R  Power Supply - Schematic 
R  Figure 005 
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 Power Supply - Schematic R Figure 005A
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 Power Supply - Schematic 
R  Figure 005B 
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 Power Supply - Schematic 
R  Figure 005C 
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R  **ON A/C 151-199, 
R  The busbar 210XP-C supplies 115VAC to the PES video through the circuit 
R  breaker 21MH and the relay 800MH. The busbar 210XP-B supplies 115VAC to the 
R  PES video through the circuit breaker 22MH and the relay 800MH. The busbar 
R  210XP-A supplies 115VAC to the PES video through the circuit breaker 24MH 
R  and the relay 800MH. 
R  The busbar 208PP supplies 28VDC through the circuit breaker 20MH to the PES 
R  video. This line operates the relay 800MH. 
R  The circuit breaker 21MH supplies the SCU 11MH and the VTR 12MH and 13MH. 
R  The circuit breaker 22MH supplies the HMDU on the LH passenger compartment 
R  side through the related tapping units . 
R  The circuit breaker 24MH supplies the HMDU on the RH passenger compartment 
R  side through the related tapping units . 
R  **ON A/C 201-210, 
R  (Ref. Fig. 005D) 
R  The busbar 210XP-C supplies 115VAC to the PES video through the circuit 
R  breaker 21MH. The busbar 210XP-B supplies 115VAC to the PES video through 
R  the circuit breaker 22MH and the relay 800MH. The busbar 210XP-A supplies 
R  115VAC to the PES video through the circuit breaker 24MH and the relay 
R  800MH. 
R  The SCU and the VTR(s) are supplied through the circuit breaker 21MH. This 
R  line also operates the relay 800MH. 
R  The HMDU installed on the LH passenger compartment side are supplied through 
R  the circuit breaker 22MH and the related tapping units. The HMDU installed 
R  on the RH passenger-compartment side are supplied through the circuit 
R  breaker 24MH and the related tapping units.
 **ON A/C 301-399, 
R  (Ref. Fig. 005E)
 The PES video is supplied with 28VDC through this circuit breaker:
 - 20MH - PES/VIDEO/CONTROL/MAIN
 The PES video is supplied with 115VAC through these circuit breakers:
 - 21MH - PES/VIDEO/CONTROL/VCC
 - 22MH - PES/VIDEO/CABIN/FWD/LH
 - 24MH - PES/VIDEO/CABIN/FWD/RH
 - 23MH - PES/VIDEO/CABIN/AFT/LH
 - 25MH - PES/VIDEO/CABIN/AFT/RH 

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 Power Supply - Schematic 
R  Figure 005D 
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 Power Supply - Schematic 
R  Figure 005E (SHEET 1) 
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 Power Supply - Schematic 
R  Figure 005E (SHEET 2) 
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R **ON A/C 051-099, 106-149, 151-199, 201-299, 301-399,

 5. Component Description
_____________________

R **ON A/C 051-099, 151-199, 201-210,
 A. System Control Unit (SCU)
 (Ref. Fig. 006)

 (1)
 General

 (a)
 The SCU is installed in the video control center in the passenger-compartment most forward LH lateral hatrack. It permits the control of the PES video through a special touch-screen and pushbutton switches found on the front of the unit.

 (b)
 Electrical connections are made through the prewired mounting plate 10MH to connectors on the back of the unit. Video and audio input data from the VTR are connected to connector J1B. CIDS related data such as ARINC 429 data, audio data and system power are connected to connector J1C. PES music related data are connected to connector J1C (audio data) and J1A (video keylines). The cabin decompression is connected to connector J1A.
　
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