b. One Handpiece Runs While in Its Holder. There are multiple possible
causes for this malfunction. Use the following procedures to isolate the actual cause.
Verify that the handpiece is in the correct holder.
(a) If it is in the correct holder and is still running, go to (2) below.
(b) If it isn't in the correct holder, move it to the correct one.
Verify that the restricter pin is clean and installed correctly.
(a) Remove and clean the restricter pin associated with the faulty
(b) If this solves the problem, no further action is required.
If the handpiece continues to run, proceed to (3) below.
Verify that there is no loose connection or leaky tubing.
(a) Check for loose connections or leakage between the air bleed
manifold, the control block, and the tilt valve.
(b) Use soapy water to detect a slight seepage.
Repair the leaks and tighten loose connections.
(d) If none can be found, proceed to (4) below.
Verify that there are no defective tilt valves.
(a) Use hemostats to clamp off the holdback tubing to the tilt valve.
(b) If the handpiece stops running, replace the tilt valve.
If the handpiece continues to run, proceed to (5) below.
Verify that the restricter barb is not clogged.
(a) Pull the tilt valve out of the handpiece holder.
(b) Manually tilt the system.
Check for air flow around the tilt valve stem using soapy water, if