User's Manual

SBS-900 Shore Based Radar Systems
Chapter 10: Corrective maintenance
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 169 of 240
Processor replacement
Replacement: The processor is replaced by reversing the removal procedure.
Supporting lugs: The processor can be temporarily rested on two logs inserted into the
backplate of the enclosure. This helps to support and align the processor
during the replacement processes but does not secure the unit into place.
Caution: As noted in the previous section, the processor is a heavy item;
care should be exercised when replacing the unit.
Retaining bolts: Replace the 17 retaining bolts and washers removed earlier in the removal
process. ALL 17 fasteners MUST be replaced.
Caution: The bolts ensure that a full thermal bond is achieved between the
processor and the heatsink in the enclosure. Failure to replace a bolt
increases the possibility of a poor bond leading to L[Tec@lXo cebVXffbe
overheating issues.
Waveguide: Replace the waveguide joiner removed earlier between
nb_ Rb[ljDs_x jli]_mmil [h^ nb_ g[ch q[p_aoc^_- @ff
nuts, bolts, washers and waveguide shims/ O-rings
must be replaced.
Pay particular attention to the orientation of the
waveguide shim.
Connectors: Reconnect all connectors.
The D-type connectors have sliding metal retainers which must be moved
fully one way to lock the connector into position
Locked Unlocked
Re-Y\go7 Where removed to improve access, refit the following:
- The fibre Optic cable/ connector
- Static desiccator
- Clear power supply protection cover.
Unit inspection: Prior to restoring AC power to the system carry out the following checks:
- All fasteners are securely tightened.
- All connectors are securely fitted in the correct positions.
- All RF (Waveguide) couplings are securely and correctly fitted and
tightened.
Test: When th_ Rb[ljDs_x jli]_mmil b[m \__h mo]]_mm`offs l_-fitted, apply AC
power to the system and test.