**ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,

 (Ref. Fig. 002)
 A. Component Description
 (1)
 When the POWER READ membrane switch on the FAP 120RH is pushed, the power units 511RH thru 514RH are activated. The coils of the relays 7LW and 8LW in the panel 2000VU are energized. This closes the contacts of the relays and 115VAC is supplied to the power units.

 (2)
 When the reading-light membrane switches 501RH thru 503RH are pushed, a ground pulse is supplied to the voltage control circuit. This completes the primary circuit of the step-down transformer. The transformer changes the 115VAC down to 6VAC which causes the lights to come on.

 (3)
 A test of the reading lights, the work lights and the PCB circuits is made by the related BITE test on the Programming and Test Panel (PTP) 110RH. In this test all reading lights and work lights come on for approximately 3 s and then go off. After the test the PTP 110RH shows the status of the reading lights, the work lights and the PCBs.

 **ON A/C 301-399,
 (Ref. Fig. 002A)
 A. Component Description
 (1)
 The Cabin Reading Light System provides each passenger seat with individual illumination. The passenger reading light can be controlled with a seperat pushbutton switch on the Passenger Service Unit (PSU) or via the Passenger Service System (PSS)/Cabin Intercommunication Data System (CIDS) from the Power Control Unit (PCU). The passenger reading lights are supplied by Passenger Interface Supply Adapters (PISA). These units transform the voltage from 115VAC to the required reading light supply voltage of 6VAC. The PISA provides the interface to CIDS for test, control functions and internal tests to detect reading light malfunctions. (To be issued later|)

 (2)
 Not Applicable

 (3)
 Not Applicable

R  **ON A/C 401-499, 
R  (Ref. Fig. 002B) 
R 
R  A. Component Description 
R 
R  (1) When the POWER READ membrane switch on the FAP 120RH is pushed, the 
R  power units 511RH and 512RH are activated. The coils of the relays 
R  7LW and 8LW in the panel 2000VU are energized. This closes the 
R  contacts of the relays and 115VAC is supplied to the power units. 
R 
R  (2) When the reading-light membrane switches 501RH thru 503RH are pushed, 
R  a ground pulse is supplied to the voltage control circuit. This 
R  completes the primary circuit of the step-down transformer. The 
R  transformer changes the 115VAC down to 6VAC which causes the lights 
R  to come on. 
R 
R  (3) A test of the reading lights, the work lights and the PCB circuits is 
R  made by the related BITE test on the Programming and Test Panel (PTP) 
R  110RH. In this test all reading lights and work lights come on for 
R  approximately 3 s and then go off. After the test the PTP 110RH shows 
R  the status of the reading lights, the work lights and the PCBs.

 PASSENGER READING LIGHTS - ADJUSTMENT/TEST
__________________________________________
 TASK 33-25-00-710-001
 Operational Test of the Passenger Reading Light-System
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
23-73-00-861-001 Energize the Cabin Intercommunication Data System (CIDS) 23-73-00-862-001 De-energize the Cabin Intercommunication Data System (CIDS) 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power
 33-27-00-710-001 Operational Test of the Cabin Attendant Work-Light
R 33-27-00-740-001 Bite Test of the Cabin Attendant Work-Light through

R MCDU
 3. Job Set-up
__________
 Subtask 33-25-00-860-050
 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).

 (2)
 Energize the Cabin Intercommunication Data System (CIDS) (Ref. TASK 23-73-00-861-001).

 Subtask 33-25-00-865-050
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
　
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