TM 5-6350-275-24&P
Table 3-4. SubRADC (Leda) With Power Supply DS Maintenance Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. LEDA FLEX PWA FAILURE (Figure 3-4 and 3-6)
Step 1. On the Leda Flex PWA, monitor the Heartbeat LED. The LED should be flashing on and off approximately
once per second.
If the LED is flashing on and off, go to step 2.
If the lamp is not flashing on and off, go to step 4.
Step 2. Monitor the Tx and Rx LEDs on the Leda Flex PWA. The LEDs should flash on and off as data is being
transmitted to or received from the Stargate PWA.
If the Tx or Rx LED does not flash on and off, go to step 3.
Step 3. Set multimeter to read ohms and check for open wiring between the Leda Flex PWA TB7 pins 4 and 5 and
Stargate PWA AUX 0 Connector pins 2 and 6. (Place jumper wire across Stargate PWA AUX 0 Connector pins 2
and 6 )
If wiring is good, replace the Leda Flex PWA (Para. 3-63). (Remove jumper wire)
If wiring is open, replace the wire and retest.
Step 4. Set multimeter to read dc volts. Place negative lead on TB7 pin 2 and the positive lead on TB7 pin 1. The
multimeter should read +12 v.
NOTE
If there is an AC voltage line loss, an alarm will be generated
If the multimeter indication is correct, replace the Leda Flex PWA (Para. 3-63).
If dc voltage is not present, check for open wiring between the following points and replace as necessary:
FROM
TO
Leda Flex PWA
Bridge Rectifier
TB7 pin 1
+ Positive Terminal
TB7 pin 2
- Negative Terminal on power supply TB
3-21
