Chapter Nine: Maintenance General Information
111
Chapter Nine: Maintenance
General Information
If the 651 instrument fails to operate properly upon receipt, check for shipping damages, and
check the cables for continuity. Any damage should be reported to the carrier and MKS
Instruments immediately. If it is necessary to return the unit to MKS, obtain an ERA number
(Equipment Return Authorization Number) from a MKS Service Center before shipping. Please
refer to the inside back cover of this manual for a list of MKS Calibration and Service Centers.
Periodically, check for wear on the cables and inspect the enclosure for visible signs of damage.
How To Replace Fuses
1. Select the proper fuses.
All units should have two fuses installed to
fuse both sides
of the line.
2. Disconnect the power cord from the 651 instrument.
Warning
To avoid an electrical shock, be sure to disconnect the
power cord
before
proceeding.
3. Insert a small device, for example, a screwdriver, in the fuse holder clip on the right side of
the fuse holder.
Refer to Figure 13, page 112, for the location of the clip.
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