![]() 737-600/700/800/900 Fault Isolation Manual 故障隔离手册 |
804.
Control Display Unit Blanks - Fault Isolation |
A. Description 一个。 描述 |
(1)
The captain's or first officer's control display unit (CDU) screen is blank. |
B.
Possible Causes |
(1)
Control display unit (CDU), P9-65 (captain's) or P9-66 (first officer's). |
(2)
No power to the CDU. |
C.
Circuit Breakers |
(1)
These are the primary circuit breakers related to the fault: |
CAPT Electrical System Panel, P18-2 |
|
GL3 ALL GL3 全部 |
F/O Electrical System Panel, P6-1 |
|
GL3 ALL GL3 全部 |
D.
Related Data |
(1) (SSM 34-61-11). (1) ( SSM 34-61-11). |
(2) (WDM 34-61-11). (2) ( WDM 34-61-11). |
E.
Initial Evaluation |
(1)
Do this check of the control display unit (CDU): |
GL3 200, 203-999; GL3 201, 202 POST SB 737-34-2000 OR POST SB 737-34-4018; AIRPLANES WITH DUAL FMC |
(a)
Set the FMCS transfer switch to the NORMAL position. |
GL3 ALL GL3 全部 |
(b)
Open these circuit breakers: |
CAPT Electrical System Panel, P18-2 |
|
GL3 ALL GL3 全部 |
F/O Electrical System Panel, P6-1 |
|
GL3 ALL GL3 全部 |
NOTE:
These circuit breakers must be opened for at least 10 seconds before you continue. |
(c)
Remove the safety tags and close these circuit breakers: |
CAPT Electrical System Panel, P18-2 |
|
GL3 ALL GL3 全部 |
F/O Electrical System Panel, P6-1 |
|
GL3 203-999 GL3 203-999型 |
(f)
After 20 seconds, make sure the display unit shows the FMC prompt on the Menu page. |
(g)
If the Menu page is not shown, then do the Fault Isolation Procedure below. |
GL3 ALL GL3 全部 |
F.
Fault Isolation Procedure |
(1)
Do this exchange of the CDUs: |
(a)
Put a tag that reads "SUSPECT" on the CDU that does not operate. |
(b)
Put a tag that reads "OK" on the CDU that operates. |
(c)
Exchange the locations of CDU 1, P9-65, and CDU 2, P9-66. |
These are the tasks: |
FMCS Control Display Unit (CDU) Removal, AMM TASK 34-61-01-000-802, |
FMCS Control Display Unit (CDU) - Installation, AMM TASK 34-61-01-400-802. |
(d)
If the CDU labeled "SUSPECT" is blank in its new location, then replace the CDU. |
These are the tasks: |
FMCS Control Display Unit (CDU) Removal, AMM TASK 34-61-01-000-802, |
FMCS Control Display Unit (CDU) - Installation, AMM TASK 34-61-01-400-802. |
NOTE:
If it is your airline's policy, you must return the CDU tagged "OK" to its original location. |
1)
Do the Repair Confirmation at the end of this task. |
a)
If the Repair Confirmation is OK, then you corrected the fault. |
b)
Remove the tags from the CDUs. |
(e)
If the CDU labeled "OK" is blank in its new location, then continue. |
(2)
Do this check for electrical power to the CDU: |
(a)
Remove the CDU labeled "OK". To remove it, do this task: FMCS Control Display Unit (CDU) Removal, AMM TASK 34-61-01-000-802. |
(b)
Do a check for 115V AC power between pins 30 and 31 of connector D2181 for the captain's CDU, or connector D2221 for the first officer's CDU. |
(c)
If there is not 115V AC, then do these steps: |
1)
Repair the wiring. |
2)
Re-install the CDU. To install it, do this task: FMCS Control Display Unit (CDU) - Installation, AMM TASK 34-61-01-400-802. |
3)
Do the Repair Confirmation at the end of this task. |
G.
Repair Confirmation |
(1)
Do this check of the control display unit (CDU): |
GL3 200, 203-999; GL3 201, 202 POST SB 737-34-2000 OR POST SB 737-34-4018; AIRPLANES WITH DUAL FMC |
(a)
Set the FMCS transfer switch to the NORMAL position. |
GL3 ALL GL3 全部 |
(b)
Open these circuit breakers: |
CAPT Electrical System Panel, P18-2 |
|
GL3 ALL GL3 全部 |
F/O Electrical System Panel, P6-1 |
|
GL3 ALL GL3 全部 |
This circuit breaker is inoperative and should remain open: |
F/O Electrical System Panel, P6-1 |
|
GL3 ALL GL3 全部 |
NOTE:
These circuit breakers must be opened for at least 10 seconds before you continue. |
(c)
Close these circuit breakers: |
CAPT Electrical System Panel, P18-2 |
|
GL3 ALL GL3 全部 |
F/O Electrical System Panel, P6-1 |
|
GL3 ALL GL3 全部 |
This circuit breaker is inoperative and should remain open: |
F/O Electrical System Panel, P6-1 |
|
GL3 203-999 GL3 203-999型 |
(e)
After 20 seconds, make sure the display unit shows the FMC prompt on the Menu page. |
(f)
Push the LSK adjacent to the FMC prompt and make sure the IDENT 1/x page is shown on the display unit. |
GL3 ALL GL3 全部 |
(g)
If the IDENT 1/x page shows on the CDU, then you corrected the fault. |