TM 5-6350-275-24&P
Table 3-4. SubRADC (Leda) With Power Supply DS Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. LEDA FLEX TERMINATION PWA FAILURE (Figure 3-4 and 3-6)
Step 1. Check the power on lamp on the Leda Flex Termination card. The lamp should be on.
If the lamp is on, go to step 6.
If the lamp is off, replace the termination card PWA (Para. 3-64).
If the lamp is still off, reinstall the termination card PWA and replace the Leda Flex PWA (Para. 3-63).
If the Leda Flex termination PWA is still showing a failure, go to step 2.
Step 2. Using a multimeter, check for +12 vdc across TB8 pins 1 and 2.
If voltage is present, replace the PWA. (Para. 3-64).
If voltage is not present, go to step 3.
Step 3. Using a multimeter, check for +12 vdc across TB7 pins 1 and 2 on the Leda Flex PWA.
If voltage is present, replace wiring between TB7 pins 1 and 2 and the Leda Flex Termination Board TB8 pins 1
and 2.
If voltage is not present, go to step 4.
Step 4. Using a multimeter, check for +12 v across TB1 pins + and - on the power supply PWA.
If voltage is present, replace rectifier assembly. (Para. 3-66)
If voltage is not present, check fuse F1 on power entry module and replace if necessary. (Para. 3-69)
If fuse is not blown, go to step 5.
Step 5. Using a multimeter, check for 120 vac across pins 1 and 2 of power entry module.
If voltage is present, replace the power supply. (Para. 3-65)
If voltage is not present, notify facility engineers.
Step 6. Make a visual inspection of the 12 LEDs (lamp indicators) on the Leda Flex Termination PWA. The LEDs
should be out, unless a sensor is in alarm or tamper (open or short). When the LED is red, the sensor is in alarm.
When the LED is green, the sensor is in tamper short. When the LED is amber (red & green), the sensor is in tamper
open.
If any of the LEDs are lit, remove the wire(s) to the input terminal(s) of the terminal board for the LED that is lit.
The LED should change to amber (tamper open).
3-22
