Analog Cw - Board Tested/Required Matrix For Diagnostics - GE LOGIQ E9 Service Manual

D 5180483-100, R
IRECTION
Table 7-35
Line
4
5
6
Line
1
2
3
4
5
6
PROPRIETARY TO GE
. 7
EV
Analog CW
Name:
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
MRX aCW BP
measured for the parameters: fdop, spectrum peak, RMS on I-
Filter / Mixer Clk
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.
For the Low Pass Filter test, Doppler test frequencies, both in the
filter pass band and the stop band are set up. The mixer clock
frequency is set to 2.5 MHz and the band pass filter to 3.1 MHz.
The dither and Pedof inputs are disabled. The LP-filter 3 dB
MRX aCW frequency will typically be at about 40 kHz. The following
Doppler LPF parameters are tested: fdop, spectrum peak and RMS both in the
I- and Q-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.
In the test, the two center frequencies of 2 MHz and 6 MHz are
verified. These frequencies are set by switching the Pedof band
pass filter. The MRX test signal generator is used to input sine
waves. The Pedof test signal input is enabled. The dither and
Pedof probe inputs are disabled. Sub tests using combinations of
input signal frequency, Pedof band p ass filter settings, mixer clock
MRX aCW Pedof frequency, test signal gain, and IQ gains are run.
Parameters tested: fdop, spectrum peak, RMS, SNR and THD on
both I- & Q-data. With this test the Pedof (SD probe) CW path on
the MRX Board is tested.
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.
Table 7-36

Analog CW - Board Tested/Required Matrix for Diagnostics

"GTX
GRLY MRX (slot2)
T T
T T
T T T
T T T
T T T
T T T
Chapter 7 Diagnostics/Troubleshooting
Description:
FRU - T = Tested / R = Required
"GTX "GTX
(slot3)" (slot4)" PD Processor
R
R
T T R
T T
T T
T T R
LOGIQ E9 P
ROPRIETARY
Run Time:
00:08
00:05
00:05
"Front
Plane
Upper FREY
Back End and Back
Lower" Plane
R R R
R R R
R R R
R R R
S M
ERVICE ANUAL
If this test
failed:
Replace the
MRX Board.
Replace the
MRX Board.
Replace the
MRX Board.
"Main
"Fan Power
Tray" Supply"
R
R
R
R
7 - 107