S 864-003

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Circuit Breaker Panel
 1) F/O EHSI
 2) EFIS SYM GEN R

 (b)  
P18 Circuit Breaker Panel
 1) CAPT EHSI
 2) EFIS SYM GEN L

 S 014-004
 CAUTION:_______DO NOT PULL THE CRT HANDLE. THE HANDLE TURNS OUT AUTOMATICALLY WHEN THE SPRING IS RELEASED. HOLD THE HANDLE UNTIL IT IS COMPLETELY RELEASED FROM THE SCREWS. YOU CAN CAUSE DAMAGE TO THE HANDLE IF YOU TURN IT OUT BEFORE IT IS RELEASED FROM THE SCREWS.
 (3)  Hold the CRT handle against the EHSI.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 034-005
 (4)  
Loosen the two screws at the top of the EHSI display.

 S 014-006

 (5)  
Pull the handle out and down.

 S 014-007

 (6)  
Pull the control column rearwards and hold it there.

 S 024-008
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ EHSI. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE EHSI.
 (7)  
Slowly pull the EHSI out from the instrument panel.

 S 034-009

 (8)
Install a dust cap on the electrical connector of the EHSI.

 TASK 34-22-31-404-010
 3. EHSI Installation (Fig. 401)
_________________
 A. References
 (1)  
AMM 21-58-02/501, Equipment Cooling System

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

 (3)  
AMM 29-15-00/201, Hydraulic Power

 B. Access
 (1)  Location Zones
 101/102 Flight Compartment

 C. Procedure
 S 864-011
 (1)  
Make sure hydraulic power is removed from the flight controls (AMM 29-15-00/201).

 S 864-012

 (2)  
Make sure these circuit breakers are open:

 (a)  
P6 Circuit Breaker Panel
 1) F/O EHSI
 2) EFIS SYM GEN R

 (b)  
P18 Circuit Breaker Panel
 1) CAPT EHSI
 2) EFIS SYM GEN L

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-22-31

 ú ú 01 Page 402 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 214-018
 (3)  Make sure the cooling air inlet and outlet screens on the rear of the EHSI are clean.
 S 434-013
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ EHSI. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE EHSI.
 (4)
Remove the dust cap from the electrical connector on the EHSI.

 S 424-014

 (5)  
Slowly push the EHSI into the instrument panel.

 NOTE: Make sure that the handle is fully extended out.
____
 S 414-015
 (6)  
Slowly release the control column.

 S 414-016

 (7)  
Put the handle in the up and locked position.

 S 434-017

 (8)  
While the handle is held, tighten the mounting screws.

 D. Prepare for the EHSI Test
 S 864-019
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-020

 (2)  
Make sure the BAT switch on the pilots' forward overhead panel is in the ON position.

 S 864-021

 (3)  
Make sure that the STANDBY POWER switch on the pilots' forward overhead panel is in the AUTO position.

 S 914-022
 CAUTION: MAKE SURE THAT YOU OPERATE THE EQUIPMENT COOLING SYSTEM BEFORE
_______ YOU ENERGIZE AN ELECTRONIC SYSTEM. TOO MUCH HEAT CAN CAUSE DAMAGE TO ELECTRONIC EQUIPMENT.
　
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