Agilent Technologies 7890A Troubleshooting Manual page 62

4
GC Not Ready Symptoms
Oven Temperature Never Cools Down/Cools Very Slowly
WA R N I N G
62
If the oven does not cool down or cools down very slowly:
The exhaust coming from the back of the GC is very hot. Keep
hands and face away from the exhaust vent.
• Check oven flapper operation.
1 Decrease oven temperature by at least 20 degrees.
2 Verify that the oven flaps in the back of the GC are
open. Listen to verify that the fan is operating. The
figure below illustrates the location of the two oven
flaps.
If the flaps are not operating smoothly, contact Agilent
for service.
If using cryo cooling:
• Check for sufficient cryo coolant.
• Check if operating limits have been exceeded.
Troubleshooting