If The Status Indicator Is Yellow And The Vacuum Pump Is Not Running - Agilent Technologies 1200 Series Reference Manual

3
Troubleshooting

If the Status Indicator is Yellow and the Vacuum Pump is not Running

• Remove the top cover (see
• Check the operation of the vacuum pump. Disconnect the vacuum tube
As long as there is sufficient vacuum in the chamber the pump will not be turned ON until
N O T E
triggered by the vacuum sensor.
• Use a test meter to check for + 24 V DC on the connector CN2 of the control
• Check the resistance of the motor windings. The windings should have a
40
page 49).
from the sensor assembly to the vacuum chamber at the vacuum chamber
(see "Overview of Internal Parts"
the vacuum chamber to ambient conditions. Switch the vacuum degasser
OFF and ON again. The vacuum pump should start immediately.
assembly between pin 1 and 2 ( see
page 53). This voltage is needed to operate the pump. If this voltage is low,
exchange the control assembly (see
Assembly and the Sensor Assembly"
resistance in the kOhm range (use a test meter to check resistance between
red and blue, blue and black, black and red wires from connector CN2 to
the pump). If the windings are broken or shortened replace the vacuum
pump (see "Exchanging the Vacuum Pump"
"Removing and Refitting the Top Cover"
on page 53) to adjust the pressure inside
"Overview of Internal Parts"
"Exchanging the Degasser Control
on page 60).
on page 57).
1200 Series VD Reference Manual
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