FAULT FINDING AND REPAIR
20509 Issue 7 Jan 2018 4-23
Vacuum Switch Check
The vacuum switch is set to detect a pressure drop of 8 to 10 inches of
mercury (2.76 to 3.45 kilogrammes per sq cm) when the pump draws on an
empty ink container.
To check the vacuum switch the printer must be switched on. Remove the
cabinet cover.
(1) Set the Pump Inhibit switch to position 0.
(2) Depressurise the ink circuit.
(3) Close the print head valve.
(4) Remove the QCD from the ink container.
(5) Disconnect the feed tube connection from the QCD.
(6) Fit the vacuum gauge to the feed pipe.
(7) Set the Pump Inhibit switch to 1 and allow the pump to run.
(8) Check the vacuum gauge reading when the pump stops. This should
be between 8 to 10 inches of mercury (2.76 to 3.45 kilogrammes per
sq cm).
(9) If the vacuum reading is correct, set the pump inhibit switch to
position
O and refit the feed tube to the QCD. If the vacuum reading
is incorrect, see below.
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