Fluke 39 - Page 102

39/41B
Service Manual
7-6
Figure 7-1. A1 Main PCA (Fluke 39 and 41B) (cont)
AD706
U18
750PF
C1
AD706
U18
1000PF
C2
750PF
C6
100PF
C8
A
S
A
499K
R21
A
0.1
C41
0.1
C43
A
0.1
C34
0.1
C35
0.1
C37
0.1
C38
0.1
C39
0.1
C40
0.1
C42
0.1
C44
750PF
C14
A
0.1
C36
J1
J2
R15
226K
750PF
C19
R1
20K
47PF
C33
L1
1T
L2
1T
L3
1T
A
MMBT3904
Q7
R23
470
1000PF
C3
Q6
MMBT3904
R18
470
R20
499K
U13
DG444DY
U13
DG444DY
U12
DG444DY
U12
100PF
C4
U12
1.0K500K
Z6
1K
Z7
R9
20K
9K
Z7
9K
Z7
1K
Z7
A
S
R10
75K
VDD
VSS
VDD
VSS
1.0K500K
Z6
VDD
AD820BR
U10
IN-
IN+
GND
CS*
CLK
DOUT
VREF
VCC
LTC1092CS
U15
R11
121K
IN-
IN+
GND
CS*
CLK
DOUT
VREF
VCC
LTC1092CS
U14
U13
DG444DY
U13
DG444DY
VSS
VSS
VSS
VSS
VSS
VSS
VSS
R13
36.5K
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
S
R14
20K
S
1
1
1
U17
AD706
AS
D
0.1
C58
0.1
C59
A
100NF
C60
R76
100
U17
AD706
R71
100
CR9
BAV99
U12
DG444DY
V-
V+
AD820BR
U9
AAD
VSS
VDD
S
A
R2
75K
A
D
R80
10
R81
47
470PF
C74
47PF
C75
P5
P7
RT1
1.1K
R38
470
A
2K
Z4
2K
Z4
2K
Z4
2K
Z4
2K
Z8
2K
Z8
2K
Z8
2K
Z8
R3
121K
R17
10K
R4
36.5K
R5
20K
U16
AD706
U16
AD706
R6
226K
AMPS
7281
5463
7254
8163
8172
6
354
4
3
2
1
16
13
12
98
5
4
1
16
13
12
98
5
4
1
21
21
21
7
21
6
43
CA
13
4
32
1
8
76
32
1
8
76
16
15 14
13
1110
9
1110
9
16
15 14
7
6
4
3
2
7
6
4
3
2
8
4
3
2
1
8
7
6
5
4
8
4
3
2
1
8
7
6
5
4
8
7
6
5
4
8
4
3
2
1
1
1
1
1
CS_AD*
1%1% 1%
1W1W1W
X1A_AMP
X10A_AMP
X10B_AMP
X1B_AMP
X2_VOLT
X4_VOLT
X1_VOLT
VREF
COMM
VOLTS
CS_AD*
DOUT_VOLTS
DOUT_AMPS
SCK*
VREF
VREF
SCK*
1%
1%
1%
1%
1%
1%
1%1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1W
1000V
1%
1W
A
VREF
C
C
F
A
F
F
F
B
H
H
B
H
H
FLUKE 4X-1021
(4 of 6)