33-15-00
ALL ú ú 01 Page 1 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
MASTER DIM MODULE MASTER DIM RELAY AUX MASTER DIM RELAY MASTER TEST RELAY DIODE & HEAT SINK ASSY
Master Caution and Dim/Test Components Location
Figure 1 (Sheet 1)
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33-15-00
ALL ú ú 01 Page 2 ú Nov 15/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
MASTER CAUTION
LIGHT
MASTER
CAUTION
PUSH TO RESET
SYSTEM MASTER CAUTION ANNUNCIATORS
LEFT SIDE OF THE LIGHTSHIELD
MASTER CAUTION
LIGHT (RIGHT)
FIRE
WARN
BELL CUTOUT
SYSTEM MASTER CAUTION ANNUNCIATORS
RIGHT SIDE OF THE LIGHTSHIELD
MASTER DIM AND TEST SWITCH
Master Caution lights - Component Location
Figure 1 (Sheet 2)
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ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
D. Power for the lights in the master dim and test circuits is from three 28v dc circuit breakers labeled INDICATOR MASTER DIM BUS - NO. 1 DC, NO. 2 DC and BAT. The power sources are cross-fed to the lights (through diodes) to ensure power is still available in case one of the buses is de-energized. The three power lines are then connected through the master dim relay to six section circuit breakers where power is distributed to the various system indicator lights within the control cabin. A DIM & TEST circuit breaker provides 28v dc to the dim and test relays and to certain system indicator lights as well as the master caution circuits. All circuit breakers are on P6-3 load control center.
E. For more data about this lighting system, refer to these sources:
(1)
SSM 33-18-20 thru 33-18-99
(2)
WDM 33-18-01 thru 33-18-99
2. Master Caution Lights and Annunciator_____________________________________
A. The master caution light consists of an amber light cap labeled MASTER CAUTION - PUSH TO RESET, a bulb and a base with an internal switch. Pressing the light cap operates the momentary switch and interrupts power to the master caution circuits causing the lights to go off. The light is easily relamped after pulling off the light cap.
B. The system master caution annunciator is composed of six sections with two bulbs in each section, a base with an internal switch and a light cap divided into six sections. The light cap sections on the pilot's side are labeled FLT CONT, ELEC, IRS, APU, FUEL and OVHT/DET. The light cap sections on the copilot's side are labeled ANTI-ICE, ENG, HYD, OVERHEAD, DOORS, and AIR COND. Pressing the light cap operates the momentary switch which applies a ground to master caution circuits causing all lights to illuminate. When released, only those systems with detected faults will have indicator lights on and the corresponding system master caution annunciator on. The annunciator is easily relamped after pulling off the light cap.
3. System Indicator Lights_______________________
A. The majority of the system indicator lights on the various modules throughout the control cabin are composed of a light cap, two bulbs and a base with two diodes, a fuse and a momentary switch. Pressing the light cap operates the momentary switch which causes the light to illuminate (push-to-test). The annunciator is easily relamped after pulling the light cap assembly from the base.
B. Two types of lights are used, one is a ground seeking type which requires a ground controlled circuit to turn it on; the other is a power seeking type which requires a power controlled circuit to turn it on . The majority of the lights are of the ground seeking type. A few lights contain only one bulb and no diodes, and are not connected to the master caution circuits; however, they are operated by the master dim and test circuits. Diodes for these lights are usually in M469 annunciation and dimming module.
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