General Maintenance 4
Troubleshooting and Maintenance Manual 77
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 these boards
• Wires and cables between these 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.
Dangerous temperatures
Many parts in the MS operate at, or reach, temperatures high enough to cause
serious burns. These parts include, but are not limited to:
• GC/MS interface
• Analyzer parts
• Vacuum pumps
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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