Introduction 1
5977B Series MSD Operating Manual 21
Important Safety Warnings
There are several important safety notices to always keep in mind when using
the MSD.
Many internal parts of the MSD carry dangerous voltages
If the MSD is connected to a power source, even if the power switch is off,
potentially dangerous voltages exist on:
• The wiring between the MSD power cord and the AC power supply
• The AC power supply itself
• The wiring from the AC power supply to the power switch
With the power switch on, potentially dangerous voltages also exist on:
• All electronics boards in the instrument
• The internal wires and cables connected to these boards
• The wires for any heater (oven, detector, inlet, or valve box)
If one of the primary fuses has failed, the MSD will already be off, but for
safety, switch off the MSD and unplug the power cord. It is not necessary to
allow air into the analyzer chamber.
Electrostatic discharge is a threat to MSD electronics
The printed circuit boards in the MSD can be damaged by electrostatic discharge.
Do not touch any of the boards unless it is absolutely necessary. If you must
handle them, wear a grounded wrist strap, and take other antistatic precautions.
All these parts are shielded by covers. With the covers in place, it should be difficult
to accidentally make contact with dangerous voltages. Unless specifically
instructed to, never remove a cover unless the detector, inlet, or oven are turned off.
If the power cord insulation is frayed or worn, the cord must be replaced. Contact
your Agilent service representative.
Never replace the primary fuses while the MSD is connected to a power source.
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