Fluke 2680A Service Manual page 219

8 7
BACKPLANE CONNECTOR
+5V
P3
D
48
CARD0_RX
99
L4 OUT
1
70 OHM
97 CARD0_TX
L16 IN
5
95 GUARDCK0
L22 IN
94 GUARDCK0*
L5 IN
93
92
91
98
49 CARD1_RX
L6 OUT
2
70 OHM
47 CARD1_TX
L17 IN
10
GUARDCK1
45
L23 IN
44 GUARDCK1*
L7 IN
59
82
41
90
89 CARD2_RX
OUT
L8
88
70 OHM
87 CARD2_TX
L18 IN
86
85 GUARDCK2
L24 IN
84 GUARDCK2*
L9 IN
83
22
81
40
39 CARD3_RX
+ +
L10 OUT
38 C28 C39 C42 C40
70 OHM
37 CARD3_TX 10U 0.1U 10U 0.1U
IN
L19
36
35 GUARDCK3
L25 IN
34 GUARDCK3*
L11 IN
33
42
C
31
80
CARD4_RX
79
L12 OUT
23
70 OHM
77 CARD4_TX
L20 IN
46
75 GUARDCK4
L26 IN
74 GUARDCK4*
L13 IN
28
72
71
30
29 CARD5_RX
L14 OUT
73
70 OHM
CARD5_TX
27
L21 IN
26
GUARDCK5
25
L27 IN
24 GUARDCK5*
L15 IN
78
32
VCC
21 CARD0_EN*
CARD1_EN* SPI DRIVERS AND CONNECTOR FOR
70 U3
20 CARD2_EN*
CARD3_EN* THE VACUUM FLOURESCENT DISPLAY
69
19 CARD4_EN*
AND CALIBRATION EEPROMS
68 CARD5_EN* 74LCX125
14
18 DISP_EN*
L37
67 3 2 DISPLAY_RST*
OE
66
70 OHM 1
65
7
64
63
U3
62
74LCX125
61
L36
14
60 6 5 SPI_CK
OE
76
70 OHM 4
9 7
U3
TP5
DISPLAY_IRQ*
58 74LCX125
B
8
L35
TP7 14
57 11 12 SPI_TX
TP8
OE
17
70 OHM 13
16 7
U3
15 74LCX125
14
L34
14
13 DCLK
8 9
12 OE
10
70 OHM
11 7
43
VCC
7
TP9
VCC
56 U12
TP10
6 7SZ125
TP11
55 5
L38
96 SPI_RX
OUT
4 FIL1 OE
70 OHM
FIL2
3 3
50
100
53 R115
54 R116
10.0K
51
10.0K
52
-5V -30V
SMC_TX
L39
SMC_RX
70 OHM
L40
C19
70 OHM 0.1U
L42 L44
A
70 OHM 70 OHM
L41 L43
70 OHM 70 OHM C148
0.1U
6 5
DIFFERENTIAL PAIR ENETRX+
ENETRX-
R85 R86
49.9 49.9
7
8
9
VCC
C29 10
0.1U 6
+
C146 C147 1
10U 0.1U
4
V+
CLOCK
U16 R181
1 3
-INH OUT
25.0MHZ 49.9
GND
2
HRESET*
IN
4
R87
10.0K
IN
IN
IN
VCC
C155
IN
0.1U
C44 VCC
2
0.1U C1+
3
C1-
C41
0.1U 5 C2+
6
C2-
LTC1348
TXD1 25
DR1IN
RTS1 23
DR2IN
DTR1 19
DR3IN
RXD1 24
RX1OUT
R114 CTS1 22
RX2OUT
C82 DSR1 21
10.0K RX3OUT
20
RX4OUT
18
RX5OUT
0.1U
17
DREN
VCC
GND
14 17
T1I T1O
13 8
T2I T2O
U7
15 16
R1O R1I
12 9
R2O R2I
AMD1385ARS
2 7
C1+ V-
4 3
C1- V+
C150
5 0.1U
C2+
6
C2- C149
0.1U CONSOLE RS232 PORT
P5
1 20 DEVEL ONLY
DD SD
GND
4
