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A
737-300/400/500MAINTENANCE MANUAL
 c)  All the segment and punctuation indicators on the ISDU go off.
 E.  Put the Airplane Back to Its Usual Condition
 S 865-078
 CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THE SWITCH.
 YOU MUST MOVE THE MSU SWITCH TO THE OFF POSITION BEFORE POWER IS REMOVED FROM THE AIRPLANE. IF THE POWER IS REMOVED WITH THE IRU's ON, THE IRS WILL SWITCH TO BATTERY POWER AUTOMATICALLY AND A WARNING HORN WILL SOUND.
 (1)
Turn the mode switches on the MSU to the OFF position.

 S 865-093

 (2)
Turn off the EFIS cooling if it is not necessary (AMM 21-58-02/501).

 S 865-079

 (3)
Turn off the IRU cooling if it is not necessary (AMM 21-58-03/501).

 (4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 865-080
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737-300/400/500MAINTENANCE MANUAL
 INERTIAL SYSTEM DISPLAY UNIT - SERVICING
________________________________________
 1.  General (Fig. 301)_______
 A.  This procedure contains two tasks. The first task is the replacement of an alphanumeric readout or a decimal/minute/degree lamp in the inertial system display unit (ISDU). The second task is to test the display readouts and lamps from the ISDU control panel.
 B.  You can find the ISDU in the flight compartment on the pilot's overhead panel, P5. The ISDU has eleven seven-segment numerical readout lamps, one seven-segment alphanumeric N-S readout lamp, and one seven-segment alphanumeric E-W readout lamp. These lamps are used to display navigational information and malfunction codes. There are also six bi-pin lamps used for decimal/minute/degree indication.
 TASK 34-28-11-963-031
 2.  Replacement of a Numeric/Alphanumeric Readout or Decimal/Degree/Minute Lamp___________________________________________________________________________ (Fig. 301)
 A.  Special Tools and Equipment
 (1)  
Display Removal Tool, P/N 26000507-101 (or equivalent)

 (2)  
Bi-pin Lamp Removal Tool, P/N 26000506-101 (or equivalent)

 B.  Access
 (1)  Location Zones
 101 Control Cabin, Left

 C.  Replacement of a Numeric/Alphanumeric Readout Lamp or a
 Decimal/Degree/Minute Lamp

 S 863-032
 (1)  
Set the two mode select switches on the inertial reference system (IRS) mode select unit (MSU) to the OFF position.

 S 863-033

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

 (a)  
P6-3 Circuit Breaker Panel
 1) SECONDARY
 2) IRS NO. 2 AC
 3) IRS NO. 2 DC

 (b)  
P18-2 Circuit Breaker Panel
 1) IRS NO. 1 AC
 2) IRS NO. 1 DC

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
NUMERIC READOUT
(11 LOCATIONS)

EAST/WEST READOUT
NORTH/SOUTH READOUT

ISDU Controls and Displays
Figure 301

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A 737-300/400/500MAINTENANCE MANUAL
 S 023-034
 (3)  Remove the transparent window filter assembly: (a) Loosen the two captive screws that hold the window assembly to the ISDU.
　
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