A7™ Service Manual 046-006272-00 5 - 47
Repair and Troubleshooting Pneumatic Circuit System Problems
FIGURE 5-37
20. Release the negative pressure ball. If the negative pressure ball is fully expanded within 30
seconds, it indicates that the gas mixer leaks.
21. For N2O branch, disconnect tube 49 and pull out its end connecting the needle valve
(disconnect tube 51 for AIR branch and tube 137 for O2 branch).
22. Occlude the pulled-out tube end on the needle valve by using 3126-06-00 tube plug.
23. For N2O branch, disconnect tube 27, pull out its end connecting the needle valve, and connect
the gas inlet of the negative pressure ball to the gas outlet of the needle valve through “3106-
06-00 adapter connector” and PU tube (6X200) (disconnect tube 28 for AIR branch and tube 73
for O2 branch). Compress the negative pressure ball to bleed the gas inside.
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