Class II Biological Safety Cabinets
Problem 9: Electrical socket always OFF
Cause Corrective Action
Connection
Problem
• Is the OUTLET LED Illuminated? If not press the Outlet button at the keypad
membrane in front panel.
• Check voltage coming to the Relay board.
• Locate LS4 (J6 Terminal) circuit and measure AC voltage between Large BLUE
(Neutral) terminal block and the end terminal (with Red cable-COM) on the three
terminal strip (J6).
• If there is voltage to the end terminal (with Red cable-COM), check the central
terminal (Normally Open circuit) to the BLUE (Neutral) terminal block.
• No voltage at the central terminal (Normally Open circuit) indicates a blown fuse or
the circuit is not energized.
• Check Fuse F4 on relay board. See Figure 9-1 below.
• If fuse F4 is blown, replace with F5 fuse.
• If fuse F4 is OK, check the voltage between the BLUE (NEUTRAL) terminal block and
the end terminal (COM) on the LS4 circuit (J6 on relay board).
• Voltage at the end terminal (Normally Closed circuit) with no cable indicates the F4
fuse is good and the circuit is not energized. Make sure the OUTLET LED is on.
• If there is power to the relay and it is energized Check voltage across Connector B pin
1 to 2 and pin 4 to 5.
• If there is power through Connector B pins, remove socket outlets from wall.
• Check incoming power to the plug in the cable to the outlet
• No power indicates a wiring issue. Recheck voltage from Connector B pins.
• Check for loose or faulty connection between the power cord, IEC inlet and
Faulty electrical
socket
• Socket(s) is(are) located inside the work zone.
• Check electrical socket connection.
• If connection is correct but socket has no output, replace electrical socket.
Problem 10: Contaminated Sample/Lab
Cause Corrective Action
Blocked air grille/
Cabinet overloaded
with too many
items
Contaminated samples are normally the result of any of the following:
-Poor Technique of the user or lack of training.
-Samples being contaminated in the incubator or somewhere other than the BSC.
Items to check on the BSC:
• Make sure that the front and back air grilles are not blocked.
• Remove all equipment and other items from the cabinet and surface decontaminate
the cabinet including the area under the work surface.
• Surface decontaminate everything that is returned to the BSC.
• If the contamination problem persists, recertify the cabinet.
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