Section VI
Paragraphs 6-16 to 6-17
TABLE XII. TYPICAL A-C VOLTAGE MEASUREMENTS (Cont)
.
--
AUDIO SELECTOR SETTING
TERMINAL
TEST
1000 ~
9960 FM
150 ~
90 ~
POINT
NO.
30~ VAR
COMPONENT
Z1402
Z1404
V1407
0.42
V1408
1
0.09
0.06
0.03
0.03
7
0.06
V1408
0.87
0.43
0.60
0.43
1
V1507
0.69
15.5
14.2
10.5
10.5
14.8
7
V1508
13.2
13.4
8.2
8.2
V1508
5.4
8.4
8.1
5.4
V1506
0.45
0.75
0.73
0.45
J1408
6-16. TROUBLE SHOOTING THE POWER SUPPLY.
TABLE XIII. DYNAMOTOR TROUBLE SHOOTING
.
(Cont)
6-17. DYNAMOTOR TROUBLE SHOOTING. Troubles
REMEDY
PROBABLE CAUSE
SYMPTOM
in the dynamotor on the audio chassis may be located
by reference to table XIII.
Return to qual-
Shims end loading
No or low
ified overhaul
the bearings.
output .
TABLE XIII. DYNAMOTOR TROUBLE SHOOTING
depot.
(Cont)
SYMPTOM
PROBABLE CAUSE
REMEDY
Return to qual-
Faulty armature.
ified overhaul
Failure to
No voltage or im-
Check source
depot.
start.
proper input voltage. voltage.
Replace
Broken or sticking
Open in input circuit Check and re-
brushes.
brushes.
wiring or power
pair open and
cable.
loose connec-
Lubricate or
Noisy
Dry bearings.
tions in input
replace bear-
operation.
circuit.
ings as neces-
sary.
Worn low voltage
Replace
brushes.
brushes.
Return to qual-
Bent shaft.
ified overhaul
Dirty low voltage
If due to grease
depot.
commutator.
on commutator,
clean with cloth
Return to qual-
High commutator
saturated with
ified overhaul
bar.
gasoline or
depot.
dress the com-
mutator.
Tighten mount-
Dynamotor mountin
ing screws.
not secure.
Open armature
Return dyna-
winding.
motor to qual-
ified overhaul
Lubricate or
Damaged or dry
depot.
Over-
replace bear-
bearings.
ings as neces-
Excessive
Faulty shunt field.
Return to qual-
sary.
speed.
ified overhaul
depot.
Return to qual-
Shims end loading
No or low
ified overhaul
the bearing.
Dirty commutator.
Clean with cloth
depot.
output .
saturated with
gasoline or
dress commu-
Return to qual-
Bent shaft rubbing
tator.
ified overhaul
against housing.
depot.
Low input voltage.
Check input
voltage on
Replace or
Sticking brushes.
meter and ad-
service
just SET LINE
brushes.
TO 21V control
for 21 volts.
