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737-300/400/500MAINTENANCE MANUAL
(d) Close these circuit breakers:
1) P6 Load Control Center - Right
a) WEATHER RADAR R/T
b) WEATHER RADAR AC
c) F/O RDDMI
d) INST XFMR-2
e) DAA NO.2 FMC AC
f) DAA NO.2 IRS AC
g) DAA NO.2 DC
h) IRS NO.2 AC
i) IRS NO.2 DC
j) DAA FMC NO.2
k) AUTO FLIGHT CONTROL SYS B
2) P18 Load Control Center -Left
a) AUTO FLIGHT CONTROL SYS A
(e) Align the left, right and center inertial reference units in the NAV mode (Ref 34-28-01/201). 1) Make sure the ATT flags on the captain's and the first
officer's ADIs are not in view.
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A 737-300/400/500MAINTENANCE MANUAL
(f) Set the controls and switches on the WXR indicator as follows: 1) STBY mode selector - Depressed. Allow a one
minute warmup period. 2) AZIM switch/indicator - Off 3) SEC SCAN switch/indicator - Off 4) FRZ switch/indicator - Off 5) TGT ALRT switch/indicator - Off 6) GAIN - PRE-SET 7) STAB - OFF 8) TILT - 0 Degrees 9) INT - Middle position 10) RANGE - TEST
(2) Do the weather radar trouble shooting (Fig. 101):
(a)
Push the WX or MAP mode selector on the WXR indicator.
(b)
If the weather radar system is OK a test pattern on the WXR indicator will show like Fig. 101.
(c)
If the test pattern is not OK use the test pattern in Fig. 101 and the trouble shooting charts in Fig. 102.
(d)
Use the data that follows with the trouble shooting charts in Fig. 102 to trouble shoot the weather radar in the TEST, WX, MAP, or CYC modes. 1) When there are no far targets in the WX or MAP modes the
malfunction may be as follows:
a) Unserviceable R/T.
b) High VSWR in the antenna.
c) High VSWR in the waveguide sections.
1. Do a visual check of the waveguide when the trouble
_ shooting charts do not find the unserviceable LRU. 2) Incorrect or missing middle range targets show that the R/T is unserviceable.
3) When the near range targets do not show on the WXR indicator one of these occured: a) A failure in the stabilization circuits in the antenna. b) A failure in the stabililzation circuits in the R/T. c) An unserviceable inertial reference system (Ref
34-28-00).
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737-300/400/500MAINTENANCE MANUAL
BAND NOISE WINDOW ALERT TARGET SET` 30` PRE CYCWXSTBYOFF ONOFF GAIN RANGE 10 25 50 TEST 300 100 200 0 AZIM A MAP INT 1 2 3 100 30` TILT 10 5 0 5 10 -15 +15 F FRZ GREEN YELLOW RED
60` 60`
MARKS RANGE S SCAN SEC TEST 20 40 60 80 ALRT T TGT
WEATHER TEST MODE
BAND NOISE WINDOW ALERT TARGET A 10 25 50 ON 0 WX SET` 30` PRE CYCSTBYOFF OFF GAIN RANGE TEST 300 100 200 AZIM MAP INT 1 2 3 10 5 0 5 10 100 30` TILT F -15 +15 FRZ MAGENTA CYAN YELLOW
60` 60`
MARKS RANGE S SCAN SEC TEST 20 40 60 80 T ALRT TGT
MAP TEST MODE
Weather Radar Test Pattern Displays Figure 101
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