HP Designjet H-Series and HP Scitex FB950 Printer - Troubleshooting vacuum issues

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b. If the vacuum level is less than 5.25 at the end of the pump cycle, the regulator is set too
low. Turn the regulator adjustment screw (see Figures 19 and 20) clockwise 1/8 of a turn.
Repeat steps 2 and 3 as necessary until the vacuum is 5.25 or greater.
3.1.3 Run automated tests to look for leaks
This section pressurizes each color channel (printhead or pair of printheads by color) one at a time
and monitors how long it takes the vacuum to recover. At the conclusion of the test, a table may be
viewed that shows the recovery times for each color in seconds.
If any one of the colors has a recovery time outside the expected limit, the control panel will indicate
the suspected color. A nominal recovery time is 0.8 seconds.
 A longer recovery time on a single color indicates that the affected color channel is not working
as efficiently as expected, i.e., there is probably a leak. This test can be used to help confirm a
diagnosis of a leaking reservoir as described in section 2.2.2
 A longer recovery time on all colors indicates a dirty restrictor, as described in section 2.3.