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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
3026R1-M564 MARKERHIGH 28V DCD55
A
RI  I
ELEX 6
D55  BGHTWRLOW
BUS 1C63
MODULATED AIRWAYS
24-00-01 MARKER BEACON
19 NC A75 MHZ400 HZ 1.3 KHZY
75 MHZ
S
GHT
I
OSCILLATOR 3 KHZ MODULATOR TEST CKT
R
TEST
B M
P18-1 CIRCUIT BREAKER PANEL
IMIDDLE D
SIGNAL
DL
AF,IF AMP
DC
E
CONVERTER
POWER
GHTBOI
R
U
T
E
OUTER
LAMP DRIVER
R HIGHD423 PRESS TO TEST
TIMER 17
7 11 6
LOW 1 D57
S210 MARKERA1
SENSE SW
9
M27  MARKER BEACON
W ANTENNA (75 MHZ)75 MHZ
 MHZ4.6AUDIO
IF
STA 620

CONVERTER
SELECTIVE
IF FILTER DETECTORINPUT
AIRWAY FILTER
AGC
3
GATE
A
AGC
MIDDLE
20 NC 1ST AUDIOAMPL 10

B22
4 OUTER
2 5
1 23-51-00
L335 CAPTAINSMKR BEACON21 NC D125B 2 LIGHTS
7
57 MARKER BEACONAUDIO GAIN
P1-1 CAPT INST PNLADJUST AUDIO INPUTS
D427 AMPL AMPL2ND AUDIOAUDIO POWER
8
M69  AUDIO ACCESSORY5 UNIT (E2-1)
D2501A
15 MARKER BEACON

3
3 KHZ
AUDIO INPUTS

LAMP SWITCH 5
9 W
3000,
M1353 REMOTE ELECTRONIC
4
UNIT (E2-1)AUDIO LAMPAND

1300
 KHZ1.3
AIRWAY
DRIVER 400 HZ
LAMP SWITCH
FILTERS
4 3 A
400 HZ
MIDDLELAMP SWITCH
1 PRESS AND TEST FOR 5 SECONDS. 3
NOTES:
10 B
LIGHTS AND AUDIO WILL CYCLEBRIGHT AI
FOR 1 TO 1.5 SECONDS INR
SEQUENCE (400, 1300 AND

AIRWAYS W
M26 MARKER BEACON RECEIVER (E2-4) A 3000 HZ) SY OUTER
IGHT
RMBIL336 F/O MKR
2AIRPLANES WITH AUDIO ACCESSORY UNIT MIDDLE D
DBEACON LT
LE
IGHT
P3-3 F/O INST
3  R
AIRPLANES WITH REMOTE ELECTRONIC UNIT  B O
UPANEL
OUTER TER
Marker Beacon System Schematic
Figure 4

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 MARKER BEACON SYSTEM - TROUBLE SHOOTING
_______________________________________
 1.  General_______
 A.  This subject has one task. The task is to troubleshoot the marker beacon system.
 B.  When a test step does not operate correctly, find the box that has the trouble symptom and do the corrective action. Continue to follow a single line until you find the necessary corrective action. Do the specified corrective action, then do the step at which you found the failure and complete the test to do a check of the system.
 C.  If the corrective action does not correct the problem, do a check of the wiring by use of the wiring diagrams.
 2.  Prepare for the Trouble Shooting________________________________
 A.  References
 (1)  
23-51-00/501, Flight Interphone System

 (2)  
24-22-00/201, Manual Control

 B.  Access
 (1)  Location Zone
 101,102 Control Cabin

 C.  Procedure
 (1)  
Make sure these circuit breakers are closed:

 (a)  P18 Load Control Center - Left
 1) MARKER BEACON
 2) FLT INTPH

 (2)  
Set the sensitivity control to the HIGH (or HI) position.

 (3)  
Operate the marker beacon control on the audio selector panel.

 (4)  
Do this task to supply electrical power: "Manual Control" (Ref 24-22-00/201).

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