Figure 5-6. Handpiece holdback system.
a. All the Handpieces Run While in Their Holders. A possible cause is that
the holdback filter is clogged. Use the following procedures to isolate the actual cause
of this malfunction.
(1) Remove and inspect the holdback filter. The filter can most easily be
removed using the system's internal air pressure.
(a) Turn the system off.
(b) Remove the cap over the filter.
Cup your hand over the filter opening.
(d) Turn the system back on momentarily to eject the filter out of its
seat. Then, inspect the filter.
If you do not need to replace the filter.
(a) Check for a loose connection.
(b) Check leakage between the holdback outlet of the master block
and the filter inlet of the air bleed manifold.
If the filter is damp or discolored, replace it.