(2)  
If the reading light has a rectangular lens, you open the passenger service unit (PSU) or attendant's service unit (ASU) to replace the lamp.

 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-23-61/201, Passenger Service Units (PSUs)

 (3)  
SSM 33-23-00 thru 33-23-99

 (4)  
WDM 33-23-11 thru 33-23-99

 C.  Access
 (1)  Location Zone
 100 Upper Half of Fuselage

 D.  Procedure
 S 962-000
 (1)  Replace the lamp.
 (a)  
Remove electrical power from the light:

 1)  Open each applicable circuit breaker for the reading light and attach the DO-NOT-CLOSE tag: a) On the load control center panel, P18.

 (b)  
READING LIGHT WITH A CIRCULAR LENS;
 Carefully replace the lamp.
 1) Remove the lens assembly.

 NOTE: With two fingers, push together the inner and outer
____ sides of the lens assembly. At the same time, quickly turn the lens assembly counterclockwise to disengage it.
 CAUTION: AIRPLANES WITH HALOGEN LAMPS;
_______ DO NOT TOUCH HALOGEN LAMPS WITH YOUR HANDS. WEAR GLOVES OR USE A CLEAN CLOTH WHEN YOU COME IN CONTACT WITH HALOGEN LAMPS. THE OIL/GREASE FROM YOUR HANDS CAN CAUSE HALOGEN LAMPS TO MALFUNCTION.
 2)  Replace the lamp.
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 33-23-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

CENTER OF THE SEAT
PASSENGER SERVICE UNIT (PSU)
SEE
B READING LIGHTS UNIT
PASSENGER COMPARTMENT
(EXAMPLE)

LIGHT BEAM OF
A READING LIGHT

Reading Lights - Lamp Replacement and Light Beam Adjustment

Figure 201 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
D11227
A 737-300/400/500MAINTENANCE MANUAL
READING LIGHT

Reading Lights - Lamp Replacement and Light Beam Adjustment
Figure 201 (Sheet 2)

D11228
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3) Install the lens assembly.
 NOTE: With two fingers, push together the inner and outer
____ sides of the lens assembly. At the same time, quickly turn the lens assembly clockwise to engage it.
 (c)  READING LIGHT WITH A RECTANGULAR LENS; Carefully replace the lamp. 1) Open the PSU or ASU to get access to the rear of the light
 (AMM 25-23-61/201). 2) Disconnect the electrical connector. 3) Push down and turn the reflector, then pull it out.
 CAUTION: AIRPLANES WITH HALOGEN LAMPS;
_______ DO NOT TOUCH HALOGEN LAMPS WITH YOUR HANDS. WEAR GLOVES OR USE A CLEAN CLOTH WHEN YOU COME IN CONTACT WITH HALOGEN LAMPS. THE OIL/GREASE FROM YOUR HANDS CAN CAUSE HALOGEN LAMPS TO MALFUNCTION.
 4) Replace the lamp in the reflector.
 5) Push and turn the reflector into its position.
 6) Connect the electrical connector.
 7) Close the PSU or ASU (AMM 25-23-61/201).

 S 712-003
 (2)  Do a test of the new lamp.
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Remove the each DO-NOT-CLOSE tag. 1) Close each circuit breaker that was opened.

 (c)  
At the PSU or ASU, set the switch for the reading light to the on position. 1) Make sure the new lamp comes on correctly.

 (d)  
Set the switch to the usual position.

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