SmartSeis
TM
Maintenance Manual
11
Geophone input connector J1
Power connector J2
LK14
LK15
LK23
LK22
LK5
Figure 2. Diagram of an acquisition board (top view). J-numbered ports connect to ribbon
cables terminated with appropriate connectors and LK-numbered jumper pins are connected
with jumpers. See
Section 2.2.1, Acquisition board jumper settings
, for board-specific
settings.
2.2.1 Acquisition board jumper settings
A jumper is a connector that, when placed over two jumper pins, provides continuity. Jumpers
are used to make each acquisition board specific to input from a particular set of 12 channels.
Depending on whether it is a 12- or 24-channel SmartSeis
TM
(S12 or S24), the jumper
installation will vary. Table 1 outlines the jumper settings specific to either case. Spare boards
are shipped configured as a channel 1 to 12 board unless otherwise specified.
Prior to installation of a new board, verify that the settings for jumpers LK5 and LK9-LK23 on
the new board match the board being removed and that they match the settings specified in
Table 1. Setting jumper pin pair LK5 activates the master oscillator and should only be set for
the lowest number board.
Table 1. Acquisition board jumper pin pair assignments.
Model
Board no.
Channels
Jumper assignments
S12
1
1-12
LK5, LK15, LK23
S24
2
13-24
LK14, LK22
ISA edge
LEDs
BACK
FRONT
This corner
slides into card
guide slot
