TM 11-6625-2709-40
2-8.
Troubleshooting
Chart -Continued
Probable trouble
Proper
for improper
Correction
Procedure
Step
indication
indication
m. If TO-FROM meter
m. TO-FROM meter
m. Refer to figure 4-12 and
2 (Cont
does not indicate 500
should indicate
make resistance checks
25.0 microamperes to
500 25.0 micro-
on S6, M3, and associ-
the left of zero, resis-
amperes to the
ated circuits.
left of zero.
tor R8, switch S6, or
TO-FROM meter M3
is defective.
Either a break in the cir-
If a break in the circuit is
TEST lamp on aid
Set the power
3
present between P2-t and
box should light in
cuit is present between
switch on the con-
P5-L, make resistance
P2-t and P5-L, or switch
addition to the lamps
trol unit to TEST.
measurements to find the
S6C in the control unit is
lighted in step 2
break. If no break is pre-
defective.
above.
sent, troubleshoot the con-
trol unit as described in
TM 11-5826-226-34.
Note: 1.0 FREQ
SELECT (MHz) lamps
A and D should re-
main lighted in steps
4 through 22 below.
4
Troubleshoot the control
If either one, or both, of
Set the power
0.1
FREQ
SELECT
unit as described in TM
the lamps do not light, the
Switch on the con-
(MHz) lamps B
kilohertz selector on the
11-5826-226-34.
trol unit to PWR.
and E should
control unit is defective.
Set the megahertz
light.
and kilohertz se-
lectors to 108.05.
a. If a break in the circuit
a. If 0.1 FREQ SELECT
0.1 FREQ SELECT
5
Set the megahertz
is present, make resis-
(MHz) lamp A does not
MHz) lamps A and
and kilohertz se-
tance measurements to
light, either a break in
B should light. 0.01
lectors to 108.10.
find the break. If no
the circuit is present
FREQ
SELECT
break is present,
between P2-f and P5-C,
MHz) lamp B should
troubleshoot the con-
or the kilohertz selec-
light. GS/LOC ON
trol unit as described
lamp should light.
tor in the control unit
in TM 11-5826-226-34.
is defective.
b. Troubleshoot the con-
b. If 0.1 FREQ SELECT
trol unit as described
(MHz) lamp B does not
light, the kilohertz se-
in TM 11-5826-226-34.
lector on the control
unit is defective.
c. If a break in the circuit
c. If GS/LOC ON lamp
does not light, either
is present, make resis-
tance measurements to
a break in the circuit
is present between
find the break. If no
break is present,
P2-k and P5-Y, or the
troubleshoot the con-
kilohertz selector in
trol unit as described
the control unit is
in TM 11-5826-226-34.
defective.
Change
1
2-17
