TABLE 6-1. TROUBLESHOOTING CHART (cent)
Remedy
Probable Cause
Trouble
Faulty E2 voltage controls 1R4,
1AT5, 1AT3 (12, 11, 10, figure
transformer 1T1 (20).
Faulty MODE SELECTOR switch
1S8 (15).
Replace switch.
Faulty HEADING SELECTOR
switch 1AT1 (34).
Replace switch or resistor.
E1 CHECK variable resistor
Faulty E1-E2 CHECK switch 1S3
cannot be adjusted to null NULL
(6, figure 9-12) or El CHECK
INDICATOR when MODE
variable resistor 1R5 (8).
SELECTOR is in MON position.
Replace Monitor.
Faulty Monitor.
Replace switch.
Faulty HEADING SELECTOR
switch 1AT1 (34).
Replace resistor.
Faulty 1R1 resistor.
Perform power test of table 7-2,
Faulty MODE SELECTOR switch
step 1, part III.
1S8 (15).
Replace switch.
Faulty FV SELECT switch 1S10
(31).
Replace switch or resistor.
E2 CHECK cannot be adjusted to
Faulty E1-E2 CHECK switch 1S3
null NULL INDICATOR when
(6, figure 9-12) or E2 CHECK
MODE SELECTOR is in MON
variable resistor 1R6 (8).
position.
Replace switch.
Faulty HEADING SELECTOR
switch 1AT1 (34).
Perform power test of table 7-2,
Faulty MODE SELECTOR switch
step 1, part III.
1S8 (15).
Perform MISAL circuit test of
With Turntable and HEADING
Faulty MISAL polarity switch
table 7-3, step I.
SELECTOR at 0, synchro head-
ing does not change when MISAL
is set in.
Faulty MISAL MINUTES switch
1AT6 (14).
Perform ∆180 circuit test of table
Faulty ∆180polarity switch 1S4
With Turntable at 0 and HEADING
SELECTOR at 180, synchro
heading does not change when
Faulty ∆180MINUTES switch
∆180 is set in.
1AT8 (4).
Replace switch.
Faulty HEADING SELECTOR
switch 1AT1 (34).
6-4
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