GE LOGIQ E9 Service Manual page 290

GE
D 5535208-100, R
IRECTION
7-5-8-1 Digital Receive (cont'd)
Name: DRX Signal Path Test (this test provides the most coverage on the DRX)
Description: Digital signal path sourced from input to Nathan. Does not test ADC. Sends simulated data
across the signal path.
Run Time: 00:03
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
2.) Replace any failed DRX boards.
3.) Interface to GFI may be cause of the failure. See:
Name: Nathan Channel Repeater Test
Description: Tests the functionality of the Nathan channel repeater. Looks for latency signal
communication issues analog signal path.
Run Time: 00:05
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
2.) Replace any failed DRX boards.
Name: Nathan Alignment Test
Description: Output TVG of Nathan with system configured for max number of MLAs supported by
system. Verifies the alignment (16 identical samples in a row) of IF to GFI.
Run Time: 00:05
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
2.) Replace any failed DRX boards.
Name: Nathan Input TVG Alignment Test
Description: Input TVG of Nathan with system configured for max number of MLAs supported by
system. (Internal and external test modes of Nathan.)
Run Time: 00:05
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
2.) Replace any failed DRX boards.
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EV
Section 7-5 - Common Service Desktop
LOGIQ E9 S
7-5-8-3 "GFI" on page 7-46.
M
ERVICE ANUAL