Which of the following procedures would you use to isolate the malfunction of all
the handpieces running while in their holders?
a. Remove, clean, and reinstall the restricter pin.
b. Check for leakage between the holdback outlet of the master block and the
filter inlet of the air bleed manifold.
Replace the diaphragm on the control block and all actuator mechanisms in
the handpiece holders.
d. Using hemostats, clamp off the holdback tubing and replace all tilt valves.
The dental operating unit will not come on, and the ON-OFF indicator shows OFF.
Which of the following procedures do you use to isolate the malfunction?
a. Verify you have turned on the compressor and fully opened the manual shut-
b. Listen for a "puff" of air from each handpiece holder when you remove the
Check for an obstruction between the regulator and the foot control.
d. Check for a pinched pilot air tube between the pre-regulator and the utility
The bowl rinse does not shut off automatically. Which of the following procedures
do you use to troubleshoot the malfunction?
a. Test the master ON-OFF valve.
b. Test for improper adjustment of the bowl rinse time control.
Test the pre-regulator to ensure that there is sufficient air pressure in the
d. Test the handpiece holdback system to verify there is sufficient water in the
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