TM 11-5840-208-30-1
the power off and check the cable connections between the control unit and the pedestal for improper mating.
d.
Check for operation of the system blowers. There are three blowers to be checked.
(1)
Check the blowers in the receiver-transmitter cabinet. To accomplish this, hold a piece of paper to the
intake vents at the rear of the cabinet. If inrushing air draws the paper against the vent, the blower is
operating. This must be done on both the left and right sections of the vent to insure operation of both
the main blower and the magnetron blower.
(2)
The control-indicator blower is operating if air is being discharged at the exhaust vent on the right side of
the cabinet.
e.
While waiting for the 5-minute delay relay to close, perform the following checks and adjustments:
(1)
After 30 seconds, rotate the TEST METER SELECTOR switch on the control-power supply and on the
control-monitor through the positions listed in (a) and (b) below. The meter should read as follows:
(a) At the control-power supply:
Switch
Meter
Typical
Actual
reading
value
position
scale
440 V X100
0-5
4.4
440 volts
220 V X50
0-5
4.4
220 volts
27 V X10
0-5
2.7
27 volts
-220 V X50
0-5
4.4
-220 volts
(b) At the control-monitor:
Switch
Meter
Typical
Actual
reading
value
position
scale
XTAL 1
0-5
2.5
0.5 ma
XTAL 2
0-5
2.5
0.5 ma
+300V X100
0-5
3.0
300 volts
+150V X50
0-5
3.0
150 volts
-300V X100
0-5
3.0
-300 volts
(2)
Operate the AZIMUTH switch to the CW position and then to the CCW position. The antenna should
rotate in a corresponding direction.
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