Service manual

ELI 250/210__________________________________________________________________________
2-2
Cleaning and Inspecting Techniques
This section contains instructions for periodic cleaning and inspection of the instrument as preventative maintenance
measures. It also contains specific cleaning procedures to be conducted after disassembly. Parts having identical
cleaning procedures are grouped under common headings. No special tools are required.
Interior Cleaning
WARNING
Ventilate work area thoroughly when using solvents. Observe manufacturers warnings on
solvent containers with regard to personnel safety and emergency first aid. Be sure that first
aid equipment is available before using chemicals. Observe all shop safety and fire
precautions.
Magnetic Cleaning
CAUTION
Do not use solvents to clean transformers or inductors. The chemical action of solvents may
remove the varnish from the wire coils, rendering the components useless. The solvent also
neutralizes the adhesive of the cover tape, resulting in eventual tape separation from the
windings.
Clean transformers and inductors with a dry, non-metallic, soft bristle brush.
Printed Circuit Board Cleaning
The printed circuit board assemblies in the ELI 250/210 system contain static sensitive devices. Use special
handling procedures to prevent damage due to ESD.
Clean assembled parts with a vacuum cleaner or low pressure compressed air (30 psi). Take care when cleaning
printed circuit boards that wires or component leads are not bent back and forth in such a manner as to weaken them
and cause them to eventually break.
Dry with low pressure compressed air.