TABLE 6-1. TROUBLESHOOTING CHART (cont)
Remedy
Trouble
Probable Cause
Perform MISAL circuit test of
Faulty MISAL polarity switch 1S6
During an electrical-manual
table 7-3, step 1.
swing operational check, an N-S
one-cycle error which is maxi-
mum on 0 and 180 degrees is
Faulty MISAL MINUTES switch
observed.
1AT6 (14).
Monitor magnetized.
Perform demagnetization proce-
dure, paragraph 6-8.
Faulty ∆180polarity switch 1S4
Perform ∆180 circuit test of table
During an electrical-manual
(1, figure 9-12).
swing operational check, an N-S
7-3, step 3.
one-cycle error which appears
Faulty ∆180MINUTES switch
maximum at 180 but not at
0 degrees is observed.
1AT8 (4).
Faulty ∆180section of HEADING
Replace switch.
SELECTOR switch 1AT1 (34).
During an electrical-manual
Perform E 1 regulation tests of
E1 voltage regulation not
swing operational check, an E-W
functioning properly.
table 7-2, steps 5 and 6.
one-cycle error appears at 90 and
270 degrees but maximum errors
Faulty HEADING SELECTOR
Replace switch.
appear at 165 and 195 degrees.
switch 1AT1 (34, figure 9-12).
During an electrical-manual
E2 voltage regulation not function-
Perform E2 regulation tests of
swing operational check, a two-
ing properly.
table 7-2, steps 5 and 6.
cycle error is observed.
Faulty HEADING SELECTOR
Replace switch.
switch 1AT1 (34, figure 9-12).
During an electrical-manual
Faulty HEADING SELECTOR
Replace switch.
swing operational check, an error switch 1AT1 (34, figure 9-12).
appears at only two or four
headings.
No sensitivity of Console angle
No excitation to valve assembly
indicator when determining
in Field Tester shield can
control transformer index error
assembly due to:
using Field Tester, although in
normal operation angle indicator
Defective switch S1.
Replace switch.
seems normal.
Defective wiring.
Replace wire as necessary.
Open excitation winding of
Replace valve assembly.
valve assembly.
No magnetic field in Field Tester
shield can assembly due to:
No d-c voltage.
Check E1 voltage setting on
Console.
6-6
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