M/S
SCAN

LINE COLORLEGEND VIDEO
FROM R/T
E LEGEND VIDEO INTDRIVERS
NO. 1
F GEN GEN
(SHT 3)
LFTH MONITOR

20 (SHT 3)
A
_
DC
INPUT INTENSITYP MEMORY_ LINE WEATHER VIDEOINTER-DATA22ELEV

PNL LTS
INPUT
_Q REVRS FWD FACE WORDDRIVE

5V AC
V/H RETRACE RGBBB BUFFER
(33-11-00)
27 DRIVER CRTA V/HINPUT WEATHERRGTLINEELEV B DELFECTIONAZIMUTH X/Y MEMORYDRIVERS GRIDDEFLEC-

WRITE
MONITOR

C V/H TION HV FOCUSADDRESS7NO. 1 POWER MOTOR DRIVEW COORD SYNC GEN SYNCLOAD 2 PWR ANODESUPPLY REC/MONITOR CONVERTER1SCAN DISABLE SUPPIND TEST FILAMENTDRIVER
_N SWITCHDC 2
K1 SCAN
NO. 2

MOTOR B141 CAPTAIN'S WX INDICATOR (P44)NO. 1 SYSTEM
26V DC NO. 2 DB175115V ACSYSTEM 30
NO. 2 ZERO AND AC 24J226V DC INCREMENTAL 115V AC TO
CJMONITORS R/T 1J1 (SHT 3)J3C2 10TO/FROM W/G B3 J4 CONTROL BUS 2SCAN ELEV I CONTROL BUS 1 11SWITCH J1JOINT JOINT B4(SHT 3) TO ON/OFF 2 12

FROMD2 C
B6 5 SAME ASR/T 1 DATA BUS 1 R/TNO. 2 FROM CONT G DATA BUS 2D3 INDICATOR(SHT 3) NO. 1 6SYSTEM DB143B C11 PNL NO. 1

(SHT 3) 7FLAT _PELEVATION DRIVE E13 (SHT 3)

PLATE Q_ E14 G3 1
DATA BUS 2ANTENNA BBZERO AND G2 2SWITCHED DB143B MONITOR RETURN W/G SW

INCREMENTAL HH D11 (SHT 3)115V AC NO. 2 SAME AS D8 E DC_I 20INTLKC826V DC MONITORSFROM R/T ELEVPOWER R/T 28V DC
A E10
TO CONT PNL LTS 22
_Z K2

ELEVATION MONITOR K
AC

NO. 2 DISABLE NO. 1 D7SUPPLY SWITCHED
B E11
PNL 5V AC

SWITCH SYS 2 27
C D6L
E12 (SHT 3) (33-11-00)SAME W 28V DC TO CONT.
MOTOR 26V DC AS D C10 C6 M B175 F/O WX INDICATOR (P45)

SCAN MONITOR INTLK PWR PNL (SHT 3)SYS 1DRIVER NO. 2 E C11 C3 115V AC

F TO ANTENNA DB109B
C12 J2SYSTEMELEV _A SYS 2NO. 1 C F11 45 HMOTOR _ SCAN DRIVE PITCH PITCH

SC13
26V DC HF12 46L TC14
_ X K14 62 X

DD FROM CONT B7
Y J14 63 Y ROLLD CONTROL BUS 0 ROLLN PNL SYS 2 B8

Z H14 64 Z (SHT 3)
B140 WX R/T 2 (E5 WAVEGUIDE B109 INS NO. 2 (E2-6)TO/FROM CONTB143 ANTENNA ASSEMBLY EQUIP CTR - AFT SHELF)

PNL (SHT 3) Weather Radar System Schematic Figure 3 (Sheet 4)
E39749
EFFECTIVITY
CONFIG 4799 Page 19/20AF 183,184
34-43-00

Sep 25/94

 (d)  
The 28-volt dc interlock power from R/T No. 2 goes through the normally open contacts of the control panel SYS transfer switch to energize the waveguide switch coil. The waveguide switch connects the antenna waveguide to R/T No. 2. In addition, the 28-volt W/G switch interlock signal arms R/T No. 2 as discussed for R/T No. 1 above.

 (e)  
Energizing relay K1 also sends 115-volt ac switched power to the cooling blower located on the R/T mount. A blower test switch on the R/T mount tests blower operation when the R/T is removed.

 (f)  
The captain's and first officer's indicator PWR switch in on supplies 115-volt ac operating power to their respective indicator low voltage power supplies and blowers.

 (9)  AF 183, 184; Electrical Power and Power Control Circuits (Fig. 3, Sheets 3 and 4)
 (a)  
The weather radar indicators and receiver/transmitters receive single-phase, 400-Hz, 115-volt ac power through circuit breakers on circuit breaker panel P7. The antenna receives 115-volt ac power from the R/T selected.

 (b)  
Closing the R/T No. 1 circuit breaker sends a 28-volt dc interlock power signal from R/T No. 1 keep alive power supply our pin J1-C6 to the control panel pin k and the SYS transfer switch. With the SYS transit switch in position 1 the 28-volt dc signal goes through the waveguide switch to R/T No. 1 pin J1-D8 and to switch S1 which controls the operation of R/T relay K1. A ground goes from the SYS switch in the control panel on pin V to R/T No. 1 pin J1-B6 the to the R/T switch S1. The 28-volt dc signal switches S1 and sends the ground on pin J1-B6 to energize the K1 relay in either R/T No. 1 or R/T N0. 2. Energized R/T No. 1 relay K1 sends 28-volt dc operating power to the control panel and 115-volt ac switched power to antenna system No. 1. When R/T No. 1 is selected on the control panel, a discrete ground is sent to R/T No. 2 to prevent transmission.

 (c)  
When the No. 2 weather radar system is selected with the SYS transfer switch, the 28-volt dc interlock power to the R/T No. 1 is removed and a ground is applied to prevent transmission.

 (d)  
The 28-volt dc interlock power from R/T No. 2 goes through the system 2 contacts of the control panel SYS transfer switch to waveguide pin E which energizes the waveguide switch coil. The waveguide switch connects the antenna waveguide to R/T No. 2. In addition, the 28-volt W/G switch interlock signal arms R/T No. 2 as discussed for R/T No. 1 above.
　
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