R . repair the above wiring.
R - if there is continuity:

R . replace the CTL UNIT-WEATHER RADAR (3SQ) (Ref. AMM TASK
R 34-41-12-000-001) and (Ref. AMM TASK 34-41-12-400-001).
R - If the fault continues:

R . replace the MTG TRAY-WR XCVR (9SQ) (Ref. AMM TASK 34-R 41-37-000-001) and (Ref. AMM TASK 34-41-37-400-001).

R (b) If the weather radar system 2 is set:
R - replace the XCVR-WEATHER RADAR, 2 (1SQ2) (Ref. AMM TASK 34-41-R 33-000-004) and (Ref. AMM TASK 34-41-33-400-003).

R 1_ If the fault continues:
R - do a check of the wiring of the TR2 DATA BUS 1 OUTPUT and
R the TR2 DATA BUS 2 OUTPUT buses from the weather radar
R transceiver 2 (1SQ2) to the first terminal block (Ref. ASM
R 34-41/01).

R a_ If there is no continuity:
R - repair the above wiring.

R b_ If there is continuity:
R - do a check of the wiring of the weather radar control
R unit (3SQ):
R from pin B/G to the first terminal block
R from pin B/A to the ground point

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, ∞∞34-41-00∞∞∞∞∞∞∞∞∞∞Page 209
 May 01/05 CES

R  from pins B/K, L, M to the weather radar transceiver 2 
R  (1SQ2), pins AB/6C, 6D, 7D 
R  from pin B/V to the weather radar transceiver 2 (1SQ2), 
R  pin AB/6B 
R  (Ref. ASM 34-41/01). 
R  - If there is no continuity: 
R  . repair the above wiring. 
R  - If there is continuity: 
R  . do a check of the wiring of the weather radar 
R  transceiver mounting tray (9SQ) : 
R  * from pins A/A and A/E to the control unit (3SQ), pins 
R  A/D and A/E. 
R  * from pin A/B to the ground point. 
R  * from pin A/D to the weather radar transceiver 2 (1SQ2), 
R  pin AB/8D. 
R  (Ref. ASM 34-41/01). 
R  - if there is no continuity: 
R  . repair the above wiring. 
R  - if there is continuity: 
R  . replace the CTL UNIT-WEATHER RADAR (3SQ) (Ref. AMM TASK 
R  34-41-12-000-001) and (Ref. AMM TASK 34-41-12-400-001). 
R  - If the fault continues: 
R  . replace the MTG TRAY-WR XCVR (9SQ) (Ref. AMM TASK 34-
R  41-37-000-001) and (Ref. AMM TASK 34-41-37-400-001). 
R  - If the radar system trouble shooting is unsatisfactory, 
R  replace RADOME (1560WM) (Ref. AMM TASK 53-15-11-000-001) 
R  and (Ref. AMM TASK 53-15-11-400-001). 
R  **ON A/C ALL
 D. Do the test given in Para. 3.

 Failure of the Weather Radar Transceiver 1
 1. Possible Causes
_______________
 - XCVR-WEATHER RADAR, 1 (1SQ1)

 - wave guide switch

 - short to ground at the wiring between the circuit breaker (5SQ1) and the weather radar transceiver 1 (1SQ1).

 - C/B-COM NAV/RADAR/1

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 34-41-00-730-001 System Test of the Weather Radar
 AMM 34-41-00-740-002 BITE Test of the Weather Radar
 AMM 34-41-33-000-004 Removal of the Weather Radar Transceiver (1SQ1, 1SQ2)
 AMM 34-41-33-400-003 Installation of the Weather Radar Transceiver (1SQ1,

 1SQ2)
 ASM 34-41/01

 3. Fault Confirmation
__________________
 A. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU COM NAV/RADAR/1 5SQ1 K13
 B. Test
 (1) If the circuit breaker (5SQ1) trips, refer to Para. 4. D. of this trouble shooting procedure.

 (2) Do the BITE test of the weather radar (Ref. AMM TASK 34-41-00-740-002).

 - If the BITE test is not possible, refer to Para. 4. C. of this trouble shooting procedure.
 4. Fault Isolation
_______________
 A. If the circuit breaker (5SQ1) is closed, and if the BITE test gives the maintenance message WXR1 (1SQ1):
 - replace the XCVR-WEATHER RADAR, 1 (1SQ1) (Ref. AMM TASK 34-41-33-000-004) and (Ref. AMM TASK 34-41-33-400-003).
　
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