Line fuse replacement
A fuse on the 2601B-PULSE rear panel protects the power line input of the instrument. Follow the below
instructions to replace the fuse. You do not need to return your instrument for service if the fuse is damaged.
Disconnect the line cord at the rear panel and remove all test leads connected to the
instrument before replacing a line fuse. Failure to do so could expose the operator to
hazardous voltages that could result in personal injury or death.
Figure 3: Fuse replacement
To prevent injury, death, or instrument damage, use only the correct fuse type (see table).
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 on the top of the
fuse drawer (item 2). Use a thin-bladed knife or a screwdriver to 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 a fuse continues to become damaged, a circuit malfunction exists and must be corrected. Return the
instrument to Keithley Instruments for repair.
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