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737-300/400/500MAINTENANCE MANUAL 
TARGET ALERT WINDOW TARGET ALERT FIELD  A AZIM 0 200100 300 TEST 50 25 10 RANGE GAIN OFF ON OFF STBY WX CYC PRE 30` SET`  INT MAP  1 2 3 10 5 0 5 10 TILT 30`  FRZ F +15 -15  GREEN YELLOW RED 
NOISE BAND  60`  100  60` 
SEC  80  TGT 
RANGE MARKS  SCAN S  TEST  20  40  60  T ALRT 
WEATHER MODE 
TARGET ALERT WINDOW  200100 300 TEST RANGE GAIN OFF OFF STBY CYC PRE 30` SET` WX 0 ON 50 25 10  INT MAP  1 2 3 TILT 30` 10 5 0 5 10  +15 -15  CYAN YELLOW MAGENTA 
AZIM  FRZ 
NOISE BAND  A  100  F 
60`  60` 
SEC  80  TGT 
RANGE MARKS  SCAN S  TEST  20  40  60  ALRT T 
MAP MODE 

Weather Radar Test Modes
Figure 5

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737-300/400/500MAINTENANCE MANUAL
 WARNING:_______ THE TARGET ALERT FUNCTION IS NOT TO BE USED AS THE
 PRIME SOURCE FOR STORM, TERRAIN, OR OTHER OBJECT
 AVOIDANCE.

 11) TGT ALRT (target alert) pushbutton - When pressed, the target alert mode is activated and is indicated by the letter T in a red rectangle on the upper left corner of the indicator display. If a contourable target (red indication at a preset gain) occurs in the target alert window 75 to 150 NM range and 15 degrees left or right of dead ahead, a TGT alert label (Fig. 4) in a red rectangle will be flashed on and off at 1/2 second intervals on the indicator display.
 12) INT (intensity) control knob - Varies the intensity of video on the display.
 13) GAIN control knob - In PRESET (detented) position, sets the level of the IF and video amplifiers to a level based on the receiver noise level. This level is automatically utilized when CYC and TEST modes are selected. The variable gain manual (out-of-detent) position is operable only in WX and MAP modes. Receiver noise on the display should increase when the GAIN control is rotated clockwise.
 14) AZIM (azimuth marker) pushbutton - When activated, displays
 azimuth strobe lines 30 degrees apart.The indicator also contains circuitry for generating alphanumerics used to display information on the CRT screen. The different types of indications are as follows: 1) Mode field - Appears on lower left corner of display.
 Selected mode is displayed as STBY, WX, or MAP. PUSH is displayed when an "all buttons out" condition exists. WAIT is displayed if indicator is synchronizing with antenna or during warm-up. TEST is displayed when RANGE selector is in test position, but is overridden by STBY, WAIT, or PUSH modes. ANT is displayed as a blinking word when the antenna is not sweeping because of an antenna failure.
 2)  Sub-mode field - Appears just above mode field in lower left corner of display. FRZ is displayed as a blinking word when freeze control is activated, but is blanked out in STBY, WAIT, or PUSH mode. VAR is displayed if GAIN control is out of PRESET position. VAR is overridden by FRZ.
 3)  Target field - Appears in upper left corner of display when TGT ALRT is selected. The letter(s) T or TGT will be displayed in a red rectangle.
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 4)  Auxiliary field - Displays color bar legend and level numbers: 1, 2, and 3 on upper right corner. In weather mode, colors are green, yellow, and red; and in map mode, colors are cyan, yellow, and magenta.
 5)  Range mark identifiers - Five labelled range mark identifiers are displayed in cyan for WX and green for MAP.
 D.  System shutdown procedures
 (1)  Perform in the sequence.
 (a)  
　
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