If The Status Indicator Is Red; If The Status Indicator Is Yellow And The Vacuum Pump Is Not Running - Agilent Technologies 1260 Service Manual

6
Troubleshooting and Diagnostics
Hardware Symptoms

If the Status Indicator is Red

Sufficient vacuum is normally built up after the initial start- up and is
maintained by controlling the proportional valve as triggered by the
vacuum sensor.
If the vacuum cannot be reached, the micro vacuum degasser will be
forced into an error state. The error condition can be reset by turning the
micro vacuum degasser off and on again.
The following described failure conditions will appear during the start- up
procedure before the red error LED is turned on:
If the Status Indicator is Yellow and the Vacuum Pump is not
Running
✔
✔
✔
✔
48
Remove the top cover (see
page 55).
Check the operation of the vacuum pump. Disconnect the vacuum tube
from the sensor assembly to the vacuum chamber at the vacuum
chamber (see "Removing and Refitting the Top Cover"
adjust the pressure inside the vacuum chamber to ambient conditions.
Switch the micro vacuum degasser off and on again. The vacuum pump
should start immediately.
Use a test meter to check for + 24 V DC on the connector CN2 of the
control assembly between pin 1 and 2 (see
Parts" on page 66). This voltage is needed to operate the pump. If this
voltage is low, exchange the control assembly (see
Degasser Control Assembly and the Sensor Assembly"
Check the resistance of the motor windings. The windings should have
a 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
page 70).
"Removing and Refitting the Top Cover"
"Overview of Internal
"Exchanging the Vacuum Pump"
1260 Infinity Micro Degasser Service Manual
on
on page 55) to
"Exchanging the
on page 76).
on