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To Replace the Primary Fuses
Materials needed
• Fuse, T12.5A, 250 V (2110-1398) – 2 required
• Screwdriver, flat-blade (8730-0002)
The most likely cause of failure of the primary fuses is a problem with the
foreline pump. If the primary fuses in your MSD fail, check the foreline pump.
Procedure
1
Never replace the primary fuses while the MSD is connected to a power source.
WARNING
If you are using hydrogen as a GC carrier gas, a power failure may allow it to
WARNING
accumulate in the analyzer chamber. In that case, further precautions are required.
See
2
3
4
5
5975/5977 Series MSD Operation Manual
Vent the MSD and unplug the power cord from the electrical outlet.
If one of the primary fuses has failed, the MSD will already be off, but for
safety you should switch off the MSD and unplug the power cord. It is not
necessary to allow air into the analyzer chamber.
"Hydrogen Safety"
on page 18.
Turn one of the fuse holders
it pops out. The fuse holders are spring loaded.
Remove the old fuse from the fuse holder.
Install a new fuse in the fuse holder.
Reinstall the fuse holder.
(Figure 2
on page 28) counterclockwise until
1
Introduction
27
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