TM 55-4920-428-13
SECTION II OPERATIO
N
DESCRIPTION
2-4. Electrical Unit Controls and Indicators.
CONTROL OR INDICATOR
(Fig. 2-2)
Power switch S17
Toggle circuit breaker switch, 7 amperes.
OFF - Disconnects input power (115-volt 60 Hz) from test
set.
ON
-
Connects input power to test set and protects test set
from overload.
LAMP TEST switch/
indicator S11
DVM D1
SYSTEM SELECT switch
S3
CYCLE MOTOR switch/
indicator S12
SOLENOID SHUTOFF switch
indicator S18
ELAPSED TIME meter M3
Momentary pushbutton switch/indicator. When switch is
pressed, all test set indicators come on.
POWER - Comes on when power switch is at ON.
WARNING - Comes on when input power falls below 105-
volt ac.
Ac digital voltmeter. Displays SAS 1, SAS 2, or BITE Feedback
level, as selected by SYSTEM SELECT switch.
3-position rotary switch.
SAS 1 - No. 1 self, cross, or valve voltage, as selected by
LINK TEST switch S9, is selected for display on DVM.
SAS 2 - No. 2 self, cross, or valve voltage, as selected by
LINK TEST switch S7, is selected for display on DVM.
BITE - Self, cross, or dc voltage, as selected by BITE switch,
is selected for display on DVM. Simulated transducer signal
is applied to demodulators selected by BITE switch. Load re-
sistors are substituted for extensible link servo valves.
Push on/push off indicating switch.
Push to latch - ON indicator comes on and 115-volt-ac
cycle motor rotates.
Push to unlatch - OFF indicator comes on and cycle motor
stops.
Push on/push off indicating switch.
Push to latch - OPEN indicator comes on and 115-volt ac is
applied to solenoid in hydraulic unit. When SOLENOID
switch in hydraulic unit is closed, solenoid valve is energized
open.
Push to unlatch - CLOSED indicator comes on and power
circuit to solenoid opens to close solenoid valve.
HOURS up to 999.9 are displayed on four digit wheels. Meter
indicates total time that electrical unit is operated.
2-
3
