Cleaning The Front-Panel Display; Abnormal Display Operation; Removing Ghost Images Or Contrast Irregularities - Keithley 2461 Reference Manual

Appendix A: Maintenance
5. Use the screwdriver to lift the tab from the fuse drawer.
6. Slide the fuse drawer out. The fuse drawer does not pull completely out of the power module.
7. Snap the fuse out of the drawer.
8. Replace the fuse.
9. Push the fuse drawer back into the module.
If the fuse continues to become damaged, a circuit malfunction exists and must be corrected. Return
the instrument to Keithley Instruments for repair.
Lithium battery
The Model 2461 contains a CR2032 cell (LiMnO2) battery. Perchlorate material may require special
handling. See
(http://www.dtsc.ca.gov/hazardouswaste/perchlorate).
This battery is not user-replaceable.
Front-panel display
Do not use sharp metal objects, such as tweezers or screwdrivers, or pointed objects, such as pens
or pencils, to touch the touchscreen. It is strongly recommended that you use only fingers to operate
the instrument. Use of clean-room gloves to operate the touchscreen is supported.

Cleaning the front-panel display

If you need to clean the front-panel LCD touchscreen display, use a soft dry cloth.

Abnormal display operation

If the display area is pushed hard during operation, you may see abnormal display operation. To
restore normal operation, turn the instrument off and then back on.

Removing ghost images or contrast irregularities

If the display has been operating for a long time with the same display patterns, the display patterns
may remain on the screen as ghost images and a slight contrast irregularity may appear. Note that if
this occurs, it does not adversely affect the performance reliability of the display.
To regain normal operation, stop using the front-panel display for some time. You can turn off the
front-panel display while continuing operation using remote commands and the virtual front panel.
To turn off the front-panel display using a SCPI command:
Send the command:
DISPlay:LIGHt:STATe OFF
To turn off the front-panel display using a TSP command:
Send the command:
display.lightstate = display.STATE_LCD_OFF
A-2
http://www.dtsc.ca.gov/hazardouswaste/perchlorate
Model 2461 Interactive SourceMeter® Instrument Reference Manual
2461-901-01 A/November 2015