E. Put the Airplane Back to Its Usual Condition
 S 864-028
 (1)  
Set the two mode select switches on the IRS MSU to the OFF position.

 S 414-026

 (2)  
Close the 1201L electronic equipment access door if access is not necessary (AMM 12-31-11/201).

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737-300/400/500MAINTENANCE MANUAL
 S 864-022
 (3) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
 DIGITAL/ANALOG ADAPTER - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is for the removal of a digital/analog adapter (DAA). The second task is for the installation of a DAA.
 B.  Two DAAs are installed in the main equipment center. DAA-1 and DAA-2 are installed on shelf No. 2 in the electronic equipment rack E1.
 C.  See 20-40-12/201, Electrostatic Discharge Sensitive Devices for the correct procedure to remove/install the DAA.
 TASK 34-28-41-004-001
 2.  Digital/Analog Adapter Removal______________________________
 A.  References
 (1)  
AMM 12-31-11/201, Body Section 41 Access Doors and Panels

 (2)  
AMM 20-10-07/201, E/E Rack-Mounted Components

 B.  Access
 (1)  
Location Zones
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 C.  Procedure
 S 864-003
 (1)  AIRPLANES WITHOUT EFIS; Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6-1 Circuit Breaker Panel
 1) F/O ADI
 2) CAPT ADI (ALT)
 3) CAPT COMPASS XFMR (ALTN)
 4) DAA NO. 2 DC
 5) DAA/FMC NO. 2 AC
 6) DAA/FMC NO. 2 DC
 7) DAA/IRS NO. 2 AC
 8) F/O HSI
 9) F/O VSI

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 10) F/O RDDMI
 11) INSTR XFMR-2
 12) IRS NO. 2 AC
 13) IRS NO. 2 DC
 14) VHF NAV-2 VOR/LOC
 15) VHF NAV-2 G/S
 16) AUTO FLIGHT CONT SYS B ENGAGE INTLK A
 17) AUTO FLIGHT CONT SYS B MAC TRIM AC
 18) AUTO FLIGHT CONT SYS B MACH TRIM DC
 19) AUTO FLIGHT CONT SYS A SNSR EXC AC
 20) AUTO FLIGHT CONT SYS B WARN LIGHT (BAT)
 21) AUTO FLIGHT CONT SYS B FCC DC

 NOTE: Make sure that you close the AFCS B FCC DC circuit
____
 breaker last.

 (b)  
P6-3 Circuit Breaker Panel 1) DIM AND TEST 2) SECONDARY

 (c)  
P18-1 Circuit Breaker Panel 1) AFDS AIL FORCE LIM 2) AFDS MCP DC 3) AUTO FLIGHT CONT SYS A ENGAGE INTLK A 4) AUTO FLIGHT CONT SYS A MAC TRIM AC 5) AUTO FLIGHT CONT SYS A MACH TRIM DC 6) AUTO FLIGHT CONT SYS A SNSR EXC AC 7) AUTO FLIGHT CONT SYS A WARN LIGHT (BAT) 8) AUTO FLIGHT CONT SYS A FCC DC

 NOTE: Make sure that you close the AFCS A FCC DC circuit
____
 breaker last.

 9) AUTOTHROTTLE AC
 10) AUTOTHROTTLE DC
 11) DME-1
 12) VHF NAV-1 G/S
 13) VHF NAV-1 VOR/LOC

 (d)  P18-2 Circuit Breaker Panel 1) ADI 2) CAPT HSI 3) CAPT RDDMI 4) CAPT RDDMI ALT 5) CAPT VSI 6) FMCS CDU NO. 1 7) DAA 1 - DC 8) DAA/FMC 1 - AC 9) DAA/FMC 1 - DC 10) DAA/IRS 1 - AC 11) FMCS CDU NO. 2 (if installed)
　
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