TM 11-6625-214-12
Table 4-4. Organizational Preventive maintenance Checks and Services for AN/URM-52(*)
M-Monthly
Total Time Required: 1.0
Sequence
ITEM TO BE INSPECTED
Work time
number
PROCEDURIE
(T/H
1
EXTERIOR SURFACES
Clean the signal generator and the transit case.
01
2
PUBLICATIONS
a. Check DA Pam 310-4 to determine If maintenance m anuals are complete and
in usable condition,
0.1
without missing pages.
b. Check DA Pam 310-4 to determine that all changes pertinent to the equipment
are on hand.
c Check DA Pam 310-7 to determine If new applicable MWO's have been
published. Check to
determine that all URGENT MWO's have been applied to the equipment and all
NORMAL
MWO's have bean scheduled.
3
FUSES
Check to determine that fuses are of the correct rating and are not defective
(para 411)
4
KNOBS, DIALS, AND SWITCHES
Check for proper mechanical action by setting each control to each of Its possible
settings.
01
Knobs that require frequent tightening should have setscrews replaced
5
METER
Check for sticking pointer movement and broken glass.
6
LAMPS
Cheek for burned-out pilot lamps
7
PLUCKOUT ITEMS
Inspect seating of tubes; do not remove, rock, or twist them. Use only a direct
pressure to insure
01
tube Is fully seated.
8
RESISTORS AND CAPACITORS
Inspect resistors and capacitors for cracks blisterin g, or other detrimental effects.
01
9
Check for chipping and excessive wear
01
10
JACKS AND CONNECTORS
Check for snug fit and good contact.
11
TERMINALS
Inspect screw-type terminals of transformers, fixed capacitors, resistors, chokes,
potentiometers
01
and rheostats for corrosion, dirt, and loose contacts
12
TERMINAL BLOCKS
Inspect terminal blocks for loose connections, cracks, and breaks.
01
13
AIR FILTER
Inspect air filter for dirt and grease. Clean or replace f necessary.
0.1
14
Check to determine that all items comprising an operable equipment and all
running spares and
01
accessory items are on hand. All shortages must be on valid requisitions.
Section III. TROUBLESHOOTING
Note on the repair tag how the equipment performed at
4-6.
Visual inspection.
time of failure.
a. When the AN/URM-52(*) fails to perform
b.
Unless otherwise specifically stated, the
properly, visually check all the items listed below. Do not
controls should be adjusted as follows:
check the fuses with the ac power on.
Control
Setting
(1) Setting of switches and controls.
MOD SELECTOR switch
INT
(2) Equipment power source.
XOI/PPS MUX 10
SYNC SELECTOR switch
(3) Burned-out fuses (usually indicates
PULSE RATE control
100
some other fault). Be sure that the proper fuses are used.
PULSE DELAY control
Extreme counter
(4) Cables, connections, and insulation.
clockwise position
PULSE WIDTH control
10
4-7.
Troubleshooting AN/URM-S2(*)
a. If visual inspection does not locate trouble,
OUTPUT ATTEN control
0 dbm
con- sult trouble-shooting table 4-5. If malfunction is still
not located, higher category troubleshooting Is required.
4-3