A-Dec 3420 Operation And Maintenance Instructions - page 23
Basic Troubleshooting
Given proper care, your Pac I will provide years
of reliable service. In the event that something
does go wrong with the unit, this troubleshoot-
ing section tells what can be done in the opera-
tory before removing the unit for repair.
This detail is not intended to isolated every
problem that could arise. It is designed so you
can quickly identify the problems that can be
repaired without special training or equipment.
If the procedures given here do not identify and
correct the problem, much more detailed
instructions are given in the sections covering
the individual components of your Pac I.
Neither Handpiece Works (No Air or Water)
1. Does the syringe work?
Yes: Check for pinched or crimped foot
control tubing. If the tubing is okay, refer to
Foot Control III Valve Troubleshooting
section on page 25.
No: Proceed to Step 2.
2. Is the supply air (compressor or bottled gas sys-
tem) turned on and functioning?
Yes: Proceed to Step 3.
No: Connect the supply air tubing and
re-test the unit. If this did not correct the
problem, consult the documentation that
came with your compressor or bottled gas
system.
3. Is the supply air tubing properly connected?
Yes: Refer to the Air Filter/Regulator Assembly
section.
No: Connect the supply air tubing and
re-test the unit.
No Coolant Water From Either Handpiece
1. Does the syringe work?
Yes: Proceed with Step 2.
No: Verify that there is water in the
self-contained water bottle.
2. Is the wet/dry toggle on the foot control in the
On position (toward the blue dot)?
Yes: Proceed to Step 3.
No: Move the toggle to the On position (toward
the blue dot) and re-test the unit.
3. Are the coolant water flow controls open?
Yes: Proceed to Step 4.
No: Set the coolant water controls as
specified in Routine Adjustments. Then, re-
test the unit.
4. Does the handpiece coolant air work?
Yes: Refer to the Century II Control Blocks
section.
No: Refer to the Signal Relay Valve section.
Insufficient Drive Air Pressure
1. Does the problem affect both handpieces?
Yes: Proceed to Step 2.
No: Refer to the drive air pressure
adjustment procedures in
Routine Adjustments.
2. Check the system air pressure gauge. Does it
show a pressure of at least 70 psi (483 kPa)?
Yes: Proceed to Step 3.
No: Refer to the Air Filter/Regulator Assembly
section.
3. Watch the system air pressure gauge while press-
ing the syringe right-hand (air) button. Does the
pressure drop by more than 15 psi (103 kPa)?
Yes: Remove and inspect the air filter
according to the Clogged Filter Element
instructions in Air Filter/Regulator section
on page 20.
No: Refer to the Foot Control II Valve section.
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