUM0
9
NUM1
10
NUM2
11
VDD
#3
L50
C177
1uH
0.01
L78
1uH
#4
C166
56p
R189 R190 R191 R192 R193 R194
2k 2k 2k 2k 2k 2k
#5
PAKA
15.7V
Q41
DTC144EU
0V 5.06V
R259
4.7k
Q40
DTA144EU
3 4 5
Q38
FMS2A
IC20b
3 TC4W66F
0V
2 1 6 5
R262 100
C456
R299 2.2k 0.01
C400
0.001
1 2 1
R301
Q39 8
3.3k
FMW2
7 4
IC20a
+
TC4W66F
5 4 3 2
+
3.83V
LV
+5
R80 18
1 4 D25
C83 1SV237
4.87V 4.78V
C82
0.001
2 3 1
0.001
R82
D7
680
1SV237 2
IC9
uPC2709T
1 8 5.04V
GND OUT
2 7
GND GND
0.1M-
3 6
IN VCC
0V 29.99999MHz
:4.68V
R289
Q50
2.2k
RN2424
IC23 +
L104
MB511PF
100uH
1 8
IN IN
2 7
VCC S1
C407
3 6
0.001 NC S2
4 5
OUT GND
C151
0.001
COUL
+16
15.4V
3 8
+
1
2
-
IC8a
33 4
I NJM4558M
32
Q
31
IC8b
POM2
30 R77 NJM4558M
POM1
1M
29 5
POM0
+
28 7
VDD
27 6 -
VSS
R267
26
RESET
1k
25
ROMCE
24
VDD
23
DA9
C360 C362
270p 470p
R201 3.97V
180k
L63 L64
R202 C209
470uH 470uH
220 0.1
L79
0.67V
18uH
Q31
C204 C206
68p 27p 2SC4081
R231
100
R195 R196 R197 R198
2k 2k 2k 2k
C406 L99 L100 L019
R284
0.01 0.1uH 68nH 0.1uH
18
C394 C395
36p 12p
Q47
RN2424
Q46
L102 C367
R279
DTA144EU
1uH 1
100
0V(0.1M-29.99999MHz:4.68V)
IC22 +
L103
Q48
MB511PF
100uH
2SC4081
1 8
IN IN
2 7
VCC S1
3 6
NC S2
4 5
OUT GND
C84 C85 C86 C375 L29 L30 L31
4p 2p 1.5p 3p 3.9nH 4.7nH 5.6nH
L91 C92 C94 C239
100uH 2p 1p 0.3p
D26
1SV237 R85
C460 47p
18
4 1
L96 L97 L98
C378 C380 C382 C384
5.6nH 6.8nH 8.2nH
7p 3p 2.5p 3.5p
4 3 2
L92 C386 C388 C390
3
100uH 2p 0.5p 0.3p
C365
1
Q51
2SC4081
C413 L105 L105 L107
R293
0.01 0.27uH 0.27uH 0.22uH
18
C414 C417
8p 15p
L87
R213
0.39uH
18
C218
0.01
+
MEASURMENT CONDITIONS
DIGITAL MULTIMETER :50ku/V DC
DISPLAYED FREQUENCY:500MHz
MODE:FM
0.1 -14.99999MHz
30 -242.09999MHz
3.85V VCO1 4.99V
u1 500 -754.09999MHz
(V1) (7.24V)
1025-1242.09999MHz
1LLV
1500-1754.09999MHz
Other freq:0V
+
15 -29.99999MHz
242.1 -499.99999MHz
VCO2 4.99V
754.1 -1024.99999MHz
(V2) (7.24V)
1242.1-1499.9999MHz
1754.1-1999.99999MHz
Other freq:0V
L62
C213
22uH
0.01
C202
0.0015
PLL-B UNIT
J11 P8 to
H1LO
RF-A
UNIT
J3
PLL-B UNIT
EP20
J2
V1LO
P2
J12 P9 to
H2LO
RF-A
UNIT
J2
EP22
J3 P3 to
V2LO MIX
UNIT
J2
EP5 EP6
J5
REF
EP9 EP10
J6 P6 to
BFO MAIN
UNIT
J4
EP7 EP8
J4 P4 to
3LO MAIN
UNIT
J3
P5
32