TM 11-6625-586-45
CHAPTER 5
DEPOT MAINTENANCE
Distortion Analyzer Hewlett-Packard Model
5-1. Depot Maintenance Operations
334A
Complete rebuild of the signal generator and/or
FM Deviation Meter Marconi Model TF 791D
its individual components may be accomplished
Generator, Signal AN/USM-44
by depot maintenance facilities when authorized.
G e n e r a t o r , Signal AN/GRM-50
Rebuild action will include all repairs, rebuild,
5-5. Low RF Voltage Range and Accuracy
and replacement operations necessary to make the
Adjustment
equipment suitable for return to DA supply sys-
tem stocks for re-issue to using organizations as
equipment equivalent to new material. Detailed
RF voltage outputs. If an out of tolerance indi-
procedures for accomplishing the repairs and ad-
cation is observed, adjust in accordance with step
justments in the preceding portions of this man-
bq.
ual and such additional repair and rebuild opera-
b. Connect unit under test and test equipment
tions as deemed necessary, will be established by
as shown in figure 5-1A. Set signal generator
controls as follows:
the facility performing the work. Chapter 6 es-
tablishes the requirements that must be met by
BAND SWITCH
B
rebuilt or repaired equipment before it is re-
RF TUNING
30 MHz
Function Switch
MOD OFF
turned to DA supply system stocks.
RF OUTPUT
20, 0-10KUV
IF OUTPUT
OFF
5-2. General Parts Replacement Techniques
NOTE
Parts replacement techniques applicable to depot
maintenance facilities are the same as those ap-
Allow all test equipment, except the RF voltmeter
a minimum 1/2 hour warm-up period before us-
plicable to lower maintenance categories. Refer
i n g . Allow minimum of 5 minutes for RF volt-
meter.
c. Turn LO RF UV dial such that 10KUV is
5-3. Equipment Alignment
under indicator line.
Equipment alignment procedures applicable to
d. Turn LO-HI RF SET TO LINE control
such that RF meter reads at "red line."
depot maintenance facilities are those dictated
e. Read voltage on RF voltmeter and compare
by the equipment available to the depot and are
with table 5-1.
given in the following paragraphs.
f. Turn to LO RF UV dial such that 3KUV
is under indicator line.
5-4. Test Equipment Required for Depot
NOTE
Maintenance
The following test equipment or their equivalents
RF meter will now read above "red line". Reposi-
t i o n LO-HI RF SET TO LINE control such that
are required for depot testing:
meter reads on "red line".
RF Voltmeter AN/URM-145
g. Read voltage on RF voltmeter and compare
Attenuator-Calibrator PRD Model 915B
with table 5-1.
Mixer PRD type UHF-600
h. Turn to LO RF UV dial such that lKUV
Impedance Bridge General Radio Type 1650B
is under indicator line.
Radio Interference Measuring Set AN/URM-
with table 5-1.
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5-1
