h. Cleaning. Spillage of any liquid on the table can cause a malfunction,
particularly if it finds its way into the interior. This is especially so with liquids which
leave a solid residue after they dry. It is important to promptly remove spills with a soft
cloth dampened in warm water. Regular cleaning can also be accomplished with a soft
cloth, warm water, and a mild detergent.
Turn the power off when cleaning near electrical wiring.
i. Lubrication. All bearings and bearing raceways should be lubricated every
six months using a light grade of machine oil (equivalent to WD-40). Check the oil level
in the tilt drive and the table-top longitudinal-drive-gear reducers annually. If the level is
low, or if there is any sign of leaking, add gear oil equivalent to Shell Valvata No. J-78.
j. The Tilt-Control Mercury Switches Adjustment. The table has four
mercury switches to prevent table tilt when there is a danger of damage to the table. All
four mercury switches are easily adjusted by twisting their position in a clamp until they
make contact at the desired angle. Two mercury switches are located at the foot-end of
the table, attached at the rear of the table-tilt printed circuit board (PCB). Both of these
switches protect the table top from damage.
(1) The switch farthest from the center of the table prevents table tilt from
the horizontal to head-end up, when the table top is extended towards the head end.
This switch protects the table top from hitting the ceiling of the shelter when the top is
extended toward the head end, and the table is tilted. Adjust this switch to stop table tilt
when the angle of 34 degrees with the horizontal is reached, unless the table top is in
the "center" position.
(2) The other switch attached to the table-tilt PCB protects the table top
from hitting the floor. The switch should stop the table from tilting when the table top is
extended toward the foot end, and the table is tilted head end up. Adjust this switch to
stop table tilt when an angle of 20 degrees with the horizontal is reached, unless the
table top is either in the "center" position, or extended toward the head end.
(3) Inside the table body, at the head end, is a terminal strip for most of the
table wiring. Attached to this terminal strip are two additional mercury switches. Both of
these switches protect the image intensifier system from hitting the ceiling during table
tilt. Both switches work in conjunction with the microswitch on the inside bottom of the
table body. This switch is activated by the rear counterweight as it moves from
head-end to foot-end to counter-balance the spot film device. Therefore, it indirectly
represents the longitudinal position of the spot-film device and image intensifier.