TM 11-6660-266-13
b. Check that power cable W8 is connected to MARWlN Processor and Power Supply Unit. If not, connect in
accordance with paragraph 2-4-4-e, step (5).
c. Check that Power Supply Unit DC PWR circuit breaker is in up position.
d. Ensure that Power Supply Unit DC INPUT POWER LED is illuminated. If LED is not illuminated, refer to
e. Set Power Supply Unit PROCESSOR power select switch to DC ON position.
f. Ensure that Power Supply Unit PROCESSOR LED illuminates. If LED does not illuminate, refer to Chapter 3.
g. Reestablish communication link between DCT and MARWIN Processor by cycling DCT power switch to OFF,
then ON.
NOTE
If power is restored within 2 minutes, the MARWIN Processor will retain the
accumulated flight data and step h. is not required and should not be
performed.
h. Restart MARWIN Processor by pressing Processor power ON switch.
2-10-2. DC Power Failure.
When the system is powered by DC primary power and an interruption occurs, the MARWIN Processor, the
NAVAID Antenna Set, and the Printer will continue to operate for up to 2 minutes without the loss of data. If
power is lost for more than 2 minutes, then all flight data will be lost. Except for interruptions less than 20
milliseconds, all DC power interruptions will result in complete loss of operation of the DCT. During DC power
failures, the system may be operated from a AC primary power source.
To operate the system from AC primary power, proceed as follows:
a. Check that power cables W1 and W2 are connected to AC power source and Power Supply Unit. If not,
connect in accordance with paragraph 2-4-4-f, step (3).
b. Check that power cable W7 is connected to MARWIN Processor and Power Supply Unit. If not, connect in
accordance with paragraph 2-4-4-e, step (5).
c. Check that Power Supply Unit AC PWR circuit breaker is in up position.
d. Ensure that Power Supply Unit AC INPUT POWER LED is illuminated. If LED is not illuminated, refer to
e. Set Power Supply Unit PROCESSOR power select switch to AC ON position.
f. Ensure that Power Supply Unit PROCESSOR LED illuminates. If LED does not illuminate, refer to Chapter 3.
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