Appendix A: Maintenance
Model 2657A High Power System SourceMeter® Instrument Reference Manual
A-2
2657A-901-01 Rev. B/December 2012
To prevent injury, death, or instrument damage, use only the correct fuse type (see table).
Perform the following steps to replace the line fuse:
1. Power off the instrument and remove the line cord.
2. The fuse drawer (item 1 in the figure) is located below the AC receptacle. A small tab is located
on the top of the fuse drawer (item 2). Using a thin-bladed knife or a screwdriver, pry this tab
away from the AC receptacle.
3. Slide the fuse drawer out to gain access to the fuse (the fuse drawer does not pull completely out
of the power module).
4. Snap the fuse out of the drawer and replace it with the same type (the fuse is specified in the
table below).
5. Push the fuse drawer back into the module.
If the power line fuse continues to blow, a circuit malfunction exists and must be corrected. Return the
instrument to Keithley Instruments for repair.
Line fuse
Line voltage
Rating
Keithley Instruments
part number
100 V - 240 V
5 A, 250 V, FAST-
ACTING CARTRIDGE
FUSE, 5 x 20 mm
FU-154-5
Front panel tests
There are two front panel tests: one to test the functionality of the front panel keys and one to test the
display.
In the following procedures, once highlighted, menu items are selected by pressing the
ENTER
key.
Alternatively, menu items can be selected by pressing the navigation wheel
.
WARNING
NOTE
Summary of Contents for 2657A
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