General Maintenance 4
Troubleshooting and Maintenance Manual 121
To replace the primary fuses
Materials needed
• Fuse, 8 A, time-delay slow blow, (2110-0969) – 2 required
• Fuse, 12.5 A, time-delay slow blow, (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 MS fail, check the foreline pump.
Procedure
1 Vent the MS (See the Agilent 7000 Series Triple Quad GC/MS Operation
Manual) and unplug the power cord from the electrical outlet.
If one of the primary fuses has failed, the MS will already be off, but for
safety you should switch off the MS and unplug the power cord. It is not
necessary to allow air into the analyzer chamber.
2 The fuse holders are on the back panel. Turn one of the fuse holders
counterclockwise until it pops out. The fuse holders are spring loaded.
3 Examine the fuse. If it is blown, remove the old fuse from the fuse holder.
4 Install a new fuse in the fuse holder. Each holder is marked with the
correct fuse value.
5 Reinstall the fuse holder.
6 Repeat for the other three fuses.
Never replace the primary fuses while the MS is connected to a power source.
If you are using hydrogen as a GC carrier gas, a power failure may allow it to
accumulate in the analyzer chamber. In that case, further precautions are required.
See “Hydrogen Safety” .
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