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57LFC
Service Manual
8
7
6
5
4
3
2
1
C66
IG_DATA<7..0>
0.1U PE
8A6
8B7
8C3
8D6
D
2B6
2C3
2D3
IN
GAIN 10*
IN
V+
16
CR16
MMBD1501
P106
SMUX
L21
R153
C21
V+
2A4
3A5
3A7
3D6
4A7
IN
S1 COMMON
6
5
2K 5%
220_OHM
7
4
CR17
1
2
16
15
9
10
8
7
IN
SMUX
U82
MDG444
R39
C65
0.0047U
R26
14
25
22
4
3
-15V
14
+15V
R44
10K
21
19
17
16
C19
0.1U
5%
1
B1
6
R136
3
1.33K
2
C131
0.0018U
4
-15V
U10
AD620B
S
18
R27
5.11K
PE
MMBD1501
C
L20
PMUX
A21
220_OHM
5A7
3B1
IN
V+
3
R152
2
2K 5%
1
CR19
2C3
1D4
IN
2D3
IN
MMBD1501
IDAC X2
0
VDAC X2
1
2
16
15
9
10
8
7
AD_CS*
IN
8D6
IG_RD*
IN
8A6 8C2
IN
8B7 8C2
IN
6D6
IG_WR*
U30
MAX135C
S
V+
GAIN 25M*
9
10
V-
S
PMUX
1
2
3
15
13
U82
MDG444
+15V
CR18
7
6
5
4
3
2
1
0
A/D CONVERTER
C64
0.1U
SNS_LO
13
14
20
+15V
11
IN
DGND
D
13
12
11
10
9
8
7
6
205K
-15V
S
CS
RD
WR
EOC
-5V
R34
6
REF
5
V4
B2
8
-15V
3C8
REFINLO
INHI
VAGND
TP3
7
V+
24
CREF+ CREFV+
OSC1
D7
OSC2
D6
D5
BUFOUT
D4
D3
INTOUT
D2
INTIN
D1
REF+
D0
TP5
11
V-
+15V
27
402K 26
PP
5.11K
V-
U29
MDG444
MMBD1501
3D5
4C5
32.8KHZ 4
15
13
28
5
Y1
R18
115K
13
6D6
23
+5V
+15V
+15V
1C5
6D8
8A7
8B2
+7VREF
IN
AD_MUX<7..0>
+15V
BI
-15V
INSTRUMENTATION AMP
R140
3
S
4
TP4
U22
MDG444
C
1.33K
14
C129
0.0018U
11
6
S
V4
-15V
-15V
DIAGNOSTICS/CAL MUX
P106
8D4
IN
8B7
IN
8B7
IN
SRC*
C6
SRC*
SHORT*
A5
SHORT*
OTD*
C5
OTD*
+15V
U13
3A8
3C1
IN
R92
3
10K 5%
2
V3_3
8 AD706
TC_SRC
1
4
B
R87
1.00M
TC_SRC
R89
-15V
B
1.00M
L25
+15V
220_OHM
8
6
R91
5
20K 5%
U6
4 AD706
7
+15V
C16
TC_COMP
A15
TC_COMP
TC_LO
A14
TC_LO
TC_HI
C14
TC_HI
A16
TC_ISO
C15
TC_ISO_SRC
S
R88
1.00M
-15V
13
V+
8B3
IN
TC_MEAS*
8
7
U82
MDG444
2A4
IN
6
L23
TC_ISO
V-
220_OHM
4
L24
TC_ISO_SRC
-15V
220_OHM
+15V
8 U6
+15V
3
13
2
AD706
1
8B3
3B1
5C7
OUT
IN
ISO_MEAS* 1
PMUX
V+
2
+15V
U82
MDG444
3
U13
AD706
4
8
5
-15V
7
6
V-
A
4
4
R108
499K
-15V
-15V
R127
499K
A
U97
4040
2.5V
57LFC-1006
(5 of 8)
R126
24.9K
TEMPERATURE SOURCING/SENSING
8
7
6
5
-15V
4
3
2
Figure 6-4. A6 Digital Synthesis PCA (cont)
6-22