75
Fig. 37.
The electrode assembly
Replacing the contact pieces
The contact blocks and pins should be replace when damaged. When
you have pulled out the applicator arm and electrode assembly unit,
lay it down on a table and pull out the contact blocks. Replace the
blocks and fit the eccentric levers into place. It might help to move the
lever a little back and forth until it slips into place.
When you replace one contact pin, always replace the other.
Replacing the separation bed cover
The separation bed cover should be replaced if the surface has been
damaged by burns or deep scratches.
Remove the damaged cover by lifting one of the edges up with a
scalpel and peeling the cover off. If there is any glue left on the
cooling plate, remove it by moistening a piece of cloth in an adhesive
solvent, e.g. terpentine, or ligroin, and tuck it down into the recess.
The cloth must be drip-free, solvent might otherwise dissolve the
insulation below the separation bed. Rub gently or leave it on for
about one hour to dissolve the old adhesive.
Wipe away the old adhesive, and clean the bed thoroughly; the new
gel bed cover must lie perfectly flat against the bed.
The spare separation bed cover is self-adhesive. Peel back the paper
backing along the anode (+) side about 2-3 cm. Put this end against
the rear edge in the recess and fold it down carefully. Press along this
piece with your thumb to ensure good contact with the bed. Peel back
the paper backing another 2-3 cm, and press along this piece with
your thumb. Be careful not to trap air bubbles between the bed and
the bed cover. (If air bubbles are present you will have to try again with
a new bed cover.) Continue peeling back the paper backing and
smoothing out the bed cover until the recession is covered.
7. Maintenance and trouble shooting