10/100 BASE-T ETHERNET TRANSCEIVER
MII<17..0>
MAXIMUM TRACE LENGTH FROM U17 TO T1 IS 1 INCH
VCC_U17
R100
DIFFERENTIAL PAIR 49.9
75 77 ENETTX+
XTL+ TX+
74 78 ENETTX-
XTL- TX-
64 69
RX+ FXT+
63 70
RX- FXT-
67 26 14
TEST1/FXR+ U17 RXD0
66 25
15
TEST0/FXR- RXD1
24 16
RXD2
62 23
17
TEST3/SDI+ RXD3
31 13
RX_ER/RXD4
37
TXD0
38 30
11
TXD1 RX_CLK/10RXCLK
39
TXD2
40 33
5
TXD3 TX_CLK/10TXCLK/PCSBPCLK
32
TX_ER/TXD4
41
3
COL
34 42 0
TX_EN/10TXEN CRS
1 6
PCSBP CLK25
2
ISODEF
3 68
ISO TEST2
AM79C874
5 43 ENET_IRQ*
REFCLK INTR OUT
7 29 12
RX_DV
BURN_IN
9
PWRDN
18
PHYAD0
8 17
RST PHYAD1
16
PHYAD2
55 15
TECH_SEL0 PHYAD3
54 14
TECH_SEL1 PHYAD4
53
TECH_SEL2
46 LEDRX*
LEDRX/LED_SEL
22 45
MDC LEDCOL/SCRAM_EN
48
LEDLNK/LED_10LNK/LED_PCSBP_SD
56 44 LEDSPD0
ANEGA LEDSPD0/LEDBTA/FX_SEL
57 LEDSPD1
LEDSPD1/LEDTXA/CLK25EN
61 58
RPTR LEDDPX/LEDTXB
47 LEDTX*
LEDTX/LEDBTB
72 19
IBREF GPIO0
20
GPIO1
21 2
MDIO
R88
10.0K
R89
1.50K
VCC
RS232 TRANSCEIVER
C51
0.1U
V+
C50
27 0.1U
C3+
26
C3-
U8
P1 P6
49.9
C140
MT1 8
7 1 7 180P
DR1OUT
0.25W
9
DR2OUT 2 6
13 3 5
DR3OUT
4 4
49.9
C36
8 5 3
RX1IN
10 6 180P
RX2IN
0.25W
11
RX3IN 7 P6
R122
12 8
RX4IN
14 9 C174
RX5IN C142
C139 49.9
180P MT2 180P
16 180P
RXEN
0.25W
V- C173
C143
180P
180P
C145
C144 C119 180P
C45
180P 180P
0.1U
Schematic Diagrams
3 2
R15
VCC
T1
2.2M
C135
16 1
RX
R101 0.033U
15 2
49.9
R17
2.2M
14 3
C136
C57 TG110-S050N2
0.033U
0.1U
R27
11 6
2.2M
TX
C137
10 7
0.033U
R49
9 8
2.2M
C138
C58
0.033U
0.1U
R130 R131
75.0 75.0
VCC
DS1
GREEN
R156
4 3
100
RED
R128
1 2
100
LED-591-3001
R129
100
DS5
591-2101
R123
100
DS3
591-2101
BUFFERS AND PROTECTION FOR EXTERNAL TRIGGER IN AND OUT
AND MASTER ALARM OUTPUT +5V
VCC
CR1
BAV199
R145 R72 R13
L29 2K 2K 10.0K
R5
5% 5% 5
U11
70 OHM
2 4
1%
7SZ14
L30
3
R4
70 OHM
1%
Q2
L31
CR2 NDS351AN
BAV199
70 OHM S
1%
CR4
Q1
BAV199
S
VR1
6V NDS351AN
5233
5%
2680A-1004
(2 of 5)
Figure 8-2. Controller/System Power PCA (cont)
8
1
D
P2
MT1
1
2
3
4
5
6
7
8
MT2
R132
75.0
R133
75.0
C
C59 C60
220P 220P
B
TRIG_IN
OUT
TRIG_OUT
IN
MST_ALM
IN
A
8-7