General Maintenance 6
Before Starting
Operation Manual 107
Tools, spare parts, and supplies
Some of the required tools, spare parts, and supplies are
included in the GC shipping kit, MS shipping kit, or MS tool kit.
You must supply others yourself. Each maintenance procedure
includes a list of the materials required for that procedure.
High voltage precautions
Whenever the MS is plugged in, even if the power switch is off,
potentially dangerous voltage (120 VAC or 200/240 VAC) exists
on the wiring and fuses between where the power cord enters
the instrument and the power switch.
When the power switch is on, potentially dangerous voltages
exist on:
• Electronic circuit boards
• Toroidal transformer
• Wires and cables between the boards
• Wires and cables between the boards and the connectors on
the back panel of the MS
• Some connectors on the back panel (for example, the foreline
power receptacle)
Normally, all of these parts are shielded by safety covers. As
long as the safety covers are in place, it should be difficult to
accidentally make contact with dangerous voltages.
Some procedures in this chapter require access to the inside of
the MS while the power switch is on. Do not remove any of the
electronics safety covers in any of these procedures. To reduce
the risk of electric shock, follow the procedures carefully.
WARNING
Perform no maintenance with the MS turned on or plugged into its
power source unless you are instructed to do so by one of the
procedures in this chapter.
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