RADC DOES NOT COMMUNICATE WITH THE PMC CPU

TM 5-6350-275-24&P

Table 3-3. Remote Area Data Collector DS Maintenance Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. RADC DOES NOT COMMUNICATE WITH THE PMC CPU (Figure 3-3, and FO-4, 5, 6) (continued)

Step 4. On the Stargate PWA, check for +12 v across TB1 pins 3 and 4.

If voltage is present, repair the Wiring between Comms connector DT5 and MOD2-II modem connector J1 pins 1

and 2.

If voltage is not present, replace the Stargate PWA (Stargate 5000, Para. 3-38) (Stargate 1000, Para. 3-48).

If a DES module is used, repair wiring between the DT5 connector and the DAS Terminal connector P1.

Step 5. On the DES module (Para. 3-40), verify that the warning LED is not flashing on and off along with the Key

Lost or Wrong Key LED.

If the warning LED is flashing on and off, replace the DES module. If the warning LED is off, to step 6.

Step 6. Verify that the RTU XD and RD LEDs are flashing on and off.

If both are flashing on and off the communication between the RADC and the DES module is good, go to step 7.

If the RD LED is flashing on and off and the XD is not, replace the DES module (Para. 3-40).

Step 7. Verify that the Run, RD, GD STA, GD MSG, XD, and GD LD LEDs are flashing on and off.

If LEDs are flashing on and off, communications to the FEP are good. If the LEDs are not flashing on and off,

replace the DES module (Para. 3-40).

2. LEDA FLEX PWA FAILURE (FO-4, FO-5, FO-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.

If wiring is good, replace the Leda Flex PWA (Para. 3-39).

If wiring is open, replace the wire and retest.

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