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Maintenance
7-4
7.3
Cover removal
WARNING
Disconnect the instrument from the
power line and other equipment before
replacing the fuse.
1. Turn off the Model 708A Switching System. Disconnect
the instrument from the power line and other equipment.
2. Remove the Model 708A from the rack (if rack
mounted). Place it in a suitable location for disassembly.
3. Remove screws (1) and dress panel (2) from the switch-
ing system (Figure 7-2).
4. Remove screws (3) and top cover (4) from the switching
system.
5. Gently pry off the top cover of the switching system.
Refer to paragraph 7.10 before handling or removing
internal components of the Model 708A Switching
System.
1
2
3
4
Figure 7-2
Screw and dress panel removal
7.4
Fuse/power supply replacement
The line fuse, which is mounted on the power supply, pro-
tects the instrument’s power line input. If the fuse needs to be
replaced, the power supply must be replaced as well. Use the
following procedure to replace the power supply. Also refer
to assembly drawings 708A-050 and 708A-051 at the end of
this section.
WARNING
Disconnect the instrument from the
power line and other equipment before
replacing the power supply.
Procedure
1. Turn off the Model 708A Switching System. Disconnect
the instrument from the power line and other equipment.
2. Remove the instrument’s cover (paragraph 7.3). The
power supply is located under a plastic safety cover.
3. Remove the AC input and DC output connectors from
the power supply.
4. Remove the four mounting screws and lift out the power
supply.
5. Replace the power supply (Keithley part number
PS-66), attach it with four screws, and reconnect the
input and output connectors.
6. Reinstall the cover (paragraph 7.3).
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Содержание 708A
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