and marked "System Pressure".
The AMC-20CF System uses a single compressor motor with
a split head. The split head provides pressure on one side and
vacuum on the other. The vacuum side uses venturi boosters
to increase the vacuum. The compressor is controlled by a
pressure sensor located on the tank. The sensor activates the
compressor air pressure whenever the air reservoir needs to
be recharged. The recharge starts when the pressure in the
air reservoir drops to approximately 80 PSI, and it stops when
the reservoir be-comes fully charged at a factory preset of
approximately 110
PSI.
All the handpiece,
curing light, scaler,
and vacuum instru-
ment holders are
air-activated hold-
ers. If the High
Vacuum
Ejector
(HVE) or low volume saliva ejector instruments (Fig. 4) are
removed from their holders (or if they aren't properly seated
in their holders), the compressor will run continuously, even
when the air reservoir and System pressure are fully pressur-
ized. This is because the air from the pressure side of the
compressor is diverted through a valve to a venturi, which
increases the vacuum. When the pressure in the air reservoir
drops to approximately 80 PSI, the air is diverted back to the
reservoir and recharges it until its pressure reaches the 110
PSI preset. If the HVE and saliva ejector instruments are
seated in their holders properly but the compressor fails to
turn off, turn the unit's power switch OFF and check for air
leaks in the System. If the System pressure gauge is showing
pressure, the leaking sound should be detectable. Use your
ear, or place a tube to your ear like a stethoscope, to locate
the source of the leak. If a leak can't be heard from any air
lines or fittings, check the water bottles for tightness and the
condition of their seals.
Air/Water Syringe
Check the 3-Way Air/Water Syringe (Fig. 4) by depressing the
air and water syringe buttons individually then both simulta-
neously for spray. A Syringe Air/Water Flow Adjustment
Block is located under the top Lid, behind the divider wall,
beside the Scaler Module.
GENERAL SERVICE INFORMATION
This service and parts manual offers information and parts
lists not available in the AMC-20CF Operation and
Maintenance Instruction Manual. It will help you better
understand the operation of the AMC-20CF Mobile Dental
System, thereby reducing service time. A Schematic Diagram
Set includes assembly drawings with individual part numbers,
plumbing diagrams, and electrical schematics. The plumbing
and electrical diagrams show all air, water, and wiring com-
ponents as installed in the unit. Individual parts are also list-
ed and referenced to Figures with callouts in the Parts Lists.
A Detachable Parts List is also included. Use the information
in the Parts Lists when ordering replacement parts.
INSPECTION & OPERATION VERIFICATION
To verify that the AMC-20CF unit is functioning properly,
first follow the Setup procedure in the Operation and
Maintenance Manual. The System is designed to operate
from 110V or 220V 50/60Hz power. A manually operated
switch (Fig. 1), located above the
power inlet cord, allows the user to
select the proper voltage. The
System is protected by three sets of
circuit breakers: 20 Amp for 110V,
10 Amp for 220V, and 1 Amp for the
isolated voltage circuits.
Toggle the Bottle Pressure Release
Toggle switch, located on the right-
hand side of the unit (Fig. 3), to the ON position. Toggle the
Air Tank Pressure Toggle switch, located on the bottom-left
rear of the unit, to the ON position. Turn the Main Power
Switch, located on the top-right rear of the unit, to the ON
position. The electric-motor control panel should light up
and the compressor pump should fill the air reservoir and
water bottles. With the compressor pump engaged, the air
reservoir should pressurize to a factory preset of approx-
imately 110 PSI (7.58 bar) and the System should pressurize
to a preset of 80 PSI (5.5 bar). The 80 PSI system pressure is
regulated by the regulator/filter (Fig. 2), which is located
under the top lid,
near the right rear
side. The System
pressure is indicat-
ed on the circular
pressure
gauge,
which is also locat-
ed under the top lid
Page 1
Figure 1
Use Tool To
Toggle Switch
Figure 2
RAISE KNOB
THEN ROTATE
TO ADJUST PRESSURE
Figure 4
SYRINGE
SALIVA
EJECTOR
HIGH VACUUM
(HVE)
Figure 3
COOLANT AIR TOGGLE
COOLANT AIR CONTROL VALVE
FLUSH TOGGLE
BOTTLE PRESSURE
RELEASE TOGGLE
BOTTLE SELECTOR TOGGLE
COOLANT
FOR SCALER
COOLANT FOR
AIR HANDPC #2
COOLANT FOR
AIR HANDPC #1
COOLANT FOR
ELECTRIC HANDPC