(2)
 Press the locking catch (5) and carefully remove the Decoder/Encoder Unit (DEU) B (1) from the mounting tray (6).

 (3)
 Put blanking caps on the disconnected electrical connectors.

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 Decoder/Encoder Unit B.
 Figure 401/TASK 23-73-47-991-001

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 Decoder/Encoder Unit B
 Figure 401A/TASK 23-73-47-991-001-D 
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 Decoder/Encoder Unit B
 Figure 401B/TASK 23-73-47-991-001-A 
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 Decoder/Encoder Unit B
 Figure 401C/TASK 23-73-47-991-001-C 
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R  Decoder/Encoder Unit B 
R  Figure 401D/TASK 23-73-47-991-001-E 
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R **ON A/C 106-149, 301-399, 401-499,
 Subtask 23-73-47-020-051-A
 A. Removal of the Decoder/Encoder Unit (DEU) B
 (1)
 Do not disconnect the electrical connector (7) from the connection/termination box (4).

 (2)
 Release the spring latches (1) and disconnect the electrical connectors (2).

 (3)
 Release the nylatches (3) and remove the connection/termination box (4).

 (4)
 Make sure that you do not change the position of the coding switches and record them.

 (5)
 Put blanking caps on the disconnected electrical connectors.

 (6)
 Release the nylatches (5) and remove the DEU B (6).

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 TASK 23-73-47-400-001 Installation of the Decoder/Encoder Unit (DEU) B 300RH
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific stepladder 0.5 m (1 ft. 8 in.) No specific 1 STEPLADDER 0.5 M (1.6 FT)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
23-73-00-861-001 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
 **ON A/C 001-049, 051-099, 101-105, 201-299,
 23-73-47-991-001 Fig. 401 **ON A/C 106-149,
 23-73-47-991-001-D Fig. 401A
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 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
**ON A/C 151-199,
 23-73-47-991-001-A
**ON A/C 301-399,
 23-73-47-991-001-C

R  **ON A/C 401-499,
R  23-73-47-991-001-E FOR FIN 300RH1 25-23-42-000-001 25-23-42-400-001
FOR FIN 300RH4 25-23-41-000-001 25-23-41-400-001 25-23-43-000-001 25-23-43-400-001 FOR FIN 300RH5, 300RH6 25-23-42-000-002 25-23-42-400-002 FOR FIN 300RH6 25-23-41-000-001 25-23-41-400-001 25-23-48-000-001 25-23-48-400-001 FOR FIN 300RH7, 300RH8 25-23-42-000-002 25-23-42-400-002 Fig. 401B
Fig. 401C
Fig. 401D
Removal of the Ceiling Panels - Forward Utility Area
Installation of the Ceiling Panels - Forward Utility
 Area

Removal of the Ceiling Panels
Installation of the Ceiling Panels
Removal of the Upper Sidewall Panel(s)
Installation of the Upper Sidewall Panel(s)

Removal of the Ceiling Panels - Aft Utility Area
　
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