B. Using appropriate VHF NAV control panel, tune the system as follows:
 (1)  
Select manual. Check MANUAL switch
 indicator comes on and
 AUTO frequency display
 is blank.

 (2)  
Rotate tuning controls to select appropriate VOR/ILS frequency.

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 1.

2.

3.

A
737-300/400/500MAINTENANCE MANUAL
 DME SYSTEM - TROUBLE SHOOTING
_____________________________
General
_______
 A.  The tree-type format makes the use of the self-test features of the interrogator unit. It gives a quick procedure to isolate the faults without the use of additional test equipment.
 B.  The procedure is written for one DME system. When two systems are installed, interchange the components to do the trouble shooting.
 C.  If the problem continues, use the wiring diagram as a reference to
 examine the airplane wiring.References
__________
 A.  AMM 21-58-00/501, Equipment Cooling System
 B.  AMM 24-22-00/201, Manual Control (Apply Power)
 C.  AMM 34-22-00/501, Electronic Flight Instrument System (EFIS)
 D.  AMM 34-28-01/401, Inertial Reference System (IRS)
 E.  AMM 34-28-81/401, RDDMI - Removal/Installation
 F.  AMM 34-31-51/401, VHF NAV Control Panel - Removal/Installation
 G.  AMM 34-55-11/401, DME Antenna - Removal/Installation
 H. AMM 34-55-21/401, DME Interrogator - Removal/InstallationTrouble Shooting - DME SYSTEM
_____________________________
 A.  Prepare for Trouble Shooting DME Systems No. 1 and 2
 (1) Supply electrical power (AMM 24-22-00/201).
 CAUTION: MAKE SURE THE EQUIPMENT COOLING IS OPERATIONAL BEFORE YOU TURN
_______ ON THE ELECTRONIC SYSTEM OR DAMAGE TO THE EQUIPMENT MAY RESULT. EQUIPMENT COOLING SYSTEM MUST BE SET FOR NORMAL COOLING AS DESCRIBED IN AMM 21-58-00/501.
 (2)
Supply equipment cooling (AMM 21-58-00/501).

 (3)
Make sure these circuit breakers on the P6 and P18 panel are closed:

 (a) Make sure these circuit breakers on the P6-1 Panel are closed:
 DME-2 DAA NO. 2 FMC AC F/O RDDMI DAA NO. 2 IRS AC INST FMR-2 DAA NO. 2 DC VHF NAV-2 VOR/ILS IRS NO. 2 AC EFIS SYM GEN R IRS NO. 2 DC EFIS CONT PANEL R DAA FMC NO. 2 EHSI
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A 737-300/400/500MAINTENANCE MANUAL
 (b)  Make sure these circuit breakers on the P6-2 Panel are closed:
 INTERPHONE__________  AUTO FLT CONT SYS B___________________
 CAPT BAT CAPT NO. 2 BUS CAPT AUDIO OBS' AUDIO F/O's AUDIO F/O's BAT F/O NO. 2 BUS FCC DC
 (c)  Make sure these circuit breakers on the P18-1 panel are closed:
 AUTO FLT CONT SYS A___________________
 VHF NAV-1 VOR/ILS DME-1 FCC DC
 (d)  Make sure these circuit breakers on the P18-2 Panel are closed:
 INSTR XFMR-1 INSTR XFR CAPT RDDMI  DAA FMC NO. 1DAA NO. 1 FMC ACDAA NO. 1 IRS AC DAA NO. 1 DC IRS' NO. 1 AC IRS' NO. 1 DC EFIS SYM GEN L EFIS CONT PANEL L EHSI
 (4) (5) (6) (7)  Set the EFI, VHF NAV and the IRS switches to the NORMAL position.On the EFIS control panel, set the EHSI mode selector switch to the FULL VOR/ILS position.Turn on the electronic flight instrument system (Ref 34-22-00) and inertial reference systems (Ref 34-28-01).Make sure each IRS is aligned and in the NAV mode of operation (Ref 34-28-01).

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