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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1090 MHz
1090 MHz
TRANSMITTER MODULATOR
ALT TRIGGER CONTROL
ENABLE
D149B D309B
60 MHz
OUTPUT RLY CODE
970 MHz
A1 31 5A1
LOCAL OSCILLATOR MIXER AUTOMATIC OVERLOAD CONTROL CODE
IDENT
A2 32
6 A2
PROCESSING
D97 D149A
A4 33
7 A4
ENABLE
BOP OUT
CIRCUITS
1030
VIDEO
2
IF
DIPLEXER PRESELECTOR
ALTITUDE
VIDEO
VIDEO
B1 34
8 B1
DRIVERS
LATCH

BUS 5-14
DETECTOR SUPPR
MHz B2 35
1 B2
REPLY
PROCESSORMONITOR
CODE
FAULT
MODE TRIGGER CODE
B4 36
2 B4
M44 ATC ANT 1
ANTENNA SELF-TEST
C1 37
3 C1
FROM A3
MATRIX
11V AC
PROCESSING
CONTROL
(STA 305 BOTTOM)
C2 38
4 C2
(34-11-0)
MONITOR OSCILLATOR
33-11-41
C4 39 9 C4
VALID
MODE DECODER
11V D2 40 11 D2
REPLY
AND TRIGGER
S1 S2D4 41 12 D4
AC
CONTROL
R/T
MODE A/B REPLY CODE
POWER TEST Y B

SELF ANT
BY
A1 A2 A4 B1 B2 B4 C1 C2 C4 D1 D2 D413
REPLY
DECODER
FAULT
SUPPLY COMMON
RESET
M163 ATC ENCODER
MODE B
G
TRANSPONDER 1 M196 DIGITAL AIR DATA
(E2-2) 12 13 5 11 42 14 66 1 9 10 76 1819202122232425262728 29 COMPUTER 1 (E1-1)
D149B
D149B
AC DC 115V ACELEX
1
SUPPRESSIONPWR 1
3
C186
ATC 1

M164 DME (P18-1)
INTERROGATOR 1
(E2-2)
X = GND
0 1234567D211
D211REPLY

D1 G_ D2 H_ D4 I_
_G
K
T211-1FAULT 1SUPPRESSION
(E2-2
A
M_A
OCTAL TO BINARY
STBY
BFAULT REPLY
MODE B SHELF)
Q_
C1 D_
SELECT OCTAL TOM165 DME
1200
C2 E_
TEST
ATC ON 1 BINARY INTERROGATOR 2
_T
C4 F_ (E2-2)
ATC ON 2
IDENT
ALT RPTG
T
5V
12
B
ATC
B1 A_
OFF
OCTAL TO
PANEL AND
W
B2 B_
DIAL LIGHTS BINARY
B4 C_
GND
C
IDENT
A1 X
OCTAL TO
J_
A2 Y
BINARY
A4 Z
TEST
ALT RPTG 1
S_
115V AC
L ELEX
R
ALT RPTG 2PWR 2
N
3
1
C188
R_
OFF
ATC 2
(P6-1)

2
ALT RPTG
DC AC

N_
P8-29 ATC CONTROL PANEL D311B D155B
D155A D155B 13 12 5 131142 661410 7 6181920212223242526272829
12 40
1 41
11 39
9
D99 D155A
4 2
38 INTERNALS
3
37 SAME
INTERNALS
2
36 AS M196
SAME AS M163
1
35 M45 ATC ANT 2
8
34 (STA 355 BOTTOM)
7 32
33
6 31
5
B381 ATC TRANSPONDER NO. 2 (E2-2) M368 DIGITAL AIR
ATC System Schematic
DATA CMPTR 2 (E1-1)
Figure 3

A 737-300/400/500MAINTENANCE MANUAL
 (b) (c)  On all transponders when eight consecutive replies are completed, the reply indicator (transponder and control panel) are energized.The automatic self test cycle is initiated when a valid interrogation is not received within 15 seconds after the last interrogation.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ATC SYSTEM - TROUBLE SHOOTING
_____________________________
 1.  General_______
 A.  The trouble shooting procedures make use of the self-test features of the ATC transponder and ATC system test to isolate problems. These procedures is in a tree-type format.
　
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