17-2 Routine Maintenance Model 6485 Instruction Manual
Introduction
The information in this section deals with routine type maintenance that can be performed
by the operator and includes procedures for setting the line voltage, replacing the line fuse,
and running the front panel tests.
Setting line voltage and replacing line fuse
WARNING Disconnect the line cord at the rear panel, and remove all test cables
connected to the instrument before replacing the line fuse.
The power line fuse is located in the power module next to the AC power receptacle
(Figure 17-1). If the line voltage must be changed, or if the line fuse requires replacement,
perform the following steps:
1. Place the tip of a flat-blade screwdriver into the power module by the fuse holder
assembly (Figure 17-1). Gently push in and to the left. Release pressure on the
assembly and its internal spring will push it out of the power module.
2. Remove the fuse and replace it with the type listed in Table 17-1.
CAUTION For continued protection against fire or instrument damage, replace
the fuse only with the type and rating listed. If the instrument repeat-
edly blows fuses, it will require servicing.
3. If configuring the instrument for a different line voltage, remove the line voltage
selector from the assembly, and rotate it to the proper position. When the selector is
installed into the fuse holder assembly, the correct line voltage appears inverted in
the window.
4. Install the fuse holder assembly into the power module by pushing it in until it
locks in place.
Table 17-1
Line fuse ratings
Line Voltage Rating Keithley Part No.
100/120V 0.63A, 250V, 5 × 20mm,
slow blow
FU-106-.630
220/240V 0.315A, 250V, 5 × 20mm,
slow-blow
FU-106-.315
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