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 B.  Ensure the variable transformer control is positioned to provide maximum brightness before assuming an entire circuit is inoperative. Turning the variable transformer control to the dim or off position reduces the circuit voltage sufficiently for relamping, replacing lightplates or instruments. When replacing instruments, ensure associated circuit breakers are opened or system is inoperative before removing electrical connectors. Spare bulbs are located in a box mounted on the right sidewall adjacent to the copilot's seat. The following trouble shooting chart lists the more common type of lighting problems which may occur and the procedures for isolating the faulty component.
 2.  Ballast Trouble Shooting Procedure__________________________________
 A.  General
 (1)  The background lighting in the 737-300/-400/-500 aircraft has a lightshield ballast (P/N 1646-1-7). If this ballast is replaced more than once in approximately one week, then it is recommended that you do this procedure before you replace the ballast again.
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
WDM 33-14-01

 C.  Procedure
 (1)  
Disconnect the lightshield ballast.

 (2)  
Renove all four fluorescent lamps.

 (3)  
Make sure that the circuit matches wiring diagram (WDM 33-14-01).

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A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Panel light  Burned out bulb  Observe other panel lights  Replace light 
inoperative  or transformer  probably bad. If OK, bulb is bad. If off, transformer is on circuit are operative. other lights on circuit  transformer. Replace plate. 
Instrument light  Burned out bulb  Observe other panel lights  Replace 
inoperative  or transformer  probably bad. If OK, bulb is bad. If off, transformer is on circuit are operative. other lights on circuit  transformer. Replace instrument. 
Standby Instrument  Burned out bulb  Observe other panel lights  Replace instrument 
light inoperative  or transformer or faulty relay  R237 is bad. T162 bad. If lights still inoperative, relay, If OK, bulb is bad. If on circuit are operative. other lights on circuit off, open CAPT 28V Primary Circuit Breaker. If lights OK, transformer  Replace relay. transformer. Replace instrument. 
Floodlight  Burned out bulb  Observe other lights on  Relamp floodlight. 
inoperative  or transformer  off, transformer is probably bad. OK, floodlight is bad. circuit are operative. If other lights on circuit  transformer. Replace 
Background  Burned out bulb,  Rotate BACKGROUND control  Relamp fluorescent 
fluorescent light  ballast or switch  to maximum bright position.  light. 
inoperative  If all lights inoperative, operative. If OK, relamp light on circuit are Observe other fluorescent fluorescent light, if still not OK, replace ballast.  Procedure). Shooting Ballast Trouble (Refer to the Replace ballast 
not OK, replace control. replace ballast. If still  Replace control. 

Control Cabin Lighting Troubleshooting Chart
Figure 101

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
737-300/400/500MAINTENANCE MANUAL
 (4)  Measure the circuit for shorts to ground and for phase to phase
 shorts.
 NOTE: With all of the components removed, phase to phase and____
 phase to ground should be greater than one megohm.
 (5)  Install all four lamps.
 (6)  Install the new lightshield ballast.
 (7)  Do a test of the new lightshield ballast:
 (a) Supply electrical power (AMM 24-22-00/201).
 (b) Make sure that these circuit breakers are closed:
　
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