Table 3-1. Controls and Functions (cont)

TM 11-5820-917-13

Table 3-1.

Controls and Functions - Continued

Control or

Fig.

ref.

indicator

Function

If the lamp remains lighted for five seconds after initiation

12.

RCVR

of test, indicates malfunction in synthesizer or receiver

indicator (red)

circuits (internal fault) or malfunction of one or more

power supplies.

When lighted, indicates receiver, synthesizer, and

RCVR

13.

power supplies, are fully operational. (Test may take

indicator (green)

up to five seconds to complete.)

Two lamps indicate standby battery condition. Lamps are

BATT

14.

indicator (green)

activated by circuitry that measures battery box terminal

voltage.

BATT

For the non-rechargeable battery supply (P/N 6025-1008) ,

15.

a test is performed with AC line power either on or off,

indicator (red)

battery switch (31) on, and TEST switch (11) pressed.

For the rechargeable battery supply (P/N 6025-1018) , the

AC line power must be off to conduct an accurate test.

However, if the rechargeable battery supply is in a low

charge condition, turning off AC line power can cause

loss of synchronization. If operating in synchronization

with a transmitter, this test should be made with AC line

power on. In this case for the rechargeable battery

supply, the green BATT lamp should always light unless

the supply is fully discharged or defective in which case

the red /green or red lamps will light. (Refer to para-

graphs 5-15 and 5-16 for test description.) For the non-

rechargeable supply, the following indications apply:

Green ON only = Batteries good (voltage greater than

23V) .

Red and green ON together = Batteries weak but still

operational - will need replacing soon. (Voltage

between 18 and 23 volts) .

Red ON only = Battery condition unacceptable (voltage

less than 19 volts) ; indicates very weak or dead

batteries, or battery switch (13) is off.

Red and green both OFF = This condition occurs only

when the AC line power is off and the battery voltage

is less than 14 volts indicating that the battery switch

is off or the batteries are totally dead.

3-4