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737-300/400/500MAINTENANCE MANUAL
 (2)  Access Door
 1103L Forward Access Door

 D.  Procedure
 (1)  Prepare for the weather radar system trouble shooting:
 (a)  Supply electrical power (Ref 24-22-00/201).
 CAUTION: MAKE SURE THE EQUIPMENT COOLING SYSTEM OPERATES BEFORE THE
_______ ELECTRONIC SYSTEMS ARE OPERATED. THE EQUIPMENT COOLING SYSTEM MUST BE SET FOR CORRECT COOLING. IF THESE CAUTIONS ARE NOT OBEYED, DAMAGE TO THE ELETRONIC SYSTEMS CAN OCCUR.
 (b)  
Supply equipment cooling (Ref 21-58-00/501).

 (c)  
Open the forward access door 1103L to get access to the weather radar receiver/transmitter(Ref 12-31-11/201).

 (d)  
Close these circuit breakers:

 1)  P6 Load Control Center - Right
 a) WEATHER RADAR R/T
 b) F/O RDDMI
 c) INST XFMR-2
 d) EFIS SYM GEN R
 e) EFIS CONTROL PANEL R
 f) EHSI
 g) DAA NO.2 FMC AC
 h) DAA NO.2 IRS AC
 i) DAA NO.2 DC
 j) IRS NO.2 AC
 k) IRS NO.2 DC
 l) DAA FMC NO.2
 m) AUTO FLIGHT CONTROL SYS B

 2)  P18 Load Control Center -Left
 a) AUTO FLIGHT CONTROL SYS A

 (e)  Align the inertial reference system in the NAV mode (Ref 34-28-01/201). 1) Make sure the ATT flags on the captain's and the first
 officer's EHSIs are not in view.
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 (f)  
Set the switches and controls on the WXR control panel as follows: 1) MAP switch - On 2) GAIN - CAL 3) IDNT - Off 4) TILT - 0° 5) STAB - On

 (g)  
Set the controls on the captain's and the first officer's EFIS control panel as follows: 1) BRT control - Mid-scale 2) RANGE switch - 40 3) Mode selector switch - EXP VOR/ILS 4) WXR power switch - OFF (Pushed)

 (2)  Do the weather radar trouble shooting (Fig. 101):
 (a)  
Push the WXR power switch on the captain's and the first officer's EFIS control panels to the ON position.

 (b)  
Set the TEST switch on the WXR control panel to the on position. 1) Make sure the antenna does a left-to-right scan and an

 up-to-down cycle before it stops at zero degrees tilt. 2) Make sure the R/T mount blower comes on. 3) Make sure the test pattern shows on each EHSI in one 180
 degree scan of the antenna. (Fig. 101): 4) A WXR TEST message shows. 5) Make sure the test pattern on the EHSIs is as follows.
 a) The green band shows at the bottom. b) The yellow band shows above the green band. c) The red band shows above the yellow band. d) A magenta wedge is in the center and each side.
 6)  If failures occur: one or more messages will show on the EHSIs ( See Fig. 101).
 NOTE: For some failures you will not see a test
____
 pattern.

 a) A WXR FAIL message.
 b) An LRU failure message of RT, ANT, CONT, ATT, OR WEAK.

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 7)  If the EHSIs have failure message(s) or the display is unsatisfactory, continue failure isolation with Fig. 102.
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737-300/400/500
MAINTENANCE MANUAL
　
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