A. Removal of the Audio Mixing Box
 (1)
 Disconnect the electrical connector (1) from the audio mixing box (2).

 (2)
 Put blanking caps on the disconnected electrical connectors.

 (3)
 Remove the four screws (3) and the the washers (4).

 (4)
 Remove the audio mixing box (2).

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 Audio Mixing Box (15WW)
 Figure 401/TASK 31-53-33-991-001
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1  1  Feb 01/98
 1  1
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 TASK 31-53-33-400-001
 Installation of the Audio Mixing Box (15WW)
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific access platform 1.6 m (5 ft. 3 in.)
 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
23-71-00-710-001 Operational Test of the CVR and the CVR Channel Recording 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 24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 34-41-00-740-002 BITE Test of the Weather Radar
R 52-41-00-410-002 Close the Avionics Compartment Doors after Access 31-53-33-991-001 Fig. 401
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 3. Job Set-up
__________
 Subtask 31-53-33-860-050

 A. Aircraft Maintenance Configuration
 (1)
 Make sure that the ground servise network is energized (Ref. TASK 24-42-00-861-001).

 (2)
 Make sure that the access platform is in position at the access door

 811. R (3) Make sure that the access door 811 is open (Ref. TASK 52-41-00-410-
R  002). Subtask 31-53-33-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU AUDIO MIXING  14WW K03
 4. Procedure
_________
 (Ref. Fig. 401/TASK 31-53-33-991-001)
 Subtask 31-53-33-420-050

 A. Installation of the Audio Mixing Box.
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Install the audio mixing box (2).

 (3)
 Install the four washers (4) and screws (3).

 (4)
 Tighten the four screws (3).

 (5)
 Remove the blanking caps from the electrical connectors.

 (6)
 Make sure that the electrical connectors are clean and in the correct condition.

 (7)
 Connect the electrical connector (1)

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 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 14WW
 Subtask 31-53-33-860-051
 C. Aircraft Maintenance Configuration
 (1)
 De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

 (2)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 Subtask 31-53-33-710-050
 D. Test
 (1)
 Do the operational test of the CVR and the CVR channel recording (Ref. TASK 23-71-00-710-001).

 (2)
 Do the BITE test of the weather radar (Ref. TASK 34-41-00-740-002).

 5. Close-up
________
 Subtask 31-53-33-410-050

 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
R (2) Close the access door 811 (Ref. TASK 52-41-00-410-002).
 (3)
 Remove the access platform(s).
 Subtask 31-53-33-862-050

 B.
 De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).
　
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