TM 11-6625-3145-14
Maintenance: General Information-318/338 Service
CAUTION
To prevent water from getting inside the instrument during external cleaning, use
only enough water to dampen the cloth or swab.
DO NOT use chemical cleaning agents as they may damage the plastics used in the
instrument. In particular, avoid chemicals that contain benzene, toluene, xylene,
acetone, or similar solvents.
INTERIOR CLEANING
To gain access to internal portions of the instrument, refer to Disassembly/lnstallation Procedures later in this section.
Internal cleaning should be done with a dry, low-velocity stream of air. A soft-bristle brush is useful for cleaning around
components, If a liquid must be used for minor internal cleaning, use isopropyl alcohol, denatured ethyl alcohol, or a
solution of 1% mild detergent and 99% de-ionized water.
Should the interior of the instrument require a thorough cleaning, wash according to the following cautionary Cleaning
Guidelines.
CLEANING GUIDELINES
DO NOT wash the front-panel power switch. The power switch must be covered during washing procedures.
Spray-wash dirty parts with a cleaning solution listed under Interior Cleaning, then use de-ionized water to THOROUGHLY
RINSE all parts. IMMEDIATELY DRY all parts with low air pressure.
When washing near unsealed electromechanical components, use as little washing action as possible. This prevents
washing the lubricant out of the components and getting an excess of detergent into the contact areas of the switches.
DETERGENT RESIDUE WILL CAUSE CORROSION, which may degrade instrument performance.
DO NOT use a freon-based spray cleaner for cleaning the circuit boards. Freon will damage aluminum capacitors.
DO NOT use fluorocarbon-based spray cleaners or silicon spray lubricants on switches or switch contacts. These sprays
may damage the circuit board material or plastic parts, and leave a dust-collecting residue. If necessary, NEW
IMPROVED NO NOISE ® may be used as a lubricant.
To prevent damage from electrical arcing, ensure that all circuit boards, switches, and interface connectors are completely
dry. Do this by heating the board or switch in an oven at 75° C (167° F) for 15 minutes before applying power.
INSPECTION
Inspect the instrument for broken connections, frayed wires, poorly seated components, leaking capacitors, damaged
hardware, and heat-damaged components.
Repair any obvious problems. However, take particular care if you find any heat-damaged parts. Overheating usually
indicates other circuit problems. To prevent recurrence of the damage, find and correct the cause of the overheating.
Note that replacement of electrical components may necessitate readjustment of the affected circuitry. Refer to the
Replaceable Electrical Parts section for a list of part and component descriptions.
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Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
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Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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Page 555: ...PIN 058584 ...