Model 1280 Series _________________________________________________________________________Troubleshooting
8 - 1
Section 8 - Troubleshooting
8.1 Troubleshooting Guide
The following is a guide to troubleshooting the system. If a
contaminated area of the cabinet must be entered to determine
and/or resolve the source of a particular problem,
the cabinet
must first be decontaminated
.
Servicing of the unit must be performed by quali-
fied service personnel.
Problem 1:
Airflow in the cabinet work area and through the
exhaust filter is inadequate.
Possible causes:
• Exhaust filter is blocked by laboratory materials or the pro-
tective shipping cover.
• If the biological safety cabinet is connected to an exhaust
system, there may be inadequate exhaust suction or back
pressure in the duct system. The system must be rebalanced
to handle the correct air volume. A biological safety officer
should be consulted.
• Low voltage is being applied to the blower motor.
• Blower motor or speed control is defective.
• Supply HEPA filter and Exhaust HEPA filter may be
loaded. Decontaminate the unit and replace both HEPA fil-
ters.
Before any maintenance work is performed in
the biological safety cabinet, the unit must first
be decontaminated.
Problem 2:
Ultra violet light malfunction
Possible causes:
• Make sure the sliding window is within approximately 3/8”
of the fully closed position.
• Check lamp pins and socket ends for contact.
• U.V. lamp is defective.
• Starter is defective for the UV light.
• Check UV interlock switch adjustment.
Problem 3:
Fluorescent light malfunction
Possible causes:
• Check lamp pins and socket ends for contact.
• Lamp is defective.
Problem 4:
Loud screeching noise
Possible causes:
• Bearings are bad in the motor blower assembly.
• Blower wheel is rubbing against the housing.
