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9-27
2715 Spectrum Analyzer Service Manual
‘‘
D
C
B
A
21 3 4 65
A12A1 4
PHASELOCK CFC
--- 5VREF
--- 5VREF
--- 5VREF
--- 5VREF
--- 5VREF
R236
3.01k
C741
0.1
C738
0.1
R241
15.0k
OP07
U852
C337
0.1
C338
0.1
R336
100
R339
100
R921
4k
R924
*
C920
0.1
L351
82uH
R350
10
+8.5V
C352
10uF
+8.5V
L451
82uH
R450
10
C452
10uF
C941
100
R431
2.00k
U941
OP07
2.00k
R430
+8.5V
39.2
R941
R444
1k
U954
OP07
39.2
R552
---8.5V
C445
10uF
C953
100
10uF
C540
5.62k
R932
562
R933
47.5
R934
15
R935
39.2
R453
---8.5V
10uF
C443
C940
100
R441
10.0k
U940
OP07
R940
5k
+8.5V
39.2
R446
10.0k
R440
U952
OP07
C442
10uF
C951
100
68.1
R847
C853
100
R848
1.21k
A
B
INH
X
Y
Y3
Y2
Y1
Y0
X3
X2
X1
X0
U831
4052
C851
100
R841
2.21k
C340
10uF
10uF
C341
+8.5V
68.1
R846
C343
10uF
10uF
C342
U854
OP07
---8.5V
2.21k
R840
R842
2.21k
C840
100
R843
2.21k
U845
OP07
39.2
R845
+8.5V
39.2
R844
---8.5V
IOA
IOB
RFBA
VREFA
VREFB
RFBB
UPD
CLR
WR
CS
A0
A1
A2
DB0
DB1
DB2
DB3
U850
AD7549
IOA
IOB
RFBA
VREFA
VREFB
RFBB
UPD
CLR
WR
CS
A0
A1
A2
DB0
DB1
DB2
DB3
U950
AD7549
+8.5V
---8.5V
R564
3.92k
R561
3.92k
C562
3300
15.0k
R563
10.0k
R576
C567
3300
R566
15.0k
U565
OP07
100
R569
10uF
C962
100
R568
C963
10uF
Option50/75
* ValuesForOption Resistors
4K
STD.
R924
LOC.
7816
201216
A<0>
A<2>
A<1>
DB<3>
DB<0>
DB<1>
DB<2>
201216
A<0>
A<1>
A<2>
DBP<3>
DBP<2>
DBP<1>
DBP<0>
4.95K
DBP<3..0>\I
SWPGND\I
SWP\I
DB<3..0>\I
UPD*\I
WR*\I
A<2..0>\I
VCFCU\I
---7.2V
+7.2V
MAIN_OFFSET\I
SWDECB\I
VSWP_PLL\I
SWDECA\I
VCFC\I
0
1
2
3
13
19
14
18
17
15
9
5
10
11
6
7
8
1
2
3
4
0
2
1
FM
M
FM
FM
FM
6
3
2
7
4
8
1
FM
0
3
1
2
18
19
13
14
17
15
2
3
4
1
6
7
8
10
11
5
9
1
2
0
FM
FM
FM
6
3
2
7
4
1
8
FM
FM
6
3
2
7
1
8
4
M
M
M
6
3
2
7
4
8
1
FM
FM
FM
TUNE
TUNE
6
3
2
7
4
8
1
M
FM
6
3
2
7
4
8
1
M
3
10
9
6
11
15
14
12
1
4
2
5
13
FM
6
2
3
1
8
4
7
FM
FM
1
8
4
7
2
3
6
FM
3A6>
6C1>
6C1>
3A6>
3A4>
3B6>
3A5>
2B4<
5D2<
3A4>
5B1<2D1<
3A4>
2B1<