Pneumatic Circuit System Problems Repair and Troubleshooting
5 - 42 046-006272-00 A7â„¢ Service Manual
5.3.3.1 Leak Test of the O2 Flush Button Assembly
Perform a leak test of the O2 flush button assembly by using the following tools:
• Negative pressure ball (quantity:1)
• 3106-06-00 adapter connector (quantity:1)
• PU tube (6X100) (quantity:1)
Test procedures:
1. Turn off the pipeline gas supplies and bleed the residual pressure through O2 flushing.
2. Remove the work surface. Pull out No.52 PU tube which connects the O2 flush button assembly
to the ACGO assembly. Disconnect at the ACGO end.
3. Connect the inlet of the negative pressure ball to PU No.52 through 3106-06-00 adapter
connector and then flatten the negative pressure ball to remove the gas inside.
4. Release the negative pressure ball as shown below. If the negative pressure ball is fully
expanded within 30 seconds, it indicates that the O2 flush button assembly is damaged.
FIGURE 5-30
The gas supplies
cannot be turned off
after the machine is
turned off.
The seal inside the system switch
assembly is damaged.
Replace the system switch.
The machine cannot
be powered on after
turned on.
The contact switch is ineffective.
Replace the contact switch of the
system switch assembly.
The flowmeter float
indicates inaccurate
value or remains
unmoved.
The total float rotameter is damaged. Replace the total float rotameter.
The knob of the flow
regulator gets loose.
The flow regulator is damaged. Replace the flow regulator.
Failure description Possible cause Recommended action
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