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 150 of 240
10.7.7.3 Links and switches
Links Factory default position Optional settings
1, 2 & 3
A position
Direct buffer mode
B position
Processor mode
4
Open
Test mode disabled
Made
Enables test mode (factory use only)
5,6 & 7
Open
Signal input filter disabled
Made
Signal input filter enabled
8,9 &10
Open
Low input voltage signals disabled
Made
Low input voltage signals enabled
Switches
SW1
SW2
Not used (factory use only)
SW3
0 Quad IN 4
90 Pulsed IN
Quad OUT
1
8192 Pulsed IN
Quad OUT
5
Quad IN
4096 OUT
2
4096 Pulsed IN
Quad OUT
6 to F Spare/ not used
3
180 Pulsed IN
Quad OUT
Note: When changing any links or switch settings, the PCA must be powered OFF/ ON to accept the
link setting changes.
10.7.7.4 Removal & replacement
Disconnection: Ensure that the DTX-A7 Transceiver Assembly is fully isolated from all
sources of AC power.
Noting their polarity, carefully disconnect PL1 and PL2.
Removal: The DTX-A265 PCA is retained onto the chassis by 4 nuts. Remove and
retain the nuts as they will be required for refitting.
The PCA may now be removed from the DTX-A7 enclosure.
Replacement: Ensure that all links and switches on the replacement board are set in the
same position as those on the PCA that has just been removed.
To replace the board reverse the removal process.