SmartSeis
TM
Maintenance Manual
12
The interrupt jumper on each board, including the OMNI board, is identically installed so that
there will be no system conflicts. This jumper setting normally does not need to be changed, but
the information is provided here for troubleshooting purposes. The interrupt jumper is set as
follows:
• acquisition boards LK1 and the OMNI board JP3(IRQ10), or
• acquisition boards LK2 and the OMNI board JP4(IRQ11), or
• acquisition boards LK3 and the OMNI board JP5(IRQ12), or
• acquisition boards LK4 and the OMNI board JP6(IRQ15).
2.3 Replacing the OMNI board
The OMNI board, always the top-most board, serves many purposes, and thus, has many
cable connections (Figure 3). While most of the connectors are keyed and sized to prevent
wrong connections, we suggest that you make a careful drawing of the cable connections
specific to your seismograph prior to board removal.
There is one pair of connectors that are the same size, and if the connectors are swapped, the
seismograph will be damaged upon power-up. The two connectors that must not be confused
are of the IDE hard drive cable and the front LCD panel cable. These cable connections have a
few distinctions that assist in making the proper connections. The IDE hard drive cable plugs
directly to the hard drive, while the LCD panel cable passes through a cable slot and is typically
longer in length to reach its port on the board. The number of the OMNI board port that the
hard drive should connect to is named J6, while the LCD panel port is named J2 (Table 2).
You might want to label each of the cable connectors with the names of their corresponding
ports to prevent the connectors from getting swapped.
