TM 9-6625-1753-14
C2
CHAPTER 5
5-8. Cleaning Instructions
MAINTENANCE INSTRUCTIONS
Warning: Deenergize the oscilloscope before cleaning.
a. Wipe all dust from the front panel and cabinet with a clean dry cloth. Wipe all dust from expos ed internal parts of the
oscilloscope. If necessary, dampen the cloth with cleaning compound (6810-281-1985) and then wipe the parts with a clean,
Section I. REPAIR PARTS, TOOLS, AND EQUIPMENT
dry cloth. Use a clean, dry brush to remove dust from control shafts, wiring and other restricted areas.
b. Clean the graticule scale with a clean cloth dampened with water and wipe dry with a clean soft cloth. Be careful not
5-1. General
to rub dirt into the engraved scale divisions.
c. Use technical trichloroethane (OT-620) to clean electrical parts whenever necessary.
Repair parts, tools, and equipment are issued to using personnel for operating and maintaining the oscilloscope. Tools and
equipment should not be used for purposes other than those prescribed, and when not in use, they should be properly stored.
Warning: Trichloroethane is toxic. Avoid breathing fumes and provide adequate ventilation.
5-2. Repair Parts
Table 5-1. Preventive Maintenance Checks and Services
For the repair parts (parts most likely to become defective under normal operating conditions) that are supplied to the using
Interval
organization, refer to TM 9-6625-1753-25P. They are to be replaced by the using organization only if the operations required
to replace these parts are within the scope of the organizational, direct support, and general support maintenance functions.
No.
Item
Monthly
Semi-
Preventive maintenance checks and services
annual
5-3. Common Tools and Equipment
1
Exterior
X
Inspect exposed area for rust, dirt or moisture. Clean or dry as
Standard and commonly used tools and equipment having general application to this materiel are authorized for issue by
required.
tables of allowances and tables of organization and equipment.
2
Switches, knobs, pilot
X
Tighten as required. Inspect for binding or scraping. Check for cut-out
lights, and controls
due to dirty or loose contacts by tapping lightly. Replace, repair, or
clean as required.
Caution: To prevent damage to the equipment, assure that the power is off before inserting plug-in units into, or
3
Handles
X
Hand check for looseness.
removing these units from the main frame.
4
Operation
X
Be alert to any unusual operating condition or performance.
5
Cables,
probes,
X
Clean and inspect for cuts, broken or frayed wiring.
Section II. PREVENTIVE MAINTENANCE
connectors
6
Plug-in runners
X
Inspect the runners for dirt or dust.
5-4. General
7
Plug-in
assembly
X
Check for dirty or bent contact connectors.
a. Preventive maintenance is the systematic care, inspection, and servicing of equipment to maintain it in serviceable
connectors
8
Exterior and interiors
X
Check for cracks, breaks or other damage.
condition, to prevent breakdowns, and to insure maximum operational readiness.
9
Components
X
Check capacitors and resistors for swelling, melted wax, corrosion and
b. Preventive-maintenance services in this section are the responsibility of the using organization. Every organization
equipped with the oscilloscope must thoroughly train its personnel to perform the required preventive-maintenance services.
have authorized personnel replace them.
10
Screws and nuts
X
Inspect all screws and nuts and tighten.
These services consist of monthly, and semiannual services, to be performed primarily by the organizational maintenance
11
Fan
X
Add a small amount of lubricant to the fan motor shaft.
personnel.
5-5. Preventive Maintenance Checks and Services
Section III. TROUBLESHOOTING
Warning: Be extremely careful of high voltages when servicing the oscilloscope. Be especially careful of the
+100-volt and +200-volt supplies. These are even more dangerous than +11, 200-volt (nominal) and -1350-volt
Warning: Deenergize the oscilloscope before performing preventive maintenance.
supplies because they can produce greater current. Turn off the oscilloscope and disconnect the power cord before
removing the oscilloscope from the fiberglass case. When making interior checks or adjustments with the power on,
5-6. Lubrication Instructions
use only one hand and don't grasp the oscilloscope chassis or any grounded object with the free hand.
Lubricate the runner slides every 3 months with a light coating of instrument grease MIL-G-23827. Lubricate the fan motor
Warning: Be extremely careful when handling the cathode-ray tube. Flying glass resulting from tube implosion
shaft every month. This can be accomplished by removing the motor, rubber-stop cup and applying a small amount of
can cause severe injury. When possible, leave the graticule scale in place to protect the tube face.
lubricating oil MIL-L-6085A. There are no other lubrication requirements for the oscilloscope.
5-9. General
5-7. Precautions
Locating the source of troubles on the oscilloscope can, in many instances, be accomplished by observing the cathode-ray
a. Never use steel wool to clean this equipment. Minute particles may lodge in the compartments and cause short
tube screen, while making the various control settings for the different operating modes. Other faults, such as burned
circuits.
resistors and diodes, shorted transformers, and defective switches can be located by sight, smell, hearing, and touch.
b. Never use a damp or wet cloth to clean wiring or electrical connections.
Troubleshooting tables are furnished to aid the using personnel in locating the source of a trouble that can't be found by the
c. Do not use cleaning compound (solvents) to clean electrical contacts or the CRT graticule scale.
5-1
