GE LOGIQ E9 Service Manual page 307

GE
D 5535208-100, R
IRECTION
7-5-8-9 Analog CW (cont'd)
Name: Service Diagnostics / Analog CW / GRX aCW IQ Symmetry
For each subtest, a signal is setup with f0=2.521 MHz, the BP filter at 3.1 MHz and a mixer frequency
of 2.5 MHz. The dither and Pedof probe inputs are disabled. The number of sub-test, with identical
setup, is by default, eight. For the I/Q- symmetry test, the DC-component and RMS value for both the I-
and Q-part of the data set are measured. The symmetry quality measurement for this test is calculated
from the RMS values for each sub-test.
Are the probes connected? The test will run with probes connected to the scanner, but it is
recommended to disconnect all probes before running diagnostics.
Run time: 00:05
1.) Verify the following tests pass:
-
-
If these tests pass, and the GRX aCW IQ Symmetry test fails:
2.) Replace the CW GRX board.
Name: Service Diagnostics / Analog CW / GRX aCW Mixer Clock Sync
For the Mixer Clock Sync test, a signal is set up with f0=2.521 MHz, the BP filter at 3.1 MHz and a mixer
frequency of 2.5 MHz. The dither and Pedof probe inputs are disabled. The test enables one channel
pair, plus each of the other channel pairs per sub test, one at the time. The parameters to test for are
fdop, spectrum peak, RMS and SNR on the I-data.
Are the probes connected? The test will run with probes connected to the scanner, but it is
recommended to disconnect all probes before running diagnostics.
Run Time: 00:05
1.) Verify the following tests pass:
-
-
If these tests pass, and the GRX aCW Mixer Clock Sync test fails:
2.) Replace the CW GRX board.
Name: Service Diagnostics / Analog CW / GRX aCW BP Filter / Mixer Clk
In the Band Pass Filter / Mixer Clock Test, for each channel pair, a signal is set up with combinations of
input signal frequency, Band Pass (BP) filters and mixer frequencies. The dither and Pedof probe inputs
are disabled. The Doppler channel pairs are measured for the parameters: fdop, spectrum peak, RMS
on I-data.
Are the probes connected? The test will run with probes connected to the scanner, but it is
recommended to disconnect all probes before running diagnostics.
Run Time: 00:08
1.) Verify the following tests pass:
-
-
If these tests pass, and the GRX aCW BP Filter / Mixer Clk test fails:
2.) Replace the CW GRX board.
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EV
GFI Tests
Analog Receive Tests
GFI Tests
Analog Receive Tests
GFI Tests
Analog Receive Tests
Chapter 7 Diagnostics/Troubleshooting
LOGIQ E9 S M
ERVICE ANUAL
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