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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Left (or right) system master caution annunci-ator section is not recalled when annunciator is momentarily pressed Recall and master test functions for both master caution annunci-ators inoperative System module logic or system master caution annunciator inoperative Short to ground in a master caution annunci-ator recall switch, or master test relay (R33), or system wiring Observe which system indi-cator lights are illumi-nated on P5 modules. Momentarily press left (or right) system master Using system wiring dia-grams, isolate short to component or wiring caution annunciator. Ob-serve corresponding system master caution annunciator sections illuminate. If none illuminate, annunci-ator is faulty. If only one anunciator section does not illuminate, relamp section and retest. If section still does not il-system module is faulty luminate, corresponding Replace system master caution annunciator. Relamp annunci-ator. Replace system module Replace compo-nent (master caution annunci-ator module or master test relay) or repair wiring as appli-cable
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ALL ú ú 01 Page 103 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
3. Master Dim and Test Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
System indicator Burned out bulb Hold LIGHTS switch to TEST. Relamp system
light does not Observe system indicator indicator light
illuminate or is light illuminates. If not,
dim when LIGHTS bulb is faulty
switch held to
TEST
Group of lights Master test relay Hold LIGHTS switch to TEST. Replace master
do not illuminate contact open or Observe group of lights do test rely R33.
when LIGHTS one dim relay has not illuminate Replace master
switch held to TEST contacts open Master test relay R33 or a dim relay is probably faulty dim module M564. Replace master dim relay R34. Replace auxiliary
through each relay to isolate faulty relay (Refer to Wiring Diagram Manual for specific circuits) Conduct continuity check master dim relay R87
All lights do not LIGHTS switch Hold LIGHTS switch to TEST. Replace LIGHTS
illuminate when S270 inoperative If lights do not illumi- switch S270
LIGHTS switch nate, switch is faulty
held to TEST
Group of lights Open zener diode Position LIGHTS switch to Replace either
go off when DIM. Observe which lights M207,M208,M209,
LIGHTS switch go off. Check continuity M210 or M394
positioned to DIM of zener diodes M207,M208, M209,M210 and M394 in load control center P6 to iso-late faulty zener diode. (Refer to Wiring Diagram Manual to check lights on specific zener diode circuit)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
33-15-00
ALL ú ú 01 Page 104 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
(1) Pilot's Autopilot Disengage Light Copilot's Autopilot Disengage Light Master Caution Lights and Annunciators Antiskid Light (2) (3) (4) When LIGHTS switch is held to TEST position, if one of following sys-tem indicator lights does not illuminate: Open transistor-diode dimming circuit in M469 annunciator and dimming Relamp system indicator light. Hold LIGHTS switch to TEST. If light is still inoperative, annunciation and dimming module is faulty Replace M469 annunciation and dimming module
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 灯 LIGHTS(20)
