Page 20
Pentek Model 78661 Installation Manual
Rev.: 1.7
2.9
PCIe Carrier LEDs
This section describes the LEDs, labeled
Dnn
on the Model 7806 carrier PCB, that pro−
vide power operating status for the board.
The following green LEDs indicate power applied to board resources.
Note that you can measure the voltage across resistor
R6
(0.012 ohms) to determine the
current draw for the +12 Volt supply, and the voltage across resistor
R5
(0.012 ohms) to
determine the current draw for the +3.3 Volt supply. These resistors are identified in
above.
LED
USE
D1
Green LED indicates the presence of
−
12V XMC Power Supply
D3
Green LED indicates the presence of +12V at the 6
−
pin PCIe Power Connector (J23)
D4
Green LED indicates the presence of +3.3V from the PCIe bus (motherboard)
D5
Green LED indicates the presence of +3.3V from the onboard Power Supply
D6
Green LED indicates the presence of +12V after the Fuse
F1
*
* If
D3
is illuminated and
D6
is not, this indicates the fuse
F1
is blown.
J4
F1
D1
D5
D4
D3
D6
R6
J15
XMC
Site
J16
J14
Cooling
Area
1
1
3
J22
J23
J19
J18
J20
J21
J5
J3
J8
R5
2
4
1
3
1
3
1
3
1
3
1
3
J17
J2
Figure 2
−
7: Model 7806 PCIe Carrier PCB Connector Side
D5
D4
D3
D6
D1
F1
R6 R5