Figure 5-7. Master control block assembly.
b. The ON-OFF Indicator Shows ON. A possible cause is that there is no
pressure at the air regulator outlet. Check the system air pressure gauge. It should
indicate 80psi.
(1) If the system pressure is adequate, there is an obstruction between the
regulator and the foot control.
(a) Check for crimped tubing.
(b) Check for plugged barbs.
MD0371
5-12
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