Troubleshooting
Check the cable
connections
Refer to the figu
res in the Remove and replace procedures section to see the
proper routing for the cables. (See page 3-6.)
AC input cables. The AC input cables go from the line filters to the J10 and J20
on the Combiner board. The line filter nearest to the side of the instrument should
go to J20 to preserve the left and right association between supplies and AC
inputs. (Se
eFigure3-14onpage3-20.)
Light pipes for AC and DC LEDs. There are four light pipes that carry light from
LEDs on the Combiner board to lenses for the power supply AC and DC LEDs
on the front panel. It is important that the top and bottom light pipes route to the
correct receptacle on the Combiner board. Each is receptacle on the board is
labeled a
s “top” or “bot” (bottom) to assist in making correct connections. (See
Figure 3-15 on p age 3-21.)
14-pin white power cable. The 14-pin white power cable between the Combiner
board and the Main board carries +5.2 V power to the Main board, +3.3 V power
from the Main board to the Combiner board, and carries the I2C control, power
fault
and AC power low signals. The cable latches in place.
16-pin Display board ribbon cable. The 16-pin ribbon cable from the Processor
board to the Display board has a polarized header on the Processor board. On the
Display board, the pin-1 red wire should be on the bottom.
26-
pin Front Panel board ribbon cable. The 26-pin ribbon cable from the Main
board to the Front Panel board carries +3.3 V and +5 V power, the button signals,
and the LED serial chain. Both ends of the cable are polarized.
60-pin channel board cables. Each installed channel board has a 60-pin cable that
connects to the Main board. Depending on the installed options, an instrument
m
ay have from 1 to 4 of these large wire cables. Correct connectivity and polarity
are two important items to check with these cables.
The four connectors on the Main board are labeled slot 1 to slot 4. The channel
board that mounts above the Main board must connect to the Slot 1 connector on
the Main board. The Slot 2 connector on the Main board must connect to the top
channel board installed near the AC connectors. Each subsequent slot connector
goes to the next channel board that is installed lower in the stack. It is important
not to skip a slot connector on the Main board or to reverse the order of channel
board connections.
The 60-pin cables and connectors are polarized, but it is possible to force them in
wrong direction and it can be difficult to tell if the cables are fully seated. The
polarization is a small tab on the pin 60 end of the connector. The polarization
tab g oes toward the front of the instrument on the Main board and to the top and
toward the AC line filters on the channel boards.
ECO8000 Series Service Manual 4–15
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