d. Connect 120 Vac 60 Hz power supply to term-
inals 4 and 12 of the control box relay assembly.
Measure voltage at terminals 6 and 10. Voltage
should be 120 Vac (fig. 1-1).
e. Measure dc voltage across relay K6. Voltage
should be above 18 Vdc (fig. 1-1).
3-11. Control Cubicle Wiring Harness.
Rebuild wiring harness if inspection reveals 30 per-
cent or more defective wires. Wiring harness re-
building instructions are described in Chapter 5.
Otherwise replace damaged wires.
3-12. Control Cubicle Reassembly, Testing and
Installation.
a. Reassembly. Refer to Operator and Organi-
zational Maintenance Manual and reassemble the
control cubicle.
b. Testing. Refer to the Operator and Organi-
zational Maintenance Manual (Control cubicle,
s thematic diagram) to test the assembled control
cubicle.
(1) The following control cubicle component
tests are described in paragraphs 3-6 through 3-10
respectively:
Ac Wattmeter
Converter
Ac Ammeter
Frequency meter and transducer
Control box relays
(2) Wiring test.
( a ) Using an ohmmeter, check the wiring
from each-pin of receptacle J1 to the last point of
its connection.
( b ) Where the wiring of two or more pins
of the receptacle can be tested by a switch closure,
close the switch and complete the teat. After com-
pleting the test, return the a switch to its normal
position.
(3) Oil pressure gage test.
( a ) Connect the positive lead of a variable
dc power supply, adjusted for 28.5 Vdc, to pin small
w of receptacle J1.
( b ) Connect the negative lead of the power
supply via a 0-50 ohm 100 watt potentiometer ad-
justed for 15 ohms to pin V or receptacle J1.
( c ) Turn on the power supply and wait 3
minutes.
( d ) After 3 minutes have elapsed, the oil
pressure gage should indicate 60 psi.
( e ) Turn off the power supply and disconnect
the test circuit.
(4) Water Temperature gage test.
( a ) Connect the positive lead of a variable
voltage dc power supply, adjusted for 28.5 Vdc, to
pin small w of receptacle J1.
( b ) Connect the negative lead of the power
supply via a 0-2K ohm S watt potentiometer adjusted
for 917 ohms, to pin W of receptacle J1.
( c ) Turn on the power supply and wait 3
minutes.
( d ) After 3 minutes have elapsed, the water
temperatike gage should indicate 180 degrees F.
( e ) Turn off the power supply and disconnect
the test circuit.
(5) Fuel Level gage test.
( a ) Connect the positive lead of a variable
voltage dc power supply adjusted for 28.5 Vdc, to
pin small w of receptacle J1.
( b ) Connect the negative lead of the power
supply via a 0-50 ohm 100 watt potentiometer adjust-
ed for 15 ohms to pin X of receptacle J1.
( c ) Turn on the prover supply and wait 3
minutes.
( d ) After 3 minutes have elapsed, the fuel
level indicator should indicate one-half tank
( e ) Turn off the power supply and disconnect
the test circuit.
(6) Total Time indicator test.
(8) Connect the positve lead of a variable
voltage dc power supply adjusted for 28.5 Vdc , to
pin small w of receptacle Jl.
( b ) Connect the negative lead of the power
reapply to pin small r of receptacle J1.
( c ) Turn on the power supply.
( d ) Observe the tenths column of the indica-
tors digital read out.
( e ) The indicadicator shall display one-tenth
after six finutes of operation.
(f) Turn off the power supply and remove
the test leads.
3-7
