(2)
Draw apart until side locking pins are retracted.
NOTE: In the collapsed position, locking pins are extended and cannot lock cap assembly into base assembly. Consequently, shaft will not actuate switches, and lamps will fail to contact energized pins in mounting base.
D. Insert cap assembly into mounting base. Push with firm continuous action until cap assembly bottoms out in base assembly. Cap assembly should collapse and locking pins engage base assembly.
NOTE: Hesitation inserting cap assembly into base assembly may cause cap to prematurely release causing unit to jam.
E. Close DIM & TEST circuit breaker on P6-3 panel.
F. Momentarily operate master dim and test LIGHTS switch to TEST position and observe that indicator lights illuminate.
G. Remove electrical power if no longer required (Ref 24-22-0).
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Indicator Light 580
33-11-82 Figure 201 Jun 20/87
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MASTER WARNING AND CAUTION LIGHTS - DESCRIPTION AND OPERATION
1. General (See figure 1.)
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 overhead panel P5 or if an overheat light has illuminated on engine and APU fire control module P8-1. 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 are on the right. Each master caution annunciator is composed of six sections. One section is a spare; the other five are connected to five system modules on overhead panel P5. The left master caution annunciator is also connected to fire protection panel P8-1. (See figure 2.) 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. (See figure 3.) Annunciation and dimming module M469 in the control stand P9 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. Pressing the system master caution annunciator recalls the previously illuminated system master caution annunciator. The FIRE WARN lights adjacent to the master caution lights are controlled by fire protection circuits and are not connected to the master caution lights. Refer to Chapter 26, Fire Protection.
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 load control center P6-3. (See figure 2.) Two MASTER CAUTION ANNUNCIATOR circuit breakers labeled No. 1 and BAT provide a 28-volt 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 load control center P6-3, provide power for the master caution logic circuits in the P5 modules.
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Master Caution and Dim/Test Components Location 543
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H23844
543 Master Caution and Dim/Test Components Location
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C. A master dim and test circuit is connected to all system indicator lights in the control cabin. A three position toggle switch labeled LIGHTS-DIM, BRT and TEST (on center instrument panel P2) 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. (See figure 4.) 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. (See figure 3.) 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 load control center P6. The annunciation and dimming module is in the control stand P9 panel.
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