SDQLCAI-1 Maintenance
May 2002 3-3
A digital multimeter can be used to test I/O wiring and I/O signals to the termination assembly. Power-
off continuity tests can be used to test for correct wiring. When performing tests with power applied,
refer to section 6 for the signal levels required at CAI input terminals.
Another way to troubleshoot the CAI is develop a test configuration using the 4-mation configuration
software. This test configuration is to be used in an off-line service environment. A test configuration
can used to exercise each channel’s operation.
To obtain spare or replacement parts, refer to section 3.8. To return a failed assembly to the factory for
repair, refer to sectionS 2.4.4 AND 2.4.5 There are no user-serviceable parts within a CAI. Only fuses are
to be replaced on the termination hardware.
3.5 CAI Removal/Replacement
During operation, the CAI communicates with its associated control module [Critical Control Module
(CCM)] over the IOBUS. This bus runs continuously along the backplane of a 10-slot MODULRAC, 6-
slot SIXRAC, or 4-slot Remote I/O Rack. This means a CAI can be removed from or installed into a rack
without removing power from the module slot, from I/O circuits, or from the rack.
3.5.1 Removal
1. As detailed in Figure 2–7, pull open the bezel’s pivoted top and bottom handles to expose the
module’s slotted captive mounting screws. Loosen the screws.
2. Grasp the top and bottom handles and pull the module from the rack.
3. Place the module in a static shielding bag and package it for safe return. Refer to section 3.8 for
return instructions.
3.5.2 Replacement
1. Remove the replacement module from its protective bag. The module can be safely handled, as the
circuit card is shielded from access by protective covers. If present, set aside the keying pin kit.
2. If the module is already keyed, confirm that its keying pattern matches that of the removed module.
If not keyed, key the replacement module as described in section 2.6.1.
3. Insert the CAI in its rack slot. Carefully seat the module in the rack’s backplane and termination
board connectors. A properly seated module engages the backplane and termination board connectors
and has the rear surface of its bezel flush against the rack’s rails.
An improperly keyed module that is not matched to a slot does not engage the backplane and
termination strip connectors or seat flush against the rack’s front rails.
4. As shown in Figure 2-7, pull open the bezel’s pivoted top and bottom handles to expose the module’s
slotted captive mounting screws and secure the module to the top and bottom rails. Close the bezel’s
handles when finished.
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