(2)  
SSM 24-32-11

 B.  
Access

 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 C.  
Prepare For Removal

 S 864-014
 (1)  Before you remove TRU 1, T11, open this circuit breaker and install DO-NOT-CLOSE tag:
 (a)  C806, TR UNIT NO 1, P6 PNL
 S 864-015
 (2)  Before you remove TRU 2, T12, open this circuit breaker and install DO-NOT-CLOSE tag:
 (a)  C807, TR UNIT NO 2, P6 PNL
 S 864-016
 (3)  
Before you remove TRU 3, T13, open this circuit breaker and install DO-NOT-CLOSE tag:

 (a)  C808, TR UNIT NO 3, P6 PNL

 D.  
Procedure

 (1)  
Get access to the E3 rack in the electronic compartment.

 (2)  
Remove the transformer rectifier (Ref 20-10-07/201).

 S 014-001
 S 024-002
 TASK 24-21-31-404-010
 3.  Transformer Rectifier Installation (Fig. 401)__________________________________
 A.  References
 (1)  20-10-07/201, E/E Rack-Mounted Components
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Transformer Rectifier Installation
Figure 401

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 ALL  ú ú 01 Page 402 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  
SSM 24-32-11

 B.  
Access

 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 C.  
Procedure

 S 014-005
 (1)  
Get access to the E3 rack in the electronic compartment.

 S 424-006

 (2)  
Install the transformer rectifier (Ref 20-10-07/201).

 S 864-017

 (3)  
If you installed TRU 1, T11, close this circuit breaker and remove DO-NOT-CLOSE tag:

 (a)  C806, TR UNIT NO. 1, P6 PNL
 S 864-018
 (4)  If you installed TRU 2, T12, close this circuit breaker and remove DO-NOT-CLOSE tag:
 (a)  C807, TR UNIT NO. 2, P6 PNL
 S 864-019
 (5)  If you installed TRU 3, T13, close this circuit breaker and remove DO-NOT-CLOSE tag:
 (a)  C808, TR UNIT NO. 3, P6 PNL
 S 714-007
 (6)  Do these steps for the test of the No. 1 and No. 2 transformer rectifier:
 (a)  
Make sure that the BUS TRANS switch is in the AUTO position.

 (b)  
Open these circuit breakers and attach the DO-NOT-CLOSE tags:

 1)  P6-4 AIR CONDITIONING AND AIRSTAIR CONTROL AC POWER INDICATION Panel a) C807, TR UNITS NO. 2 b) C808, TR UNITS NO. 3 c) C1065, DC BUS 1 d) C1066, DC BUS 2

 (c)
Make sure that these circuit breakers are closed:

 1)  P6-4 AIR CONDITIONING AND AIRSTAIR CONTROL AC POWER INDICATION Panel a) C4, CONTROL GENERATOR NO. 1 b) C5, CONTROL GENERATOR NO. 2 c) C6, CONTROL GENERATOR APU d) C806, TR UNITS NO. 1
 2)  P6-5 DC POWER INDICATION Panel a) C31, DC BUS POWER NO. 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 b) C23, DC BUS INDICATION BUS NO. 1
 3) P18-5 Panel
　
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