33-15-00
 ALL  ú ú 01 Page 105 ú Jul 15/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 MASTER WARNING AND CAUTION LIGHTS - MAINTENANCE PRACTICES
_________________________________________________________
 1.  General_______
 A.  This procedure contains a task for the replacement of the master caution annunciator lights.
 B.  There is a master caution annunciator installed on each side of the pilots' light shield, P7.
 C.  The lamps are installed in a housing assembly. You remove the housing assembly from the annunciator assembly to get access to the lamps. The annunciator assembly stays installed in the P7 panel.
 D.  Refer to the System Schematic Manual (SSM) or the Wiring Diagram Manual (WDM) to identify which annunciator lights come on when you do a test.
 TASK 33-15-00-432-001
 2.  Master Warning and Caution Lights - Lamp Replacement (Fig. 201)____________________________________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
SSM 33-18-20

 (3)  
WDM 33-18-21

 B.  Access
 (1)  Location Zone
 101 Control Cabin - Left
 102 Control Cabin - Right

 C.  Procedure
 S 862-021
 (1)  Prepare for the replacement of the annunciator lamp:
 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Close the applicable circuit breakers.

 NOTE: Refer to the SSM or the WDM for the affected system.
____
 (c)  
Push and hold down the right or the left annunciator faceplate.

 (d)  
Examine the lights of the annunciator to see which of the lights are not on.

 (e)  
Release the annunciator faceplate.

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 33-15-00
 ALL  ú ú 02 Page 201 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
COURSE  A/T 
ARM 
FIRE  MASTER 
WARN  CAUTION 
BELL CUTOUT  PUSH TO RESET  F/D 
ON  OFF 
FLT CONT  ELEC 
IRS  APU  N1 
OFF 
FUEL  OVHT/DET 
ANNUNCIATOR 
SEE  A 
MASTER CAUTION ANNUNCIATOR 
(EXAMPLE OF LEFT SIDE) 

MASTER  FIRE 
CAUTION  WARN 
PUSH TO RESET  BELL CUTOUT 
ANTI-ICE  ENG 
HYD  OVERHEAD 
DOORS  AIR COND 
ANNUNCIATOR 
SEE  A 

MASTER CAUTION ANNUNCIATOR (EXAMPLE OF RIGHT SIDE)
LAMP
ANNUNCIATOR ASSEMBLY
LAMP HOUSING
FACEPLATE
ANNUNCIATOR A
Master Caution Annunciator Lamp Replacement Figure 201
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-15-00
 ALL  ú ú 01 Page 202 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 962-022
 (2)  Replace the annunciator lamp:
 (a)  Open the applicable circuit breakers and attach DO-NOT-CLOSE tags.
 NOTE: Refer to the SSM or the WDM for the affected system.
____
 CAUTION: REMOVE THE LAMP HOUSING ASSEMBLY WITH YOUR FINGERS ONLY.
_______ IF YOU USE A TOOL TO HOLD THE LAMP HOUSING ASSEMBLY YOU CAN DAMAGE IT.
 (b)  
Hold the lamp housing assembly with the thumb and the finger and pull it from the annunciator assembly.

 (c)  
Hold the rear of the lamp with the thumb and the finger.

 (d)  
Remove the defective lamp.

 (e)  
Put the replacement lamp into the lamp housing assembly.

 (f)  
Turn the lamp housing assembly until the faceplate is away from the pilots' P7 panel.

 (g)  
Put the lamp housing assembly into the annunciator assembly.
　
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