20
Service\Repair Formech FM660
Auto-Levelling system - continued
Adjustment may be carried out by slightly bending the sensor mounting plate or the reflector plate;
certain machines are fitted with an adjustable bracket, which allows for fine trimming of the sensor. The
sensor has two small adjusting screws that alter sensitivity and range. These have been set at the
factory and are unlikely to have moved. Only adjust these if you cannot make the sensor work properly
by any other means.
If no LEDS are visible at any time then the sensor may have lost its power connection or become faulty.
The Auto-Level may be working properly but blows the plastic up higher than the top-frame level. If this
is the case adjust the sensor mounting plate slightly downward.
Test the machine by placing a narrow strip of plastic across the top-frame at right angles to the sensor
approx. midway between sensor and reflector. Clamp the strip in the usual way. Push the plastic down
until the sensor operates.
Vacuum
Warning: never oil any part of the vacuum pump. It is designed to run dry and could be severely
damaged by lubrication.
The vacuum circuit requires very little maintenance. The inlet filter is mounted on the rear external panel
for easy access. Unclip the top cover of the filter box. The paper cartridge filter will prevent small
particles and dust from entering the vacuum pump. This filter should be inspected periodically and
blown out is dirty or replaced if in poor condition. Do not run the machine without this filter.
Worn or damaged seals around the perimeter of the table may cause loss of vacuum. These are
classed as a consumable part and require replacement after some time. To replace seals follow the
procedure on page 21 .
Other causes of vacuum loss are loose or damaged flexible hose from table to metal pipe (at back of
machine) blocked filters or build up of contamination in the vacuum or tank valves. The valves should
be dismantled and cleaned with paraffin or diesel fuel. Be sure to remove all traces of the solvent
used before re-assembling.Lubricants or other liquid may cause irreparable damage to the pump if
introduced into the vacuum circuit.
Vacuum Pump Clinica version (only)
The diaphragm pump fitted will cope with contaminants that dry vane pump cannot and hence the
warnings stated in the standard FM660 user manual relating to dry vane pumps do not apply.
Vacuum filtration -
There are two filtration systems fitted to the FM660 Clinica to reduce
contaminated air getting to the diaphragm pump fitted.
Table filter -
In the table there is a pit with a filter mounted in the centre. This allows particulate
to fall to the bottom of the pit and not enter the vacuum system. The filter is a fibre cartridge type
designed to reduce plaster particulate and other solid matter entering the vacuum system. The
filter will require cleaning depending upon usage and the amount of wet plaster use during
moulding.
Remove the top cover by rotating anti-clockwise. Wash the filter in clean running water until
clean. Dry and refit. If there is a significant amount of plaster in the pit remove the filter cartridge
holder using the tool provided and clean excessive amounts of plaster from the pit.
Water trap filter-
This is mounted on the side or the back of the machine. Drain off excessive
water using the tap on the base. The internal filter may also require cleaning in the same way as
the table filter. Twist the bowl to remove. Ensure the rubber seal is fitted correctly. Apply a small
amount of lubricant to the seal if required to ease fitting and ensure a good vacuum seal.
