Any experience to troubleshoot Agilent1100/1200 degasser?

[Anthony_Ng]

I replace a vacuum pump, solenoid, vacuum chanber and sensor one-by-one to a good vacuum degasser. All of them are ok. Do you think there is problem on the control board?

Any experience about the symptom of bad control board?

What I note is that, when I connect a good pump to a good sensor directly, the yellow LED light and after a while red LED light and pump stop.

[Consumer Products Guy]

First I'd change out the vacuum tubing. I've replaced that before to restore operation. Available from Agilent or auto parts store.

[attila01]

Hi Antony,
first of all use the original pr. sensor. Connect the sensor directly to the pump, with the shortest tube. If that parts are OK, it runs 20 secs and stops about 3. If the vacuum reaches the minimum level the amber (yellow) status goes off. If the vacuum level can not achieve the min. level in 8 mins, the amber (yellow) status goes to red.
If the system achieves the 'pump stop' limit in short mode (pump - sensor) check leaks step by step. Pump - solenoid valve - sensor, Then pump-solenoid-chamber-sensor.
If the short pump-sensor mode fails, goes red after 8 minutes, change the pump first, start with 'short' pump-sensor direct connection, and so on...
You can order pump, solenoid valve, tubing kit, chamber, and power supply-controlboard-sensor together in one package.
One more important...if you find a leakage in the chamber (liquid in the vacuum side, wash all tubes with water, then rinse in IPA or ETOH, then dry in vacuum.
I hope this helps.
The Hun.