If The Status Indicator Is Red; If The Status Indicator Is Yellow And The Vacuum Pump Is Not Running - Agilent Technologies 1260 Infinity User 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
✔
✔
✔
✔
42
Remove the top cover (see
page 49).
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"
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 Overview of Internal Parts in the Service
Manual). This voltage is needed to operate the pump. If this voltage is low,
exchange the control assembly (Please contact your Agilent service
representative).
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 (Please contact your Agilent service representative).
"Removing and Refitting the Top Cover"
on page 49) to adjust the
1260 Infinity Micro Degasser User Manual
on