33-11-90
 ALL  ú ú 01 Page 401 ú Jul 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone
 101 Control Cabin - Left
 102 Control Cabin - Right

 C. Procedure
 S 424-012
 (1)  Install the lightplate.
 (a)  
Carefully connect the electrical connector to the lightplate.

 (b)  
Attach the lightplate to the panel frame with the screws.

 (c)  
If removed, install the control knobs.

 S 714-013
 (2)  Do a test of the replacement lightplate.
 (a)  
Set the switch for the replacement lightplate to the bright position. 1) Make sure the lightplate comes on brightly.

 (b)  
Set the switch to the off position.

 (c)  
Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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 33-11-90
 ALL  ú ú 01 Page 402 ú Jul 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 MASTER WARNING AND CAUTION LIGHTS - DESCRIPTION AND OPERATION
_____________________________________________________________
 1.  General_______
 A.  Two master caution lights and two system master caution annunciators provide an indication to pilot's if a system indicator light has illuminated on a pilot's instrument panel. The master caution lights and annunciator are on the P7 lightshield . One master caution light and one master caution annunciator pair is on the left; the other pair is on the right. Each master caution annunciator is composed of six sections. The six are connected to six system modules on overhead panel P5. The left master caution annunciator is also connected to P8-1 fire protection panel. Each P5 module contains logic circuits which cause the master caution light and corresponding section of the system master caution annunciator to illuminate when a system indicator light on the P5 module is turned on by the system fault detection circuit . Annunciation and dimming module M469 in the P9 control stand panel contains diodes for isolating the master caution lights from the master caution annunciators. Pressing a master caution light extinguishes all master caution lights and annunciators. Resetting the system master caution annunciator recalls the previously illuminated system master caution annunciator. The FIRE WARN lights adjacent to the master caution lights are part of the fire protection system (Ref 26-11-00), but their intensity is controlled by the BRIGHT-DIM-TEST function of the master warning and caution lights.
 B.  Power for the master caution logic circuits on the P5 modules is either from the system power source or from a DIM & TEST circuit breaker on P6-3 load control center. Two MASTER CAUTION ANNUNCIATOR circuit breakers labeled No. 1 and BAT provide a 28v dc dual power source for the master caution lights and system master caution annunciators. Three additional battery bus circuit breakers labeled AIR COND, FUEL and ANTI-ICE, under MASTER CAUTION on P6-3 load control center, provide power for the master caution logic circuits in the P5 modules.
 C.  A master dim and test circuit is connected to system indicator lights in the control cabin. A three position toggle switch labeled LIGHTS-DIM, BRT and TEST (on P2 center instrument panel) controls relays and logic circuits which cause all illuminated system indicator lights to dim or when held to TEST, causes all system indicator lights to illuminate. The switch is momentary in the TEST position . Three dim relays are energized when the switch is positioned to DIM. The relays insert zener diodes or resistances in the line and cause the voltage through the system indicator lights to be reduced. A master test relay is energized when the switch is held to TEST. The master test relay provides a ground or power as required to illuminate system indicators . Master dim and test logic circuits are in M564 master dim module and M469 annunciation and dimming module. The relays and master dim module are in P6 load control center. The annunciation and dimming module is in the P9 control stand panel.
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