TM 11-6625-214-12
CHAPTER 4
OPERATOR'S AND ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Section I. TOOLS AND EQUIPMENT
a.
Lint-free cleaning cloth.
4-1.
Special Tools and Test Equipment
b.
Cleaning compound (NSN 7930539 -9542).
Refer to Appendix C, Maintenance Allocation for tools
c.
Soft-bristled brush.
and equipment to be used at operator's and organiza-
d.
Fine sandpaper (No. 000).
tional maintenance levels. No special tools or test
e.
Paint.
equipment are required.
f.
Electrical insulation tape.
4-2.
Materials Required
The following materials are required for operator's and
organizational maintenance:
Section II. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
operation has ceased. Stop operation immediately if a
4-3.
General
deficiency is noted during operation, which would
To insure that Signal Generator AN/URM52(*) is always
damage the equipment. Record all deficiencies, to-
ready for operation, it must be inspected systematically
gether with the corrective action taken, in accordance
so that defects may be discovered and corrected before
with TM 38-750.
they result in serious damage or failure. The necessary
preventive maintenance checks and services to be
4-5.
Operational Checks
performed are listed in tables 4-2, 4-3, and 4-4. The
item numbers indicate the sequence of minimum
The operational checks, table 4-1, provide a good indi-
inspection requirements.
cation of the operational capability of the equipment. The
DBM/POWER SET meter on the front panel will serve as
an indicator for this procedure. It is assumed that the
4-4.
Defects
cables have been connected for inputs and outputs and
Defects discovered during operation of the unit will be
sufficient warmup time has been allowed.
noted for future correction to be made as soon as
Table 4-1. Operational Check Procedures
Controls/indicators
Function
1.
Turn power ON-OFF switch to ON.
1.
POWER indicator lights, blower starts and HE ATER
indicator is extinguished.
2.
Turn signal frequency control to desired frequency. If used,
external synchronization or modulation equipment should be
turned on.
3.
Set MOD SELECTOR switch to OFF
4.
After approximately 30 seconds. adjust ZERO SET control. 4.
DBM/POWER SET meter needle s exactly over ZERO
SET line on meter.
5.
Set MOD SELECTOR switch to CW.
5.
DBM/POWER SET meter needle should deflect from
ZERO SET position after approximately 2 minutes.
6.
Adjust POWER SET control for 0 D BM
6.
DBM/POWER SET meter indicates 0 DBM (red line at
center of scale).
7.
Set MOD SELECTOR swath to position for type of operation
desired
4-1
