(2)
RANGE - Set to maximum range shown on test pattern (Fig. 101).
(3)
INTENSITY control - full ccw
(4)
INT - full CW
(5)
AZ1M MKS pushbutton - off
E. Provide electrical power. (Ref 24-22-00, Manual Control - Maintenance Practices (Apply Power)).
F. Close WEA RAD R/T 1, R/T 2, IND 1, and IND 2 circuit breakers.
G. Provide equipment cooling. (Ref 21-58-00, Equipment Cooling -Adjustment/Test (Operational Test).
H. Turn on INS and erect to at least coarse align status (Ref 34-41-00, INS Adjustment/Test (Operational Test)).
I. The test pattern actuated by selecting the TEST mode on the pilots' weather radar control panel is shown in Fig. 101. Refer to microwave precautions in Prepare for Trouble Shooting Procedures.
EFFECTIVITY
AF 101-120, 123-156, 158,
159, 172-182, 185-199; SN 301-350; IB 405; GN ALL; CONFIG MD ALL; VM ALL 02 C Page 103
Sep 25/94
34-43-00
100-MILE RANGE MARK
IN BRIGHT BAND
BRIGHT BAND
DUE TO VIDEO IS0-CONTOUR TEST BAND
TEST SIGNAL (NORMALLY DARK)
90 MILES
DARK BAND 75-MILE RANGE
LIGHTLY MARK BARELY
SPOTTED VISIBLE IN
WITH NOISE BRIGHT BAND
50-MILE
RANGE MARK
25-MILE NOISE SIGNAL MAXIMUM
RANGE MARK AT APPROX 60 MILES
DECREASING EXPONENTIALLY
TO A MINIMUM OF APPROX
30 MILES
Self Test Display
Figure 101
EFFECTIVITY
AF 101-120,123-156,158,159, CONFIG 2172-182,185-199; SN 301-350; 799C Page 104
34-43-00IB 405; GN ALL; MD ALL; VM ALL Sep 25/94
808856
WARNING: THIS TEST IS ACCOMPLISHED WITH THE "TEST" (NON-RADIATING) MODE SELECTED ON THE WEATHER RADAR CONTROL PANEL. DO NOT SELECT OTHER OPERATING MODES UNLESS THE "GND (GROUND) TEST/NORMAL" SWITCH IS IN "GND (GROUND) TEST" POSITION, OR ALL OTHER CONDITIONS ARE SAFE FOR TRANSMITTING FROM THE RADAR ANTENNA. REFER TO PRECAUTIONS IN PAR. 2.
At control panel select R/T 1, GAIN in NORMAL, and select TEST mode. Observe that R/T and ANT fault lamps on control panel come on. IF -
T35131
EFFECTIVITYAF 101-120,123-156,158,159,
CONFIG 2 172-182,185-199; SN 301-350; 799C Page 105
IB 405; GN ALL; MD ALL; VM ALL Sep 25/94
34-43-00
NOT OK
OK Vary RANGE setting on each indicator and verify that range marks configuration displayed is as follows:
RANGE LOCATION OF R/M DISPLAYED_________________________ ____________________
_____ NO. OF R/M DISPLAYED 30
25 1
100 25,50,75,100 4
300 50,100,150,200,250,300 6
IF -
Check that test pattern on each indicator conforms to Fig. 101. Select system 2 at control panel and observe test pattern on each indicator. IF -
EFFECTIVITY
CONFIG 2
AF 101-120,123-156,158,159,
799C Page 106
172-182,185-199; SN 301-350;
34-43-00
Sep 25/94
IB 405; GN ALL; MD ALL; VM ALL Press and hold ROLL STABILIZATION TEST switch on R/T-1 for 45 seconds and observe that R/T and ANT stabilization test lamps do not remain on. IF -
SYSTEM IS OK - If gain of system is questioned or if the transmission/reception is questioned the system test may be used to troubleshoot further.
T35135
EFFECTIVITYAF 101-120,123-156,158,159,
CONFIG 2 172-182,185-199; SN 301-350; 799C Page 107IB 405; GN ALL; MD ALL; VM ALL Sep 25/94
34-43-00
PROCEDURE 1
PROCEDURE 2
T35137
EFFECTIVITYAF 101-120,123-156,158,159,
CONFIG 2 172-182,185-199; SN 301-350; 799C Page 108IB 405; GN ALL; MD ALL; VM ALL Sep 25/94
34-43-00
J. When warmup period in standby mode is completed, select TEST mode. A test pattern should appear on the indicators in less than a minute and will be suitable for control adjustment for comparison to Fig. 101 in approximately a minute.
K. Set all intensity, brilliance, or brightness controls on the indicators to mid-position, then follow procedures in the troubleshooting chart to attain proper indications on the test pattern and to isolate malfunctions.
L. Use the following information in association with the procedures in the trouble shooting chart when the test pattern is observed. Also, selecting the alternate system when a trouble is encountered in the system in use will aid confirmation of faults to a particular LRU.
(1)
Absence of the far targetsd may indicate a poor VSWR in the antenna and waveguide components. Make a visual check of these components for physical damage and/or perform VSWR test to confirm high VSWR when troubleshooting procedures in chart do not reveal malfunctioning LRU.
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