If Indication
Normal
Circuit or
Indication
Function Tested
Is Abnormal
Procedure
Step
1
MISAL Circuit Test
Part
MINUTES switch is
Check circuit wiring.
ERROR readout
Connect Console and
I
rotated through each
Monitor as in paragraph
shall drive nega-
Check polarity switch
of its series resistors
4-12. d.
tively in incre-
and replace if defective.
to detect an open re-
ments each time
switch is moved,
sister or contact.
El NORM. -REV. switch
to El NORM.
Clean MINUTES switch
with a final read-
contacts.
out of 120 6
A 120-MINUTE
E2 NORM. -REV. switch
ERROR is switched
MINUTES more
into the circuit at full
Replace defective
to E2 NORM.
negative than
rotation of MINUTES
MINUTES switch.
initial recorded
reading in this
switch.
HEADING SELECTOR
to O DEGREE.
step.
MODE SELECTOR to
CAL.
Monitor to a 0-degree
heading.
READOUT SELECT to
FV.
FV SELto 1 or 2.
Null the NULL INDICATOR
with E1 VOLTS and
vernier controls.
MISAL MINUTES switch
to 0.
MISAL polarity switch to
MISAL.
Record initial readout
ERROR.
While observing ERROR
readout, rotate the
MISAL MINUTES switch
clockwise from 0 to 120
MINUTES.
Record final ERROR
indication.
Replace polarity
The negative polarity
ERROR readout
1
MISAL polarity switch to
switch.
switch position is
shall drive to a
-MISAL.
Part
final readout of
checked for good con-
II
tact and action.
120 6 MINUTES
more positive than
initial recorded
reading.
MISAL MINUTES switch
to 0.
7-12
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