(3)  
Remove the relay from the rack.

 S 034-003
 S 024-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Compass Transfer Relay Installation
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A05812
A 737-300/400/500MAINTENANCE MANUAL
 TASK 34-28-94-404-005
 3. Compass Transfer Relay Installation
___________________________________
 A. References
 (1)  
AMM 21-58-00/501, Equipment Cooling System

 (2)  
AMM 24-22-00/201, Manual Control

 B. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 C. Procedure
 S 864-006
 (1)  Make sure that these circuit breakers are open:
 (a)  
P6 Circuit Breaker Panel
 1) INSTR XFMR 2
 2) CAPT CMPS XFMR (ALT)
 3) DAA NO. 2 FMC
 4) DAA NO. 2 FMC AC
 5) DAA NO. 2 IRS AC
 6) DAA NO. 2 IRS DC

 (b)  
P18 Circuit Breaker Panel
 1) INSTR XFER
 2) INSTR XFMR 1
 3) F/O CMPS XFMR (ALT)
 4) DAA NO. 1 FMC
 5) DAA NO. 1 FMC AC
 6) DAA NO. 1 IRS AC
 7) DAA NO. 1 IRS DC

 S 424-007
 (2)  
Connect the relay to the rack.

 (3)  
Install the screws into the face of the relay.

 S 864-009

 (4)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 S 434-008
 (a)  P6 Circuit Breaker Panel
 1) INSTR XFMR 2
 2) CAPT CMPS XFMR (ALT)
 3) DAA NO. 2 FMC
 4) DAA NO. 2 FMC AC

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A
737-300/400/500MAINTENANCE MANUAL
 5) DAA NO. 2 IRS AC 6) DAA NO. 2 IRS DC

 (b)  P18 Circuit Breaker Panel
 1) INSTR XFER
 2) INSTR XFMR 1
 3) CAPT CMPS XFMR (ALT)
 4) DAA NO. 1 FMC
 5) DAA NO. 1 FMC AC
 6) DAA NO. 1 IRS AC
 7) DAA NO. 1 IRS DC

 D. Compass Transfer Relay Test
 S 864-010
 (1)  
Make sure that these circuit breakers are closed:

 (a)  
P6 Circuit Breaker Panel 1) INSTR XFMR 2 2) CAPT COMPASS XFMR (ALTN) AC 3) DAA NO. 2 FMC 4) DAA NO. 2 FMC AC 5) DAA NO. 2 IRS AC 6) DAA NO. 2 IRS DC 7) DIM AND TEST 8) INSTR XFMR-2 9) IRS NO. 1 AC 10) IRS NO. 1 DC 11) MASTER DIM BUS BAT 12) MASTER DIM BUS NO. 1 DC 13) MASTER DIM BUS NO. 2 DC 14) MASTER DIM BUS SECT 2

 (b)  
P18 Circuit Breaker Panel 1) INSTR XFMR 1 2) CAPT CMPS XFMR (ALT) 3) DAA NO. 1 FMC 4) DAA NO. 1 FMC AC 5) DAA NO. 1 IRS AC 6) DAA NO. 1 IRS DC 7) EQUIPMENT COOLING BLOWER ALTN AC 8) EQUIPMENT COOLING BLOWER NORMAL AC 9) EQUIPMENT COOLING CONTROL 10) F/O COMPASS XFMR (ALTN) AC 11) INSTR XFMR-1 12) IRS NO. 2 AC

 (2)
Supply the electrical power (AMM 24-22-00/201).

 S 864-011
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