Status Panel 3A8 Functioning

TM 11-5820-695-35

USE (GHZ) indicator is lighted green and the lower part,

2-83.

Status Panel 3A8 Functioning

14.4 to 15.0, is lighted white. For K-band operation the

colors are reversed. The control signals are generated

Status panel assembly 3A8 (fig. 5-106) contains the

by the waveguide switches (para. 2-80)

main power switch protective fuses and alarm indicators

to monitor waveguide switch position and the CV-

2-84.

Power Supply 3A6 Functioning

3633/GRC-144(V) and R-1467(P)A/GRC-144 operation.

A description of primary power distribution through

Power Supply 3A6 (fig. 5-103) rectifies ac power from

status panel 3A8 and electrical equipment chassis 3A7

transformer 3A7T1 to provide the required dc operating

is provided in paragraph 3-82. The POWER 2 AMP

power for the alarm monitor 3A1, electric frequency

SLO-BLO fuse 3A8F1 protects amplifier-multiplier 3A5

converter 3A2 and amplifier-multiplier 3A5 circuits.

heater 3A5HR1 and POWER 1.5 AMP SLO-BLO fuse

Power supply 3A6 contains +28 Vdc and +100 Vdc

3A8F2 protects transformer 3A7T1 from overload

rectifier and regulator circuits. There are also two

conditions. Each fuse is housed in a fuse holder

thermal switches 3A6S1 and 3A6S2 that protect power

3A8FX1 and 3A8FX2 that contain a neon indicator that

supply 3A6 +28 Vdc and +100 Vdc circuits from damage

illuminates if a fuse is open. Status panel 3A8 AIR

due to excessive temperatures caused by circuit

FLOW indicator is discussed in paragraph 2-82c and 2-

overloading. As described in paragraph 2-81, 120 Vac

87 along with alarm monitor 3AT circuit descriptions. All

power is stepped down by transformer 3A7T1. The

indicators 3A8DS1 through DS13 have one side

outputs from the secondary windings provide the

connected to ground. The other side receives either a

appropriate voltages for the 28 volt 3A6CR5 and

+28 vdc signal (indicator ON) or an open circuit signal

3A6CR6 rectifiers, 100 volt 3A16CR1 through 3A6CR4

(indicator OFF) from the monitored circuit through

rectifiers, +28 V regulator and +100 V regulator boards

3A8J1.

Normal/fault status indicators AIR FLOW,

3A6A1 (fig. 5-104) and 3A6A2 (fig. 5-105). The

TEMP, and ALARM SUMMARY are lighted green for

following secondary transformer 3A7T1 windings listed

normal status and red for fault status. OSC TEMP and

below supply ac power to power supply 3A6 rectifier

FREQUENCY BAND IN USE (GHZ) are operating mode

circuits.

status indicators. OSC TEMP (white) cycles ON/OFF as

the oscillator temperature varies. For C-band operation,

the upper part, 4.4 to 5.0, of FREQUENCY BAND IN

Winding

Voltage

Power Supply 3A6 Rectifiers

3-4

92V RMS

CR1 through CR4

5-7

72V RMS

CR5 and CR6

8-9

14.7V RMS

A2CR1 through A2CR4

10-11

14.7V RMS

A1CR1 through A1CR4

Change 6 2-132