(e)  
If you do not find a problem with the wiring, then continue.

1)  Re-install the Left (Right) weather radar receiver/transmitter, M101 (M460). To install it, do this task: Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801.
2)  Re-install the right LRRA, M1736. To install it, do this task: Low Range Radio Altimeter (LRRA) Receiver/Transmitter (R/T) Installation, AMM TASK 34-33-21-400-801.
SIL ALL
(7) Replace the weather radar receiver/transmitter. To replace it,
These are the tasks:

*
Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801

*
Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801

(a)  Do this task: Weather Radar (WXR) System -Operational Test, AMM TASK 34-43-00-710-802-001 or Weather Radar (WXR) System -Operational Test, AMM TASK 34-43-00-710-803-002.
1)  If the tilt code does not show then you corrected the fault.
-------------------------END OF TASK ---------------------------
808.  WXR RANGE DISAGREE Message Shows on CDS -Captain’s -Fault Isolation
A.  Description
(1)  The display electronic unit 1 (DEU-1) senses the range differences between the captain’s EFIS control panel and the weather radar receiver/transmitter (WXR).
B.  Possible Causes
(1)
Captain’s EFIS control panel, P7-1.

(2)  
Weather radar receiver/transmitter, M101.

(3)  
Left (Right) Weather radar receiver/transmitter, M101 (M460).

(4)
Display electronic unit 1, M1808.

SIL 014, 015, 020
SIL ALL
EFFECTIVITY

34-43 TASKS 807-808
SIL ALL
Page 233 D633A103-SIL Feb 15/2011

(5) Wiring.
C.  Circuit Breakers
(1)  These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-2
Row Col Number Name
D 1 C01369 DISPLAY CAPT EFIS CONT PANEL
D 5 C01359 DISPLAY DEU 1 PRI

CAPT Electrical System Panel, P18-3
Row Col Number Name

SIL 014, 015, 020
C 7 C01678 WEATHER RADAR RT RIGHT
F/O Electrical System Panel, P6-1
Row Col Number Name

SIL ALL
D 10 C01361 DISPLAY DEU 1 HOLDUP
D 13 C00120 WEATHER RADAR RT

D.  Related Data
(1) (SSM 34-41-11).
E.  Initial Evaluation
(1)  
Make sure the WXR switch on the captain’s EFIS control panel is selected.

(2)  
Make sure the CONTROL PANEL switch on the instrument switching module is set to NORMAL.

(a)  
If the WXR RANGE DISAGREE message does not show on the captain’s display, then there was an intermittent fault.

(b)  
If the WXR RANGE DISAGREE message shows on the captain’s display, then do the Fault Isolation Procedure below.

F.  Fault Isolation Procedure
(1)  For
DEU-1,
do
this
task:
CDS
BITE
Procedure,
31-62
TASK
801.

Look for any of the maintenance messages related to the LRUs that follow:

(a)  
EFIS control panel

(b)  
Weather radar

(c)  
Display electronic unit 1) If any of the above maintenance messages show, then go to the FIM task for that message. 2) If the WXR RANGE DISAGREE message does not show on the captain’s display, then

you corrected the fault. 3) If the WXR RANGE DISAGREE message shows on the captain’s display, then continue.
(2)  Do this check of the wiring between the weather radar receiver/transmitter and the captain’s DEU-1:
(a)  
Remove the weather radar receiver/transmitter, M101. To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.
　
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