(b)  
Remove the HUD computer. To remove it, do this task: HUD Computer Removal, AMM TASK 34-36-01-000-801.

(c)  
Do a check for an open circuit between these pins of the HUD annunciator panel, connector D3207, and the HUD computer, connector D3281A:

EFFECTIVITY SIL 004, 005, 017, 018  34-36 TASKS 810-854 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 210 Jun 15/2010 

1)
D3207  D3281A
Pin14 -----------------PinF9

(d)  
Re-install the HUD computer. To re-install it, do this task: HUD Computer Installation, AMM TASK 34-36-01-400-801

(e)  
Re-install the HUD annunciator panel. To re-install it, do this task: HUD Annunciator Panel Installation, AMM TASK 34-36-06-400-803-002.

(f)  
Do the Repair Confirmation.

G. Repair Confirmation
(1)  Do
this
check
of
the
HUD
annunciator
panel:
Head
Up
Display
BITE
Procedure,
34-36
TASK
801.

(a)  If the HAP C1 fault code on the HUD control panel (fault code C1 on the combiner) does not show, then you corrected the fault.
-------------------------END OF TASK ---------------------------
811. Combiner Alignment -Fault Isolation
A. Description
(1)  This task is for this maintenance message:
(a)  ALIGNHUD with OHU60/70 fault codes.
B. Probable Causes
(1)  
HUD Combiner

(2)  
OHU

EFFECTIVITY SIL 004, 005, 017, 018  34-36 TASK 811 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 211 Jun 15/2010 

C.  Circuit Breakers
(1)  
These are the primary circuit breakers related to the fault: CAPT Electrical System Panel, P18-2

(1)  
Do
this
task:Head
Up
Display
BITE
Procedure,
34-36
TASK
801

(a)  
If the HUD fault code shows on the control panel, then do the Fault Isolation Procedure.

(b)  
If the HUD fault code does not show, then there was an intermittent fault.

Row  Col  Number  Name 
C  1  C01622  HEAD UP DISPLAY ANNUN DC 
C  2  C01618  HEAD UP DISPLAY CONT PNL DC 
C  5  C01619  HEAD UP DISPLAY SYS NORMAL DC 
C  6  C01620  HEAD UP DISPLAY SYS ALTN DC 
D. Related Data 
(1)  SSM 34-36 
(2)  SSM 34-36-11 
(3)  SSM 34-36-12 
(4)  WDM 34-36 
(5)  WDM 34-36-11 
(6)  WDM 34-36-12 
E. Initial Evaluation 

F.  Fault Isolation Procedure
(1)  
Make sure that the combiner is in the correct position (not breakaway).

(2)  
Make sure that no aircraft structure, trim panels, curtain rods and other components hit or touch the combiner.

(3)  
Push the Combiner glass forward and let it move back to the detent position.

(a)  Make sure no message is shown.

(4)  
If ALIGNHUD continue to show, go to the next step.

(5)
Open the circuit breakers on the Circuit Breaker List.

(6)  
Disconnect the OHU to the Combiner harness connector D 3193.

(7)  
Close the circuit breakers on the Circuit Breaker List.

(8)  
If only the ALIGNHUD display shows, remove and replace the combiner.

(9)
Replace the HUD Combiner. These are the tasks: AMM TASK 34-36-04-000-801 AMM TASK 34-36-04-400-801
　
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