TM 11-6625-2709-40
2-8. Troubleshooting Chart - Continued
Probable trouble
for improper
Proper
indication
Procedure
Correction
Step
Indication
Same as step 68 above.
Same as step 68 above.
71
1.0 FREQ SELECT (MHz)
Set the megahertz and
kilohertz selectors to
lamps C and E should light.
116.00.
72
Same as step 68 above.
Same as step 68 above.
1.0 FREQ SELECT (MHz)
Set the megahertz and
kilohertz selectors to
lamps D and E should light.
117.00.
a. If either one, or both, of the 1.0
a. Troubleshoot the control unit as
73
1.0 FREQ SELECT (MHz)
Set the megahertz and
FREQ SELECT (MHz) lamps do
lamps A and D should fight.
kilohertz selectors to
described in TM 11-5826-
not light, the megahertz selector in
118.00.
COMM lamp should light.
226-34.
the control unit is defective.
DME DSBL light on test set
should light.
b. If the COMM lamp does not
b. If a break in the circuit is pres-
light, either a break in the circuit is
ent make resistance measure-
present, between P7-Y and P5-S,
ments to find the break. If no
or the megahertz selector in the
break is present, troubleshoot
the control unit as described in
control unit is defective.
TM 11-5836-226-34.
c. If the DME DSBL does not light,
c. Replace DS1.
DS1 is faulty.
NOTE
DME DSBL lamp
on test set should
remain on in steps
74 through 81
below.
The megahertz selector in the control
Troubleshoot the control unit as
74
Set the megahertz and
1.0 FREQ SELECT (MHz)
unit is defective.
described in TM 11-5826-226-34.
kilohertz selectors to
lamps A and E should light.
COMM lamp should light.
119.00.
Same as step 74 above.
Same as step 74 above.
75
Set the megahertz and
1.0 FREQ SELECT (MHz)
lamps B and E should light.
kilohertz selectors to
120.00.
COMM lamp should light.
Same as step 74 above.
Same as step 74 above.
76
1.0 FREQ SELECT (MHz)
Set the megahertz and
kilohertz selectors to
lamps A and B should light.
121.00.
COMM lamp should light.
Same as step 74 above.
Same as step 74 above.
77
Set the megahertz and
1.0 FREQ SELECT (MHz)
kilohertz selectors to
lamps A and C should light.
122.00.
COMM lamp should light.
Same as step 74 above.
Same as step 74 above.
78
Set the megahertz and
1.0 FREQ SELECT (MHz)
lamps B and C should light.
kilohertz selectors to
123.00.
COMM lamp should light.
Same as step 74 above.
Same as step 74 above.
79
Set the megahertz and
1.0 FREQ SELECT (MHz)
kilohertz selectors to
lamps B and D should light.
124.00.
COMM lamp should light.
Same as step 74 above.
Same as step 74 above.
Set the megahertz and
1.0 FREQ SELECT (MHz)
80
kilohertz selectors to
lamps C and D should light.
125.00.
COMM lamp should light.
Same as step 74 above.
Same as step 74 above.
81
Set the megahertz and
1.0 FREQ SELECT (MHz)
kilohertz selectors to
lamps C and E should light.
126.00.
COMM lamp should light.
Replace DS2.
If AIRWAYS lamp does not light,
Disconnect pendant cable
AIRWAYS lamp should
82
DS2 is defective.
light.
plugs P3 and P7. Jumper
P7-P to P7-G.
Refer to figure 4-12 and check cir-
If AIRWAYS lamp does not light, Q1,
AIRWAYS lamp should
Jumper P7-Z to P7-I.
83
R1, or R3 is defective.
cuit comprised of Q1, R1, and R3
light.
to isolate the trouble.
Replace R2.
If AIRWAYS lamp does not light, R2
Place an 18.1 k resis- AIRWAYS lamp should
84
is defective.
light.
tor in series between P7-
P and P7-H.
Replace DS3.
If MIDDLE lamp does not light, DS3
Jumper P7-P to P7-J.
MIDDLE lamp should light.
85
is defective.
If MIDDLE lamp does not light, Q2,
Refer to figure 4-12 and check cir-
Place an 18.1 k resis- MIDDLE lamp should light.
86
cuit comprised of Q2, R4, and R5
R4 or R5 is defective.
tor in series between P7-
to isolate the trouble.
P and P7-K.
Change 1
2-22.5
