(a)  
If the test in the installation task for the standby magnetic compass is satisfactory, then you corrected the fault.

(b)  
If the test in the installation task for the standby magnetic compass is not satisfactory, then continue.

(2)  
Do a voltage check of the standby compass indicator:

(a)  
Set the compass light switch to off.

(b)  
Remove the standby compass indicator. To remove it, do this task:Standby Magnetic Compass Removal, AMM TASK 34-23-01-000-801.

(c)  
Set the compass light switch to ON and BRIGHT.

(d)  
Make sure that 28vdc is present at pin A1 of connector D918.

(e)  
Set the compass light switch to DIM.

(f)  
Make sure that 14vdc is present at pin A1 of connector D918.

(g)  
Set the compass light switch to OFF.

(h)  
Make sure the outer ring (connector shell) of the D918 connector has continuity to ground.

(i)  
If the D918 connector shell does not have continuity to ground, then do these steps: 1) Do a check of the GD264 and make sure the wire W2508–2002B-20 is properly inserted into the ground block.

2)  If the wire W2508–2002B-20 is properly connected, then do these steps: a) Do a continuity check between D918 connector and GD264. b) If there is continuity between D918 connector and GD264, then do these steps:
<1> Install a new standby compass indicator. To install it, do this task: Standby Magnetic Compass Installation, AMM TASK 34-23-01-400-801.
c)  If there is no continuity between D918 connector and GD26, then do these steps:
<1> Repair the wiring.
<2> Do the Repair Confirmation Procedure below.
3)  If the wire W2508–2002B-20 is not properly connected, then do these steps: a) Repair the wiring. b) Do the Repair Confirmation Procedure below.
(j)  If the D918 connector shell has continuity, then do these steps:
EFFECTIVITY SIL ALL  34-23 TASK 802 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 202 Feb 15/2009 

2)  Do the Repair Confirmation Procedure below.
F.  Repair Confirmation Procedure
(1) Set the compass light switch to ON and then to BRIGHT.
(a) Make sure the standby magnetic compass lights are on and bright.
-------------------------END OF TASK ---------------------------
EFFECTIVITY SIL ALL  34-23 TASK 802 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 203 Feb 15/2009 

804.  Integrated Standby Flight Display Blank -Fault Isolation
A. Description
(1) The integrated standby flight display (ISFD) is blank.
B. Possible Causes
(1)
Power loss.

(2)
Integrated standby flight display, N226.

(3)
ISFD dedicated battery system, M2100.

C. Circuit Breakers
(1) This is the primary circuit breaker related to the fault:
CAPT Electrical System Panel, P18-2
Row Col Number Name
D 8 C01551 ISFD

SIL 001-004, 006, 007, 009-013, 016-019, 021, 101
(a)  Front of the ISFD Dedicated Battery System, M2100, E1-3
1) DBC Output breaker

SIL 005, 008, 014, 015, 020, 102-999
(b)  Front of the ISFD Dedicated Battery System, M2100, E4–1
1) DBC Output breaker

SIL ALL
D. Related Data
(1)
(SSM 34-24-15).

(2)
(WDM 34-24-15).

E. Initial Evaluation
(1) Make sure that this circuit breaker is closed:
CAPT Electrical System Panel, P18-2
Row Col Number Name
　
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