TM 5-6350-275-24&P
Table 3-3. Remote Area Data Collector DS Maintenance Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. RADC DOES NOT COMMUNICATE WITH THE PMC CPU (Figure 3-3, and FO-4, 5, 6)
Step 1. On the Stargate PWA, monitor U22 LED 1 (+5 v power). The LED should be on.
If LED is not on, check for 18 VAC across TBI plus 1 and 2.
If voltage is not present, replace the 18 VAC adapter (Para. 3-53 or 3-59)
If the LED is not on, replace the Stargate PWA (Stargate 5000, Para. 3-38) (Stargate 1000, Para. 3-48).
If the LED is on, go to step 2.
Step 2. Monitor the RTS, TD, CD, and RD LEDs on the MOD2-II modem PWA. The LEDs should be flashing on
and off.
If the LEDs are flashing on and off, communication from the PMC CPU to the MOD2-II modem PWA is good.
Go to step 3.
If the LEDs are not flashing on and off, adjust R18 (TX) level and R10 (RX) level, adjust until the LEDs begin
flashing on and off.
If the LEDs are still not flashing on and off, check for +12 v across J1 pins 1 and 2 on the modem PWA.
If voltage is present, replace the modem PWA (Para. 3-42).
If the LEDs are still not flashing on and off, go to Table 3-2 and troubleshoot Malfunction 3.
If Malfunction 3 tests good, down load RSE to stargate and recheck. (Para. 3-130)
If the +12 v is not present at the Mod 2-11 modem J1 pins 1 and 2, go to step 4.
If a DES module is used in the RADC, go to step 5.
Step 3. On the Stargate PWA, monitor the Comms channel Tx LED 2 and the Comms channel Rx LED 3 on U22.
The LEDs should be flashing on and off if communications between the RADC and the PMC CPU has been
established. Also LEDs 5 and 6 (STN AD and GD PKT) on U23 should be flashing on and off. (LED 5 and 6 will be
out if a DES module is connected).
If the LEDs are flashing on and off, the communications channel within the RADC is good. Have comms lines
from the PMC CPU to RADC checked for excess noise. (checked by telephone company)
If the LEDs are not flashing on and off, go to step 4.
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